Sharp Aquos LC-52D64U - Flashing Power

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • jbandy
    Member
    • Mar 2015
    • 18
    • USA

    #1

    Sharp Aquos LC-52D64U - Flashing Power

    I was able to get a Sharp Aquos LC-52D64U for free in a non working condition.

    When I originally powered it up, I was getting two blinks of the power light and one blink of the OPC Light (Power and OPC would blink once together, then Power would blink once by itself, then repeat). Voltage showed that with Inverter1 connected, it would never get 60V. If I unplugged connector LA1 (Which goes to Inverter 1), I would show 60V on the power supply, so I replaced two of the four inverters (Inverters 1 (RUNTKA327WJZZ) and (Inverter 3 RUNKA329WJZZ) and was able to power up and get picture/sound, etc. I noticed there's two small vertical lines (green and red) running the full length of the screen on the right hand side (Where Inverter 1 and Inverter 2 is installed) I'm thinking maybe that's a seperate issue (Bad tab bond?)

    On a cold start, I can turn it on and watch hours of movies, etc with it. If I turn it off and immediately turn it back on, every other row of tubes on the backlight looks like it's flickering, then the backlight goes completely out (can still hear sound) but then you hear a click and the tv turns off and the power light blinks on and off (single blink continuously)

    If I turn it off and let it sit for a few minutes, I can turn it back on and watch normally again for hours more.
    I have reset the Lamp Error count and the Monitor Error Cause Count and done a factory init from the service menu.
    Monitor Err Cause is continuing to increment when this happens but lamp error doesnt increment.
    Whats my next step in troubleshooting? Where should I be looking at? Inverters? Power Supply? Tubes?

    One other thing I've noticed, is sometimes, I can hear a high pitched hum come from either Inverter1 or Inverter2 (Might be both of them) Inverter1 is one of the boards i replaced.

    Below are the power voltages coming off the Power Supply Board

    LA2 Connector (Goes to Inverter 1)
    60V 61.4V (When Screen Flickers 61.3V)
    12V 11.9V - 12V (When Screen Flickers 11.9V)

    LA1 Connector (Goes to Inverter 3)
    60V 61.2V (When Screen Flickers 60.9V)
    12V 11.8-11.9V (When Screen Flickers 11.8V)

    Here are the voltages for the PD Connector when TV is Working.
    LNB 0V (No Cable)
    LNB-POW 0V (No Cable)
    LNB-CONT 0V (No Cable)
    PS-ON 2.6V
    AC-DET 2.9V-3.0V
    PNL-POW 3.2V
    SGND 0V
    BU5V 4.9V
    SGND 0V
    SGND 0V
    UR15V 14.6V
    UR15V 14.6V
    Attached Files
    Last edited by jbandy; 04-03-2015, 04:08 PM. Reason: Adding Pictures
  • jbandy
    Member
    • Mar 2015
    • 18
    • USA

    #2
    Re: Sharp Aquos LC-52D64U - Flashing Power

    BUMP! Anybody?

    Comment

    • jbandy
      Member
      • Mar 2015
      • 18
      • USA

      #3
      Re: Sharp Aquos LC-52D64U - Flashing Power

      Bump

      Comment

      • jbandy
        Member
        • Mar 2015
        • 18
        • USA

        #4
        Re: Sharp Aquos LC-52D64U - Flashing Power

        Bump

        Comment

        • jbandy
          Member
          • Mar 2015
          • 18
          • USA

          #5
          Re: Sharp Aquos LC-52D64U - Flashing Power

          Anybody?

          Comment

          • jbandy
            Member
            • Mar 2015
            • 18
            • USA

            #6
            Re: Sharp Aquos LC-52D64U - Flashing Power

            Cmon guys. Just need a little help. Not sure if I should take this whole thing apart and examine the CCFL's or what (That's a big job)

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Sharp Aquos LC-52D64U - Flashing Power

              Do you have capacitor tester to check the capacitance AND the ESR of those caps on the inverter boards? I would try new caps first before taking the panel apart, the caps will have to be replaced sooner or later anyway.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • kc8adu
                Super Moderator
                • Nov 2003
                • 8832
                • U.S.A!

                #8
                Re: Sharp Aquos LC-52D64U - Flashing Power

                any sign of pink lamps on cold start?
                i have one now 46" with a pink lamp and has problems once lamps warm up.
                if one is sick may as well replace all but with your lines i would run it till it dies for good.

                Comment

                • jbandy
                  Member
                  • Mar 2015
                  • 18
                  • USA

                  #9
                  Re: Sharp Aquos LC-52D64U - Flashing Power

                  Originally posted by budm
                  Do you have capacitor tester to check the capacitance AND the ESR of those caps on the inverter boards? I would try new caps first before taking the panel apart, the caps will have to be replaced sooner or later anyway.
                  All I have is a digital voltmeter. Bought inverters 1 and 3 off of ebay and that's what allowed me to actually power up the tv. Don't see any bulging caps, etc.

