- 1 -
TROUBLESHOOTING
1. No Video
Check Video output
Check the waveform of IC702
Check the waveform at Video
terminal of TUNER(TU102)
Check the waveform
at pin 25(Yout)
Check the waveform at pin
49 of IC201
Check the waveform(Yin) at
pin 4 of IC501
Check pin 53 of IC201
(A/V SW)
Check the waveform(fs0) at
pin 11 of IC702
Replace IC702
Check the waveform at pin 1
of IC701
Replace IC701
Check the in/output of IC501
Replace IC501.
Check the voltages MB, 30V and
5V of TU102.
Repair Power Circuit.
Check Power Circuit.
Check
U-COM SDA,
SCL
Check ZD161 and ZD162.
Replace TU102.
Check R,G,B output of IC501
Check FBT B+
Check CPT Board.
Yes
Normal
Normal
Normal
Normal
Normal
Normal
0V
Normal
Abnormal
Abnormal
Abnormal
Abnormal
Abnormal
Abnormal
No
LOW
