Maintainability; Equipments And Tools Requirement; Trouble Shooting - AOC 177S Service Manual

17" LCD Color Monitor

8. Maintainability

8.1 Equipments and Tools Requirement

Voltmeter; Oscilloscope; Pattern Generator; DDC Tool with an IBM Compatible Computer; Alignment Tool;
LCD Color Analyzer; Service Manual; User Manual.

8.2 Trouble Shooting

8.2.1 Main Board
No Power (No LED indicator)
Rewrite SW
NG
Check U3, U4=5v
OK
Check U2 supply voltage
OK
Check key circuit if ok
Check U2 （pin PWR、RST ）and
Change defective component
No picture（LED green）
The button under control
NG
Check U2、pin50 and pin51 waveforms
is normal
NG
Change U2
NG
Check adapter and connector
NG
Check U2、U3 and U4 if OK
NG
Change defective component
OK
NG
OK
Check U2 BL EN is high voltage
NG
2
Change U
OK
Check C29 and Y1 is OK
Change defective component
36
NG
Change defective component
OK
Analyse inverter
NG
AOC 177S