MP 42HC56 SINOTEC 42 lcd

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  • battlecat
    Member
    • Mar 2010
    • 18
    • South Africa

    #1

    MP 42HC56 SINOTEC 42 lcd

    Good evening all.
    Anyone came across this this PSU board ?
    No bad caps (wow) but dead.

    all switch mode transistors test 100%
    had 1 dogey cap .
    and it is not powering up , not even the separate psu on the board that from tracing seem to be the standby psu which in turn switch on the rest of the main board.

    i have my suspicions on ic :n501 (Q110 wich is a FPS chip from fairchild semi)
    ordered and waiting from RS components..

    BUT would like some thoughts around it..
    Attached Files
    School fees paid as everyday is a learning curve.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: MP 42HC56 SINOTEC 42 lcd

    What DCV do you get between the two legs of the main filter cap in the primary side?
    BTW, so no DCV on any one of the connector in the secondary side of the circuit at all?
    Never 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=24809

    Comment

    • battlecat
      Member
      • Mar 2010
      • 18
      • South Africa

      #3
      Re: MP 42HC56 SINOTEC 42 lcd

      Hi

      320v dc it's actualy have 2 filter caps,

      one for the 24v supply and a 2nd for the standby..

      i have attached a bottom pcb view..

      I highly suspect that fps ic
      Attached Files
      School fees paid as everyday is a learning curve.

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 8066
        • Canada

        #4
        Re: MP 42HC56 SINOTEC 42 lcd

        Sounds like your PFC isn't working

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: MP 42HC56 SINOTEC 42 lcd

          Originally posted by battlecat
          Hi

          320v dc it's actualy have 2 filter caps,

          one for the 24v supply and a 2nd for the standby..

          i have attached a bottom pcb view..

          I highly suspect that fps ic
          Only one filter cap C533 220uf 450vdc.
          VPFC is used for running the 24V and the standby power supply, when in standby mode, the standby power supply will run on 330VDC (no boosted Voltage yet until PS-ON is present from the main board).
          What DCV do you have on IC N501 VCC pin 2 and GND pin 1? C513 is the startup/running cap for the IC N501.
          The PFC and the 24V will not function until the STANDBY power supply section works first.
          Last edited by budm; 12-01-2015, 08:10 PM.
          Never 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=24809

          Comment

          • CapLeaker
            Leaking Member
            • Dec 2014
            • 8066
            • Canada

            #6
            Re: MP 42HC56 SINOTEC 42 lcd

            Sorry... I thought PSon is there, but 320V on the filter caps (240V rectified) = no PFC

            Comment

            • battlecat
              Member
              • Mar 2010
              • 18
              • South Africa

              #7
              Re: MP 42HC56 SINOTEC 42 lcd

              OK so here is a bummer the FSQ110 from Fairchild is discontinued ...grrrrr...
              Had a look at their datasheets ""with my extremely slow internet connection""

              Followed the ""rabbit "" and pointed me to the FSL206MR which I ordered via RS-Online... and seem there is a couple of light mods needed to get this chap working in there...

              Seem I don't get any voltage on pin 1 and 2 like BUDM mentioned .. not even with the FSL206 in place ...pin 5 is the point to which the cap at pin 2 and 1 get charged up to switch on the Ic N501.. ( maybe some experimenting with the resistor values at pin 5)

              Would it be possible if someone could maybe check up on the FSQ110 versus the FSL206 if I made the right choice there?

              Thanks for the advice and replies thus far
              School fees paid as everyday is a learning curve.

              Comment

              • battlecat
                Member
                • Mar 2010
                • 18
                • South Africa

                #8
                Re: MP 42HC56 SINOTEC 42 lcd

                HERE is the really bad news .....




                No idea how did manufacturers still went ahead and use these devices if this was happening
                School fees paid as everyday is a learning curve.

                Comment

                • SonOfAnarchy ZA
                  Member
                  • Dec 2016
                  • 22
                  • South Africa

                  #9
                  Re: MP 42HC56 SINOTEC 42 lcd

                  Hi guys. Sorry to revive this old thread I''ve also got the same supply and it died as well. blown fuse and D506 was dead short everything else seems to measure correctly I cant seem to find that specific diode but put in a fast recovery diode with similar specifications but the supply is still stone dead I suspect N507 (l6563) to be faulty but not sure was the problem ever resolved on this fault?

                  Comment

                  • SonOfAnarchy ZA
                    Member
                    • Dec 2016
                    • 22
                    • South Africa

                    #10
                    Re: MP 42HC56 SINOTEC 42 lcd

                    I have 7vDC on N105

                    Comment

                    • SonOfAnarchy ZA
                      Member
                      • Dec 2016
                      • 22
                      • South Africa

                      #11
                      Re: MP 42HC56 SINOTEC 42 lcd

                      and 280vDC across the two filter caps

                      Comment

                      • battlecat
                        Member
                        • Mar 2010
                        • 18
                        • South Africa

                        #12
                        Re: MP 42HC56 SINOTEC 42 lcd

                        Hi , check the small electrolyitic cap next to the N105... sit close to pin 1

                        DON"t even check it just replace it.. with exactly the same value.. anything higher or lower messed me around..

