LG Flatron T710P User manual

COLOR MONITOR
SERVICE MANUAL
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
MENU SELECT
Brightview
MODEL: T710P (T710PG-EL)
CHASSIS NO. : CA-115
FACTORY MODEL: T710PG
T710PH (T710PG-HL)
*( ) ID LABEL Model No.

1. PICTURE TUBE
Size : 17 inch (Flat Square Tube)
DefIection Angle : 90°
Neck Diameter : 29.1mm
Diagonal Inch : 16.0”
Dot Pitch : 0.25mm
Face Treatment : Anti-Glare,
Anti-Static&Anti-Reflection
2. SIGNAL
2-1. Horizontal & Vertical Sync
1) Input Voltage Level: Low=0~1.2V, High=2.5~5.5V
2) Sync Polarity : Positive or Negative
3) Seperated Sync Signal
2-2. Video Input Signal
1) Voltage Level : 0 ~ 0.7 Vp-p
a) Color 0, 0 : 0 Vp-p
b) Color 7, 0 : 0.467 Vp-p
c) Color 15, 0 : 0.7 Vp-p
2) Input Impedance : 75 Ω
3) Video Color : R, G, B Analog
4) Signal Format : Refer to the Timing Chart
2-3. Signal Connector
15-pin Attached Connector
2-4. Scanning Frequency
Horizontal : 30 ~ 85kHz
Vertical : 50 ~ 160Hz
3. POWER SUPPLY
3-1. Power Range
AC 100~240VAC, 50/60Hz 2.0A
3-2. Power Consumption
4. DISPLAY AREA
4-1. Active Video Area :
• Max Image Size - 325.1 x 243.8 mm (12.79" x 9.59")
• Preset Image Size - 315 x 230 mm (12.40" x 9.06")
4-2. Display Color : Full Colors
4-3. Display Resolution : 1280 x 1024 / 75Hz(Max)
(Non-Interlace)
4-4. MTBF : 50,000HRS
5. ENVIRONMENT
5-1. Operating Temperature: 0°C ~ 40°C (Ambient)
5-2. Relative Humidity : 10%~ 90%
(Non-condensing)
5-3. Altitude : 5,000m
6. DIMENSIONS (with TILT/SWIVEL)
Width : 400mm (15.75 inch)
Depth : 411mm (16.18 inch)
Height : 401mm (15.79 inch)
7. WEIGHT (with TILT/SWIVEL)
Net Weight : 15.7 kg (34.62 lbs.)
Gross Weight : 18.3 kg (40.35 lbs.)
CONTENTS
- 2 -
SPECIFICATIONS ................................................... 2
SAFETY PRECAUTIONS ........................................ 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
CONTROL LOCATIONS ......................................... 6
WIRING DIAGRAM ................................................. 7
BLOCK DIAGRAM ................................................... 9
ADJUSTMENT ...................................................... 12
TROUBLESHOOTING GUIDE .............................. 14
EXPLODED VIEW...................................................24
REPLACEMENT PARTS LIST ............................... 26
PIN CONFIGURATION........................................... 32
SCHEMATIC DIAGRAM......................................... 33
PRINTED CIRCUIT BOARD................................... 35
MODE
MAX
NORMAL
Standby/Suspend
Power OFF
POWER CONSUMPTION
less than 90W
less than 73W
less than 15W
less than 5W
LED COLOR
GREEN
GREEN
AMBER
AMBER
SPECIFICATIONS

