Panisonic 42inch TCP42S30 not working!!

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Glitcher
    Badcaps Veteran
    • Mar 2013
    • 673
    • USa

    #21
    Re: Panisonic 42inch TCP42S30 not working!!

    Originally posted by Hok
    If this is the case, there appears to be a lot more mosFets than usual that are fried. [D642,D641,D461,D481,
    Those are actually diodes. They have the same look and package as a FET but its different. I'm assuming you measured them shorted from pins 1 and 3? In that case its normal.

    **Think of it as two separate diodes in the package, where pins 1 & 2 is a diode and pins 2 & 3 is another diode. And if I remember right the direction of flow would point toward pin 2.

    Comment

    • Hok
      Senior Member
      • Apr 2014
      • 70
      • USA

      #22
      Re: Panisonic 42inch TCP42S30 not working!!

      Great, thanks for taking the time to help out a n00b.

      R401,402,421,422 all read 7.5-8 Ohms. Have removed the corresponding igbt's thinking they were faulty - only 1 is faulty.

      q451 and q441 are faulty, but the corresponding resistors both measure about 6 Ohms

      Q621 and Q622 appear to be faulty - their corresponding resistors measure 115 Ohms (there are additional resistors as well, R682 and R681 that measure 10 Ohms each)

      Q601 appears to be shorted, and R601 reads 1 Ohm (There is discoloration in the holes around Q601 and Q

      Q661 and Q660 appear to be shorted.

      have lifted both legs on all of the shorted transistors - only one left is:

      Q600, which appears to be shorted. Board still showing short, cross your fingers for me on this last piece...

      Comment

      • Hok
        Senior Member
        • Apr 2014
        • 70
        • USA

        #23
        Re: Panisonic 42inch TCP42S30 not working!!

        It's clear that I'm out of my league

        lifted one leg on Q600, and board is still showing short. I have no way of testing IC502, but I doubt that it could be causing a short. I have tested all the normal components that come in the repair kits, as well as a multitude of others. Was hoping that I could find the issue on my own, but I think i'm grasping at straws at this point. These boards are hard to come by and expensive, as well...

        Comment

        • Hok
          Senior Member
          • Apr 2014
          • 70
          • USA

          #24
          Re: Panisonic 42inch TCP42S30 not working!!

          I guess the current Panasonic Plasma in this size cost about 3.5x the cost of these boards.. Ugh i'm really hating televisions right now.

          Comment

          • tw2005
            Badcaps Legend
            • Oct 2011
            • 6458
            • Australia

            #25
            Re: Panisonic 42inch TCP42S30 not working!!

            So at SN2 in diode mode, what happens when you probe across the pins

            Comment

            • Hok
              Senior Member
              • Apr 2014
              • 70
              • USA

              #26
              Re: Panisonic 42inch TCP42S30 not working!!

              Can I go through the TP points on the back of the board to isolate where the fault(s) is/are? If so, how would I go about it?

              Comment

              • Hok
                Senior Member
                • Apr 2014
                • 70
                • USA

                #27
                Re: Panisonic 42inch TCP42S30 not working!!

                sorry just posted that and it refreshed, TW - saw your post...
                what happens is 0L one way and .453 volts the other, on audible i get 0L both ways

                Comment

                • tw2005
                  Badcaps Legend
                  • Oct 2011
                  • 6458
                  • Australia

                  #28
                  Re: Panisonic 42inch TCP42S30 not working!!

                  Originally posted by Hok
                  sorry just posted that and it refreshed, TW - saw your post...
                  what happens is 0L one way and .453 volts the other, on audible i get 0L both ways
                  That's not short.

                  Comment

                  • Hok
                    Senior Member
                    • Apr 2014
                    • 70
                    • USA

                    #29
                    Re: Panisonic 42inch TCP42S30 not working!!

                    oops. Well that was a headache I probably didn't have to live through, had i had a bit more knowledge.

                    Does it indicate that I have isolated the faults?

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia

                      #30
                      Re: Panisonic 42inch TCP42S30 not working!!

                      Indicates no longer shorted which is what would have triggered the original condition. Impossible to say you've isolated the faults as there are several blown components.

                      What is making this difficult is knowing if you are testing the parts correctly and interpretting the meter right.

                      what type of meter have you got? I'm not understanding OL/reading in diode and OL/OL in audible.

                      Comment

                      • tw2005
                        Badcaps Legend
                        • Oct 2011
                        • 6458
                        • Australia

                        #31
                        Re: Panisonic 42inch TCP42S30 not working!!

