Insignia IS-TV040923 User manual
SERVICE MANUAL
IS-TV040923
S/M CODE NO. M3T111DASM
DATE OF ISSUE 3/2005
COLOR TELEVISION RECEIVER
ORIGINAL
VERSION (A)
All the specifications and features are subject to change without notice.
A1-1
A2-1
A3-1~A3-4
B1-1
B2-1, B2-2
C-1
C-1
C-1
D-1~D-5
E-1~E-5
F-1, F-2
G-1
H-1, H-2
I-1~I-4
J-1, J-2
J-3, J-4
J-5, J-6
J-7, J-8
J-9, J-10
K-1, K-2
L-1
M1-1
M1-1
M2-1~M2-3
TABLE OF CONTENTS
A1-1
TABLE OF CONTENTS...................................................................................................................................
IMPORTANT SERVICE SAFETY INFORMATION .........................................................................................
GENERAL SPECIFICATIONS ........................................................................................................................
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP .................................................................................................................
2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ...................................................................
SERVICE MODE LIST.....................................................................................................................................
CONFIRMATION OF HOURS USED ..............................................................................................................
WHEN REPLACING EEPROM (MEMORY) IC ...............................................................................................
ELECTRICAL ADJUSTMENTS.......................................................................................................................
TROUBLESHOOTING GUIDE.........................................................................................................................
IC DESCRIPION...............................................................................................................................................
SEMICONDUCTOR BASE CONNECTIONS...................................................................................................
BLOCK DIAGRAM ...........................................................................................................................................
PRINTED CIRCUIT BOARDS
MAIN/CRT....................................................................................................................................................
SCHEMATIC DIAGRAMS
MICON/CHROMA/TUNER...........................................................................................................................
DEFLECTION/CRT ......................................................................................................................................
POWER.......................................................................................................................................................
SOUND........................................................................................................................................................
AV......................................................................................................................................................... ...... .
WAVEFORMS ..................................................................................................................................................
MECHANICAL EXPLODED VIEW ...................................................................................................................
MECHANICAL REPLACEMENT PARTS LIST ...............................................................................................
ACCESSORY REPLACEMENT PARTS LIST.................................................................................................
ELECTRICAL REPLACEMENT PARTS LIST .................................................................................................
IMPORTANT SERVICE SAFETY INFORMATION
Operating the receiver outside of its cabinet or with its
back removed involves a shock hazard. Work on
these models should only be performed by those who
are thoroughly familiar with precautions necessary
when working on high voltage equipment.
Exercise care when servicing this chassis with power
applied. Many B plus and high voltage RF terminals are
exposed which, if carelessly contacted, can cause
serious shock or result in damage to the chassis.
Maintain interconnecting ground lead connections
between chassis, escutcheon, picture tube dag and
tuner cluster when operating the chassis.
These receivers have a "polarized" AC line cord. The AC
plug is designed to fit into standard AC outlets in one
direction only. The wide blade connects to the "ground
side" and the narrow blade connects to the "hot side" of
the AC line. This assures that the TV receiver is properly
grounded to the house wiring. If an extension cord must
be used, make sure it is of the "polarized" type.
Since the chassis of this receiver is connected to one
side of the AC supply during operation, service should
not be attempted by anyone not familiar with the
precautions necessary when working on these types
of equipment.
When it is necessary to make measurements or tests with
AC power applied to the receiver chassis, an Isolation
Transformer must be used as a safety precaution and to
prevent possible damage to transistors. The Isolation
Transformer should be connected between the TV line
cord plug and the AC power outlet.
Certain HV failures can increase X-ray radiation.
Receivers should not be operated with HV levels
exceeding the specified rating for their chassis type. The
maximum operating HV specified for the chassis used in
these receivers is 33.0kV±1.0kV at zero beam current
with a line voltage of 120V AC. Higher voltage may also
increase the possibility of failure in the HV supply.
It is important to maintain specified values of all
components in the horizontal and high voltage circuits
and anywhere else in the receiver that could cause a rise
in high voltage, or operating supply voltages. No changes
should be made to the original design of the receiver.
Components shown in the shaded areas on the
schematic diagram and/or identified by in the
replacement parts list should be replaced only with
exact factory recommended replacement parts. The
use of unauthorized substitute parts may create
shock, fire, X-ray radiation, or other hazards.
