Question about BenQ FP731 17" LCD Monitor

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Monitor blank hi1 I'm ykeong fr malaysia.I'm having the same problem.All the c5707 is ok I also measureed PF751 fuse n is about 90 ohm.Is this reading ok cos i thought all fuses should have very low ohm

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It's open if it shows 90ohms.
Also remove all 4 2Sc5707 transistors and check.
Also invertor transformer is dry solder ,Resolder all pins of transformers.
Samir

Posted on Feb 27, 2008

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Did you check the fuse PF751, it should be less than 1 Ohm?
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Flashing power LED light means you may have shorted (Emitter to Collector) out transistors (c5707) or bad fuse (fuse has high resistance) PF751. Those are what you need to check. see pictures here: http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

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1 Answer

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Those models are made by BenQ. Their notariety is bad solder connections that cause the drive transistors to overheat. Sometimes it just blows fuse pf751(2 amp); other times it will damage a transistor or two (2sc5707 or 5706 x 4).
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Those are the ones, you are going to have to remove them to test as they are across a transformer

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hi. i had the same problem and fixed it. the problem are the 4 transistors (C5707) one of more are shorted (Q739,Q740 and Q759, Q760). Also the fuse PF751 (3a) has to be replaced in most cases. In my case i replaced the fuse and 1 transistor (C5707)

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