Sony TRINITRON 17VC User manual

- 1-
TRINITRON®COLOR COMPUTER DISPLAY
OPERATION MANUAL
TROUBLESHOOTING MANUAL
CIRCUIT DESCRIPTION
D Board (Power Supply Section) ............... 2
D Board (Deflection Section) .................... 11
A Board ................................................... 21
U Board ................................................... 24
GENERAL TROUBLESHOOTING ................ 26
PARTS LEVEL BOARD REPAIR ................. 37
17VC CHASSIS
TABLE OF CONTENTS
9-978-878-02
REVISED

- 2 -
CIRCUIT DESCRIPTION
D BOARD POWER SUPPLY SECTION
Power Supply Electrical Circuit
The power supply is located on the D Board. It has three modes of operation that are controlled by a microprocessor. The
topology is a discontinuous mode flyback converter with photocoupler feedback for regulating the secondary voltages.
Circuit operation and troubleshooting are explained in the following sections:
Operation Modes Secondary Circuitry
AC Input Protection Circuits
Degauss Circuit Troubleshooting
Primary Circuitry USB/Audio Po er Circuit
Operation Modes
The power supply has four modes of operation off active off suspend/standby and active on. These modes are
related to power savings and are indicated by the front panel LED. Additional indications are failure diagnostics and aging
mode. The table below lists operation mode condition and LED status.
Mode Syncs Condition LED
Off N/A Power Switch Off Off
Active Off No H and/or V Low Power, Heater Off Amber
Active On H and V Present Phase Locked, Normal Operation Green
ailure 1 N/A HV ailure Amber 0.5s<-->Off 0.5s
ailure 2 N/A H Stop, V Stop, S Cap ailure Amber 1.5s<-->Off 0.5s
ailure 3 N/A ABL ailure Amber 0.5s<-->Off 1.5s
Aging/Self Test No H and V Aging Raster or Test Pattern Amber 0.5s<-->Off 0.5s
Green 0.5s<-->Off 0.5s
Amber 0.5s<-->Off 0.5s
Except for power switch off all modes of operation are controlled by the microprocessor located on the D Board. The
failure modes are detected by the microprocessor and the power supply is forced into active off mode. These functions
are discussed later (Deflection).
With the AC cord attached to the monitor and connected to an AC source the monitor will be off until the power switch is
turned on. When the power switch is turned on the power supply starts and is in active off mode. The next step is active
on mode. The active off power saving mode is activated by the microprocessor based upon the absence of either H or V
sync. If H and/or V sync signals are not present the power supply is set to active off mode.
Power supply operation control signals are "Remote Sw" "Power Sw" and "PFC Sw". During active off mode Remote Sw
and Power Sw are digital low and PFC Sw is digital high. To enter active on mode the microprocessor sets PFC Sw to
digital low then 300mS later Remote Sw and Power Sw are set to digital high.
Output Of
f
Active Of
f
A
ctive On
180V (B+) 0V +13V +179V
80V 0V +6V +79V
+15V 0V +1V +15V
-15V 0V -1V -15V
+12V 0V 0V +12V
5V 0V 0V +5V
Heater 0V 0V +6.3V
STBY 5V 0V +5V +5V

- 3 -
1
2
1 2
3 4
1
2
3
1
2
3
4
C604
VA601
C643
F601
C605
C660
CN600
C631
SG601
TH601
Q601
RY601
D601
D602
CN602CN601
LF602
R604
TH600
R600
0.47
250V
4700p
250V
5A
250V
0.22
275V
4700p
250V
3P
4.5
220VRMS
:POS
DTC143ESA-TP
RELAY DRV.
D4S60L
AC RECT.
1SS119-25TD
2P4P
:LFT
680k
1/2W
:RC
3.9
3.84A
1
10W
DEGAUSS
12V
DGC2
NC
DGC1
THP600
THP600A
NC
N
L
NC
1. AC I put Sectio
The AC input section provides EMI filtering input protection surge limiting and CRT degauss operation.
EMI Filter
The EMI filter comprises CN600 (inlet with filter) X-capacitors C604 and C605 Y-capacitors C660 and C643 and the
line filter transformer LF602. Input protection is provided by F601and VA601; surge current limiting by thermistor
TH600 and resistor R600. Degauss is explained in the next section.
Degauss Circuit
The degauss circuit is used to demagnetize the CRT. After power on the microprocessor located on the D Board sets the
degauss signal to digital high and Q601 turns on relay RY601. This allows AC current into the degaussing coil through
posistor TH601. The current heats up the posistor and the resistance increases this dampens the current in the degauss
coil to nearly zero. Duration time is approximately 5-6 seconds and the microprocessor then shuts off RY601 which
disconnects the degauss coil from the AC line. This operation should sufficiently demagnetize the CRT.
2. Primary Circuitry Sectio
IC601
The heart of the primary section is the TEA1504/N2 power supply controller IC601. The following describes the functions
of each pin.
Pin 1  Vin: This is a MOSFET drain connection internal to IC601 which is connected directly to the DC mains voltage rail.
The startup current source derives power from the DC mains via the Vin pin. It supplies current to charge the Vaux (IC
supply) capacitors C616 C617 and C681 and also provides current to the IC601 control circuitry.
Pin 2  HVS: High voltage safety spacer pin is a no connection.
Pin 3  NC: Connected to primary side DC mains return.
Pin 4  Driver: Outputs the pulse width modulated gate drive for switching transistor Q602. Maximum duty cycle is set
internally at 80%.
AC Input and Degauss