SAFETY-RELATED COMPONENT WARNING!
There are special components used in this color monitor
which are important for safety. These parts are marked
on the schematic diagram and the replacement
parts list. It is essential that these critical parts should be
replaced with the manufacturer's specified parts to
prevent X-radiation, shock, fire, or other hazards. Do not
modify the original design without obtaining written
permission from manufacturer or you will void the original
parts and labor guarantee.
CAUTION: No modification of any circuit should be
attempted.
Service work should be performed only after
you are thoroughly familiar with all of the
following safety checks and servicing
guidelines.
SAFETY CHECK
Care should be taken while servicing this color monitor
because of the high voltage used in the deflection circuits.
These voltages are exposed in such areas as the
associated flyback and yoke circuits.
FIRE & SHOCK HAZARD
An isolation transformer must be inserted between the
color monitor and AC power line before servicing the
chassis.
• In servicing, attention must be paid to the original lead
dress specially in the high voltage circuit. If a short
circuit is found, replace all parts which have been
overheated as a result of the short circuit.
• All the protective devices must be reinstalled per the
original design.
• Soldering must be inspected for the cold solder joints,
frayed leads, damaged insulation, solder splashes, or
the sharp points. Be sure to remove all foreign
materials.
IMPLOSION PROTECTION
All used display tubes are equipped with an integral
implosion protection system, but care should be taken to
avoid damage and scratching during installation. Use only
same type display tubes.
X-RADIATION
The only potential source of X-radiation is the picture tube.
However, when the high voltage circuitry is operating
properly there is no possibility of an X-radiation problem.
The basic precaution which must be exercised is keep the
high voltage at the factory recommended level; the normal
high voltage is about 26kV. The following steps describe
how to measure the high voltage and how to prevent X-
radiation.
Note : It is important to use an accurate high voltage
meter calibrated periodically.
• To measure the high voltage, use a high impedance
high voltage meter, connect (–) to chassis and (+) to
the CDT anode cap.
• Set the brightness control to maximum point at full
white pattern.
• Measure the high voltage. The high voltage meter
should be indicated at the factory recommended level.
• If the meter indication exceeds the maximum level,
immediate service is required to prevent the possibility
of premature component failure.
• To prevent X-radiation possibility, it is essential to use
the specified picture tube.
CAUTION:
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.
SAFETY PRECAUTIONS
- 3 -

- 4 -
TIMING CHART
VIDEO
SYNC
C
E
DFA
B
* Mode 1~Mode 4: Basic Mode
H–37.50 26.67 20.32 6.35 2.03 3.81 0.51
V–74.99 13.335 12.802 0.533 0.080 0.427 0.026
H + 46.88 21.33 16.16 5.17 1.62 3.23 0.32
V + 75.01 13.331 12.798 0.533 0.064 0.448 0.021
H + 53.68 18.63 14.22 4.41 1.14 2.70 0.57
V + 85.07 11.755 11.178 0.577 0.056 0.503 0.018
H + 68.677 14.561 10.836 3.725 1.016 2.201 0.508
V + 85.00 11.764 11.182 0.582 0.044 0.524 0.014
Mode H/V
Sort
640x480
75Hz
800x600
85Hz
1024x768
85Hz
800x600
75Hz
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
Sync
Polarity
Frequency Total Period
(A) Video Active
Time (B) Sync Duration (E)
Blanking Time
(C) Back Porch
(F) Front Porch
(D)
Resolution

- 5 -
OPERATING INSTRUCTIONS
1. Power ON/OFF Button
Use this button to turn the monitor ON or OFF.
2. Power Indicator
This indicator lights up green when the monitor operates
normally; in DPMS (Energy Saving) mode, -stand-by,
suspend, or power off mode -its color changes to
orange, and if abnormal or damaging circuit turns out
orange blink.
3. Select Button
Use this button to enter a selection in the on screen
display.
4. Button
Use these buttons to choose or adjust items in the on
screen display.
5. MENU Button
Use this button to enter or exit the on screen display.
6. Brightview Button(To apply the High brightness)
Use this button to select brightview function.
(TEXT/PHOTO/MOVIE/NORMAL)
FRONT VIEW REAR VIEW
AC Power Socket
Signal Connector
ID Label
Front Control Panel
MENU SELECT
Brightview
Power ON/OFF Button
See Front Control Panel
MENU SELECT
Brightview
Buttons
MENU Button
Power Button
Power (DPMS) Indicator
SELECT Button
Brightiew Button
<Shortcut Keys>
•Brightness and Contrast can be
adjusted directly without entering
the On Screen Display (OSD)
system.
Press the buttons to adjust the settings and then the
MENU button to save all changes. The Brightness and
Contrast functions are also available in the On Screen
Display (OSD) menu.
100
100

