Trouble Shooting - Haier HL22KN1 Service Manual

9.Trouble shooting

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