- 4 -
Pin 5  Isense: Provides cycle by cycle over current protection by turning off pin 4 driver output when Q602 current
exceeds the current limit corresponding to 500mV at pin 5. This pin typically provides 425nS of leading edge blanking time.
The threshold voltage for switch over to low frequency (low power) operation is sensed by pin 5. When the voltage sensed
at pin 5 is below 165mV IC601 transitions from operating at high frequency (56.5KHz) to low frequency (23.5KHz).
Pin 6  Vaux: IC601 supply pin. An internal current source from IC601 charges the Vaux capacitors C616 C617 and C681
for startup. Once the Vaux capacitors are charged to the startup voltage level (11V) then IC601 starts switching pin 4 driver
output. The Vaux is also supplied by an auxiliary winding from T601 on the primary side once the secondary output voltages
attain their nominal operating voltage values. Pin 6 also provides under voltage lockout detection (8V) and over voltage
protection (14.7V).
Pin 7  DS: Provides the power supply for the driver output (pin 4).
Pin 8  Iref: Controls IC601 internal bias currents which determines the pulse width modulated switching frequencies.
High frequency is 56.5KHz during active on mode. Low frequency is 23.5KHz during suspend/standby mode.
Pin 9  V trl: Feedback voltage for duty cycle control.
Pin 10  NC: No connection.
Pin 11  Gnd: Connected to primary side DC mains return.
Pin 12  NC: No connection.
Pin 13  Dem: Guarantees discontinuous conduction mode operation for the power supply. Verifies that T601 is demagne-
tized by not activating the next gate drive pulse until the primary side auxiliary winding of T601 is lower than the threshold
level of 65mV as detected at pin 13.
Pin 14  OOB: On/Off/Burst mode input signal. A voltage greater than 2.5V enables IC601.
Operation
The power supply is a discontinuous-mode flyback converter with photocoupler feedback for regulating the secondary
voltages. The PWM controls the pulse width of the gate drive.
When AC is applied to the power supply and IC601 pin 14 is greater than 2.5V start up current is supplied though IC601 pin
1 to IC601 pin 6. Startup voltage is approximately 11V. After start up the voltage to pin 6 and pin 7 of IC601 is supplied
through D620 connected to T601 pin 1. The first mode of operation is active off mode. The output drive pulse frequency
will be in burst mode operation.
When the power supply enters active on mode the switching frequency will be 56.5KHz. The Vaux level will be approxi-
mately 12.3 volts. OVP threshold is 14.7 volts and UVLO is 8.0 volts. Therefore if the Vaux voltage is not correct the
power supply will not operate properly.
Feedback from the secondary side comes through IC603 and IC604 which is connected to IC601 pin 9. (See diagram on
page 5.)
3. Seco dary Circuitry Sectio
The secondary section consists of the following circuits: Rectifier diodes and filters for all output voltages +5/12 volt
regulators +5 standby regulator heater voltage regulator voltage feedback circuit active off mode feedback and protec-
tion circuits. This section will describe each circuit and its function.
Secondary Rectifiers
The secondary rectifiers supply the following voltages: 180V (B+) for deflection and video 80V for video ±15V for
deflection and regulators 6.3V for heater regulator and +5V standby regulator.

- 5 -
I
OG
1 2 3 4 5
4
6
7
9 10
11
5
12
13
15
16
17
18
14 2
1
S
1
23
1
2
3
4
5
6
7 89
1011121314
1
2
4
3
R613
D609
D606
D607
D608
D611
R625
C619
C620
D618
D620
R640
C647
C603
L602
D603
C611
C633
C634
C615
D612
D605
D617
R602
C608
C622
D622
R611
R617
R626
R647
R607
C612
C624
C616
C621
R627
R615
R616
D625
C656
R605
JW613
C632
T601
C618
JR019
S602
L604
L606
D610
D619
D614
C650
C665
D623
C617
C637
C630
C625
C614
R650
R608
R619R656
R635
R654
R614
R624
R618
R642
R609
R648
R628
R620
R606
R693
R603
R643
D613
R667
R655
C663
R622
C682
R636
R660
R697
C601
C681
C641
C613
D616
D638
R621
R698
C610
R612
R623
R610
Q604
IC604
IC602
IC601
IC603
IC607
Q602
D621
F601
Q603
VA603
R649
R657
220
100
100V
3300
16V
22
25V
1000
25V
100p
500V
47
250V
470p
500V
MTZJ-T-77-12
UF4007G23
UF4007G23
FMC-26UA
UF4007G23
FMN-G12S
FMN-G12S
UDZ-TE-17-13
JW(7.5)
4.7M
1/2W
4.7M
1/2W
0.47
1/2W
1
:FPRD
0.068
250V
2.2k
1/2W
0.1
:PT
100
FMN-G12S
MTZJ-T-77-12
1SS119-25TD
1SS119-25TD
22
25V
2200
25V
1.8k
:RC
0.47
1W
:RS
1.5k
2W
:RS
22k
3W
:RS
0.39
1W
:RS
1.5k
2W
:RS
D1NS6-TA2
RGP10DG23
220
16V
PG106R
SRT
NEW
100
150k
:RN
120k
:RN
470
47p
2kV
100
3W
4.7
50V
270p
2kV
680p
:CHIP
0.01
:CHIP
0.022
:CHIP
0.0022
:CHIP
1.0
10V
1000
25V
0.1
:CHIP
4700p
:CHIP
6800p
:CHIP
0.1
25V
:CHIP
0
:CHIP
T149G
0:CHIP
JW(7.5)
470k
:RN-CP
22k
:CHIP
3.9k
:RN-CP
22
:CHIP
680k
:CHIP
1.0M
:CHIP
100
:CHIP
220
:RN-CP
33k
:RN-CP
22
:CHIP
22
:RN-CP
2.2k
:CHIP
9.1k
:RN-CP
47k
1W
390
:RN-CP
82k
:RN-CP
10k
5.6k
:RN-CP
47k
1W
1.2
1W
:RS
47
10V
100
16V
75k
:CHIP
56k
:CHIP
0.47
25V
F:CHIP
MTZJ-18
MTZJ-T-77-4.7
MTZJ-T-77-4.7
MTZJ-T-77-18
330
400V
22
1/4W
33
1k
:RN-CP
2SC3311A
PROT
AS431LAN
ERROR AMP
A00AST-V5
HEATER REG.
TEA1504-N2
SW REG.
CONTROL
TLP621D4-Y
PHOTOCOUPLER
RCC CONTROL
A05T
5V REG.
2SK2843
SW REG.
OUT
1SS119-25TD
DTC114EKA
HEATER
SW
2.2k
:RN-CP
PWR SWPWR SW
15V
180V
-15V
80V
STY5V
155V-3
6.3V
3
1
21
54
OO
DEM
NC
GND
NC
VCTRL
IREF
VIN
HVS
NC
DRIVER
ISENSE
VAUX
DS
GND
VCC
CTL
OUT
VADJ
A
HEATSINK
TO Q602
TO HEATER
A
+5/12 Volt Regulator
IC605 is the +12V regulator and IC608 is the +5V regulator. The output voltages are supplied to the microprocessor
deflection and video circuits. The +15V line provides the input voltage for +12V regulator; the +12V line provides the input
voltage for +5V regulator. During active off mode the +12V regulator is disabled via Remote Sw and subsequently the 5V
regulator is disabled.
+5V Standby Circuit
IC607 is the standby 5V regulator. In the active on mode the input to the regulator is supplied from T601 winding 14-13.
During the active off mode the regulator input is supplied from T601 winding 10-13 via D612 and D613. Typical input
voltages to the regulator are active on mode: 9.5V; active off mode: 11.5V.
Heater Voltage Regulator
Heater filament voltage is supplied by T601 winding 14-13 and is regulated by IC602 to 6.3V during active on mode. IC602
output is turned on and off by the Power Sw control line at pin 1 CTL. The output is off during active off mode.
Feedback Circuit
The feedback circuit is divided into two sections. One is for active on mode; the other for active off mode. The follow-
ing two sections explains the theory and operation.
Active On Mode Feedback
Shunt regulator IC604 regulates the B+ line to 179.2V by sinking current through the opto coupler 1C603 to ground. The

