TH-42PZ70BA 10 bllinks not intermittent

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6457
    • Australia

    #21
    Re: TH-42PZ70BA 10 bllinks not intermittent

    Originally posted by tom66
    Fixed it was that thermal fuse.
    cool, which one? so the TV runs now, no blinks. That's one to learn from.

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: TH-42PZ70BA 10 bllinks not intermittent

      One embedded in VSUS transformer.

      Runs great, has 8000 hours on it. No burn in, no maldischarge.

      Probably going to tweak black level down, it's quite a lot higher than my PZ80. But it is also a lot brighter. Then again it's rated for around 600W instead of 470W.
      Attached Files
      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

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6457
        • Australia

        #23
        Re: TH-42PZ70BA 10 bllinks not intermittent

        not shown in the schematic? you're a clever dick.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: TH-42PZ70BA 10 bllinks not intermittent

          It is...
          Tested at 20Megs so pretty close to open circuit.

          No load current flows through it, purely a thermal sensor. Odd that they'd bother, given all the other sensors. Just used a spare thermal fuse from my parts bin.

          And it's per that other memory of that video:
          http://www.youtube.com/watch?v=qQ_iLxx3Fj4
          Attached Files
          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

            #25
            Re: TH-42PZ70BA 10 bllinks not intermittent

            Black level maybe 10% lower, not much room for tweaking:

            Vsus: 208V
            Vset: 362V (factory)
            -Vad: -130V
            Vscn: 136V
            Ve: 155V
            Vda: 75V (factory)

            Vda only rises after a few seconds of fans running.
            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

            • vinceroger69
              Badcaps Legend
              • Mar 2012
              • 6714
              • uk

              #26
              Re: TH-42PZ70BA 10 bllinks not intermittent

              cool glad you fixed it tom thats a good you tube video showing the fault with those transformers at least u will know next time if you get the same fault how do you check how many hours they have run as will check mine.
              Last edited by vinceroger69; 03-03-2014, 05:27 PM.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: TH-42PZ70BA 10 bllinks not intermittent

                Checking hours:
                Hold VOL-/CH- on TV
                Press "0" three times on remote
                Release VOL-/CH-

                After a few flickers, the service display appears.

                The hours and minutes are shown under "Time", bottom right corner. The "Count" is the number of turn on/off cycles (on some models, this also includes the standby DVB guide update as well as record mode, so can be very high.)

                I had over 13,000 hours on one set, still playing great.

                To exit display, turn off TV.
                Last edited by tom66; 03-03-2014, 05:21 PM.
                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

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk

                  #28
                  Re: TH-42PZ70BA 10 bllinks not intermittent

                  cheers tom will check tomorrow.

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #29
                    Re: TH-42PZ70BA 10 bllinks not intermittent

                    Diagnosis video:
                    https://www.youtube.com/watch?v=mBw8q33pqj4
                    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

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6457
                      • Australia

                      #30
                      Re: TH-42PZ70BA 10 bllinks not intermittent

                      I got a Q because I'm not getting something. If the fuse was in T201 vsus, how does that tie on with T301 for Vda? I have not watched the video yet.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #31
                        Re: TH-42PZ70BA 10 bllinks not intermittent

                        Has nothing to do with it - it was waiting for Vsus to rise, could not see it rise so then dying. So it never got to fire up Vda. Vda only comes up after a second or so of fans spinning.

                        The fuse is only an indicator, it does not carry any load current.
                        Last edited by tom66; 03-04-2014, 05:06 AM.
                        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

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6457
                          • Australia

                          #32
                          Re: TH-42PZ70BA 10 bllinks not intermittent

                          Originally posted by tom66
                          Has nothing to do with it - it was waiting for Vsus to rise, could not see it rise so then dying. So it never got to fire up Vda. Vda only comes up after a second or so of fans spinning.

                          The fuse is only an indicator, it does not carry any load current.
                          Yep, just got to the juicy bit about the sus out sense. That's a very tricky one. Really impressed

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #33
                            Re: TH-42PZ70BA 10 bllinks not intermittent

                            Wouldn't have happened without Gavin's video 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

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6457
                              • Australia

                              #34
                              Re: TH-42PZ70BA 10 bllinks not intermittent

                              Still a good effort, real nuts and bolts diagnostics. Makes me wonder with the recent SOS12 15Vsound missing if there's something to be learnt with a sense line missing?

                              Pity about the money spent on the DG, at least the final remedy was nil.

