TCL 55S401LHAA No Power

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Tech06
    New Member
    • Oct 2018
    • 9
    • United States

    #1

    TCL 55S401LHAA No Power

    This TV was Brought to me in non working condition. There are no power\standby lights on the set at all. Here is what I have done so far.

    1. Took back off of the tv and tested that the system was getting AC voltage at the plug.
    2. Tested the fuse on the power board.
    3. Tested the DC voltage at the Large Capacitor.(170Vdc)
    4. Checked for any obvious burn marks bad solder joints.
    5. Unplugged various devices from the main board.(Tcon, Wi-fi module,)

    I'm not getting any response from the set at all. When I measure voltage between the Main Board and the Power Board I am only seeing between .1-.23 vdc on some of the pins. That seems low to me.

    Any Ideas? Thanks in Advance.
    Attached Files
  • lotas
    Badcaps Legend
    • Jan 2016
    • 4580
    • Russia

    #2
    Re: TCL 55S401LHAA No Power

    Power Supply TCL 01-L14TH4-PWB
    Attached Files

    Comment

    • RDC55
      Senior Member
      • Dec 2017
      • 180
      • United States

      #3
      Re: TCL 55S401LHAA No Power

      Try posting the actual voltage measurements at the P2 connector on the Power Supply with the TV powered up. You need to label the pins as to nomenclature and pin number - unfortunately TCL seems to like to make it hard and put the pin assignments on the back of the boards.

      Comment

      • Tech06
        New Member
        • Oct 2018
        • 9
        • United States

        #4
        Re: TCL 55S401LHAA No Power

        Originally posted by lotas
        Power Supply TCL 01-L14TH4-PWB
        lotas, Thanks for the schematic. You wouldn't happen to have the entire Service Manual would you?

        Comment

        • Tech06
          New Member
          • Oct 2018
          • 9
          • United States

          #5
          Re: TCL 55S401LHAA No Power

          Originally posted by RDC55
          Try posting the actual voltage measurements at the P2 connector on the Power Supply with the TV powered up. You need to label the pins as to nomenclature and pin number - unfortunately TCL seems to like to make it hard and put the pin assignments on the back of the boards.
          With my meter set on 20vdc. I show no voltages on the P2 connector at all.

          Comment

          • RDC55
            Senior Member
            • Dec 2017
            • 180
            • United States

            #6
            Re: TCL 55S401LHAA No Power

            I believe even with the Power Supply disconnected from the Main you should still be making 12VDC. The PFC will be about 170 VDC until the main is connected and then it should be about 390 VDC any time the TV is plugged in.

            So I would say time to troubleshoot the Power Supply or find a replacement if it is not making 12 VDC with it disconnected from the Main.

            Comment

            • Tech06
              New Member
              • Oct 2018
              • 9
              • United States

              #7
              Re: TCL 55S401LHAA No Power

              So to update this. I did end up replacing the power supply a quite a few months back. The power supply was the issue at the time. It lasted less than a year. I now have the set back again this time with a different issue. The unit powers on and I can hear the system click through the menus but, now the backlight is not coming on at all. I thought there may have been a bad safety resistor but, after replacing that I still have no backlight on the set. I think I should just replace the thing at this point.

              Comment

              • neilc6
                Badcaps Legend
                • Nov 2015
                • 1550
                • Canada

                #8
                Re: TCL 55S401LHAA No Power

                TCLs have lots of backlight failures. Only 2 or 3 rows of LEDs on a TV that size. Panel may also be taped down making the replacement more difficult.

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12145
                  • U.S.

                  #9
                  Re: TCL 55S401LHAA No Power

                  guess you were too busy to report back that a new powerboard fixed the tv. PASS.

                  Comment

                  Related Topics

                  Collapse

                  • GLISIT
                    Asus Probook P5440UF-XB74 power issue
                    by GLISIT
                    Hi all,

                    TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!


                    I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!

                    A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about...
                    01-16-2025, 02:29 PM
                  • Document Archive
                    HP Pavilion Power Pavilion Power 15-cb009nl Notebook 15 Specification for Upgrade or Repair
                    by Document Archive
                    This specification for the HP Pavilion Power Pavilion Power 15-cb009nl Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 15-cb009nl boardview and Pavilion Power 15-cb009nl schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that...
                    09-06-2024, 05:59 AM
                  • Document Archive
                    HP Pavilion Power 580-187nz Pavilion Power i7-8700 Specification for Upgrade or Repair
                    by Document Archive
                    This specification for the HP Pavilion Power 580-187nz can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 580-187nz boardview and Pavilion Power 580-187nz schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification,...
                    09-12-2024, 02:15 PM
                  • meraklinetx
                    Asus Z97-a power cycle, no boot no cpu voltage
                    by meraklinetx
                    Hello, I have an asus Z97-A motherboard and it doesn't start which was working properly before, the problem isn't related by ram, ram slots or psu (I changed all and nothing work), the exact problem is when you switch it on , it starts and after 1 seconds (no boot or display picture) it's off and then on cycle continuously until you power it off from psu also it's responding to the power switch for turning it off if you keep pressing it 3 or 4 seconds (power button pin has 3.3v) , also when you start it with eatx 12v socket connected this is happening (power cycle also all voltages are resetting...
                    05-10-2023, 06:08 AM
                  • Document Archive
                    HP ZBook Power ZBook Power 15.6 inch G9 Mobile Workstation PC Mobile workstation Specification for Upgrade or Repair
                    by Document Archive
                    This specification for the HP ZBook Power ZBook Power 15.6 inch G9 Mobile Workstation PC Mobile workstation can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the ZBook Power 15.6 inch G9 Mobile Workstation PC boardview and ZBook Power 15.6 inch G9 Mobile Workstation PC schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on...
                    09-07-2024, 05:20 AM
                  • Loading...
                  • No more items.
                  Working...