- 6 -
Feedback Circuits
reference voltage at IC604 pin 1 determines the sink current into pin 3. The reference voltage is set to 2.5 volts by
resistor divider R608 R650 R648 and R609. Since the B+ is connected to the resistor divider any change in B+ voltage
is detected at the reference terminal. The shunt regulator will either increase or decrease the current into pin 3 in order
to decrease or increase the B+ voltage respectively and try to maintain the reference voltage to 2.50 volts. IC603 biases
it's phototransistor accordingly and drives IC601 pin 9 (Vctrl) which changes the duty cycle at IC601 pin 4 (driver) to
regulate the B+ voltage at 179.2V.
Active Off Mode Feedback
Power Sw control line is low (heater off) during active off mode and respectively Q603 is off. Voltage pulses from T601 pin
10 flow through C620 R636 and R660 triggering the gate of thyristor D613. D613 turns on effectively shorting the B+ rail
to the standby 5V regulator input; current flows from T601 pin 10 through D612 and D613 to the standby 5V regulator input.
When the standby 5V regulator input is increased to approximately 12.7V it forward biases zener diode D605 turning on
Q604 and sinks current through IC603 to ground. The standby 5V input supplies this current to IC603 pin 1. IC603 biases it's
phototransistor and drives current through D609 into IC601 pin 14 (OOB) triggering burst mode operation. IC601 pin 4
(driver) is pulled low turning off switching transistor Q602. T601 pin 1 (auxiliary winding) feedback pulses are discontin-
ued and IC601 pin 6 (Vaux) decreases to 8V. IC601 internal current source then charges pin 6 (Vaux) to the startup voltage
level (11V) which starts switching pin 4 driver output. The feedback cycle is then repeated. The burst repetition rate is
approximately every 110mS and when IC601 pin 4 is switching its frequency is 23.5KHz.
I
OG
1 2 3 4 5
4
6
7
9 10
11
5
12
13
15
16
17
18
14 2
1
S
1
23
1
2
3
4
5
6
7 89
1011121314
1
2
4
3
R613
D609
D606
D607
D608
D611
R625
C619
C620
D618
D620
R640
C647
C603
L602
D603
C611
C633
C634
C615
D612
D605
D617
R602
C608
C622
D622
R611
R617
R626
R647
R607
C612
C624
C616
C621
R627
R615
R616
D625
C656
R605
JW613
C632
T601
C618
JR019
S602
L604
L606
D610
D619
D614
C650
C665
D623
C617
C637
C630
C625
C614
R650
R608
R619R656
R635
R654
R614
R624
R618
R642
R609
R648
R628
R620
R606
R693
R603
R643
D613
R667
R655
C663
R622
C682
R636
R660
R697
C601
C681
C641
C613
D616
D638
R621
R698
C610
R612
R623
R610
Q604
IC604
IC602
IC601
IC603
IC607
Q602
D621
F601
Q603
VA603
R649
R657
220
100
100V
3300
16V
22
25V
1000
25V
100p
500V
47
250V
470p
500V
MTZJ-T-77-12
UF4007G23
UF4007G23
FMC-26UA
UF4007G23
FMN-G12S
FMN-G12S
UDZ-TE-17-13
JW(7.5)
4.7M
1/2W
4.7M
1/2W
0.47
1/2W
1
:FPRD
0.068
250V
2.2k
1/2W
0.1
:PT
100
FMN-G12S
MTZJ-T-77-12
1SS119-25TD
1SS119-25TD
22
25V
2200
25V
1.8k
:RC
0.47
1W
:RS
1.5k
2W
:RS
22k
3W
:RS
0.39
1W
:RS
1.5k
2W
:RS
D1NS6-TA2
RGP10DG23
220
16V
PG106R
SRT
NEW
100
150k
:RN
120k
:RN
470
47p
2kV
100
3W
4.7
50V
270p
2kV
680p
:CHIP
0.01
:CHIP
0.022
:CHIP
0.0022
:CHIP
1.0
10V
1000
25V
0.1
:CHIP
4700p
:CHIP
6800p
:CHIP
0.1
25V
:CHIP
0
:CHIP
T149G
0:CHIP
JW(7.5)
470k
:RN-CP
22k
:CHIP
3.9k
:RN-CP
22
:CHIP
680k
:CHIP
1.0M
:CHIP
100
:CHIP
220
:RN-CP
33k
:RN-CP
22
:CHIP
22
:RN-CP
2.2k
:CHIP
9.1k
:RN-CP
47k
1W
390
:RN-CP
82k
:RN-CP
10k
5.6k
:RN-CP
47k
1W
1.2
1W
:RS
47
10V
100
16V
75k
:CHIP
56k
:CHIP
0.47
25V
F:CHIP
MTZJ-18
MTZJ-T-77-4.7
MTZJ-T-77-4.7
MTZJ-T-77-18
330
400V
22
1/4W
33
1k
:RN-CP
2SC3311A
PROT
AS431LAN
ERROR AMP
A00AST-V5
HEATER REG.
TEA1504-N2
SW REG.
CONTROL
TLP621D4-Y
PHOTOCOUPLER
RCC CONTROL
A05T
5V REG.
2SK2843
SW REG.
OUT
1SS119-25TD
DTC114EKA
HEATER
SW
2.2k
:RN-CP
PWR SWPWR SW
15V
180V
-15V
80V
STY5V
155V-3
6.3V
3
1
21
54
OO
DEM
NC
GND
NC
VCTRL
IREF
VIN
HVS
NC
DRIVER
ISENSE
VAUX
DS
GND
VCC
CTL
OUT
VADJ
A
HEATSINK
TO Q602
TO HEATER
A

