Troubleshooting - TCL SY33 Service Manual

6、Troubleshooting
LED ok,No Picture,
No sound
Check if 112V is short
to ground?
N
Check if 18V is short
to ground?
N
Check IC201 power
supply +5V ok?
Y
N
Check waveform of
X001ok?
Y
N
The waveform of
SDA and SCL ok?
Y
N
Check +5VA ok？
Y
N
The waveform of
H-out of IC 201 ok?
Y
N
Q401output
waveform ok?
Y
N
Q401output
waveform ok?
Y
N
Check each pin of
T402 ok?
Y
N
Check IC301 ok?
Y
Check ambient
parts of IC301
and replace the bad
OVER
Y
Replace Q402
Y
Replace IC601
Check which branch
N
short to ground and
repairing
Replace X001
Replace IC001
Replace IC205
Replace IC201
Replace Q401 or D406
Replace Q401
Replace T402
Replace IC301