Panasonic TCP42S30 SN Board reflow-Help out a noob!

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  • WHaThEFLuX
    Badcaps Veteran
    • Feb 2015
    • 277
    • USA
    #61
    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

    I'll have to explore my options, is that something a building electrician might own, or is it more possible to be in the hands of someone who specifically does PCB repair?
    "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

    -retiredcaps

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia
        #62
        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

        Originally posted by WHaThEFLuX
        tw, I'll try to source a remote and see if I can get into service mode, you said any newer panasonic remote will do the trick? Also, you think I should try to hook up some kind of video out and see if anything happens? Wouldn't there be a Viera "splash screen" that displays even with nothing attached?
        no splash , and i'm looking for video output from the a board so either hook up an antenna or a video source to av1 or something and then you'd have to click through tv/av without seeing what's selected so it's all random stuff to try.

        service mode's probably not going to help now that I've seen the panel appears totally dead, it will not display from the video out port either

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK
            #63
            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

            Originally posted by WHaThEFLuX
            I'll have to explore my options, is that something a building electrician might own, or is it more possible to be in the hands of someone who specifically does PCB repair?
            Specifically it is an item in the repair and design of electronic equipment. It's probably not worth getting one for just one repair. But if you can find one you can borrow, it could help a lot, even if it is a basic model.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • WHaThEFLuX
                Badcaps Veteran
                • Feb 2015
                • 277
                • USA
                #64
                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                Ok I'll see if I can find one, something interesting to note, I hooked up my tablet to the A board and cycled the input button, after a few clicks the tablet recognized the TV, however I still have no audio/visual.
                "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                -retiredcaps

                  Comment

                  • WHaThEFLuX
                    Badcaps Veteran
                    • Feb 2015
                    • 277
                    • USA
                    #65
                    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                    And we have sound when connected to HDMI 2, does this mean what I feared most......BAD PANEL!?
                    "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                    -retiredcaps

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK
                        #66
                        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                        Most cracked plasma panels buzz. Certainly, I'd expect to see an SOS6/7 code thrown. I doubt the panel is bad.
                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                          Comment

                          • WHaThEFLuX
                            Badcaps Veteran
                            • Feb 2015
                            • 277
                            • USA
                            #67
                            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                            Well that gives me hope! If there's anything else I could try besides the scope let me know!

                            Is it possible that I put the ribbon cables back into the SN board incorrectly?
                            "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                            -retiredcaps

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK
                                #68
                                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                Try measuring Vfo and Vfg to ground with a meter (SN board outputs, should be ~100V), also check -Vad, Vscn and Vset (where available)

                                Maybe try checking ERC mid voltage (can't remember if this set uses an ERC midpoint though...)
                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                  Comment

                                  • WHaThEFLuX
                                    Badcaps Veteran
                                    • Feb 2015
                                    • 277
                                    • USA
                                    #69
                                    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                    Having trouble locating those, I'm seeing things like TPVFG and TPVAD, am I on the right track?
                                    "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                    -retiredcaps

                                      Comment

                                      • WHaThEFLuX
                                        Badcaps Veteran
                                        • Feb 2015
                                        • 277
                                        • USA
                                        #70
                                        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                        Tom, can you help me locate those points?
                                        "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                        -retiredcaps

                                          Comment

                                          • tom66
                                            EVs Rule
                                            • Apr 2011
                                            • 32560
                                            • UK
                                            #71
                                            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                            TPVFG and TPVAD will do for now. I forgot this set has buffers on SN board so you can't easily probe some of the points you can on other sets. Do you have a nice high res shot of SN board?
                                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                              Comment

                                              • WHaThEFLuX
                                                Badcaps Veteran
                                                • Feb 2015
                                                • 277
                                                • USA
                                                #72
                                                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                I can get one, give me a sec........TPVFG is reading 175V and and TPVAD is reading 30V.
                                                "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                                -retiredcaps

                                                  Comment

                                                  • WHaThEFLuX
                                                    Badcaps Veteran
                                                    • Feb 2015
                                                    • 277
                                                    • USA
                                                    #73
                                                    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!



                                                    Attached Files
                                                    "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                                    -retiredcaps

                                                      Comment

                                                      • tom66
                                                        EVs Rule
                                                        • Apr 2011
                                                        • 32560
                                                        • UK
                                                        #74
                                                        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                        You have multiple problems then. VFG should measure closer to 100V, and the -VAD should be around -180V to -220V.
                                                        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                          Comment

                                                          • tom66
                                                            EVs Rule
                                                            • Apr 2011
                                                            • 32560
                                                            • UK
                                                            #75
                                                            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                            What voltage do you get across those two blue caps, top right of SN board? (Voltage across any one - doesn't matter which, they're in parallel)
                                                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                              Comment

                                                              • WHaThEFLuX
                                                                Badcaps Veteran
                                                                • Feb 2015
                                                                • 277
                                                                • USA
                                                                #76
                                                                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                                ok, @tw2005, can you walk me through how I go about testing those voltages to be sure?
                                                                Last edited by WHaThEFLuX; 03-03-2015, 03:09 PM.
                                                                "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                                                -retiredcaps

                                                                  Comment

                                                                  • tw2005
                                                                    Badcaps Legend
                                                                    • Oct 2011
                                                                    • 6458
                                                                    • Australia
                                                                    #77
                                                                    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                                    Originally posted by WHaThEFLuX
                                                                    ok, @tw2005, can you walk me through how I go about testing those voltages to be sure?
                                                                    run with Tom and see where it goes. All I can tell you is what is in the schematics. vsus 215-220, TPSN1 147 +-5V, TPVAD 205 +-5V.

                                                                      Comment

                                                                      • WHaThEFLuX
                                                                        Badcaps Veteran
                                                                        • Feb 2015
                                                                        • 277
                                                                        • USA
                                                                        #78
                                                                        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                                        Voltage across blue caps = ~200V
                                                                        "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                                                        -retiredcaps

                                                                          Comment

                                                                          • WHaThEFLuX
                                                                            Badcaps Veteran
                                                                            • Feb 2015
                                                                            • 277
                                                                            • USA
                                                                            #79
                                                                            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                                            Since TPVAD is reading low at around ~30V, any idea what the problem could be?
                                                                            "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                                                            -retiredcaps

                                                                              Comment

                                                                              • tom66
                                                                                EVs Rule
                                                                                • Apr 2011
                                                                                • 32560
                                                                                • UK
                                                                                #80
                                                                                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                                                                I haven't read the whole thread, but did you replace a few transistors? If so, and your ERC voltage is at 200V, then I would suspect the driver chip for the ERC IGBT is stuck HIGH. I had that on my set (I did not power it up with the fault though.) This will cause all sorts of problems... I would suggest you replace all the driver ICs and small transistor pairs for any set of IGBTs that have failed.

                                                                                BTW, ERC should measure ~Vs/2 (or around 100V) when working. You can confirm by measuring SS board. They should match each other, within a few volts.
                                                                                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                                                                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                                                                  Comment

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