- 7 -
4. Protectio Circuits
The following are protection circuits: OCP OVP UVLO and secondary short circuits. OCP is pulse by pulse and is performed
on the primary side. OVP detects excessive output voltages. UVLO detects output under voltages. The following will explain
the operation of these functions.
OCP
OCP is activated if there is too much current passing through the switching power MOSFET Q602. This condition will
occur if either the B+ line or 80 volt line is shorted.
R614 and R654 are the current sense resistors. Current through these resistors will produce a positive voltage. R623
R624 R657 and C650 provide a voltage divider and filter to IC601 pin 5 (Isense). If the voltage level exceeds 0.5 volts the
IC does pulse by pulse current limit and the output voltages are reduced. This condition can be audible and characterized by
a chirping sound.
OVP and UVLO
The OVP and UVLO functions are detected by IC601 pin 6 (Vaux). Vaux is typically 12.3V. In the event the regulation control
loop were to fail the output voltages would either increase or decrease; then Vaux would increase or decrease respectively
via T601 transformer coupling. IC601 pin 6 will detect an OVP at 14.7V and UVLO at 8V turning off the driver output and
initiating a low dissipation safe-restart mode.
Secondary Short Circuits
Safe operation during secondary short circuits is provided by the demag function of IC601 pin 13. Demag protection
reduces the switching frequency thereby reducing the input power level and providing safe operation. Demag also
provides a soft start function during startup gradually increasing the switching frequency until fixed frequency operation
is attained.
5. Troubleshooti g
Warning
Before attempting to fix the power supply safety should be considered first. Never connect test probes to the primary side
circuits unless proper isolation has been installed. If isolation for the AC mains is not present serious harm can occur.
Never assume you are safe.
Protection Circuits
4
6
7
9 10
11
5
12
13
15
16
17
18
14 2
1
S
1
2
3
4
5
6
7 89
1011121314
R613
D609
D606
D607
D608
D620
R640
C647
C615
R602
C612
C616
R615
R616
D625
R605
JW613
T601
C618
JR019
S602
D610
C650
C665
D623
C617
C614
R619R656
R635
R654
R614
R624
R618
R620
R606
R693
R603
R655
R622
C681
C613
D638
R621
R698
C610
R612
R623
R610
IC601
Q602
D616
VA603
R657
22
25V
470p
500V
UF4007G23
UF4007G23
UDZ-TE-17-13
JW(7.5)
4.7M
1/2W
4.7M
1/2W
1
:FPRD
0.068
250V
0.1
:PT
MTZJ-T-77-121SS119-25TD
22
25V
1.8k
:RC
0.47
1W
:RS
1.5k
2W
:RS
22k
3W
:RS
0.39
1W
:RS
1.5k
2W
:RS
RGP10DG23
SRT
NEW
100
470
4.7
50V
270p
2kV
0.01
:CHIP
0.022
:CHIP
6800p
:CHIP
0
:CHIP
0:CHIP
JW(7.5)
470k
:RN-CP
680k
:CHIP
1.0M
:CHIP
220
:RN-CP
33k
:RN-CP
22
:CHIP
22
:RN-CP
75k
:CHIP
56k
:CHIP
MTZJ-18
MTZJ-T-77-4.7MTZJ-T-77-18
330
400V
22
1/4W
33
1k
:RN-CP
TEA1504-N2
SW REG.
CONTROL
2SK2843
SW REG.
OUT
MTZJ-T-77-4.7
155V-3
21
54
OO
DEM
NC
GND
NC
VCTRL
IREF
VIN
HVS
NC
DRIVER
ISENSE
VAUX
DS
HEATSINK
TO Q602
A A

- 8 -
Caution: C610 has a Slo Voltage Discharge
If the front panel power on/off button is switched to the off position prior to the AC mains input power being removed from
the monitor then electrolytic capacitor C610 discharges with a long time constant. When the monitor cabinet cover and/or
EMI shield are removed making the D board circuitry accessible during servicing or repair by qualified personnel the
following procedure is recommended: Always remove the AC mains input power from the monitor prior to switching the
front panel on/off button to the off position. The AC mains input power should be removed from the monitor for a mini-
mum of 30 seconds before the front panel on/off button is switched to the off position.
Caution: Do NOT Touch IC610 Component Tab or Heat Sink
IC610 component tab has an electrical voltage potential equivalent to the primary side return (approximately AC mains
input voltage potential). If IC610 heat sink insulator pad and/or shoulder washer busing are damaged or not assembled
correctly then the IC610 heat sink will have an electrical voltage potential equivalent to primary side return (approximately
AC mains input voltage potential).
No Po er
In the event that the monitor does not turn on first verify input power is applied to CN600 and the front panel power button
is turned on; then check F601. If F601 is blown the primary side circuitry should be checked. If the fuse is not blown then
check the secondary side circuitry especially the protection circuits. If these circuits are causing a no power symptom the
problem can be more readily found.
AC Input and Degauss Circuit Trouble Shooting
For no power or nonoperating power supply the AC input circuitry should be checked. Open or short circuit elements will
cause non-operation. Check F601 CN600 D601 R600 TH600 and R605 on the D Board. Check the front panel power
button for continuity.
If all elements are correct check whether F601 breaks when power is applied and the power button is closed. If the fuse
does blow there probably is a component shorted in the prmary circuitry.
The degauss will malfunction if CN601 is not connected. One problem could be loss of degauss signal from the micropro-
cessor. This can be verified by using the manual degauss command found in the OSD menu. If the signal does not appear at
Q601 base then it is possible that the microprocessor does not function correctly or standby 5V is not functioning.
The second step is to place a short across the AC terminals of RY601 for less than two seconds. If degauss operates then
check Q601 and RY601. If degauss does not work check TH601 for an open condition and C631 for a short condition.
Primary Section
Three main areas can diagnose primary circuit failures. These are IC601 Q602 and Feedback system.
Visible checks of these areas will aid in finding problems. The following will discuss each section.
IC601
First apply AC to the monitor and check IC601 pin 4 output. If the output on pin 4 is not present there could be problems
with Q602 and related parts or pin 14 could be less than 2.5 volts. Further check Vaux level at pin 6. If it less than 11V
the IC could be in safe-restart mode. If the voltage is very low there could be a short on any of the IC pins. In reference
to ground check the impedance of pin 1 8 and 14. If any of these pins are shorted replace the IC and check components
connected to the related pins. Take care that C616 C617 and C681 are fully discharged before replacing the IC.
Q602
The switching transistor can be damaged in various ways. These are related to voltage current and temperature.
Check whether the transistor is shorted across drain and source terminals. If there is a short F601 R605 R614 R654
R623 R624 R657 and C650 should be checked. Additional components to check are D608 R603 R612 and IC601. If
Q602 is shorted all these parts should be replaced.
Failure of a secondary rectifier diode can also cause Q602 to fail. Check 180V and 80V diodes for open or short
conditions. There is also a clamp circuit which is used to clip the turn off spike found on Q602 drain. If the clamp
circuit is broken it can cause Q602 failures. Check D606 C612 and R635. Also check the snubber circuit components
C613 D607 R619 and R656.
Secondary Circuit
Failure in the secondary circuits can be categorized by rectifier diodes regulators feedback loops and protection circuits.

