Pansasonic P50S30 Solid Red LED - Repost

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Audioplus
    Senior Member
    • Feb 2012
    • 157
    • USA

    #1

    Pansasonic P50S30 Solid Red LED - Repost

    Powers up I guess, red led stays solid red, unit doesn't do anything, have to unplug to power down.
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: Pansasonic P50S30 Solid Red LED - Repost

    I would have just kept this all together as it's in progress. Locked solid may very well be shorted Vsus / SC board. Check Sc2 for short cct or disconnect Sc2 / Sc20 and try turn on again and see if it attempts to start up then sos blinks.

    Comment

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia

      #3
      Re: Pansasonic P50S30 Solid Red LED - Repost

      This is out of the ST30 guide, but quick summary of SOS changes for the 2011 models

      Shutdown but No Blink code - Power LED stays on (Check for Shorted Vsus* / Vda** / P15V

      Blink chart:
      NO BLINLK SOLID RED,
      LSI Error,
      Shorted Vsus Shorted Vda Shorted P15V

      In order of probability.

      SC - SS, P, A, Panel

      Red Solid LED (No Blink): LSI error. This condition is triggered when the power supply SOS-detect-signal is triggered during the startup process.
      Attached Files

      Comment

      • Audioplus
        Senior Member
        • Feb 2012
        • 157
        • USA

        #4
        Re: Pansasonic P50S30 Solid Red LED - Repost

        Thanks TW, what I get from the service manual is probability of a bad power supply, do you concur?

        Comment

        • Alastair E
          Chief Womble
          • Mar 2013
          • 1963
          • U.K.

          #5
          Re: Pansasonic P50S30 Solid Red LED - Repost

          More likely SC or SS board has a short on the Vsus line......
          TELEFIX

          How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
          http://www.irf.com/technical-info/appnotes/an-1088.pdf
          PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

          Comment

          • Audioplus
            Senior Member
            • Feb 2012
            • 157
            • USA

            #6
            Re: Pansasonic P50S30 Solid Red LED - Repost

            I disconnect the SC2/P2, SC20/A20, SS11/P11 as instructed and I get 8 flashes. I reconnect everything and disconnect the SC2/P2 and get 7 flashes, if I disconnect the SS11/P11 I get a solid red LED
            That's supposed to be telling me something, SC Board ?

            Comment

            • Alastair E
              Chief Womble
              • Mar 2013
              • 1963
              • U.K.

              #7
              Re: Pansasonic P50S30 Solid Red LED - Repost

              Have you checked the Vs line on both the SS and SC boards to deck for a short...?
              TELEFIX

              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
              http://www.irf.com/technical-info/appnotes/an-1088.pdf
              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

              Comment

              • Audioplus
                Senior Member
                • Feb 2012
                • 157
                • USA

                #8
                Re: Pansasonic P50S30 Solid Red LED - Repost

                Actually, when disconnecting the 3 cables as described, I get 8 flashes, indicating an A-Board or Vsus - P15 short. When I disconnect the individual cables, I get the 7 Blink on the SC, solid on the SS
                Thus indicating an A-Board fault?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Pansasonic P50S30 Solid Red LED - Repost

                  8 blinks should be SS, you sure it's A 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

                  • Alastair E
                    Chief Womble
                    • Mar 2013
                    • 1963
                    • U.K.

                    #10
                    Re: Pansasonic P50S30 Solid Red LED - Repost

                    Well--IF you're randomly unplugging stuff, and not confirming whether there's any SHORTS anywhere with a Multi-meter.......

                    All you are gonna do is confuse the matter looking for errors that dont exist--as you're making errors by disconnecting stuff!!
                    TELEFIX

                    How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                    http://www.irf.com/technical-info/appnotes/an-1088.pdf
                    PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                    Comment

                    • Audioplus
                      Senior Member
                      • Feb 2012
                      • 157
                      • USA

                      #11
                      Re: Pansasonic P50S30 Solid Red LED - Repost

                      I'm off to get my multi meter in my work van . . . .
                      I was just responding to the service manual Page 61 for Solid Red Failure indicating that after the 3 cables are disconnected, it is blinking 8 times. A-Board, Vsus or P15V correct?

