Trouble Shooting Chart
No Video
Signal present at
some of resistors
Check CVBS jacks, S-video jacks,
Y/ Pb /Pr jacks
Solution:
?
if not any signal at all resistor
Replace U1 (ALI M3351)
Check if any poor contact between
34 and Cn503
Solution: Replace if Q6,Q7, Q4,
Q5 damaged
NO
Audio output is normal
but no Video
Check point:
R87, RP2, RP5, RP6 On the main board
Observe: Is there any video output signal
Board is shot circuit manually.
Check point:
L12, L11, L6,L4,L9,L7 on main board
Observe: open circuit
Check point: pin2,4,5,6,7,8
Of Cn503 on power board
Observe: open happen
NO
NO
YES
YES
4-4
GO
CVBS(R96 point) waveform