- 9 -
These sections are interrelated and failure in one can affect another. Consequently some failures will also affect the
primary circuitry.
Rectifier Section
Rectifier diode failures are not common but do occur. Deflection video and high voltage circuitry failures contribute to
diode damage. In the event a voltage is not present check for shorts to ground open or short diodes.
+5/12 Volt Regulator
If +12V or +5V output line is not available or the wrong voltage IC605 or IC608 may be damaged. Before replacing
either IC check for shorts or damaged parts along the output lines. If +12 volt does not appear check the Remote Sw
signal from IC901 pin 6.
Standby 5V Circuit
Failure of this circuit can be affected by IC607. In case the circuit does not work properly check D605 D614 R611 and
Q604. If these components are good check the remaining circuit parts. Another possible influence can be the heater
circuit. Since both the standby 5V and heater voltages are produced by T6-1 winding 13-14.
Heater Voltage Regulator
This circuit may be affected by R697 or D619. If these parts are good check the regulator output for a short to ground.
Shorts can occur on the video board. In the case of Power Sw signal.
Feedback Circuit
Problems with feed back can cause power supply shut down and low or high output voltages. First determine whether the
power supply is operating in active off active on modes or not at all.
The power supply can be stuck in active off mode. The Remote Sw signal Q603 Q604 D605 and IC603 can affect this
condition. Likewise if the power supply is always in active on mode the same items should be checked along with
D612 D613 D621 C619 C620 R626 R636 and R660.
Checking for voltages at IC603 pins 1 and 2 IC604 pins 1 and 3 can solve more difficult problems. Additionally IC603
pins 3 and 4 and IC601 pin 9 should be checked. If there are problems with these devices 180V or standby 5V line the
feedback systems will not work correctly. Also check the protection circuits.
Protection Circuits
OCP occurs when there is excessive current through Q602. Failures with Q510 Q507 or the video section could cause
this condition. These areas should be checked. OCP condition can also occur if R614 or R654 are open; if R623 or
R657 are shorted; or if R624 is open.
OVP usually occurs when the feedback loop is open or loss of standby 5V. Isolate the OVP trigger condition by first
checking the operation of the feedback loop.
6. USB/Audio Power Circuit
CAUTION: Do not tou h IC610 omponent tab or heat sink. The IC610 component tab has an electrical voltage
potential equivalent to the primary side return (approximately AC mains voltage potential). If the IC610 heat sink insulator
pad and/or shoulder washer bushing are damaged or not assembled correctly then the IC610 heat sink will have an electrical
voltage potential equivalent to the primary side return (approximately AC mains voltage potential).
The USB/Audio power supply circuit is a flyback converter that uses an integrated power mosfet and switch mode pwm
control IC (IC610). The circuit consists of IC610 T602 D633 PH601 IC611 and associated circuitry. Start up is
initiated when C675 connected to the CONTROL pin 1 is charged via a high voltage current source internal to IC610.
When CONTROL pin 1 reaches 5.8V the control circuitry and mosfet are activated and a 10mS soft-start begins. The
typical mosfet DRAIN pin 7 switching frequency is 130 KHz with a ±4KHz jitter. The feedback loop consists of shunt
regulator IC611 and optocoupler PH601 that will regulate the secondary side output voltage at 6.5V and provide feedback
current to CONTROL pin 1. During normal operation T602 bias winding pins 3-4 provide the charging current to maintain
CONTROL pin 1 at 5.8V; additionally the CONTROL pin 1 charging current that is regulated by IC611 and PH601 controls
the mosfet duty cycle to provide closed loop regulation.
The front panel power button controls the on/off function for the USB/Audio power circuit. When the power button is in
the OFF position the MULTIFUNCTION pin 3 is shorted to CONTROL pin 1 turning off the power circuit. When the
power button is in the ON position the MULTIFUNCTION pin 3 is shorted to primary side DC mains return which enables
the power circuit.

- 10 -
H Deflection Circuit
R553
R569
CN801
H FLY
TO: IC901 #32 pin
IC902 #14 pin
TO:
H Lin and
Ringing Circuit
E/W PIN #9
IC902
HD output pin #17
IC902
1
H DY+
2
HDY-
4 3
H DY+
HDY-
3
R551
R584
Q903
12V
12V
Q501
Q502
Q511
R511
T504 HDT
1
4
6
D502
-15V
Q507
H-OUT
D506
C518 Q508
Q521
12V
180V
R582 Q520
B+CHOP
D518
C575
D516
H Def
IN
H Reg
Out
H SHAPE
IN
HD
IN
PWM IC501
L503 HOC
T505
HST
3 1
21
2
C543
C563
R933
R504
R594
C502
R509
R508
D501
R513
C510
R517
R518
C521
C522
FB506
R581
FB504
C574
C582 R583
C576
8
3
2
1
R522
S Cap Sws
5
FB507 FB508
20
8

- 11 -
A voltage clamp to limit the peak voltage on DRAIN pin 7 is provided by D635 and D636. Bypass capacitor C677 is
utilized to improve high frequency noise immunity.
IC610 provides the following protection functions: a 10mS soft-start function a cycle-by-cycle peak current limit func-
tion a shutdown/auto-restart function if an out of regulation condition occurs and an over temperature protection function.
D BOARD DEFLECTION SECTION
1. Horizo tal Deflectio Circuit
Overvie
These circuit drive the DY (Deflection Yoke) for Horizontal Deflection. The H size and H shape control (IC501 and around)
is included in this page as well.
H Drive, H Out, Feedback
+12Vp-p HD pulse is generated by the inverter Q903 using the Jungle IC902 H. out pin #17. And switch Q511 through A
push-pull amplifier (Q501 and Q502) buffers. The drive current which introduced in HDT (T504) by this switching will
drive Q507 (H out Tr) and 1000V pulse appears on collector. D506 is the "Damper Diode" which avoid the negative pulse
and discharge the energy for next Horizontal Drive. Q508 is the buffer for the "H BLK" feed back to Jungle IC 902 H. FLY
pin #14 and it will be the reference of phase / jitter control of Jungle. HST (T505) is to sense the deflection current
through DY. The voltage appeared on secondary side will be the feed back for H Size/Shape control.
H Size/Shape control
HD pulse also triggering the H Size/Shape control IC501 pin #8. IC501 is "PWM IC" and it controls H and HV B+
chopper duty. H Shape and H size information is already included and coming from Jungle IC902 E/W pin #9. It will be
supplied to IC501 pin #2. H reg output pin #20 is switching pulse of Q520 (B+ chopper). The energy supplement from
180V to H Def circuit (through L503 HOT) is controlled by the duty of this pulse. The H Shape input and feedback
voltage from T505 are compared by error amp (in IC501) and H Reg out pulse duty is controlled to keep the level of
these two the same.
18
2
3
4
5
6
1
2
4
3
1
23
1234567
C670
C671
C672
C673
C675
C676
C677
D633
D634
D635
D636
IC610
IC611
L607
PH601
R630
R631
R632
R634
R639
R641
R651
T602
*
*
*
*
*
*
*
*
*
*
*
*
POWER SUPPLY
CONTROL IC
*
ERROR AMP
*
*
CONTROL
*
*
*
*
*
*
*
*
SRT
D
F
S
M
C
A
+6.5V
To SW 602
USB/Audio Power Circuit

- 12 -
1 2 3 4 5
6 7 8
1
5 7 8
3 4
6
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1
2
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1
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3
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#
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B
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C
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4
9
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5
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5
1
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5
2
&
5
3
H
D
Y+
H
DY
-
T
O
T
O
D(BOARD)
H. LINEARITY AND RASTER DISTORTION CORRECTION CIRCUIT

