Hitachi P50H401/DW3-U Service Manual page 129

TROUBLESHOOTING THE 50AE1 PANEL
4.6 FAILURE ANALYSIS PROCEDURE
4.6.2 "The entire screen does not light (No Picture)" Problem analysis procedure
XSUS
CN23
CN22
[XSUS - PSU]
[XSUS - YSUS]
10
13
Vs
-Vs
12
Vs
-Vs
11
Vs
NC
10
NC
GND
9
GND
NC
8
GND
Vu
7
GND
NC
6
Vcc
Vcc
5
NC
NC
4
Va
GND
3
NC
2
Vs
1
Vs
The entire screen does not light.
(Main power is off.)
Y
Remove CN6
(on LOGIC Board,
PSU-LOGIC cable)
Turn on AC power.
PSU board Vpr2
(3.3V) exists?
Y
Turn off AC power.
Connect CN 6 (LOGIC).
Turn on AC power
PSU board
Vpr2 (3.3V) exists?
Y
Turn off the AC power.
Remove the following power connectors
(five locations):
CN 23, CN26 (X-SUS), CN 32 (Y-SUS)
CNR3 (ABUSR), CNL 2 (ABUSL)
X-SUS board
CN23 (3)-(4) pins or
CN23 (8)-(6) pins or
9
CN22 (10)-(13) pins
8
are shorted.
7
6
5
4
N
3
2
1
(1)
N
N
STANDBY power supply (MPU
power supply) system has
short-circuit.
Y
127
PSU board is
defective.
STANDBY power supply
has abnormality.
LOGIC board is
defective.
X-SUS board is
defective.
Switching circuit (power
supply) has a short-circuit.
Turn off the AC power,
End of analysis