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    #21
    Re: benq fp767 problem 17 inch

    Originally posted by gasan View Post
    ok q759+ q760 + q739+q740 gave me the same reading !!!! mybe its high voltage capacitors (blue). thank you guys
    any suggetions?????
    Sorry my crystal ball is in the shop....
    What readings?
    And the fuse???
    36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

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      #22
      Re: benq fp767 problem 17 inch

      Originally posted by smason View Post
      Some people (like some of my co-workers :slap: ) when sent an email with 2 questions, always seem to only answer 1.
      I find this useful and will probably switch to this asap. Start using numbered questions.

      1) where do you live?
      2) do you know how to use a multimeter?
      3) do you have basic electronics knowledge?
      4) do you have a solder iron?

      This forces the poster to enumerate each question and answer.
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        #23
        Re: benq fp767 problem 17 inch

        collector -emiter= 198
        collector- base= 493
        base- emitor = 723

        Comment

          #24
          Re: benq fp767 problem 17 inch

          the main fuse is ok because i can see the benq logo on the screen and my operating system windows xp but all dark without a light

          Comment

            #25
            Re: benq fp767 problem 17 inch

            Originally posted by gasan View Post
            the main fuse is ok because i can see the benq logo on the screen and my operating system windows xp but all dark without a light
            1) STOP and READ CAREFULLY. This is getting silly.

            2) STOP AND READ for one second.

            3) You have been asked no less than 6 times (in posts 5, 7, 12, 16, 19, and 21) to check the picofuse PF751.

            4) CHECK picofuse PF751.

            5) Report the ohms measurment.
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              #26
              Re: benq fp767 problem 17 inch

              its 532 (i put the multimeter on 2000k ohm) is that good or bad ????

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                #27
                Re: benq fp767 problem 17 inch

                Originally posted by gasan View Post
                its 532 (i put the multimeter on 2000k ohm) is that good or bad ????
                1) Retest with your multimeter set to 200 (two hundred) ohms.

                2) If it says "1" on the left hand side of the display, that means out of range.

                3) A good fuse on the 200ohm setting should read 0.3 ohms.

                4) Report the new ohm measurement.
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                  #28
                  Re: benq fp767 problem 17 inch

                  That's bad. It should read 000 to 008 give or take depending on the meter/leads etc.

                  I recently repaired 2 of these, one had shorted transistors, the other just had a bad fuse.

                  So it IS possible that the fuse is the only problem.

                  I would do the following:

                  1 re-solder all of the transformer pins
                  2 double check the transistors
                  3 replace fuse
                  4 test
                  36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

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                    #29
                    Re: benq fp767 problem 17 inch

                    at 200 ohm on the multimeter it read "1"

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                      #30
                      Re: benq fp767 problem 17 inch

                      Originally posted by gasan View Post
                      at 200 ohm on the multimeter it read "1"
                      1) You have a blown picofuse. This picofuse protects the inverter section. If it is blown, there will be no backlight. This will need to be replaced.

                      2) If you don't want to replace it again, pay attention and follow ALL the steps as listed by Krankshaft at

                      https://www.badcaps.net/forum/showpo...2&postcount=21

                      3) Even though it is not the same monitor, they are made the same vendor and have the same problem.

                      4) You *MUST* do all the steps outlined by Krankshaft. It is a mandatory.

                      5) Also, follow the suggestions by my fellow Canadian, smason, in post #28.
                      Last edited by retiredcaps; 09-03-2010, 11:24 AM. Reason: added 5)
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                        #31
                        Re: benq fp767 problem 17 inch

                        thank you so much retiredcaps so how could i know it just a problem with pikofuse

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                          #32
                          Re: benq fp767 problem 17 inch

                          Originally posted by gasan View Post
                          thank you so much retiredcaps so how could i know it just a problem with pikofuse
                          It is possible that just the fuse is bad. Fuses can go bad just by themselves.

                          However, it is prudent to take precautionary measures as outlined in #28 and #30.
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                            #33
                            Re: benq fp767 problem 17 inch

                            so i did all what you mention (resoldring ....etc).
                            what should i do now just wait to get brand new fuse or test somthin else ????
                            Last edited by gasan; 09-03-2010, 12:04 PM.

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                              #34
                              Re: benq fp767 problem 17 inch

                              this test wihout the pikufuse (i desolder it)
                              base - collector =0.49 (at 20k multimeter)
                              base - emmiter =6.63 (at 20k multimeter)
                              collector -emmeter =5.85 (at 20k multimeter)
                              these results apply to q740 + q739 +q760 +q759

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                                #35
                                Re: benq fp767 problem 17 inch

                                Originally posted by gasan View Post
                                so i did all what you mention (resoldring ....etc).
                                what should i do now just wait to get brand new fuse or test somthin else ????
                                If you have done *everything* that smason and Krankshaft have outlined, then go ahead and get a new fuse.

                                Before installing it, test it out of circuit to ensure it reads 0.3 ohms on the 200 ohm (two hundred) scale.

                                After you install it, review all the steps in #28 and #30 one last time. Then and only then apply power.
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                                  #36
                                  Re: benq fp767 problem 17 inch

                                  ok thank you i really appreciate you guys about your efforts.
                                  i have a little quistion for you guys , what is the pecofuse i really didnt get it and What its role ????????????????

                                  Comment

                                    #37
                                    Re: benq fp767 problem 17 inch

                                    Originally posted by gasan View Post
                                    what is the pecofuse i really didnt get it and What its role ????????????????
                                    1) Spell it correctly. It is picofuse. Not pecofuse or pikofuse. Spelling it correctly will help when you use the search function (hint).

                                    2) Searching for picofuse yields ...

                                    https://www.badcaps.net/forum/showpo...50&postcount=2
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                                      #38
                                      Re: benq fp767 problem 17 inch

                                      ok guys i bought brand new picofuse 3.15a and its working but suddenly when i unplug the cable from the wall (AC CABLE) and put it back agian there is no light (the same problem)

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                                        #39
                                        Re: benq fp767 problem 17 inch

                                        its like somthing is shorting the fuse !!!!!!!!! so wierd

                                        Comment

                                          #40
                                          Re: benq fp767 problem 17 inch

                                          Originally posted by gasan View Post
                                          its like somthing is shorting the fuse !!!!!!!!! so wierd
                                          Replace Q739, Q740, Q743, Q751, Q759, Q760, PF751. Remove all the solder from the pins of the 4 inverter transformers, then resolder them.

                                          PlainBill
                                          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

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