CONTROL LOCATIONS
- 6 -
VR701
: High Voltage Regulation off-set
Voltage Adjustment(4.6V)
VR901: B Adjustment
(50V Line)
+

WIRING DIAGRAM
- 7 -
P501
P201
P405
P904
T1
P905
P301
P302
G2
P702
P701
P402
P902
S+
S
Signal
Cable
AC
Socket
FBT

- 8 -
DISASSEMBLY
1. TILT/SWIVEL & BACK COVER REMOVAL
1) Set the monitor face downward.
2) Carefully remove the Tilt/Swivel by pulling it upward.
3) Pressing the latch (b), Back cover by pushing it upward.
4) Release the latch (c). (See Tip Spec.)
5) Slide the Back Cover away from the Front Cabinet of the monitor.
Tip
C
B
A
Tip Spec.
A(Width) : 5.0~15.0mm
B(Depth) : 0.6~0.9mm
C(Height) : 12.0mm
(a)
Back Cover
Cabinet
(b)
(c)
1
22
3
3

BLOCK DIAGRAM
- 9 -
Power Input
90~264VA C
(50/60Hz)
Line
Filter
Degaussing
Circuit
[ OSD Control ]
SMPS
Control
(IC901)
TILT
Control
Circuit
6.3V
15V
E2PROM
(IC402)
5V
OSD IC (IC301)
H-Sync Signal V-Sync Signal I2C DATA (SDA)
I2C CLOCK(SCL)
VIDEO
Pre-A mp
(IC302)
Signal
Cable R
G
B
VIDEO
Main Amp
(IC303)
CUT OFF
Control
(IC304)
5V
H/V Sync Processor
( IC701) V-out
( IC601)
H-Linearity
Correction
X-RAY
Protection
Circuit
Dynamic
Focus
Circuit
Vertical blanking
- 160V
40V
15V
15V
MICOM
(IC401) SCL / SDA
H/V Sync. PWM Control Signal
15V
15V
50V
DY CDT
Heater ( 6.3V )
I2C
I2C
I2C
H/V
Sync
H.V
R/G/B
DRV/BIA S
Contrast
Bri ghtness
H-Drive
B-Drive
15V
I2C
BRIGHTNESS/CONTRAST H / V POSITION H / V SIZE SPCC TRAPEZOID PIN BALA NCE PARALLELOGRAM ROTA TION RECALL DEGAUSS COLOR CURVE MOIRE LANGUAGE TOP/BOTTOM CORNER INFORMATION EXIT
DPM
Control
Circuit
400V
6.3V
15V 80V
Degaus sing Coil
Dynamic Focus
Static Focus
TILT Coil
15V 50V
G2 G1
Auto Beam Limit
DC/DC Converter
FBT
( T701 )
80V
SMPS
Trans
(T901)
5V
H-OUT
(Q706)
5V
Voltage
Regulating
Circuit
Vout 1
Vout 2
B+
D/D Feed Back
Step-up