To determine the presence of high voltage, use an
accurate high impedance HV meter connected
between the second anode lead and the CRT dag
grounding device. When servicing the High Voltage
System, remove static charges from it by connecting a
10k ohm resistor in series with an insulated wire (such
as a test probe) between the picture tube dag and 2nd
anode lead (have AC line cord disconnected from AC
supply).
The picture tube used in this receiver employs integral
implosion protection. Replace with a tube of the same
type number for continued safety. Do not lift picture
tube by the neck. Handle the picture tube only when
wearing shatterproof goggles and after discharging the
high voltage completely. Keep others without
shatterproof goggles away.
When removing springs or spring mounted parts from the
tuner, tuner cluster or chassis, shatterproof goggles must
be worn. Keep others without shatterproof goggles away.
Before returning the receiver to the user, perform the
following safety checks:
1.
2.
3.
Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the receiver.
Replace all protective devices such as nonmetallic
control knobs, insulating fishpapers, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
To be sure that no shock hazard exists, a check for
the presence of leakage current should be made at
each exposed metal part having a return path to the
chassis (antenna, cabinet metal, screw heads,
knobs and/or shafts, escutcheon, etc.) in the
following manner.
Plug the AC line cord directly into a 120V AC receptacle.
(Do not use an Isolation Transformer during these
checks.) All checks must be repeated with the AC line
cord plug connection reversed. (If necessary, a
nonpolarized adapter plug must be used only for the
purpose of completing these checks.)
If available, measure current using an accurate leakage
current tester. Any reading of 0.35mA or more is
excessive and indicates a potential shock hazard which
must be corrected before returning the receiver to the
owner.
If a reliable leakage current tester is not available, this
alternate method of measurement should be used.
Using two clip leads, connect a 1500 ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series with
a known earth ground, such as a water pipe or conduit
and the metal part to be checked. Use a VTVM or
VOM with 1000 ohms per volt, or higher, sensitivity to
measure this AC voltage drop across the resistor. Any
reading of 0.35 volt RMS or more is excessive and
indicates a potential shock hazard which must be
corrected before returning the receiver to the owner.
TO EXPOSED
METAL PARTS TO KNOWN
EARTH GROUND
AC SCALE
VT VM
1.5K OHMS
10W
15µF
TEST PROBE
A2-1
GENERAL SPECIFICATIONS
G-1 TV CRT CRT Size / Visual Size 27 inch / 676.0mmV
System CRT Type Normal
Magnetic Field BV/BH +0.45G/0.18G
Color System NTSC
Speaker 2Speaker
Position Front
Size 2.0 x 3.5 Inch
Impedance 8 ohm
Sound Output MAX 2.5 + 2.5 W
10%(Typical) - W
NTSC3.58+4.43 /PAL60Hz No
G-2 Tuning Broadcasting System US System M
System Tuner and System 1Tuner
Receive CH Destination USA(W/ CATV)
2 - 69, 4A, A-5 - A-1,
CH Coverage A - I, J - W, W+1 - W+84
Intermediate Picture(FP) 45.75MHz
Frequency Sound(FS) 41.25MHz
FP-FS 4.50MHz
Preset CH No
Stereo/Dual TV Sound Yes
Tuner Sound Muting Yes
G-3 Power Power Source AC 120V AC 60Hz
DC
Power Consumption at AC 125 W at AC 120 V 60 Hz
Stand by (at AC) 5 W at AC 120 V 60 Hz
Per Year -- kWh/Year
Protector Power Fuse Yes
Safety Circuit Yes
IC Protector(Micro Fuse) No
G-4 Regulation Safety UL/CSA
Radiation FCC/IC
X-Radiation DHHS/HWC
G-5 Temperature Operation +
5
o
C
~ +4
0
o
C
Storage -2
0
o
C
~ +
60
o
C
G-6 Operating Humidity Less than 80% RH
G-7 On Screen Menu Yes
Display Menu Type Character
Picture Yes
Contrast Yes
Brightness Yes
Color Yes
Tint Yes
Sharpness Yes
Audio Yes
Bass No
Treble No
Balance No
BBE On/Off No