- 13 -
1 2 3 4 5
6 7 8
1
5 7 8
3 4
6
S
SSS
15 23
4
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1
2
3
56
7
1
0
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15
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2
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52
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5
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5
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0
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50
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D
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2
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5
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1
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5
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0
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68
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R
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T
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C5
0
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C
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1
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3
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R
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4
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06
R
56
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1
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C
5
07
CL
P
00
3
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2
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C
H
AN
G
E
2
S
K
20
9
8
S
C
AP
CH
A
NG
E
2
S
K2
0
98
S
C
AP
CH
A
N
GE
2S
K
20
9
8
S
C
A
P
C
H
AN
G
E
0
.0
6
82
50
V:
P
P
2
S
A1
0
37
A
K
SW
10
p
2k
V
1
0p
F
2
k
V
JW
(1
5
)
H
CC
4
70
1
/2
W
D
1
N
L2
0
UD
1N
L
20
U
4
7
0
1/
2
W
1
0
0
V.DF
H
L
IN
1
2V
S
TB
Y5
V
12
V
1
2
V
2
7
0V
-
2
S
2
S
0
S
1
S
3
S
4
P
I
N
#
12
I
C
9
02H
C
E
N
T
E
R
PI
N
#
4
I
C
9
0
1
P
I
N
#
1
5
T
O
F
B
T
FR
O
M
I
C
90
1
P
I
NS
4
9
,
5
0,
5
1
,
5
2
&
5
3
H
D
Y+
H
DY
-
T
O
T
O
D
(BOARD)
(17VC H. CENTERING CIRCUIT)

- 14 -
Troubleshooting
See attached FLOW CHART and confirm if its really an H Deflection issue.
No H Deflection / No Po er
Check Q507 Q520 and D506 first. In case any of these shorted check T504 Q511 R511 and D502.
Those parts might have been damaged.
If both of Q507 520 were not broken check the HD pulse at the gate of Q511.
If no pulse check Q501 Q502 Q903.
Otherwise check R582 D518 or try changing IC501.
Bad Distortion
Check pin#2 of IC501 and confirm that proper DC level and AC waveform.
If the distortion is on only right side check all above (No H Deflection).
Otherwise refer to the Troubleshooting of next section (H Lin and Ringing Correction).
2. H Li earity a d Raster/Distortio Ri gi g Correctio Circuit
This section includes HLC Control circuit S cap switching and HLC/S-Cap Damping circuits. These circuits are placed
directly on the cool side of DY which is in series with deflection current line. H Centering circuit will be explained in
next section.
HLC Balance Control and HLC Damping
HLC (L508) effectiveness is changed by LCT (T506) for each fH since T506 and L508 are in parallel. LCT is the Cross
Transformer that can change its inductance accordingly to the DC current of the secondary side. The current of the
secondary side is controlled by the DAC output of Micro (IC901 - pin 4) through Q519. It can be changed by the register
"HLIN_BAL_LOFH" "HLIN_BAL_MDFH" and "HLIN_BAL_HIFH". D505 C581 and R577 make up the damping
circuit to avoid Raster Ringing (mainly on the left side of the picture) caused by HLC DY and S-caps.
S-Cap s itching and S-cap Damping
H Def current is distorted by resonance between S-Cap and DY to correct the linearity. Since the resonance frequency
has to be changed for each fH S-Cap switching is controlled by MICRO
S-Cap Switch - FETs (Q512 Q513 Q514 Q515 Q516) are "On" when its gate is Hi(5V) and that moment drain voltage
should be grounded (0V).
L506 R578 and C573 is damping circuit to avoid Distortion Ringing (mainly on top of the picture) caused by S-caps and
H Control loop gain. L505 R575 and C572 is also the same purpose as above but only works when Q514 (Switch for the
Biggest S-Cap) is On.
Troubleshooting
See attached FLOW CHART and confirm if its really H lin issue.
Bad Linearity
Confirm that Raster is approximately in the center of the Bezel. If not refer to next section (Raster Centering Circuit).
Check S-cap switches (Q512 513 514 515 516 HLC switch (Q519)) and confirm that H Linearity changes propor-
tional to the value of S-Cap DAC. Confirm that H.LIN BAL changes by the register value of "HLIN_BAL_LOFH"
"HLIN_BAL_MDFH" and "HLIN_BAL_HIFH". If not working check Q519 C508 or T506.
Bad Top Distortion/ Left side Raster Ringing
Check damping circuits explained above.
3. H. Raster Ce teri g Circuit
Overvie
H center circuit is changed from D99 type in which the Power OP-Amp is used
H Center Circuit
H Centering is changed by rotating RV502 to change the current through HCC (L510). Micro is no longer controlled.
Troubleshooting
See attached FLOW CHART and confirm if its really H Center Circuit issue.
No Raster Centering Control
Check R526 R529 and L510 first. Then check D530 and D531. If these parts are good check RV502.

- 15 -
4. Rotatio Circuit
Rotation is a PWM waveform at approximately 125kHz measuring 5Vp-p at pin #3 of the micorprocessor IC901. Then
filtered by R560 and C547 combination. The DC current is output by powered OP-amp (IC502). The output current from
pin #4 of IC502 flows through R563 and the rotation coil and returns to ground through R566. The feedback is sensed at
R566 and sent back to the amplifier through R562.
No Rotation Control
Check the waveform pin #3 of microprocessor IC901 if it is 5Vp-p PWM and approximately 125kHz. Otherwise check
around IC502.
5. Dy amic Focus Circuit
Overvie
Both H and V Dynamic Focus are combined through DFT (T503).
H DF
Horizontal Parabola is injected into the secondary side of the focus transformer (DFT:T503). In order to keep the amount
of parabola constant over the horizontal frequency range the values of the AC coupling capacitors are changed by the
transistors which switch the s-caps. This signal is amplified by the turns-ratio to the primary side of the transformer.
V DF
V DF waveform is buffered by Q505 and amplified by Q504 to about 130Vp-p. VDF is controlled by Jungle IC902 pin #12.
300v Vcc is made by FBT through D515. This voltage is also used for HV Protector.
Troubleshooting
See attached FLOW CHART and confirm if it is really a DF issue.
Bad H DF
Check H. Linearity. If there is no problem change T503 (DFT).
Bad V DF
Confirm that waveform is around 1Vp-p from Jungle pin 12 of IC902. If its more than 2.0Vp-p change Jungle IC902.
Check 300v from FBT.
V-
V+ +
-
5
3
41
2
STBY
5V
3
Rotation Coil (CN701)
+15V
-15V
ROTATION
IC901
R562
R566
R563
IC502
R558
C547
R560
R559
C549
C513
#1, 2 PIN
Rotation/Vertical Key Circuit