DESCRIPTION OF BLOCK DIAGRAM
- 10 -
1. Line Filter & Associated Circuit.
This is used for suppressing noise of power input line
flowing into the monitor and/or some noise generated in
this monitor flowing out through the power input line.
That is to say,this circuit prevents interference between
the monitor and other electric appliances.
2. Degauss Circuit & Coil
The degauss circuit consists of the degaussing coil,the
PTC(Positive Temperature Coefficient) thermistor
(TH901), and the relay(RL901).This circuit eliminated
abnormal color of the screen automatically by
degaussing the shadow mask in the CRT during turning
on the powerswitch.When you need to degauss in using
the monitor, select DEGAUSS on the OSD menu.
3. SMPS(Switching Mode Power Supply).
This circuit is working of 90~264V AC(50/60Hz)
The operation procedure is as follows:
1)AC input voltage is rectified and smoothed by the
bridge diode(D900) and the capacitor(C908).
2)The rectified voltage(DC) is applied to the primary coil
of the transformer(T901).
3)The control IC(IC901) generates switching pulse to
turn on and off the power control FET(Q901) the
primary coil of the transformer(T901) is turned on and
off repeatedly by Q901.
4)Depending on turn ratio of the transformer, the
secondary voltage appear at the secondary coils of the
transformer(T901).
5)These secondary voltages are rectified by each
diode(D941,D942,D951,D961,D962, D971) and operate
other circuit.(horizontal and vertical deflection,video
amplifier,...etc.)
4. X-ray Protection
If the high voltage of the FBT reaches up to
29kV(abnormal state), IC401(MICOM) pin 35 sensing
from FBT directly.
Then MICOM control IC701 (Deflection Controller) to
stop horizontal drive pulses and stop horizontal
deflection.
5. MICOM(Microprocessor) Circuit.
The operating procedure of MICOM(Microprocessor)
and its associated circuit is as follows:
1)H and V sync signa is supplied from the signal cable.
2)The Micom(IC401) distinguishes polarity and
frequency of H and V sync.
3)The Micom sets operating mode and offers the
controlled data.(H-size,H-position,V-size,...etc)
4)The controlled data of each mode is stored in itself.
5) User can adjust screen condition by each OSD
function. The data of the adjusted condition is stored in
EEPROM(IC402).
6. Horizontal and Vertical Oscillation.
This circuit generates the horizontal pulse and the
vertical pulse by taking the H and V sync signal.
This circuit consists of the TDA4866(IC601) and the
associated circuit.
7. D/D (DC to DC) Converter.
This circuit supplies DC voltage to the horizontal
deflection output circuit by increasing DC50V which is
the secondary voltage of the SMPS in accordance with
the input horizontal sync signal.
8.Side-Pincushion & Trapezoid Correction Circuit.
This circuit improves the side-pincushion and the
trapezoid distortion of the screen by mixing parabola
and saw-tooth wave to output of the horizontal
deflection D/D converter which is used for the supply
voltage(B+) of the deflection circuit.
9. Horizontal Deflection Output Circuit.
This circuit makes the horizontal deflection by supplying
the saw-tooth current to the horizontal deflection yoke.
10. High Voltage Output & FBT(Flyback Transformer).
The high voltage output circuit is used for generating
pulse to the primary coil of the FBT(Flyback
Transformer secondary of the FBT and it is supplied to
the anode, focus, and screen voltage of the CRT.
11. H-Linearity Correction Circuit.
This circuit corrects the horizontal linearity for each
horizontal sync frequency.
12. Vertical Output Circuit.
This circuit takes the vertical ramp wave from the
TDA4841(IC701) and performs the vertical deflection by
supplying the saw-tooth current to the vertical deflection
yoke.
13. Dynamic Focus Output Circuit.
This circuit takes the horizontal and vertical parabola
waves from the TDA4841(IC701) and amplifiers it to
maintain constant focus on center and corners in the
screen.
14. H&V Blanking and Brightness Control.
Blanking circuit eliminates retrace line by supplying
negative pulse to G1 of CRT.And Brightness control
uses the IIC line , changes the cut-off DC Level.
15. Image Rotation (Tilt) Circuit.
This circuit corrects the tilt of the screen by supplying
the image rotation signal to the tilt coil which is attached
near the deflection yoke of the CRT.

- 11 -
16. Video Pre-Amp Circuit
This circuit amplifies the analog video signal from 0-
0.7V to 0-4V.It is operated by taking the clamp,R,G,B
drive and contrast signal from the Micom(IC401).
17. Video Output Amp Circuit.
This circuit amplifies the video signal which comes from
the video pre-amp circuit and amplified it to applied the
CRT cathode.

