Benq FP91G+ Monitor
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Re: Benq FP91G+ Monitor
What he was trying to say is that BenQ boards have not only the 5707's but they also have another part that looks exactly the same. On the picture of your powerboard on top you can see a part location number of Q805 and next to C821 there is another one of those. I think he gave you the correct part number for them if I recall correctly. You should pull each of them and check them also as they go bad usually right along with the 5707's. Check the part numbers and list them and Bud can tell you how to test them. I have repaired several BenQ boards and each of them have had that part be toasted right along with the 5705's.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: Benq FP91G+ Monitor
Spec sheet. If this MOSFET has shorted out S to D, the backlights will be fully on bright and not be able to adjust the lamp brightness. It is driven by the PWM signal to vary the B+ feeding the backlights ROYER Oscillator output circuits.Attached FilesNever stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Benq FP91G+ Monitor
After re-soldering the C5707 transistors, I now have a new symptom. The monitor works for a while and then turns off. I switch it on again and works for a couple of minutes or hours and shuts down again.
I tested the 3 pin voltage regulator and got the below results:
Pin 1 -> 3.3V
Pin 2 -> 1.8V
Pin 3 -> 0.00V
I still need to test the regulator when the monitor fails though as I tested it while it was on and working.Comment
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Re: Benq FP91G+ Monitor
matthmal i'm sorry, i've seen now that i don't have read with full attention your post, i read that you've changed only 2 5707, in that monitors there are always 4 and must be replaced all 4 'cause ususally 1 or 2 goes evidently short, the other 1 / 2 goes short under normal activity, maybe yours goes short after some minutes, i don't think you have to change things on primary side like lexwalker says 'cause you first can try the previous and at least try voltages on secondary.
TO Retiredcaps:
i'm unable to translate "You are going to give someone" but the message is almost clear, i think is not an huge job to put a "?" at the end of a phrase, it makes more clarity to an already difficult (for me , maybe for you is all "freshwater") theme . I don't like the smilies icon you put, i don't think i have to receive a smash from you!Comment
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