- 16 -
Dynamic Focus Circuit
1 2 3 4 5
6 7 8
1
5 7 8
3 4
6
S
SSS
15 23
4
S
1
2
3
56
7
1
0
R5
15
R5
2
1
R
52
5
R
5
33R
5
36
C5
0
1
C
50
4
D
51
2
C
5
23
C5
1
6C
5
25C
52
9
R5
0
5C
53
1
C5
68
C
5
17
R
5
89
R
5
90
R5
0
2
R
52
8
L
50
8
C
57
2
T
50
5
T
5
03
T
50
6
D
5
05
C5
0
3
C
50
6
C
51
2C5
1
5C
5
20C
53
6C5
3
8
R
51
4
R
50
7
R5
06
R
56
5
R
50
3
R5
1
2
R
51
9
C
5
07
CL
P
00
3
R
5
23
R5
2
4R5
35
R
53
7
C
51
4R
57
5
R
57
8
C
57
3
L
5
06
R5
7
7
C
5
81
D5
0
8
R5
01
R
5
71
D5
1
1
R
51
6
R5
91
R5
9
2
C5
3
0
L
5
05
C
50
9
Q5
0
4
Q
50
5
Q
51
9
Q
5
16
Q
51
5
Q
5
1
2
Q
51
3
Q5
1
4
C
51
1
Q
52
1
C5
0
5C
57
1
R5
38
L5
1
0
P
S
50
1
R
52
9
D
5
31D
53
0
R5
2
6
R
V5
0
2
10
3
30
p
5
00
V
B
0
.
01
:
PT
0
.0
47
4
0
0V
:
PP
0.
0
47
4
00
V
:
PP
0
.
04
740
0
V:P
P
4.
7
2
50
V
1
k
:
FP
RD
1
k
:
FP
R
D
1
k
:F
P
RD
1k
:F
P
RD
1
k
:
F
PR
D
1S
S
11
9
-2
5
T
D
H
S
T
N
E
W
L
C
T
N
E
W
0
.
18
4
0
0V
10
0
1
/2
W
:
FP
R
D
2
.
2
2
50
V
10
0
1
/2
W
:R
S
22
00
p
1
kV
D
1
NL
2
0U
2.
2
mH
1
00
33
0k
:
RN
2
.7
k
:R
N
4
.7
3
9
:
RN
1
M
5
6k
:
RN
5
6k
:
RN
5
6k
:
RN
56
k
:R
N
3
30
k
:
RN
:
DF
T
1S
S
35
5
T
E
1
0
0
3
W
:
R
S
0.
0
1
B:
C
HI
P
0
.0
1
B
:C
H
IP
0
.0
1
B
:C
HI
P
0
.8
2
2
50
V
:P
P
0.
0
1
B:
C
HI
P
0.
2
7
25
0
V
:
P
P
0
.
01
B
:C
H
IP
0.
0
82
2
50
V
:P
P
0
.0
1
B
:C
HI
P
0.
0
1
B:
C
HI
P
H
LC
N
EW
20
0
k
:R
N-
C
P
10
k
:
RN
-C
P
1
0
k
2
.2
k
:
CH
I
P
4
.
7k
:
CH
IP
2
2k
:
R
N-
CP
0
.1
2
5
0V
:
PP
D
1N
L
40
-
T
A
6
.
8k
:C
H
IP
1
5
0
1
/4
W
:
R
N
1
5
0
1/
4W
:
R
N
1
50
1/
4
W
:
RN
0.
1525
0
V:P
P
2.
2m
H
0
.
1B
:C
H
IP
2
S
C3
9
41
A
-
QR
V
.
DF
AM
P
2
SA
1
03
7
B
U
FF
E
R
2S
C
33
1
1
A
S
W
2
S
K
33
3
2
S
C
A
P
C
HA
N
G
E
2S
K
33
3
2
S
C
A
P
C
H
AN
G
E
2
S
K
20
9
8
S
C
AP
CH
A
NG
E
2
S
K2
0
98
S
C
AP
CH
A
N
GE
2S
K
20
9
8
S
C
A
P
C
H
AN
G
E
0
.0
6
82
50
V:
P
P
2
S
A1
0
37
A
K
SW
10
p
2k
V
1
0p
F
2
k
V
JW
(1
5
)
H
CC
4
70
1
/2
W
D
1
N
L2
0
UD
1N
L
20
U
4
7
0
1/
2
W
1
0
0
V.DF
H
L
IN
1
2V
S
TB
Y5
V
12
V
1
2
V
2
7
0V
-
2
S
2
S
0
S
1
S
3
S
4
P
I
N
#
12
I
C
9
02H
C
E
N
T
E
R
PI
N
#
4
I
C
9
0
1
P
I
N
#
1
5
T
O
F
B
T
FR
O
M
I
C
90
1
P
I
NS
4
9
,
5
0,
5
1
,
5
2
&
5
3
H
D
Y+
H
DY
-
T
O
T
O

- 17 -
6. High Voltage Protect Circuit
This circuit generates the High Voltage supply for the anode. It consists of a high voltage driver and regulator similar to a
switching power supply function. In addition there are High Voltage and Beam Current protection circuits. All those
circuits are similar to D99 chassis circuits.
High Voltage Regulation and Output Circuit
The HV Drive pulse is generated by IC501 and synchronized with Horizontal drive pulse. It is supplied to the Gate of Q510
the HV Out FET.
The HV Out Pulse approximately 700V is generated by Q510 switching with the peak voltage being controlled by the
switching duty of Q503 (B+ chopper). Internal resistors and R540 and RV501 divide HV generated in the FBT. Since this
voltage is the feedback for HV Regulation control. Adjusting RV501 will result in changing the HV Regulation level(= HV
level). HV Feedback voltage is returned to IC501 at pin#12 to be compared with an internal reference voltage of IC501 at
pin#13. According to this feedback level IC501 changes the pulse duty cycle. This pulse is felt at pin #18 of IC501 thereby
controlling the output of B+ chopper drive Q503.
G1 Voltage (-33Vdc)
D510 and C528 through R532 rectify -57Vdc developed by a -57V winding of FBT. It is then regulated by D503 and C533
to be -33Vdc typ through R539. -33Vdc is supplied through R570 to the A Board via CN510.
HV Protect Circuit
HV Protect circuit will be activated by the Microprocessor when the signal at HV DET, Microprocessor pins#18 reaches a
5vdc level. HV DET indicates the level of the primary current developed by the 270V winding of the FBT through R543,
D515.
Beam Current Protect
Beam Current Protect will be activated when ABL DET at microprocessor pin#16 reaches a level of 0V when operating in
main mode. ABL DET level is corresponding to the Beam Current which is supplied to FBT through R596 R550 and R548.
The voltage current relationship is inversely proportional Voltage (down) Current (up).
Troubleshooting Hints
See attached FLOW CHART to confirm if is really an HV/Protect Circuit issue.
No HV / No Po er
Perform basic checks of Q510 and Q503 first. If both Q510 and Q503 were not broken check the HV Drive pulse at the
gate of Q503. If no pulse check R534 and D509. Otherwise check R520 D504 or try changing IC501.
No G1 Voltage
Check R532 D503 and D510
Protect Malfunction
To see if HV Prot or ABL Prot are suspect check the Shutdown Log data at the Shutdown Log register. Refer to Shutdown
Log Table below.
When an HV Shutdown is indicated check R917 R921 R543 D515 and D517 or replace T501 (FBT).
Where ABL Shutdown is indicated check the voltage T901 pin#11.
If it is higher than 0.5v immediately prior to shutdown. Should the voltage reach and remain at the 0 volt level even after
the first 2.0 seconds of Power On check D514 or check White Balance.
SHUTDOWN LOG TABLE
Bit Register value Shutdo n Mode Comment
bit7 128 N/A N/A
bit6 64 N/A N/A
bit5 32 S Cap Shutdown Explained later
bit4 16 ABL Shutdown Hardware Controlled
bit3 8 HV Over Hardware Controlled
bit2 4 HV U Shutdown Not Used
bit1 2 No Vertical Scan Explained later
bit0 1 No H Scan Explained later