ADJUSTMENT
- 12 -
GENERAL INFORMATION
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several adjustments may be required.
Adjustment should be following procedure and after
warming up for a minimum of 30 minutes.
•Alignment appliances and tools.
- IBM compatible PC.
- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)
- EPROM or EEPROM with saved each mode data.
- Alignment Adaptor and Software.
- Digital Voltmeter.
- White Balance Meter.
- Luminance Meter.
- High-voltage Meter.
AUTOMATIC AND MANUAL DEGAUSSING
The degaussing coil is mounted around the CDT so that
automatic degaussing when turn on the monitor. But a
monitor is moved or faced in a different direction, become
poor color purity cause of CDT magnetized, then press
DEGAUSS on the OSD menu.
ADJUSTMENT PROCEDURE & METHOD
-Install the cable for adjustment such as Figure 1and run
the alignment program on the DOS for IBM compatible PC.
-Set external Brightness and Contrast volume to max position.
1. Adjustment for B+ Voltage(VR901).
1) Display cross hatch pattern at Mode 4.
2) Check C999 (+) voltage to 50± 0.5Vdc.
2. Adjustment for High-Voltage.
1) Display cross hatch pattern at Mode 4.
2) DIST.ADJ→CTRL PWM →High Voltage Command.
3) Adjust High Voltage to 25.5kV
± 0.1 kVdc.
4) Press Enter Key.
3. Adjustment for High-Voltage Regulation offset
Voltage(VR701).
1) Display cross hatch pattern at Mode 4.
2) Check C810(+) voltage 4.6V
± 0.1Vdc.
4. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 4.
2) Run alignment program for T710PG on the IBM
compatible PC.
3) EEPROM → ALL CLEAR → Y(Yes) command.
<Caution> Do not run this procedure unless the
EEPROM is changed. All data in EEPROM (mode
data and color data) will be erased.
4) Power button of the monitor turn off →turn on.
5) COMMAND→PRESET START→Y(Yes) command.
6) DIST. ADJ. →CTRL PWM → TILT command.
7) Adjust tilt as arrow keys to be the best condition.
8) DIST. ADJ. →BALANCE command.
9) Adjust parallelogram as arrow keys to be the best
condition.
10) Adjust balance of pin-balance as arrow keys to be
the best condition.
11) Display cross hatch pattern at Mode 1~4.
12) DIST. ADJ. →FOS. ADJ command.
13) Adjust V-SIZE as arrow keys to 230 ± 2mm.
14) Adjust V-POSITION as arrow keys to center of the
screen.
15) Adjust H-SIZE as arrow keys to 310 ± 2mm.
16) Adjust H-POSITION as arrow keys to center of the
screen.
17) Adjust S-PCC (Side-Pincushion) as arrow keys to be
the best condition.
18) Adjust TRAPEZOID as arrow keys to be the best
condition.
19) Save of the Mode 1~4.
20) Save of the System
21) PRESET EXIT →Y (Yes) command.
5. Adjustment for White Balance and Luminance.
1) Set the White Balance Meter.
2) Press the DEGAUSS on the OSD menu for
demagnetization of the CDT.
3) COLOR ADJ. →LUMINANCE command of the
alignment program.
4) Set Brightness and Contrast to Max position.
5) Display color 0,0 pattern at Mode 4.
6) COLOR ADJ.→BIAS ADJ.→ COLOR No. → 1
command of the alignment program.
7) Check whether green color or not at R-BIAS and G-
BIAS to min position and B-BIAS to 127(7F) and
Sub-Brightness to 161(A1)[Normal CDT:127(7F)]
position. Adjust G2 (screen) command to
0.2
±0.05FL [Normal CDT: 0.1 ± 0.05FL]of the
raster luminance.
8) Adjust R-BIAS and G-BIAS command to x=0.283
±
0.005 and y=0.298 ± 0.005 on the White Balance
Meter with PC arrow keys.