                        http://www.moduslinkptstvboards.com/TXNSN1PKUU/

                        Intersting the AD revision will also work and subtitute but they charge $30 less?

                        http://www.moduslinkptstvboards.com/tnpa5349ad/

                        Comment

                        • Hok
                          Senior Member
                          • Apr 2014
                          • 70
                          • USA

                          #32
                          Re: Panisonic 42inch TCP42S30 not working!!

                          thanks for those links, I first exhausted that search before I began to work on this. Understand your doubts about my abilities.... and I respect your patience, knowing what a pain it can be for you to think in Latin when i work in dogspeak
                          Using a Mastech DMM - the diode mode has a ->+ setting that shows volts or 0L and the audible setting 0))) which gives the beep and shows ohms on the display

                          Comment

                          • Hok
                            Senior Member
                            • Apr 2014
                            • 70
                            • USA

                            #33
                            Re: Panisonic 42inch TCP42S30 not working!!

                            I was testing across SN2 with the audible setting, and not the diode mode, this is why I assumed I had not yet found the fault(s) with the board - i was getting 0L every time, in both directions.

                            Comment

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia

                              #34
                              Re: Panisonic 42inch TCP42S30 not working!!

                              Originally posted by Hok
                              thanks for those links, I first exhausted that search before I began to work on this. Understand your doubts about my abilities.... and I respect your patience, knowing what a pain it can be for you to think in Latin when i work in dogspeak
                              Using a Mastech DMM - the diode mode has a ->+ setting that shows volts or 0L and the audible setting 0))) which gives the beep and shows ohms on the display
                              OK, that probably explains the results. So in diode mode if you short the probes it shows 0 but there's no audible feature or noise in that mode?

                              Comment

                              • Hok
                                Senior Member
                                • Apr 2014
                                • 70
                                • USA

                                #35
                                Re: Panisonic 42inch TCP42S30 not working!!

                                diode mode shows 0L in one direction and .453 volts in the opposite direction, and there is no audible in that mode.

                                to use the audible testing, I go to the 0))) setting, which offers a beep or constant beeping and measures in ohms

                                Comment

                                • Glitcher
                                  Badcaps Veteran
                                  • Mar 2013
                                  • 673
                                  • USa

                                  #36
                                  Re: Panisonic 42inch TCP42S30 not working!!

                                  Originally posted by Hok
                                  sorry just posted that and it refreshed, TW - saw your post...
                                  what happens is 0L one way and .453 volts the other, on audible i get 0L both ways
                                  That seems about right, that's the exact reading I had on mine. If it was still shorted it would just read low resistance no matter what setting you used.

                                  Now you just need to get those parts replaced and youre good to go!

                                  Comment

                                  • Hok
                                    Senior Member
                                    • Apr 2014
                                    • 70
                                    • USA

                                    #37
                                    Re: Panisonic 42inch TCP42S30 not working!!

                                    i see... well i hope it's that easy, as it stands i've got 2x DG302's and 6x 30F131's disconnected from the board. Guess I oughtta make sure i need them before I order them...

                                    I do get a voltage reading from 2 of the 30F131's when they're connected, but not when they're disconnected. Same with the 2 DG302's. Funny, because I believe I was told to check resistance on those, which I thought was measured by Ohms, so I was on the wrong setting perhaps?

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6458
                                      • Australia

                                      #38
                                      Re: Panisonic 42inch TCP42S30 not working!!

                                      I'd like you to go back to all the transistors and diodes again and see if we can be methodical and clear about the results.

                                      What do you think? Or just buy the kit and take a gamble?

                                      Comment

                                      • Hok
                                        Senior Member
                                        • Apr 2014
                                        • 70
                                        • USA

                                        #39
                                        Re: Panisonic 42inch TCP42S30 not working!!

                                        i would love to know what's wrong before I order it, so I'm game. Keep in mind, that I have four transistors off the board... (30f131's) Can test them, but broke the leg off one of them so don't think i'll be able to reuse that one.
                                        Last edited by Hok; 04-17-2014, 05:18 PM.

                                        Comment

                                        • tw2005
                                          Badcaps Legend
                                          • Oct 2011
                                          • 6458
                                          • Australia

                                          #40
                                          Re: Panisonic 42inch TCP42S30 not working!!

                                          Originally posted by Hok
                                          i see... well i hope it's that easy, as it stands i've got 2x DG302's and 6x 30F131's disconnected from the board. Guess I oughtta make sure i need them before I order them...

