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4. Abnormal screen (TV)-Main PCBA
Abnormal screen (TV)
1
Put into RF cable completely?
2
Is 5V at 5pin of TU401?
3
Is I2C wavef orm
At 6,7pin of TU401?
4
Is IF wavef orm at 67
,68 pin of IC600?
Change Main PCBA
WAVEFORMS
3
7Pin of TU401 (SCL)
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Only for training and service purposes
NO
YES
NO
NO
NO
6Pin of TU401 (SDA)
insult RF cable tight and then
If 4.9V is not at plus pin of L705, check
It is over 3V at 2pin of IC706,
if it is not, Check Line between IC706
and IC600 is open or short.
Check Line between TU401 and IC600
is open or short, Another is change
Check Line between TU401 and IC600
is open or short, Another is change
4
67, 68pin of IC600
- 15 -
Cable nut screw tight.
Another is change IC706
IC600 or TU401
IC600 or TU401
LGE Internal Use Only
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