                      Comment

                      • tw2005
                        Badcaps Legend
                        • Oct 2011
                        • 6458
                        • Australia

                        #12
                        Re: Pansasonic P50S30 Solid Red LED - Repost

                        The fact you go from solid led (locked mode) or SOS4 on start-up to 8 or whatever after you disconnect the Sc confirms you have Shorted SC board.

                        In the 2010 models, a dead short on Vsus produced SOS4 at start-up but with these they've changed that to what you are seeing now

                        Initially you said it was constantly restarting and I did suggest checking SC for short because that appears to be the most common fault with the 2011 range.

                        Now that you have revised that with locked solid LED, I think everyone here is on the same page and expected shorted Vsus somewhere.

                        8 blinks is correct for Sc20 removed, it's all in the guide. Either way when you start probing it's going to be on the panel boards and not A or PSu that's my gut feeling on this.
                        Last edited by tw2005; 10-02-2014, 02:59 PM.

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #13
                          Re: Pansasonic P50S30 Solid Red LED - Repost

                          The flow chart may not be 100% since it's for ST30, if it turns out to be A I'll eat my words, meter is the best way to be sure of what's what.

                          Comment

                          • Audioplus
                            Senior Member
                            • Feb 2012
                            • 157
                            • USA

                            #14
                            Re: Pansasonic P50S30 Solid Red LED - Repost

                            P11 on power board, Brown Pin 4 initial resistance reading is 20V, Pin 1 is around 1V or less

                            Comment

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia

                              #15
                              Re: Pansasonic P50S30 Solid Red LED - Repost

                              Originally posted by Audioplus
                              P11 on power board, Brown Pin 4 initial resistance reading is 20V, Pin 1 is around 1V or less
                              Got me confused, what's the meter on? resistance of 1 volt and 20Volts?

                              Comment

                              • tw2005
                                Badcaps Legend
                                • Oct 2011
                                • 6458
                                • Australia

                                #16
                                Re: Pansasonic P50S30 Solid Red LED - Repost

                                I gotta get ready for that other 4 letter word, work , there's plenty of help available from everyone.

                                Comment

                                • Audioplus
                                  Senior Member
                                  • Feb 2012
                                  • 157
                                  • USA

                                  #17
                                  Re: Pansasonic P50S30 Solid Red LED - Repost

                                  No short on Pin 1 of P2 and Chassis, There is a short on Pin 1 of SC Board & Chassis, there is no short on Pin 1 of SS Board and Chassis.
                                  Indicates a bad SC Board?

                                  Comment

                                  • Audioplus
                                    Senior Member
                                    • Feb 2012
                                    • 157
                                    • USA

                                    #18
                                    Re: Pansasonic P50S30 Solid Red LED - Repost

                                    Yes the meter's decimal point is fluctuating back and forth, the short is extremely low reading

                                    Comment

                                    • Audioplus
                                      Senior Member
                                      • Feb 2012
                                      • 157
                                      • USA

                                      #19
                                      Re: Pansasonic P50S30 Solid Red LED - Repost

                                      TW, Alastair & Tom
                                      As usual, thanks for your help Gentlemen!

                                      Comment

                                      • Audioplus
                                        Senior Member
                                        • Feb 2012
                                        • 157
                                        • USA

                                        #20
                                        Re: Pansasonic P50S30 Solid Red LED - Repost

                                        A local associate has commented that he thinks there could still be an upper buffer issue?