                                          I do get a voltage reading from 2 of the 30F131's when they're connected, but not when they're disconnected. Same with the 2 DG302's. Funny, because I believe I was told to check resistance on those, which I thought was measured by Ohms, so I was on the wrong setting perhaps?
                                          Ok, the 2 that give no reading out of cct (OL i assume) should be ok. These fail dead short across all 3 pins usually.

                                          Measuring resistance is fine if you know what you're looking for which is a dead short or 0 ohms.

                                          So it sounds like the DG302 are also fine. I'll find a video which shows how to test them out of cct in diode which involves switching the transistor on otherwise you see no reading in diode.

                                          Comment

                                          Related Topics

                                          Collapse

                                          • MMH3
                                            Dell Optiplex 5050 SFF - strange behavior and service_mode jumper not working anymore
                                            by MMH3
                                            Hello,

                                            i have many 5050sff. all of them, and how i experienced over many years for all about 250 DELLs goin through my hands, are fully flashable and can be serviced in any way when the service_mode jumper is set.
                                            Never ever i experienced problems with that.

                                            Now i have one 5050sff machine, where this jumper isnt working at all.
                                            I do not get the normal messge that the jumper is set when booting and a short test with FPT just confirms this. Everything is locked -->> EVEN for reading !?

                                            The history of the machine is that i used it in my office...
                                            03-23-2025, 09:28 PM
                                          • DynaxSC
                                            GIGABYTE X299 AORUS ULTRA GAMING - SATA PORTS 4-7 NOT WORKING ???
                                            by DynaxSC
                                            Hi,

                                            I have the above mentioned bord after repair, which was related to a lot of missing smd devices on the back of the board.
                                            There were almost 20 devices missing, caps, resistors and some diodes/mosfets.
                                            The board is generally working now, all PCIe ports are working, Windows installs normally.

                                            However I have a problem with SATA ports 4-7 (the board has 8 SATA ports) - disks are not beeing recognized by the BIOS neither by Windows (which is usually normal in case BIOS does not recognize them).
                                            The SATA 4-7 driver network is quite simple chipset<->buffers/drivers<->SATA...
                                            03-10-2025, 12:27 PM
                                          • obelix24
                                            Macbook Air 2020 (a2179) - touch id not working
                                            by obelix24
                                            Hi i have one Macbook Air 2020 where touch ID is not working (it's not scanning fingerprints). Touch ID was working before, there is no error message during scanning fingerprint it's just not scanning on screen you can see only fingerprint but there are no red updates as when it's working. Power button is working fine.

                                            I've checked boardview and also schematics but i'm not able to find anything related to TouchID ... i have similar issue on a2338 where there was problem with PP3V0_TOUCHID​ and after replacing UT610 it was working but here i'm not able to find anything related to...
                                            02-09-2025, 12:57 PM
                                          • hopkok
                                            Lenovo Legion 16ITHg6 NM-D721, keyboard not working, LEDs too
                                            by hopkok
                                            Hi masters, I need your help.

                                            I am working on Lenovo Legion 16ITHg6
                                            Motherboard number NM-D721, no BV, no schematic but I am attaching very closes ones.

                                            INPORTANT: My motherboard version is with IT8258 IC, that is controlling keyboard and RGB LEDs.

                                            My problem is on UI142, +3VALW_AG is not stable, floating from 0V to 3,3V.
                                            AGKB_PWR_EN_N signal is floating too (that is why+3VALW_AG not stable).
                                            Power LED is not working as well, power button working well.
                                            UI26 ??? is there any firmware too? Powered by +3VALW_AG.

                                            Motherboard...
                                            05-04-2025, 09:35 AM
                                          • bociub
                                            laptop freezes, usb 2.0 not working, usb 3.0 working
                                            by bociub
                                            Hi there,

                                            It is sunday and I got a faulty hp pavilion 15-cs1006na. No available schematics on the entire world. It flashed 5 long 4 short and no post then I discovered the usb 2.0 2. pin in one of the usb-a socket bent backwards and been shorted to 2. and 3. pin of the 3.0. after removing this short in the port the laptop came alive.

                                            Now the laptop freezing randomly. The webcam, the built in mic and according to the device manager one more thing not working which are connected to usb. If I connect anything what have usb 2.0 plug that wont work if i plug anything what...
                                            08-25-2024, 03:44 PM
                                          • Loading...
                                          • No more items.
                                          Working...