BenQ FP72G+ 17" LCD Monitor NO DISPLAY
posted by rickyykk on Apr 22, 2008
Thanks so much for your help ! =)
I've found 1 X 2SC5707 ( short circuit )
I've also found 1 X FU9024N (HexFET Power MOSFET) ( short circuit )
are there any other components that needs to be replaced associated with these 2 parts ?
please reply Thanks !
Comment by rickyykk, posted on Apr 22, 2008
I've replaced 1 X 2SC5707 (Q808)
I've also replaced 1 X FU9024N (HexFET Power MOSFET)(Q805)
re-soldered all the legs of the 4 transformers
but still not working, NO DISPLAY,
it's even worst this time, when i shine a torch on the screen, no dim display at all ???
I've also replaced 1 X FU9024N (HexFET Power MOSFET)(Q805)
re-soldered all the legs of the 4 transformers
but still not working, NO DISPLAY,
it's even worst this time, when i shine a torch on the screen, no dim display at all ???
Solution #1
posted on Apr 22, 2008
GuruThe way the circuit works is in a mirror format. There are 2 identical circuits that go to each end of the board.
Be sure to check that fuse for continuity, not just for a second like you normally would, but hold it for a good 10 seconds.
Also don't forget while you are in there it's best to repolace it anyway with an actual fuse. A 3A slow blow ceramic is good for this.
Check the 4 transformers as well, if you notice the top circuit is the faulty one, then check the transformers at the top. The transistors are quite powerful, and normally need something to trigger them into failing. Do the same for the bottom circuit.
This monitor came in 2 formats. One with 4 transformers and 4 CCFL tubes, one with 2 transformers that lead to 2 CCFL connectors powering 2 tubes each (3 wires per CCFL)
When you order the 2SC5707's get extras just to be on the safe side. If it goes again, then turn the monitor off immediatly and check them. It should only be 1 failed again, so just see which of the 2 transformers it was primarily attached to and replace it, or both.
Be sure to check that fuse for continuity, not just for a second like you normally would, but hold it for a good 10 seconds.
Also don't forget while you are in there it's best to repolace it anyway with an actual fuse. A 3A slow blow ceramic is good for this.
Check the 4 transformers as well, if you notice the top circuit is the faulty one, then check the transformers at the top. The transistors are quite powerful, and normally need something to trigger them into failing. Do the same for the bottom circuit.
This monitor came in 2 formats. One with 4 transformers and 4 CCFL tubes, one with 2 transformers that lead to 2 CCFL connectors powering 2 tubes each (3 wires per CCFL)
When you order the 2SC5707's get extras just to be on the safe side. If it goes again, then turn the monitor off immediatly and check them. It should only be 1 failed again, so just see which of the 2 transformers it was primarily attached to and replace it, or both.
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