                  Comment

                  • jbandy
                    Member
                    • Mar 2015
                    • 18
                    • USA

                    #10
                    Re: Sharp Aquos LC-52D64U - Flashing Power

                    Originally posted by kc8adu
                    any sign of pink lamps on cold start?
                    i have one now 46" with a pink lamp and has problems once lamps warm up.
                    if one is sick may as well replace all but with your lines i would run it till it dies for good.
                    No, looks pretty white to me. I paused a blueray on a white screen (one of the attachments, not a perfect white screen, has a fade out to a skull or something). As far as the lines running up and down the screen, looks like tab bond issue to me. Was going to investigate that further if I had to take the screen completely apart (which I dread doing). Figured I would work on the tab bond at the same time I inspect the CCFL's, but wanted to get some opinions of you guys before I dive that deep. I can live with the lines, but it's bugging me that the tv is going into protection mode if I turn it off / back on after it's warmed up.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada

                      #11
                      Re: Sharp Aquos LC-52D64U - Flashing Power

                      I have had a problem with the a couple master (upper) inverter boards causing a flicker and shut down problem, I had another board to replace it with so I never did diagnose the problem to component level. I did check my other lower (slave) inverters and they were ok.

                      Comment

                      Related Topics

                      Collapse

                      • sefoster
                        Sharp Aquos Lc-80LE757U flashing Sharp on screen when plugged in
                        by sefoster
                        I have a Sharp Aquos LC-80LE757U that randomly made a loud popping noise when when watching TV one day. We found that the fuse blew and the thermistor. We ended up replacing the entire power supply board and have also replaced the TCON board. Now as soon as I plug the TV in it lights up and has the Sharp logo flashing on and off of the screen. If I unplug the ribbon cable from the TCON board to the main board I get the 2 long 5 short error code. Any ideas on where to go from here? We've tried resetting it but nothing has worked. If we plug it in and let it cycle through the flashing of the Sharp...
                        11-20-2022, 09:29 AM
                      • JFarm
                        Sharp Aquos LC-46E77UN inverter testing
                        by JFarm
                        I picked this TV out of a trash pile. When I plug it in I can hear the relay on the power supply “click” almost immediately, and then 7 seconds later there is another “click” and the power/OPC LEDs start to flash: two pulses on the power LED, one on the OPC LED. I didn't notice any sign of life from the backlight, but more on that below.....

                        The service manual () says this is a “DET_10V error: UR10V or A9V is not applied”, but after checking several voltages I believe the power unit is tripping off due to an overload as soon as the backlight tries to come on; this kills...
                        03-21-2021, 11:10 AM
                      • scubacamper
                        Sharp Aquos LC-70C6400U Half Screen Dark
                        by scubacamper
                        I found another post on this site the other day which has been very helpful in troubleshooting this issue I am having with my tv. The left half of the screen is dark, and the other half is VERY slow to generate it's image - and it only generates part of its image at that.
                        Based on this yt video, I have narrowed it down to an issue (short?) on the left side of the display, somewhere in the system of ribbon cables.
                        when I remove the bezel and the rear cover, I can get the image to display correctly by manipulating the ribbon cables on the left side which connects the left lower display...
                        05-03-2025, 12:19 PM
                      • dmcabs
                        SHARP LC-60LE640X display flashing white noise patches and totally dropping out randomly
                        by dmcabs
                        Hey guys,

                        I have a SHARP LC-60LE640X TV that has suddenly developed an intermittent fault of flashing white noise patches (appears like an Analog tuner off signal) and then totally dropping out.
                        This model I believe is also known as LC-60LE600U or LC-60LE640U in other regions.

                        FYI, a long time ago I was a component level repair tech for all consumer electronics and IT equipment.
                        I'm a bit rusty but still have ability to dig right down.

                        I measured all power supply lines and checked them for AC ripple voltage. Noting any lines that exceeded about...
                        09-21-2024, 11:09 AM
                      • JunkmanJimbo
                        sharp lc-65ub30u plays but screen is flashing on and off
                        by JunkmanJimbo
                        Hey guys! It has been awhile since I've been on here. I hope everyone is doing well. I just picked up this Sharp lc-65ub30u. It plays but the screen is flashing on and off. Other than that i seems to be a great tv. Any ideas what the problem might be? I haven't pulled the back off yet. I thought I would get some opinions first. Thanks in advance for any help you can offer.
                        09-07-2024, 09:45 AM
                      • Loading...
                      • No more items.
                      Working...