I have a Viewsonic VP181 18.1" LCD monitor that has a problem with the back light inverter. The seems to be a common problem with it and there are replacement inverters available for about $100. Has anyone managed to repair one of these inverter boards? I've checked all the fuses, caps, power transistors and the transformers. It uses a Hitachi INVC551 inverter. Andy Cuffe
snipped-for-privacy@psu.edu
most common problems are cracked solder connections around xfrms... and high esr electrolytic(s) filtering the input B+ on the inverter board.... must check with an ESR meter or just replace. electricitym . . .
Hi, I just bought a monitor, same as yours, with same problem,
Please let me know if you have brown traces under PCB corresponding with Q1 and Q2 transistors .
I going to check all components, it seems to be complicated
Do you know how to check for transformers T1 and T2 ?
Thanks
Olivier
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