Sansei TS5129T, Service Manual

Page: 18 / 33

1
9
10
18
E
E
1
9
10
18
E
E
E
34 21
E
E
E
E
E
KG
1LG4B10Y00100
+B(140V)
GND
R461
C436
C61
8A
D654
D593
R423
R420
C655
L654
D661
R661
VR651
+B ADJ.
C651
T611A
R625
Q613
R621
Q625
R622
D618
R628
D614
R619
C614
T611-H3
T611-H5
T611-H6
T611-H7
Q613-H1
Q613-H3 Q613-H2
C609
C607
KK
C606
R629
R
R435
R475
D467
D486
R479
D468
R623
R662
Q661
R663
C658
C629
L651
C643
D469
D466
R441
C468
R435-H1
J110
J111
01
T611
T611
T611AH16
C609-H2 C609-H1
D461 D462
Q662
Q663
D353
J124
D605
D607
J125
L653
J133
Q611
L612
L611
D610
C611
R626
C616
C618
C617 D611
R624
D615
Q612
R627
D616
L615
R631
L614
D612
L613
C615
R617 R616
L616
D619
D622
D623
Q621
R636
R634
R633
R613
Q615
R638 Q642
D617
R632
R611
C612
Q641
R643
R641
C644
L652
R665
R664
R620
J137
J138
R642
R614
D662
R460
D442
R445
D641
C613
J196
R644
R490
T611AH17
T611AH13
T611AH12
T611AH11
R441-H1
JW1
R635
R637
JW12
R441-H
R615
J109
J130
R442-H1
T611-H8
D476
J230
C620
C619
C621
JWM
JWMM
C639
T611
CONVERTET
TRANS.
E
1
6
R525
C425A
C424A
T471-H10
T471-H9
T471-H7
T471-H6
T471-H5
T471-H4
T471-H1 T471-H2
C432
C433
T431
Q431
L431
C424
C425
D438
C434
R433
D439
C423-H1
C420-H1 C420-H2
T471-H8
T431-H3 T431-H2
T431-H4 T431-H1
KSC
R481
R488
C491
C486
C465
62-H1
L462
J103
J105
C524 D441
Q432-H8
Q432-H4
Q432
Q432-H5
Q432-H7
Q432-H2 Q432-H3
Q432-H1
L432
J106
R517
D507
C515A
T471
2-H2 2
R241
J114
J115
J116
KDY
23
KDY-H1
KDY-H3
KDY-H6
C420
R524
42
T471-H11
R528
R488A
J221
R481-H1
R481-H2
T471
FBT
-18-
Service Adjustments
Service Adjustment-4
1. Receive the monochrome circular pattern.
2. Set the brightness to normal and contrast to maximum.
3. Adjust the focus control on the F.B.T. for the best focus
on the screen centre.
FOCUS ADJUSTMENT
FOCUS VR (Upper side)
1. Connect a DC voltmetre to J110 and the ground.
Set the +B adjustment control (VR651) to middle range.
2. Set the brightness to normal and contrast to maximum.
3. Tune the receiver to an active channel and synchro-
nized picture.
4. B voltage to 140± 1.0 volt DC by using VR651.
+B POWER SUPPLY ADJUSTMENT
VR651
J110
MAIN BOARD
This TV set has a built-in power supply protection circuit.
It is provided to protect the TV set in case of a power
supply circuit malfunctions. When something abnormality
occurs during TV reception, the TV set goes to the stand-
by mode.
When an abnormality occurs during TV reception, it
causes pin 27 of the CPU to go continually Low volt-
age for about one second. The CPU detects that this
has occurred and outputs the signal from pin 31 to
switch off the power supply lines.
Releasing the protective circuit and restor-
ing power supply
To release the protective circuit and restore power supply,
turn the power to the TV set OFF and then ON again via
either the main power switch or the ON-OFF button on the
remote control. This will work only if the power supply trou-
ble was temporary. If there is permanent trouble such as a
damaged circuit, power cannot be restored and the circuit
will have to be repaired.
Protection Circuit
Note: +B (+140V) Voltage and Grayscale Adjustment must be
completed before attempting High Voltage Check.
1. Connect high voltage voltmeter negative lead to
ground, and c lead to anode of picture tube.
2. Tune receiver to an active channel and confirm TV is
operating properly.
3. The high voltage must be 29.5KV ± 1.5KV and less than
32KV at 0 beam current (Brightness and contrast
minimum setting).
Note: If the picture tube is replaced, check the high
voltage.
HIGH VOLTAGE CHECK