Dell E157FPc Service Manual page 44

15" LCD Color Monitor
U401-data Output
Check GM2621 (U401)
Signal output (PIN 7 -16, PIN 31 - 40)
Is the waveform ok?
Replace panel
NG
OK
44
Replace GM2621 (U401) or
replace Main board.
If Main Board being replaced, please
do the DDC – content reprogrammed,
and do the white balance adjustment
Dell E157FPc