                                        Comment

                                        Related Topics

                                        Collapse

                                        • reessi
                                          Acer Alienware Nitro 5 (GH51G LA-L181P Rev: 1C) & Dell Alienware M15 (GDP50 LA-k452P Rev:1) - Both Shorted PCH (SRKMA)!
                                          by reessi
                                          Hello:

                                          I have both these laptops that appeared to have the same fault so I thought I would have a go at replacing the PCH as something to learn, they both are using the same PCH.


                                          I started on the ACER:

                                          Up on connecting power no signs of life but current is consumed from the bench power supply and the PCH is hot.
                                          All the caps on the top of the PCH are showing 0 ohms and the 3.3v rail is shorted.

                                          I followed the videos from Sorin, Electronics Repair School on Youtube heating from the bottom to install. I practised on around 10 scrap...
                                          10-29-2024, 11:31 AM
                                        • Yanleb
                                          Panasonic TC-P50S1 shorted TXNSC1EDUU (TNPA4782AB) SC Board
                                          by Yanleb
                                          Hi every one. I just want to share the successful repair of my shorted Panasonic TNPA4782AB SC board.

                                          I don't usually do it but so many parts were shorted that I decided to buy the ShopJimmy repair kit instead of sourcing each components individually. Here is the list of components the kit contained, with a remark indicating if I needed that part or not :

                                          D608, good
                                          D618 RF101L4S, good (See warning 1 below)
                                          D619 RF101L4S, good (See warning 1 below)
                                          D865 RF101L4S, shorted (See warning 1 below)

                                          IC464 Inverter HA MC74HC1G14, shorted...
                                          03-09-2020, 12:00 AM
                                        • modtool
                                          HP Victus 15-FA1025NL , board DAG3PAMB8D0 REV:D, shorted CPU DrMOS and n-mos
                                          by modtool
                                          Hi to all,
                                          the owner of this machine gave it to me after having opened it to take off the dust from the inside, telling me that after that it didn't start anymore.
                                          I found that one of the DrMOS (AOZ5016QI) on the CPUCORE was shorted between VIN and VSWH, and that one of the two n-mos connected to the power jack was shorted aswell.
                                          I unsoldered the two shorted components and verified that there were no other short circuits, then decided to power the mainboard, firstly with the lab power supply, then with its original HP 200w charger, but the behaviour is the same, the board starts...
                                          04-01-2025, 08:22 AM
                                        • BalkanBoy
                                          Dead Razer Blade 14 2022, shorted CPU?
                                          by BalkanBoy
                                          Hi,

                                          today I got Razer Blade 14, Ryzen 9 6900HX and RTX 3070Ti.

                                          Laptop was completely dead. I found shorted CPU VRM mosfet, shorted 19V mosfet and blown battery fuse.

                                          I replaced it all, but still on CPU coil where mosfet was shorted I got very low resistance, near 0 ohms. On other CPU coils I got around 3 ohms.

                                          Laptop now raises voltage on whole board, but still nothing comes on the screen. CPU gets 0.7V on all coils except the shorted one. CPU gets only slightly hot, below 40 C.

                                          I removed coil and injected 0.7V, it draw around...
                                          09-27-2024, 12:44 PM
                                        • barry101
                                          Apple 820-3662 VCore shorted to ground.
                                          by barry101
                                          Hi, Would appreciate some help.
                                          I have an Apple Late 2013 15" A1398 MacBook Pro with Logic Board 820-3662.
                                          Get charger light but no fan spin or chime. No liquid damage.
                                          Found PPBUS and VCORE both shorted to ground. Other rails were ok.
                                          Removed VCORE MOSFETS U7310, U7320 and U7330. Found U7330 was in fact shorted.
                                          With the 3 MOSFETS removed, get PPBUS and fan spin. VCORE is still hard shorted to ground (0 ohms).
                                          Attempted voltage insertion on VCORE to locate short using bench supply set at 1.0 VDC and 4.95 Amps (max current for my...
                                          06-24-2025, 07:34 AM
                                        • Loading...
                                        • No more items.
                                        Working...