Question about BenQ FP731 17" LCD Monitor

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Just a little help..


I have the same problem as described in this topic just with a different BenQ model FP767. Do you think it would be the same solution? I have taken it apart and found all four transistors but I don't know how to check if they are shorted. Can you help please?

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  • smokisa Apr 17, 2008

    Right, I have done as I was told... and I didn't find any blown.

    I mean if they are on the board and I put my multimeter on continuity it does make sound on all combinations but the values are different... and are all the same on all 4! So I took them off and redone as you told me... and it all seems ok!

    I have checked 2 diods that I read about in I think one of your other posts and they didn't look right as one of them had same values on the diod test on the multimeter bouth ways. This was with the 4 tranzistors on the board.

    But after I resoldered tranzistors back on to the board after I checked them the diod that had bad values is now the same as the other one.

    Do you think that all it needed is a resolder? I read they get hot and that's what couses dry contact.

    If not what to check next?

    Your effort is much apprechieted by the way :) so just keep on helping if you can... I have another 2 monitors with the same problem... All came out of one of our IT classrooms.



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Use a multimeter and follow this =) The dots will be the pins (just for reference)

  • PIN1
  • PIN2
  • PIN3
OK, it does not matter what outside one you would like to call pin 1 or do not be too concerned with that.
Set the multimeter to continuity mode. (gives a tone when the 2 probes are touched together)

Put a probe onto one of the outside pins and use that as a reference to being pin 1, then put the other probe to pin 2
The move the probe on pin 1 to pin 3.
so if you touch them like this:
1 & 2
1 & 3
2 & 3

If any of those give a solid tone, then it is shorted. But you will notice there are 2 of these at the top of the board, and 2 at the bottom. If one of either is shorted, then they both need to be replaced.

If you follow that you will soon see if anything there is shorted. The biggest problem is this is only the beginning.

Hope it helps =)

Posted on Apr 12, 2008

  • Peter Thompson
    Peter Thompson Apr 17, 2008

    Sounds like your in for some fun. +)

    Check the PF link at PF801 (with the power socket at the bottom, it's near the top, close to the middle.

    It should hold a tone for 10 seconds + if it gives a tone, it will cut out after a few seconds if it's bad.

    If you were getting tones (solid tones) on the transistors, then they are indeed faulty. You should hold it on each grouping for 2 seconds to give the meter a bit of time to settle.

    Resoldering these has no effect. They get hot, but you need temps around 300 degrees to melt solder. They burn up after about 80 degrees in normal use.

    Take a photo of the top (component) and bottom (solder) sides of your board and email them to me. I will do a little coulouring in and send them back for you.



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