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Chassis Service Adjustment Procedures
All service adjustments are factory preset and should not require adjustment unless controls and/or
associated components are replaced.
Note:
Connect the (-) lead of the voltmeter to the appropriate ground. Use IC803's heat sink when the HOT ground
symbol ( ) is used. Otherwise, use COLD ground (
IC6501
IC001
TP47R
TP47B
TP47G
TUNER
TPE1
8
1
MOMENTARILY CONNECT A JUMPER FOR ENTERING SERVICE MODE (FA1 to FA2 )
131.0V B+ Voltage Confirmation
1. Set the Bright and the Picture to Minimum by
using the Picture Menu.
2. Connect the DVM between C809(+ side) and cold
ground (
).
3. Confirm that B+ voltage is 131.0V ± 2.5V. This
voltage supplies B+ to the Horizontal Output &
Flyback circuits.
Source Voltage Chart
120V AC line input. Set the Bright and the Picture to
Minimum by using the Picture Menu. Use cold ground
(
) for the (-) lead of the DVM.
LOCATION
TPD8
TPD9
C552 (+) side
IC551 Pin3
D554 Cathode
C572 (+) side
Adjust Picture Menu for normalized video adjustments.
Q002
IC552
C572
IC002
IC2302
1
12
COLD
GND
IC101
TP88
TP12
TPE11
TPE10
IC2201
IC2321
Figure 17. A-Board Main Components and Test Points
VOLTAGE
27.4V ± 2V
13.0V ± 2V
8.0V ± 1V
9.0V ± 0.5V
220V ± 15V
5.0V ± 0.25V
) — Tuner shield, IC451's heat sink or FA2.
D001
IC551
T801
L802
Q802
L803
RL801
Q801
IC803
HOT
GND
TPD8
C551
TPD7
C552
High Voltage Check
1. Select an active TV channel and confirm that
horizontal is in sync.
2. Adjust Brightness and Picture using Picture Icon
menu so video just disappears.
3. Confirm B+ 131V is within limit.
4. Using a high voltage meter confirm that the High
Voltage at the CRT anode is 29.25kV ± 1.25kV.
DVD Voltage Check
Play a DVD TEST DISC and measure the following:
LOCATION
JJ1 pin1 - P2 pin1 (TPJJ5)
JJ1 pin3 - P2 pin3 (TPJJ10)
JJ1 pin5 - P2 pin5 (TPJJ6)
JJ1 pin6 - P2 pin6 (TPJJ7)
W6 pin2 - P1 pin7 (TPW7)
W6 pin4 - P1 pin4 (TPW6)
W6 pin6 - P1 pin6 (TPW5)
W6 pin8 - P1 pin8 (TPW3)
W6 pin10 - P1 pin10 (TPW4)
- 17 -
IC451
1
Q804
13
T502
C809
Q501
T501
Q551
TPD9
T551
D554
FBT
TPD2
Screen Focus
VOLTAGE
-11.0V ± 1V
11.0V ± 1V
5.0V ± 0.25V
5.0V ± 0.25V
2.5V ± 0.125V
2.5V ± 0.125V
5.0V ± 0.25V
9.0V ± 0.45V
5.0V ± 0.25V
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