                              It was interesting theory about the SOS blinks and the hierarchy. I often wonder about that myself ever since I had that 4 blink masking a 1 blink.

                              I do think though it all depends at what part of the startup sequence something is detected.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: TH-42PZ70BA 10 bllinks not intermittent

                                I have returned the board to seller who accepts fault-free returns with no restocking fee (only pay postage.) I was able to test it for them and confirm it is fully working too as I put my original DG back in and everything works.

                                Interestingly both boards had near same hours - 8000 hours vs 7850 hours.
                                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

                                • tw2005
                                  Badcaps Legend
                                  • Oct 2011
                                  • 6457
                                  • Australia

                                  #36
                                  Re: TH-42PZ70BA 10 bllinks not intermittent

                                  Originally posted by tom66
                                  I have returned the board to seller who accepts fault-free returns with no restocking fee (only pay postage.) I was able to test it for them and confirm it is fully working too as I put my original DG back in and everything works.

                                  Interestingly both boards had near same hours - 8000 hours vs 7850 hours.
                                  Bonus, I guess you're regular customer. Win all round. It's good to hear.

                                  Comment

                                  • vinceroger69
                                    Badcaps Legend
                                    • Mar 2012
                                    • 6714
                                    • uk

                                    #37
                                    Re: TH-42PZ70BA 10 bllinks not intermittent

                                    Originally posted by tom66
                                    Checking hours:
                                    Hold VOL-/CH- on TV
                                    Press "0" three times on remote
                                    Release VOL-/CH-

                                    After a few flickers, the service display appears.

                                    The hours and minutes are shown under "Time", bottom right corner. The "Count" is the number of turn on/off cycles (on some models, this also includes the standby DVB guide update as well as record mode, so can be very high.)

                                    I had over 13,000 hours on one set, still playing great.

                                    To exit display, turn off TV.

                                    time 11808:30 so not bad at all

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #38
                                      Re: TH-42PZ70BA 10 bllinks not intermittent

                                      yep about 12,000 hours; these panels should reach 50,000 hours easily.
                                      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

                                      • vinceroger69
                                        Badcaps Legend
                                        • Mar 2012
                                        • 6714
                                        • uk

                                        #39
                                        Re: TH-42PZ70BA 10 bllinks not intermittent

                                        cool thats good to here good job also to the people who take time to do the you tube videos showing these fixes imo.

                                        Comment

                                        • tn245
                                          Badcaps Veteran
                                          • Oct 2013
                                          • 530
                                          • UK

                                          #40
                                          Re: TH-42PZ70BA 10 bllinks not intermittent

                                          Out of interest tom, how much would you want/expect to sell this one for?

                                          Comment

                                          Related Topics

                                          Collapse

                                          • Tynan Dill
                                            Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                            by Tynan Dill
                                            I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                            Upon bringing it home and plugging it up, it showed a standby light.

                                            I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                            The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                            With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                            Assuming...
                                            11-22-2024, 01:46 PM
                                          • m1ch43lzm
                                            HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
                                            by m1ch43lzm
                                            Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
                                            Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
                                            05-12-2025, 08:37 PM
                                          • C152Heavy
                                            Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
                                            by C152Heavy
                                            Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board

                                            Summary for TL-DR readers:
                                            • Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
                                            • Have obtained Samsung schematic & service documents - Can upload if helpful.
                                            • Have read ALL applicable threads
                                            • C1818 and CP820 replaced as low hanging fruit
                                            • CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
                                            • VCC pin (18) of PFC...
                                            01-11-2023, 02:53 PM
                                          • Hakuu
                                            LG OLED77G1PUA - No Video / Audio after a TCON Board change and Software Update
                                            by Hakuu
                                            Hi There,

                                            This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.

                                            After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.

                                            More Details

                                            TV Model - LG OLED77G1PUA

                                            Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt...
                                            07-12-2023, 02:37 PM
                                          • jb_Bak
                                            Sony xbr-65x900c main board issues?
                                            by jb_Bak
                                            Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.

                                            Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
                                            Power Board Connector that goes to Main board
                                            CN6401
                                            Pin 01 NC
                                            Pin 02 NC
                                            Pin 03 "BL_ON": 0V
                                            Pin 04 "N/C"
                                            Pin 05 "STBY 3.3V": 3.5V
                                            Pin 06 "GND": N/C
                                            Pin 07 "AC_OFF"...
                                            09-27-2021, 04:52 PM
                                          • Loading...
                                          • No more items.
                                          Working...