- 18 -
H
V
1
1
F
V1
1
3
1
6
1
5
1
4
F
V2
1
2
2 1
10
9 8 5 3 4 6 7
SV
S
S
C
54
1
R
54
3R
V
50
1
C5
44
C
5
35
C
5
56
S
G5
01
D
5
14
C
54
2
R
53
2
C
53
2
C5
39
D
5
1
7
D
51
3
C
53
4
C5
1
9
C
52
4
D
50
4
T5
0
1
D
5
15
C5
4
0
R
5
41
R
54
2
R5
4
8R5
5
0R5
96
R
51
0
R5
4
6
R
5
49
R5
4
0
R
54
7
R
59
5
R
53
0
R
5
31
R5
61
R5
4
5
R5
7
4
R
52
7
R
5
68
R5
9
7
L
50
2
C
52
8
R
5
39
D5
0
3
C
5
33
R5
5
2
R5
7
0
R
5
44
R5
20
L
5
01
D
5
0
9
Q
50
3
Q
5
10
C
52
6
D
51
0
F
B5
0
3
F
B
50
2
R
57
2
R
5
34C5
2
7
0
.2
2
1
00
V
0
.
03
3
1
00
V
0
.
1
:
P
T
0.
01
10
0V
4.
7
1
0
50
V
0.
01
:
PT
H
SS
8
2
H
Z
T3
3
-0
2
TE
2
.2
:F
PR
D
4
.
7
:
F
PR
D
10
0
k
1.
0
50
V
0.
0
1
63
0
V
H
ZT
3
3-
0
2
TE
1
0k
:
RN
82
3W
:
RS
8
23
W:R
S
82
3W
:
RS
0
.0
1
2
00
V
:P
T
D
1N
L
4
0
10
k
1/
2
W
:S
U
RG
E
N
EW
:F
BT
10
k
20
0
k
:
R
N
1
k
:R
N
1
k
:
R
N
33
k
:R
N
2
20
k
:R
N
1.
2
k
:
R
N
62
k
:R
N
1.
2
k
:
R
N
56
k
:R
N
47
k
2.
2
k
2
20
k
:
R
N
1.
2k
:
RN
2.
2
M
2
7
0k
1
20
0
p
2k
V
:P
P
33
2
00
V
2
2
0p
CH
:
CH
I
P
NN
C
D1
2
A
-T
1
ER
A
3
4-
1
0T
P
1
9
.1
k
:
R
N
4
7
k
:R
N
-C
P
1
00
:
FP
R
D
2
S
J4
4
9
H
V
R
E
G.
S
TP
4
N
B8
0
FP
HV
OU
T
22
00
p
5
00
V
D
1
NL
4
0U
0
0
0
.4
7
1/
2
1
00
:F
P
RD
0.
0
1
25
0
V
18
0
V
1
2V
2
70
V
-
2
J
0
0
1
PI
N
#
3
G1
T
O
A
B
O
A
R
D
H
V
D
E
T
P
I
N
#
1
8
I
C
9
0
1
H
V
D
R
I
V
E
PI
N
#
1
9
I
C
5
0
1
H
V
D
R
I
V
E
P
I
N
#
1
9
I
C
5
0
1
I
C
5
0
1
P
IN
#
1
2
"
H
V
F
E
E
D
B
A
CK
"
H
D
F
O
UT
H
&
D
F
O
UT
C
R
T
VI
A
B
L
K
F
V
L
E
A
D
A
B
L
D
ET
P
I
N
#1
6
I
C
9
0
1
D(BOARD)
17VC CHASSIS HV/PROTECTOR CIRCUIT

- 19 -
R406
R401 C402
C401
0
-15V
R404
C406
R405R403
0
RL
LVDY
R402
V-
V++
-
62
0
3
541
Flyback Generator
LA78040
V-DY through CN501
IC401 C403 D401
C404
D-BOARD
8 VSAW
IC 902
(Jungle)
5 Vref
IC 701
(CONV)
R409
R410
7
+15V
R412
C411
R413
C409
C410
Vertical Deflection Circuit

- 20 -
7. Protectio Circuitry Overview
Overvie
The 17VC chassis was developed with protection circuits other than HV/ABL.These protection circuits are controlled by
Microprocessor (IC901); All of these circuits are similar to the D99 Chassis.
 S Cap Shutdown: Activates when S-Cap Switch in FET are broken.
 V Scan Shutdown: Activates when Vertical Deflection signal is absent or of insufficient level or of a distorted nature.
 H Scan Shutdown: Activates when Horizontal Deflection signal is absent or of insufficient level or of a distorted nature.
Troubleshooting Hints
S Cap S itch Shutdo n
In the event of failure of any S-Cap Switching FETs and "POWER_SW" or AC Power Switch was turned off/on the
microprocessor detects FET Gate damage and goes into shutdown mode. For these conditions refer to the section of H
Linearity Circuit.
Vertical Scan Shutdo n
If the V FLY feedback at pin #19 the Microprocessor doesn't get pulse around 1.5 second a Shutdown will be initiated.
Power Supply problems may also produce a similar type failure. For these conditions refer to the V Deflection Circuit
or the Power Supply section.
Horizontal Scan Shutdo n
If the H FLY feedback at pin #32 of the Microprocessor doesn't get pulse around 500mSec Shutdown will be initiated.
Some power Supply problems may also produce a similar type failure. For these conditions refer to the H Deflection
Circuit or Power Supply sections.
8. Vertical Deflectio Circuit
Theory of Operation
The negative input of amplifier IC401 is driven by VSAW signal generated by Jungle IC902 pin #8. The positive input of the
amplifier is Vref Signal generated by IC701 (Convergence IC) pin #5. VSAW is centered on 5. 0V and sawtooth waveform
that controls VSIZE. Vref is a reference that is compared to VSAW at IC401. VCENTER is controlled by the shift of
17VC Chassis A Board Block Diagram
Cutoff
OSD Generation
Video
Process
D/A Conv
CRT
J001
G1, Heater and Focus Voltages from D Board
Front Input
I
2
C Communication
H and V Retrace
G2 Voltage
RGB Cathode Drv
Cutoff
Voltage
D/A Level
From
FBT