I have the same problem as another user where my monitor turns on then flashes almost instantly off. You mentioned re-soldering transistors near the inverter transformer. Only problem is, I've got 5 transformers and I'm not sure which one you are referring too..
Are you able to supply the 'component' numbers for the transistors that need to be replaced? I'm thinking you are referring to Q808,Q809,Q815 and Q816. Any help would be appreciated - I'm a novice.. I can take a photo of the power board if that would be any help..
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Re: BenQ FP731 17" Inverter transistors
T751,752,753,753 are the transformers to be resoldered ,and resolder Transistors Q759,60,39,40,43,51.
Please check them with a multimeter if you are adept .
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Check for blown MOSFET IRFU9024N and transistors C5707/5706, and fuse in the inverter circuits section. Also look for bad caps with bulging top/seal. See some pictures of failed Dell monitors (BenQ made alot of monitors for Dell), http://s807.photobucket.com/home/budm/allalbums
Most of the time problem is Invertor transistors being defective and Inverter transformer dry solder.
But you must be technically able with soldering skills and be able to test transistors using a multimeter.
You have BenQ syndrome.
Sounds strange I know, but the power supply in your monitor is a BenQ manufactured part.
The problem is in the inverter section of the power/inverter board.
There are 4 small transistors (marked C5707) 1 or possibly 2 of these will have shorted out. Using a multimeter find the shorted one, and replace both of that pair, even if only one is shorted out.
There could also be other underlying issues as well that caused the transistor to fail in the first place.
Resolder the power transistors on inverter board and also check them.If display is not there at all some of this 4 transistors C5707 should be defective.Check associated fuse and Fet which drives the transistor.
Also check with Benq ,Normally offers three year warranty.
When you first switch on Does it show Benq?If not the inverter circuit has failed.If you are technically able you can try resoldering transistors on inverter board.If your display is black all of the time transistors could have failed as also related fuse etc.
And yes please check with BenQ Normally these have a 3 year warranty.