Power Supply Board Failure Check - Haier LC22KW1 Service Manual

9-2. Power Supply Board failure check.

N
Check F1 and peripheral power supply
F1 is damaged？
N Y
Check power
supply net
OK
follow F1
Check (F1/3A) for 12V？
Turn on the TV-set(By button or
remote control)
N
Check U6/MCU
1:Power supply(U7、U9))
2:Reset signal
3:Crystal
N
Change U1/MP1410ES-LF or
D17/SK34A-SMA
Check E33/470μF/16V for 5V
N
Y
Check U1 for 5V
output
Check L9/47μH
It's normal but the
voltage is high
Check Pin No.4 of
U1/MP1410-ES or
change U1
Y
Were those
LDO(U10,U13,U16,U18,U19,
etc.)worked normal?
N
LDO was damaged
or the loader is in
short circuit
Y
It's normal but the
voltage is Low
E33 was damaged
or the loader is in
short circuit
Y
Y
OK