- 13 -
9) Adjust SUB-Brightness command to 0.4
± 0.05FL of
the raster luminance.
10) COMMAND → PRESET START →Y(Yes) command.
11) Display color 15,0 full white pattern at Mode 4.
12) DRIVE ADJ.→ No 1. command.
13) Set Brightness and Contrast to Max position.
14) Set SUB-CONTRAST Max 90(5A) [Normal CDT:
127(7F)] (decimal) position.
15) Set B-DRIVE to 90(5A) at DRIVE of the alignment
program.
15-1) Adjust R-DRIVE and G-DRIVE command to white
balance x=0.283
± 0.003 and y=0.298 ± 0.003 on the
White Balance Meter with PC arrow keys.
15-2) Display color 15,0 window pattern (70x70mm) at mode 4.
16) Adjust SUB-CONTRAST command to 50 ± 2FL .
17) Display color 15,0 full white patten at Mode 4.
18) Set Brightness and Contrast to Max position.
19) COLOR ADJ. →LUMINANCE →ABL command.
20) Adjust ABL to 32 ± 1FL of the luminance.
21) After push the “ENTER”key, and “COMMAND →
PRESET EXIT →Y(Yes)”command.
22) Exit from the program.
6. Input EDID Data.
1) Display color 15,0 cross hatch pattern at Mode 4.
2) EEPROM → Write EDID command and confirm
“EDID Write OK!!”message of monitor.
3) Exit from the alignment program.
4) Power switch OFF/ON for EDID data save.
7. Adjustment for Focus.
1) Display “me”character in full screen at Mode 4.
2) Adjust two Focus control on the FBT that focus
should be the best condition.

- 14 -
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
TROUBLE IN
D900
TROUBLE IN FUSE
(F901)
TROUBLE IN
IC901
TROUBLE IN
D941, D942, D951,
D961, D971, Q901
TROUBLE IN
Q903, Q952,
Q951, Q942, Q941
CHECK
FUSE OK?
CHECK
C908 VOLTAGE?
(AC120V: 160VDC,
AC220V: 304VDC)
NO
YES
YES
YES
YES
NO
NO
NO
CHECK
IC901 PIN 6
WAVEFORM
(SQUARE WAVE
COMES OUT?)
CHECK
D941, D942, D951,
D961, D971, Q901
VOLTAGE?

- 15 -
2. NO CHARACTER
NO CHARACTER
CHECK
IC302
PIN 9(5V) ?
CHECK
IC302 PIN 5, 6, 7?
CHECK
IC302 PIN 20, 19, 18 ?
CHECK
IC303
PIN 1, 2, 3 ?
CHECK
IC303 PIN 4 (80V)
PIN 8 (15V) ?
TROUBLE IN
P302 5V LINE
TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE
TROUBLE IN
IC302
TROUBLE IN
P303 15V LINE/
80V LINE
TROUBLE IN IC303
NO
YES
NO
NO
YES
YES
YES
YES
NO
NO
CHECK
R, G, B CATHODE
VOLTAGE?
TROUBLE IN
R341~R343,
R331~R333, L311~L313,
D307~D312
TROUBLE IN
CRT SOCKET
YES
NO

- 16 -
3. NO RASTER
NO VIDEO
(POWER INDICATOR ON)
CHECK
POWER INDICATOR
GREEN or AMBER?
CHECK
D712 ANODE
(-157V)?
CHECK
G1VOLTAGE?
(-55V~-150V)
TROUBLE IN
D712
TROUBLE IN
Q799
DPM MODE
(NO H and/or V SYNC)
AMBER
NO
GREEN
YES
NO
CHECK
CDT HEAT
VOLTAGE? (6.3V)
TROUBLE IN
D941, Q942, Q941
YES
NO
TROUBLE IN
CDT
YES

