Power (G Board) Trouble - Sony FWD-42PX2 Service Manual

3-4. Power (G Board) Trouble

Power cannot be turned on.
Is there any trouble in AC power
cable or line filter cable?
No
Is LED reset repeatedly?
No
Is there any abnormal state in
the connection between the
G board and A board.
No
Is the G board abnormal? (*)
No
Is the A board abnormal?
. Check where is short pattern.
. Re-on (2-pin of CN9 on the
A board): High 1 V.
. Vs-on (7-pin of CN9 on the
A board): High 1 V.
No
Replace the CTRL board.
(*)
. 5 Vst (Stand by 5 V, 3, 4-pins of CN9 on the A board):
. AC-DET (1-pin of CN9 on the A board):
. Re-on (Rely-on switching signal, pin-2 of CN9 on the A board): High 1 V
. Vs-on (Vs-on signal, pin-7 of CN9 on the A board):
3-4
n
For the replacement parts, refer to Section 4.
The parts other than those described in Section 4 are
not service parts. When the replacement of those parts
is required, replace them in the assembly unit.
Identify the trouble portion and
Yes
improve it.
There is a high possibility that
Yes
the A board caused the trouble.
→ Replace the A board.
Connect correctly.
Yes
Yes
Replace the G board.
Yes
Replace the A board.
5 V
5 V
High 1 V
n
After replacing the A board, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
. White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
n
After replacing the G board, perform
the following adjustments.
. Va Voltage Adjustment (Refer to Section 2-3.)
. Vs Voltage Adjustment (Refer to Section 2-3.)
n
After replacing the A board, perform the following
adjustments.
. AD calibration adjustment (Refer to Section 2.)
. White balance adjustment (Refer to Section 2.)
. EDID data input
. S-init Goods (Refer to Section 2.)
FWD-42PX2