1. Main Board
- Remove the top cover and dis-assemble F/W(U703), replace with a good F/W or
re-plug it, then check if the action is normal. Otherwise replace the F/W.
- Check UU1, UM1 or U701 to see if there is any cold or hollow soldering and short
circuit problems and rule out the problem, otherwise replace them one by one. (These
are all digital signal and can’t be measured.)
- If the above action does not work, then replace the main board.
TA0 Setting menu abnormal picture
1. Main Board
- Check UM1 to see if there is any cold or hollow soldering and rule out the problem.
- If the above action does not work, then replace the main board.
T30 Audio 1/left channel no sound or abnormal sound
4. Main Board
- Check J13 pin1 and pin 6 of the main board to see if there is any cold or hollow
soldering, short circuit, broken circuit, parts missing, wrong parts and rule out the
problem.
- Check all parts following UA2 to see if there is any cold or hollow soldering, short
circuit, broken circuit, parts missing, wrong parts and rule out the problem.
- If the above action does not work, then replace the main board.
T31 Audio 1/ right channel no sound or abnormal sound
1. Main Board
- Check J13 pin1 and pin 6 of the main board to see if there is any cold or hollow
soldering, short circuit, broken circuit, parts missing, wrong parts and rule out the
problem.
- Check all parts following UA2 to see if there is any cold or hollow soldering, short
circuit, broken circuit, parts missing, wrong parts and rule out the problem.
- If the above action does not work, then replace the main board.
T34 AC3 no sound or abnormal sound
1. Main Board
- Check UM2 of the main board to see if there is any cold or hollow soldering, short
circuit, broken circuit, parts missing, wrong parts and rule out the problem.
- Check all parts following UM2 to see if there is any cold or hollow soldering, short
circuit, broken circuit, parts missing, wrong parts and rule out the problem, otherwise
replace UM2.
- Replace the F/W and make sure that the situation is improved.
- If the above action does not work, then replace the main board.