                        That will switch on the chip.

                        Also watch out for the HT boards on this tv Master & Slave...


                        FSL206MR that I bought was actually totally wrong
                        School fees paid as everyday is a learning curve.

                        Comment

                        • SonOfAnarchy ZA
                          Member
                          • Dec 2016
                          • 22
                          • South Africa

                          #13
                          Re: MP 42HC56 SINOTEC 42 lcd

                          Originally posted by battlecat
                          Hi , check the small electrolyitic cap next to the N105... sit close to pin 1

                          DON"t even check it just replace it.. with exactly the same value.. anything higher or lower messed me around..

                          That will switch on the chip.

                          Also watch out for the HT boards on this tv Master & Slave...


                          FSL206MR that I bought was actually totally wrong
                          I replaced that cap with no luck. i found a 16v zener diode in short (D502) replaced it but no luck is it possible N501 is faulty?

                          Comment

                          • battlecat
                            Member
                            • Mar 2010
                            • 18
                            • South Africa

                            #14
                            Re: MP 42HC56 SINOTEC 42 lcd

                            Is this Power supply the exact same one as posted in the picture of my thread?

                            Having blown zeners sounds more that this TV had a direct lightning strike.

                            I have been unsuccessful to source the correct chip located at N501 and only found similar ones that works but not in the way intended , hence my discovery of the cap that caused it to not switch on..
                            My last resort was to build a power supply, to supply power the other 2 that this 1 starts up..

                            FSQ110 versus the( FSL206 this particular chip works in a pulse mode effect) RS is closer to you as you are in JHB.. order this and try it in the old N501's place.. At least it would give you a good idea what to look for.....as it does work without any mods.

                            Otherwise suppliers they still have stock of this TV's PSU and CFL driver boards checked 2 months ago..
                            School fees paid as everyday is a learning curve.

                            Comment

                            • SonOfAnarchy ZA
                              Member
                              • Dec 2016
                              • 22
                              • South Africa

                              #15
                              Re: MP 42HC56 SINOTEC 42 lcd

                              Yes it is the exact power supply. i Have ordered that specific chip from China will let you know if it works out

                              Comment

                              • SonOfAnarchy ZA
                                Member
                                • Dec 2016
                                • 22
                                • South Africa

                                #16
                                Re: MP 42HC56 SINOTEC 42 lcd

                                Originally posted by battlecat
                                Is this Power supply the exact same one as posted in the picture of my thread?

                                Having blown zeners sounds more that this TV had a direct lightning strike.

                                I have been unsuccessful to source the correct chip located at N501 and only found similar ones that works but not in the way intended , hence my discovery of the cap that caused it to not switch on..
                                My last resort was to build a power supply, to supply power the other 2 that this 1 starts up..

                                FSQ110 versus the( FSL206 this particular chip works in a pulse mode effect) RS is closer to you as you are in JHB.. order this and try it in the old N501's place.. At least it would give you a good idea what to look for.....as it does work without any mods.

                                Otherwise suppliers they still have stock of this TV's PSU and CFL driver boards checked 2 months ago..
                                which supplier did you contact? i have received the correct parts with no luck still dead as a door knob

                                Comment

                                • kc8adu
                                  Super Moderator
                                  • Nov 2003
                                  • 8832
                                  • U.S.A!

                                  #17
                                  Re: MP 42HC56 SINOTEC 42 lcd

                                  check r597 r598.
                                  thats your startup source.
                                  what voltage do you have pin 2 and 5 of n501?

                                  Comment

                                  • SonOfAnarchy ZA
                                    Member
                                    • Dec 2016
                                    • 22
                                    • South Africa

                                    #18
                                    Re: MP 42HC56 SINOTEC 42 lcd

                                    Originally posted by kc8adu
                                    check r597 r598.
                                    thats your startup source.
                                    what voltage do you have pin 2 and 5 of n501?
                                    Pin 2 Has 10VDC
                                    Pin 5 Has 184VDC

                                    R597 and R598 measure 68kOhm according to the circuit diagram they should be 47KOhm

                                    Comment

                                    • dick_barton
                                      Badcaps Legend
                                      • Aug 2015
                                      • 6642
                                      • Wales

                                      #19
                                      Re: MP 42HC56 SINOTEC 42 lcd

                                      Originally posted by SonOfAnarchy ZA
                                      I replaced that cap with no luck. i found a 16v zener diode in short (D502) replaced it but no luck is it possible N501 is faulty?
                                      If D502 had gone short then the Opto N506 may also have been damaged. I would certainly check it.

                                      What DC voltage do you have on D505.
                                      Last edited by dick_barton; 02-21-2017, 04:44 AM.
                                      Willing to help but I'm no expert.

                                      Comment

                                      • SonOfAnarchy ZA
                                        Member
                                        • Dec 2016
                                        • 22
                                        • South Africa

                                        #20
                                        Re: MP 42HC56 SINOTEC 42 lcd

                                        Originally posted by dick_barton
                                        If D502 had gone short then the Opto N506 may also have been damaged. I would certainly check it.

                                        What DC voltage do you have on D505.
                                        2vDC anode
                                        0v cathode

                                        n506 has been replaced

                                        Comment

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