- 17 -
4. NO HORIZONTAL DEFLECTION
NO H-DEFLECTION
(ONE VERTICAL LINE)
CHECK
Q706?
CHECK
B+ VOLTAGE
(50V)?
CHECK
T701(FBT) PIN 2
(31KHZ 60V,
80KHZ 140V) ?
CHECK
Q701 COLLECTOR
WAVEFORM?
TROUBLE IN
Q706
TROUBLE IN
50V LINE
TROUBLE IN
Q719, Q720, D710
TROUBLE IN
Q701
TROUBLE IN
T701, P701
NO
NO
YES
YES
YES
YES
NO
NO
0V T

- 18 -
5. TROUBLE IN H-LINEARITY
UNBALANCED OF H-LIN.
CHECK
IC401
PIN 5, 6, 7 ,23 ?
CHECK
Q711~Q718?
CHECK
L703?
TROUBLE IN
IC401 (MICOM)
TROUBLE IN
Q711 ~ Q718
TROUBLE IN
L703
TROUBLE IN
C722, C723, C726, C729
NO
NO
NO
YES
YES
YES
Cs SIGNAL TABLE (Normal CDT)
HORIZONTAL
FREQUENCY(fH)
30K ~ 35.9K
36K ~ 40.9K
41K ~ 45.9K
46K ~ 51.9K
52K ~ 58.9K
59K ~ 62.9K
63K ~ 66.9K
67K ~ 73.9K
74K ~ 77.9K
78K ~ 83.9K
84K ~ 86K
Cs1
L
L
H
H
H
H
H
H
H
H
H
Cs0
255
173
85
80
60
50
40
30
20
0
0
Cs3
L
L
L
H
L
L
H
H
H
H
H
Cs4
L
H
H
L
L
H
L
L
H
H
H
Cs2
L
H
L
L
H
H
H
H
H
H
H
Cs SIGNAL TABLE (High brightness)
HORIZONTAL
FREQUENCY(fH)
30K ~ 35.9K
36K ~ 40.9K
41K ~ 45.9K
46K ~ 48.9K
49K ~ 51.9K
52K ~ 58.9K
59K ~ 62.9K
63K ~ 66.9K
67K ~ 73.9K
74K ~ 77.9K
78K ~ 81.9K
82K ~ 83.9K
84K ~ 86K
Cs1
L
L
H
H
H
H
H
H
H
H
H
H
H
Cs0
255
173
85
80
80
60
50
40
30
20
0
0
0
Cs3
L
L
L
H
H
L
L
L
H
H
H
H
H
Cs4
L
H
H
L
L
L
H
H
L
H
H
H
H
Cs2
L
H
L
L
L
H
H
H
H
H
H
H
H

- 19 -
6. NO VERTICAL DEFLECTION
NO V-DEFLECTION
(ONE HORIZONTAL LINE)
CHECK
IC601 PIN 3
(15V)?
CHECK
IC601 PIN 7
(40V)?
CHECK
IC701 PIN 12, 13?
TROUBLE IN
R603 15V LINE
TROUBLE IN
HIGH-VOLTAGE OUT
CIRCUIT(FBT),
D721, R606
TROUBLE IN
IC701
TROUBLE IN
IC601, V-CIRCUIT
NO
NO
YES
YES
YES
NO
3V

- 20 -
7. TROUBLE IN OSD
TROUBLE IN
OSD PERIPHERAL
CIRCUIT
NO OSD
TROUBLE IN
5V LINE
TROUBLE IN
IC601 PIN8 (V-FBP),
T701 40V LINE (H-FBP)
TROUBLE IN
IC302, IC301
TROUBLE IN
IC301, IC302
NO
YES
DC 5V
YES
YES
YES
NO
NO
NO
Pin 5 5V
Pin 10
5V
H+V
5V
H+V
CHECK
IC301 B+
(5V) ?
CHECK
IC301 PIN 12
WAVEFORM ?
(ENTER BUTTON MUST BE PRESSED.)
CHECK
IC301 PIN 5, 10
WAVEFORM?
CHECK
IC301 PIN 13, 14, 15 ?