ViewSonic Corporation
29
6.1 Panel Power Circuit
6.2 IC101-Data Output
Check R220 should have response from
0V to 3.3V when we switch the power
switch from on to off
Check the PPWR panel power relative
circuit, Q107 In normal operation,
when LED =green, R220 should =3.3V
OK
NG
Measured the U108 Drain= 5V?
Replace U104 and
check PPWR panel
power relative circuit
OK
NG
OK
NG
Check RTD2523 (IC101) signal output (pin73-94)
Is the waveform ok?
OK
Check RTD2523 operation
condition (HS, VS, CRYSTAL)
Replace RTD2523 (IC101) or
replace main board
OK
If Main Board being replaced, please
do the DDC – content reprogrammed
OK
Check relative circuit
NG
OK
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