Failure Analysis Procedure - Hitachi P50X901/DW3-D Service Manual

PANEL TROUBLESHOOTING FLOWCHARTS (50AF1) PANEL:

4.5 FAILURE ANALYSIS PROCEDURE

4.5.1 "No Picture" failure analysis procedure
A
N
A
L
Y
S
I
S
O
P
E
R
A
T
I
O
N
XSUS
CN23
CN22
[XSUS - PSU]
[XSUS - YSUS]
10
Vs
9
Vs
8
Vs
7
NC GND
6
GND
5
GND
4
GND
3
Vcc Vcc
2
NC
1
Va GND
X-SUS to PSU
X-SUS - Y-SUS
The entire screen does not light.
Main Power is turned Off
Remove CN68 and CN64
(on PSU Board)
PSU to LOGIC and X-SUS
Turn on AC Power
PSU board STBY
(5V) exists?
Pin 1 CN63
Turn off AC power.
Connect CN68 to LOGIC.
Turn on AC power
PSU board STBY
(5V) exists?
Pin 1 CN63
Turn off the AC power.
Remove the following five power connectors
CN68, CN26 (X-SUS), CN32 (Y-SUS)
CNR3 (ABUSR), CNL 2 (ABUSL)
X-SUS board
CN23 (3)-(4) pins or
13
-Vs CN23 (8)-(6) pins or
12
-Vs
CN22 (10)-(13) pins
11
NC
10
are shorted?
9
NC
8
Vu
7
NC
6
5
NC
4
3
NC
2
Vs
1
Vs
Y
N
Y
Y
Y
N
(1)
37
PSU board is
defective.
STANDBY power supply
has abnormality
N Logic PWB
defective.
STANDBY power supply (MPU)
power supply system has
short-circuit.
X-SUS board is
defective.
Switching circuit
(Power Supply) has a short-circuit.
Turn off the AC Power,
End of analysis