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9. Abnormal sound (TV)-Main PCBA
Abnormal screen (TV)
1
Put into RF cable completely?
2
Is 3.3V at 1pin of TU401?
3
Is I2C waveform
At 4, 5pin of TU401?
4
Is IF waveform at
6, 7pin of IC501?
Change Main PCBA
WAVEFORMS
3
3Pin of TU401 (SCL)
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LG Electronics. Inc. All right reserved.
Only for training and service purposes
NO
YES
NO
NO
NO
4Pin of TU401 (SDA)
insult RF cable tight and then
Cable nut screw tight.
If 3V is not at plus pin of TU401, check
It is over 3V at Q711,
if it is not, Check Q710.
Another is change IC701 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
4
43,44pin of IC501
- 21 -
LGE Internal Use Only
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