Stable Sound On/Off Yes
Surround On/Off No
CH Set Up Yes
TV/CATV Yes
Auto CH Memory Yes
Add/Delete Yes
Language Yes
V-chip Yes
CH Label No
Favorite CH No
Color Stream DVD/DTV No
Control Level Yes
Volume Yes
Brightness Yes
Contrast Yes
Color Yes
Tint Yes
Sharpness Yes
Tuning No
Bass No
Treble No
Balance No
A3-1
GENERAL SPECIFICATIONS
Back Light No
Stereo,Audio Output,SAP Yes
Video Yes
Color Stream No
Channel(TV/Cable) Yes
CH Label No
Sleep Timer Yes
Sound Mute Yes
V-chip Rating Yes
G-8 OSD Language English French Spanish
G-9 Clock and Sleep Timer Max Time 120 Min
Timer Step 10 Min
On/Off Timer Program(On Timer / Off Timer) No
Wake Up Timer No
Timer Back-up (at Power Off Mode) more than -- Min Sec
G-10 Remote Unit RC-DW
Control Glow in Dark Remocon No
Format NEC
Remocon Format Orion
Custom Code 86-05 h
Power Source Voltage(D.C) 3V
UM size x pcs UM-4 x 2 pcs
Total Keys 28 Keys
Keys Power Yes
1 Yes
2 Yes
3 Yes
4 Yes
5 Yes
6 Yes
7 Yes
8 Yes
9 Yes
0 Yes
100 No
CH Up Yes
CH Down Yes
Volume Up Yes
Volume Down Yes
TV/Caption/Text Yes
CH1/CH2 Yes
TV/Video(TV/AV) Yes
CH RTN/CH ENT(Quick View) Yes
Sleep Yes
RE Call(Call) Yes
Reset Yes
Menu Yes
Enter Yes
Mute Yes
Exit No
MTS(Audio Select) Yes
Set + Yes
Set - Yes
Multi Brand Keys CH Up(VCR) No
CH Down(VCR) No
Pause/Still No
TV/VCR(VCR) No
Code No
CH Enter No
MBR Set No
FF No
Rew No
Rec No
Play No
Stop No
TV No
VCR No
Cable No
G-11 Features Auto Degauss Yes
Auto Shut Off Yes
Canal+ No
A3-2
GENERAL SPECIFICATIONS
CATV Yes
Anti-theft No
Rental No
Memory(Last CH) Yes
Memory(Last Volume) Yes
V-Chip Yes
Type USA, ORION Type
BBE No
Auto Search No
CH Allocation No
SAP Yes
Tone Control No
Channel Lock No
Just Clock Function No
Game Position No
CH Label No
VM Circuit No
Full OSD No
Premiere No
Comb Filter No
Lines
Auto CH Memory Yes
Hotel Lock No
Closed Caption Yes
Stable Sound Yes
Surround No
Energy Star No
Power On Memory No
Favorite CH No
G-12 Accessories Owner's Manual Language English / French / Spanish
w/Guarantee Card No
Remote Control Unit Yes
Rod Antenna No
Poles
Terminal
Loop Antenna No
Terminal
U/V Mixer No
DC Car Cord (Center+) No
Guarantee Card Yes
Warning Sheet No
Circuit Diagram No
Antenna Change Plug No
Service Facility List No
Important Safeguard No
Dew/AHC Caution Sheet No
AC Plug Adapter No
Quick Set-up Sheet No
Battery No
UM size x pcs
OEM Brand No
AC Cord No
AV Cord (2Pin-1Pin) No
Registration Card No
Information Sheet No
PTB Sheet No
300 ohm to 75 ohm Antenna Adapter No
G-13 Interface Switch Front Power Yes
System Select No
Main Power SW No
Sub Power No
Channel Up/Reset Yes
Channel Down/Enter Yes
Volume Up/Set Up Yes
Volume Down/Set Down Yes
Menu: Vol Up + Vol Down Yes
Rear AC/DC No
TV/CATV Selector No
Degauss No
Main Power SW No
Indicator Power No
Stand-by No
A3-3
GENERAL SPECIFICATIONS
On Timer No
Terminals Front Video Input RCA
Audio Input RCA x 2
Other Terminal No
Rear Video Input(Rear1) RCA
Video Input(Rear2) No
Audio Input(Rear1) RCA x 2
Audio Input(Rear2) No
Video Output No
Audio Output No
S-Input Yes
Color Stream No
Diversity No
Ext Speaker No
DC Jack 12V(Center +) No
VHF/UHF Antenna Input F Type
AC Outlet No
G-14 Set Size Approx. W x D x H (mm) 650 x 500.5 x 571.5
G-15 Weight Net (Approx.) 36.5kg ( 80.5 lbs)
Gross (Approx.) 40.5Kg (89.3 lbs)
G-16 Carton Master Carton No
Content ---- Sets
Material -- /--
Dimensions W x D x H(mm) -- x -- x --
Description of Origin No
Gift Box Material Double/Brown
Dimensions W x D x H(mm) 731 x 580 x 665
Design As per Buyer's
Description of Origin Yes
Drop Test Natural Dropping At 1 Corner / 3 Edges / 6
Surfaces
Height (cm) 31
Container Stuffing 192 Sets/40' container
G-17 Material Cabinet Cabinet Front PS 94V0 DECABROM
Cabinet Rear PS 94V0 DECABROM
PCB Non-Halogen Demand No
Eyelet Demand No
G-18 Environment Pb-free Soldering No
Parts Specifica
t
No
A3-4
1. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work.
