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soldering and reverse soldering of IC or parts missing.
F.
Check Pin 1 to Pin 16 on U301 for any cold or hollow soldering and reverse
soldering of IC or parts missing.
G.
If the above actions are not working, replace the Driver Board.
T75
TFT ripple
Main Board
A.
Check the 5-pin and 12-pin cables connected to the driver board to see if there
is any problem of plugging. Rule out the problem.
B.
Check the 3-pin cable connected to the inverter board to see if there is any
problem of plugging. Rule out the problem.
C.
If the above actions are not working, replace the Main Board.
Driver Board
A.
Measure the voltage U101 to see if it is correct.
B.
Check J101, J201, and J301 to see if there is any cold or hollow soldering and
reverse soldering of IC or parts missing.
C.
Check the devices surrounding VR311 to see if there is any cold or hollow
soldering and reverse soldering of IC or parts missing.
D.
Check the devices surrounding X301 and X302 to see if there is any cold or
hollow soldering and reverse soldering of IC or parts missing.
E.
Check L201 to see if there is any cold or hollow soldering and reverse soldering
of IC or parts missing. If so, adjust L201.
F.
If the above actions are not working, replace the Driver Board.
Power Board
A.
Check U104, U102 (or U105) for any hollow or cold soldering and reverse
soldering of IC or missing parts.
Inverter Board
A.
Check the 3-pin cable connected to the inverter board to see if there is any
problem of plugging. Rule out the problem.
B.
Check the sharing cable connected to the panel to see if there is any problem of
plugging. Rule out the problem.
C.
Check the high-voltage cable connected to the panel to see if there is any
problem of plugging. Rule out the problem.
D.
If the above actions are not working, replace the inverter board.
Panel
A.
Check the sharing cable connected to the inverter board to see if there is any
problem of plugging. Rule out the problem.
B.
Check the high-voltage cable connected to the panel to see if there is any
problem of plugging. Rule out the problem.
C.
If the above actions are not working, replace the panel.
