Page 1
L32WD22
Repair Flow Chart
1. No Power (No LED indicator)
Check power cord and board interface
OK
Check F901, BD901, C907
OK
Check IC901, Q901
OK
Check T901
OK
Check D905, D914
OK
Check ZD901
NG
NG
NG
NG
2. Can not start (LED indicator yellow)
NG
NG
Replace ZD901
Replace F901 or BD901 or C907
Replace IC901 or Q901
Replace T901
Replace D905 or D914
Plug in power cord and interface
Check key board
OK
Check 5V SB
OK
Check PWR ON signal
OK
Check RELAY-SW signal
OK
Check main board power supplypart
OK
Check U401, U404
OK
Check I2C communication
NG
NG
NG
NG
NG
Repair the key board
Return to “1”
Check U905, Q906, Q907
Check I2C communication
Replace Q913, Q914
Replace U401 or U404
NG
Replace U905 or Q906 or Q907
Page 2
L32WD22
3. Abnormal display
Check the source
OK
Check signal filter circuit
OK
OK
NG
Reset source
NG
TV signal Check TV system setup
NTSC, AV,
Component, PC signal
HDMI signal
Replace the filter or inductance
OK
Check TU701
OK
Check U701
Check U108
Check U107
Check U414, U415
NG
NG
NG
Replace U701
Replace U108
NG
NG
Replace TU701
Replace U107
Replace U414, U415
Check U401
NG
Replace U401
Page 3
L32WD22
p
A
4. No sound
Check the source
OK
NG
Reset source
Check signal filter circuit
Check Earphone jack
OK
Check U401
Check U601
NG
NG
SIF signal Check TV system setu
V, Component, PC signal
NG
Replace the filter or inductance
Replace the Earphone jack
OK
Check TU701
OK
Check U701
Replace U401
Replace U601
NG
NG
Check U103
OK
Check U101
Replace TU701
Replace U701
Replace U103
Replace U101
OK
Check speaker
NG
Replace speaker
Page 4
L32WD22
5. Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Y
Is Button Switch normally?
Y
Is Key Pad Board Normally?
Y
N
Connect Key Pad Board
N
N
Replace Button Switch
Replace Key Pad Board
Check Main Board
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