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.
Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 1-1.)
Connect one end of an Alligator Clip to the metal part of
a flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated screwdriver,
touch the support of the Anode with the tip of the
screwdriver.
A cracking noise will be heard as the voltage is discharged.
Flip up the sides of the Rubber Cap in the direction of the
arrow and remove one side of the support.
(Refer to Fig. 1-2.)
2.
GND on the CRT
Screwdriver
Alligator Clip
Support CRT
GND on the CRT
Rubber Cap
CRT Support
Fig. 1-2
3. After one side is removed, pull in the opposite direction to
remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 1-3.)
Location of Anode Cap
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.
3.
Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 1-4.)
4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 1-5.
5.
6. Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
CRT Support
DISASSEMBLY INSTRUCTIONS
Fig. 1-3
Fig. 1-4
Fig. 1-5
*
*
Fig. 1-1
B1-1
B2-1
Masking Tape
(Cotton Tape)
DISASSEMBLY INSTRUCTIONS
2.
REMOVAL
IC
Put Masking Tape (cotton tape) around the Flat Package
IC to protect other parts from any damage.
(Refer to Fig. 2-1.)
1.
Fig. 2-1
NOTE
REMOVAL AND INSTALLATION OF
FLAT PACKAGE IC
Some ICs on the PCB are affixed with glue, so be
careful not to break or damage the foil of each IC
leads or solder lands under the IC when removing it.
NOTE
Masking is carried out on all the parts located within
10 mm distance from IC leads.
Blower type IC
desoldering machine
IC
Heat the IC leads using a blower type IC desoldering
machine. (Refer to Fig. 2-2.)
2.
Fig. 2-2
NOTE
Do not rotate or move the IC back and forth until IC
can move back and forth easily after desoldering the
leads completely.
When IC starts moving back and forth easily after
desoldering completely, pickup the corner of the IC using
a tweezers and remove the IC by moving with the IC
desoldering machine. (Refer to Fig. 2-3.)
3.
Blower type IC
desoldering
machine
IC Fig. 2-3
Tweezers
Peel off the Masking Tape.4.
Absorb the solder left on the pattern using the Braided
Shield Wire. (Refer to Fig. 2-4.)
5.
NOTE
Do not move the Braided Shield Wire in the vertical
direction towards the IC pattern.
Braided Shield Wire
Soldering Iron
Fig. 2-4
IC pattern
B2-2
DISASSEMBLY INSTRUCTIONS
Supply soldering
from upper position
to lower position
IC
Supply the solder from the upper position of IC leads
sliding to the lower position of the IC leads.
(Refer to Fig. 2-6.)
2.
Fig. 2-6
Soldering IronSolder
IC
Absorb the solder left on the lead using the Braided
Shield Wire. (Refer to Fig. 2-7.)
3.
Fig. 2-7
Soldering Iron
Braided Shield Wire
NOTE
Do not absorb the solder to excess.
IC
When bridge-soldering between terminals and/or the
soldering amount are not enough, resolder using a Thin-
tip Soldering Iron. (Refer to Fig. 2-8.)
4.
Fig. 2-8
Thin-tip Soldering Iron
NOTE
When the IC leads are bent during soldering and/or
repairing, do not repair the bending of leads. If the
bending of leads are repaired, the pattern may be
damaged. So, be always sure to replace the IC in this
case.
