Acer AL712 Schematic

Free Report

Brought to you by Jestine Yong

http://www.LCD-Monitor-Repair.com

Feel free to pass this short report to a friend or colleague

How to Repair BENQ Fp731 17" LCD

Monitor With No Power Symptom.

The BenQ FP731 17” LCD Monitor came in with no power symptom.
Normally I would not immediately use all my testing gear to check the
whole power and inverter board instead I would use my eyes to scan all
the components first before starting to use my digital multimeter to check
on the fuse and other components first.

2

I saw about 8 filter capacitors that had bulged and leaked on top of its
capacitor casing. We have the first clue and if my assumption is right, it
will only be the capacitors that caused no power symptoms. However in
order to be in the safe side we have to check other components as well.

Looking at the power primary side didn’t reveal any burnt or cracked
components in the board. It is not good enough just by looking at the
board, we must check few of the critical components first in order to
confirm that it is safe to switch on the power after the replacement of the
8 faulty capacitors.

The critical components that I referred to was the fuse, power or chopper
FET (mosfet), switch mode power supply primary winding and secondary
diodes. If you have the experienced, you can check all of the components
on board without removing it but of course the SMPS primary winding
you have to use a flyback tester to test it.

3