Finally, confirm the soldering status on four sides of the
IC using a magnifying glass.
Confirm that no abnormality is found on the soldering
position and installation position of the parts around the
IC. If some abnormality is found, correct by resoldering.
5.
Solder temporarily
Soldering Iron
INSTALLATION
Take care of the polarity of new IC and then install the
new IC fitting on the printed circuit pattern. Then solder
each lead on the diagonal positions of IC temporarily.
(Refer to Fig. 2-5.)
1.
Fig. 2-5
Solder temporarily
SERVICE MODE LIST
This unit is provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter to the Service Mode, press both set key and remote control key for more than 2seconds.
Set Key Remocon Key Operations
VOL. (-) MIN 0Releasing of V-CHIP PASSWORD and LOCK PASSWORD.
VOL. (-) MIN 1 Initialization of factory data.
NOTE: Do not use this for normal servicing.
If you set factory initialization, the memories are reset such as the clock
setting, the channel setting, the POWER ON total hours, and PLAY/REC
total hours.
VOL. (-) MIN 6
POWER ON total hours is displayed on the screen.
Refer to the "CONFIRMATION OF HOURS USED".
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".
VOL. (-) MIN 9 Display of the Adjustment MENU on the screen.
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
CONFIRMATION OF HOURS USED
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
NOTE: If you set factory initialization, the total hours is reset to "0".
1.
2.
3.
Set the VOLUME to minimum.
Press both VOL. DOWN button on the set and Channel
button (6)on the remote control for more than 2 seconds.
After the confirmation of using hours, turn off the power.
FIG. 1
Initial setting content of MEMORY IC.
POWER ON total hours.
= (16 x 16 x 16 x thousands digit value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)
ADDRESS DATA
INIT 00 10
CRT ON 0010
WHEN REPLACING EEPROM (MEMORY) IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.
Table 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Enter DATA SET mode by setting VOLUME to minimum.
While holding down VOLUME button on front cabinet, press key 6 on remote control for more than 2 seconds.
ADDRESS and DATA should appear as FIG 1.
ADDRESS is now selected and should "blink". Using the VOL. +/- button on the remote, step through the ADDRESS until
required ADDRESS to be changed is reached.
Press ENTER to select DATA. When DATA is selected, it will "blink".
Again, step through the DATA using VOL. +/- button until required DATA value has been selected.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
Repeat steps 3 to 6 until all data has been checked.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
After the data input, set to the initializing of shipping.
Turn POWER on.
While holding down VOLUME button on front cabinet, press key 1 on remote control for more than 2seconds.
After the finishing of the initializing of shipping, the unit will turn off automatically.
10 04 4A 4C 57 B3 24 7B 03 02
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F
INI
00 CC 50 D4 3F 00 03
C-1
ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
Use an isolation transformer when performing any
service on this chassis.
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
When you exchange IC and Transistor with a heat sink,
apply silicon grease (YG6260M) on the contact section
of the heat sink. Befor applying new silicon grease,
remove all the old silicon grease. (Old grease may
cause damages to the IC and Transistor.)
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Multi-sound Generator
4. Pattern Generator
On-Screen Display Adjustment
1. In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than 2
secondsto appear the adjustment mode on the screen as
shown in Fig. 1-1.
Fig. 1-1
TV
00 OSD 17
2.
3.
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
Press the MENU button on the remote control to end the
adjustments.
2. BASIC ADJUSTMENTS
2-1: CONSTANTVOLTAGE
1.
2.
3.
Place the set in AV MODE without signal.
Connect the digital voltmeter to the TP401.
Adjust the VR502 until the digital voltmeter is 120 ±0.5V.
•
•
•
•
2-2: CUT OFF
1.
2.
3.
4.
5.
Place the set in Aging Test for more than 15 minutes.
Place the set in AV MODE without signal.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select “CUT OFF”.
Adjust the Screen Volume until a dim raster is obtained.
FUNCTION
OSD H
CUT OFF
H.VCO
H.PHASE
V.SIZE
V.SHIFT
R.DRIVE
B.DRIVE
R.BIAS
G.BIAS
B.BIAS
BRIGHT CENT
BRIGHT MAX
BRIGHT MIN
NO.
00
01
04
05
06
07
08
09
10
11
12
13
14
15
Fig. 1-2
FUNCTION
CONTRAST CENT
CONTRAST MAX
CONTRAST MIN
COLOR CENT
COLOR MAX
COLOR MIN
TINT
SHARPNESS
FM LEVEL
LEVEL
SEPARATION 1
SEPARATION 2
TEST MONO
TEST STEREO
NO.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
2-3: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
Place the set in Aging Test for more than 15 minutes.
Receive the white 100% signal from the Pattern
Generator.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (10) on the remote control to
select "R.BIAS".
Using the VOL. UP/DOWN button on the remote control,
adjust the R.BIAS.
Press the CH. UP/DOWN button on the remote control to
select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
Using the VOL. UP/DOWN button on the remote control,
adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS.
Perform the above adjustments 6 and 7 until the white
color is achieved.
1.
2.
3.
4.
5.
6.
7.
8.
2-4: FOCUS
1.
2.
3.
Receive the monoscope pattern.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-5:VERTICAL POSITION
1.
2.
3.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Adjust the VR401 until the horizontal line becomes fit to
the notch of the shadow mask.
(Refer to Fig. 2-1)
Fig. 2-1
Shadow mask
Notch
horizontal line
,,
,,
,,
,,
,,
,,
,,
,
D-1
ELECTRICAL ADJUSTMENTS
2-11: SEPARATION 1, 2
Please do the method (1) or method (2) adjustment.
Method (1)
1.
2.
3.
4.
5.
Set the multi-sound signal generator for each different L-ch
and R-ch frequency (Ex. L-ch=2KHz, R-ch=400Hz)
and receive the RF.
Connect the oscilloscope to the pin 6 and pin 7 of CP601.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select “SEP 1”.
Press the VOL. UP/DOWN button on the remote control
to adjust it until the audio output wave becomes a fine
sine wave.
Press the CH UP button once the set to “SEP 2” mode.
Then perform the above adjustment 4.
Method (2)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set the multi-sound signal generator L-ch=1KHz, R-ch
=Non input and receive the RF.
Connect the oscilloscope to the pin 6 and pin 7 of CP601.
Press the AUDIO SELECT button on the remote control
to set to the stereo mode.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (26) on the remote control to
select “SEP 1”.
Press the VOL. UP/DOWN button on the remote control
to adjust it until the R-ch output becomes minimum.
Set the multi-sound signal generator L-ch=Non input,
R-ch=1KHz and receive the RF.
Connect the oscilloscope to the pin 6 and pin 7 of CP601.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (27) on the remote control to
select “SEP 2”.
Press the VOL. UP/DOWN button on the remote control
to adjust it until the L-ch output becomes minimum.
The output difference of the between with Filter and
without Filter should be more than 20db for both L and R.
2-9: HORIZONTAL PHASE
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast to
normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (05) on the remote control to
select “H.PHASE”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
left becomes minimum.
2-6:VERTICAL SIZE
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (06) on the remote control to
select “V. SIZE”.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes 9 ±2%.
2-7:VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-6.
After the adjustment of Vertical Linearity, reconfirm
the Vertical Position and Vertical Size adjustments.
Receive the monoscope pattern.
Using the remote control, set the brightness, contrast,
to normal position.
Adjust the VR402 until the SHIFT quantity of the OVER
SCAN on upside and downside becomes minimum.
1.
2.
3.
2-8: LEVEL
1.
2.
3.
Connect the AC voltmeter to pin 6 of CP601.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (25) on the remote control to
select “LEVEL”.
Press the VOL. UP/DOWN button on the remote control
until the AC voltmeter is 85±2mV.
1.
2.
3.
4.
5.
6.
7.
2-10: CONTRAST MAX
Receive an over 70dB color bar pattern. (RF Input)
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (17) on the remote control
to select "CONT MAX".
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "70".
Receive a broadcast and check if the picture is normal.
Receive the color bar pattern. (Audio Video Input)
Press the TV/VIDEO button on the remote control to
set to the AV mode. Then perform the above
adjustments 2~5.
2-12: OSD POSITION
1.
2. Activate the adjustment mode display of Fig. 1-1.
Press the VOL. UP/DOWN button on the remote
control until the difference of A and B becomes
minimum. (Refer to Fig. 2-2)
BA
TV
00 OSD 10
Fig. 2-2
D-2
ELECTRICAL ADJUSTMENTS
2-13: BRIGHT CENT
1.
2.
3.
4.
5.
6.
Receive the monoscope pattern. (RF Input)
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "BRI CENT".
Press the VOL. UP/DOWN button on the remote control
until the white 10% is starting to be visible.
Receive the monoscope pattern. (Audio Video Input)
Press the TV/VIDEO button on the remote control to set
to the AV mode. Then perform the above adjustments
2~4.
2-14: COLOR CENT
1.
2.
3.
4.
5.
6.
7.
8.
Receive the color bar pattern. (RF Input)
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Connect the oscilloscope to TP022.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (19) on the remote control to
select "COLOR CENT".
Adjust the VOLTS RANGE VARIABLE knob of the
oscilloscope until the range between white 100% and
0% is set to 4 scales on the screen of the oscilloscope.
Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 120 ±5% of the
white level. (Refer to Fig. 2-3)
Receive the video color bar pattern. (Audio Video Input)
Set to the AV mode. Then perform the above
adjustments 2~6.
Fig. 2-3
120%
white 100%
2-15: TINT
1.
2.
3.
4.
5.
6.
7.
Receive the color bar pattern. (RF Input)
Using the remote control, set the brightness, contrast,
color and tint to normal position.
Connect the oscilloscope to TP024.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "TINT".
Press the VOL. UP/DOWN button on the remote control
until the section "A" becomes as straight line.
(Refer to Fig. 2-4)
Receive the video color bar pattern. (Audio Video Input)
Set to the AV mode. Then perform the above adjustments
2~5.
Fig. 2-4
2-16: HORIZONTAL SIZE
1.
2.
3.
Receive the monoscope pattern.
Using the remote control, set the brightness and
contrast to normal position.
Adjust the VR404 until the SHIFT quantity of the
OVER SCAN on the right and left becomes 10 ±4%.
2-17: PALABOLA CORR
1.
2.
3.
Receive the chosshatch pattern.
Using the remote control, set the brightness and
contrast to normal position.
Adjust the VR403, so that the 4th length line becomes
straight from the outside of the right and left.
Please check if the fixed values of the each adjustment
items are set correctly referring below.
2-18: Confirmation of FixedValue (step No.)
NO.
04
07
14
15
16
18
20
21
23
24
FUNCTION
H VCO
V.SHIFT
BRIGHT MAX
BRIGHT MIN
CONT CENT
CONT MIN
COLOR MAX
COLOR MIN
SHARPNESS
FM LEVEL
RF
04
02
130
60
35
25
75
00
45
01
AV
04
02
130
60
35
25
75
00
45
01
“A”
D-3
ELECTRICAL ADJUSTMENTS
3-3: STATIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-2.
1.
2.
3.
Receive the crosshatch pattern from the color bar
generator.
Combine red and blue of the 3 color crosshatch
pattern on the center of the screen by adjusting the pair
of 4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
3-4: DYNAMIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-3.
1.
2.
Adjust the differences around the screen by moving the
deflection yoke upward/downward and right/left.
(Refer to Fig. 3-2-a)
Insert three wedges between the deflection yoke and
CRT funnel to fix the deflection yoke.
(Refer to Fig. 3-2-b)
R G B
R
G
BR
G
B
R G B
UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT
Fig. 3-2-a
WEDGE WEDGE
WEDGE
WEDGE POSITION
Fig. 3-2-b
DEFLECTION YOKE SCREW
3. PURITY AND CONVERGENCE
ADJUSTMENTS
NOTE
1.
2.
3.
Turn the unit on and let it warm up for at least 30
minutes before performing the following adjustments.
Place the CRT surface facing east or west to reduce the
terrestrial magnetism.
Turn ON the unit and demagnetize with a Degauss Coil.
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
1.
2.
3.
4.
5.
6.
7.
8.
Tighten the screw for the magnet. Refer to the adjusted
CRT for the position. (Refer to Fig. 3-1)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
Receive the green raster pattern from the color bar
generator.
Slide the deflection yoke until it touches the funnel side
of the CRT.
Adjust center of screen to green, with red and blue on
the sides, using the pair of purity magnets.
Switch the color bar generator from the green raster
pattern to the crosshatch pattern.
Combine red and blue of the 3 color crosshatch
pattern on the center of the screen by adjusting the pair
of 4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
Adjust the crosshatch pattern to change to white by
repeating steps 6 and 7.
3-2: PURITY
NOTE
Adjust after performing adjustments in section 3-1.
1.
2.
3.
4.
5.
Receive the green raster pattern from color bar genera-
tor.
Adjust the pair of purity magnets to center the color on
the screen.
Adjust the pair of purity magnets so the color at the ends
are equally wide.
Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole screen
is green.
Confirm red and blue color.
Adjust the slant of the deflection yoke while watching the
screen, then tighten the fixing screw.
DEFLECTION YOKE
MAGNET SCREW
PURITY MAGNETS
6 POLE MAGNETS
4 POLE MAGNETS
Fig. 3-1
D-4
MAIN PCB
CRT PCB
CP802B CP803B
TP024
TP022
J801
CP806_1
R805
R803
CP801
VR402
VR404
SPEAKER
CD1001
CP1001
DEGAUSS COIL
CP502
CRT
CD802
VR502
VR401
S501A
FB401
CP803A
VR403
J701 J705
W130
CP601
S501B
TP401
TU001
CP802A
J712
J711
J710
CD501
CD803
CD801
CP401
CRT
ELECTRICAL ADJUSTMENTS
4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION)
D-5
TROUBLESHOOTING GUIDE
E-1
NO POWER
Yes
Is the voltage at the point (A)
in the Figure DC144V ? Is the voltage at pin G
of Q501 DC5V ? Yes
No
Check R501 and check associated
circuit.
Check the rectifying circuit.
Yes
No
Yes
No
Is the voltage at the point (B)
in the Figure DC164V ?
Is the voltage at the point (C)
in the Figure AC120V ?
Yes
No
Broken wire of L501.
Is the voltage on both
ends of S501 AC120V ? Broken wire of F501.
Yes
No
Broken wire of AC cord or check
S501.
Is the voltage at the point (E)
in the Figure AC120V ?
Check Q501 and associated circuit.
Check Q502 and associated circuit.
No
T502
58
A
D
S
G
3
Q502
Q501
IC501
R503 R501
B
D501~D504
L501
C
E
F501
S501
CD501
TROUBLESHOOTING GUIDE
E-2
Is the heater voltage at
pin 10 of J801 AC6.4V ?
Is the high voltage of
ANODE 27KV~28KV ?
No
NO RASTER
Does the RASTER
appear at maximum
BRIGHT/CONTRAST ?
Yes
No
Is the voltage of pin 4 of
CP803 DC184V ? Yes
No
Check the output circuit and
associated circuit.
Check the 180V line.
Yes Yes
No
Contact defects of CRT or CRT
Socket.
Check the HEATER circuit.
Yes
No
Is collector voltages
of Q401 DC114V and
Q402 DC27V ? Check FB401 and associated circuit.
No
Yes
Is the waveform at base
of Q401 normal ?
No
Yes
Is the waveform at pin
46 of IC101 normal ? Check the circuit from pin 46 of
IC101 to Q402.
Check IC101 and associated circuit.
Check Q402 and associated circuit.
TROUBLESHOOTING GUIDE
E-3
NO COLOR
Are the waveforms at pin 6,
8 and 11 of J801 normal ? Yes
No
Defect of CRT or contact defects
of J801.
Are the waveforms at pin 3,
4 and 5 of CP802 normal ? Yes
No
Check the output circuit and
associated circuit.
Are the waveforms at
pin 50, 51 and 52 of
IC101 normal ?
Yes
No
Check R, G, B signal output from
IC101 to R, G, B output circuit.
Is the pulse of crystal
X601 normal ?
No
Yes Check the associated circuit of IC101.
Check X601.
TROUBLESHOOTING GUIDE
E-4
NO VERTICAL
Is the waveform at pin
6 of CP401 normal ? Yes
No
Check DY.
Is the waveform at pin
5 of IC401 normal ? Yes
No
Check the circuit from pin 5 of
IC401 to CP401.
Is the waveform at pin 7
of IC401 normal ? Yes
No
Is the waveform at pin
2 of IC401 normal ? Yes
No
Check IC401 and check
associated circuit.
Check the 25V line.
Is the waveform at pin
38 of IC101 normal ?
No
Yes
Check the associated circuit of IC101.
Check the circuit from pin 38 of
IC101 to pin 7 of IC401.
Other manuals for IS-TV040923
1
Table of contents
