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Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

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    Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

    Hello everyone. I'm trying hard to do a better job with my posts so this diagnostic was done STRICTLY BY THE NUMBERS! No short-cuts.

    I picked up this Sharp LC-60LE600U with the complaint the TV would not turn on. The ICON would illuminate as soon as the TV was plugged in then go out about 10 seconds later, no backlights. I ran the fault bypass procedure before purchase and got the backlights to flash.

    Voltage tests: Back at the shop I put the TV on a switchable power strip, switched it on and checked the main caps which rise to 405V then trail back off to 165V. The voltages below are reference chassis ground:

    CONNECTOR “PD”

    1….PNL_12V……..10V, rises to 11.84V, drops to 0
    2….PNL_12V……..10V, rises to 11.84V, drops to 0
    3….GND…………….Continuity to ground present
    4….GND…………….Continuity to ground present
    5….UR13.2V……...13.2V, drops to 0
    6….UR13.2V………13.2V, drops to 0
    7….UR13.2V………N/C
    8….UR13.2V………N/C
    9….GND…………….Continuity to ground present
    10....GND………….Continuity to ground present
    11….GND………….N/C
    12….GND………….N/C
    13….AC_DET…….3.3V, drops to 0V, raises back up to 2.15V
    14….PS_ON………2.06V remains constant with AC 120V applied
    15….BU5V………..5.03V remains constant with AC 120V applied
    16….PNL_POW…0V, raises to 3.26V, drops to 0V.
    17….PWM1………6/10V, raises quickly to 1.5V (max seen, varies), drops quickly to 0V
    18….N/C
    19….DIMMER…..N/C
    20….N/C
    21….OFL…………..N/C
    22….ERROR………3.29V, drops to 0V
    23….PWM2………N/C
    24….STB……………0V, raises quickly to 3.24V, drops quickly to 0V

    CONNECTOR L1 (backlight connector) IMPORTANT NOTE! Terminal 1-1 is on the RIGHT side of connector L1.

    Term#..........Voltage (L1 seated)……………………..Voltage (L1 disconnected fr PSU)

    1-1………83.5V, drops to 0V……………………………….….. 83.9V, drops to 0V
    1-3…..…10V, raises to 40V, drops to 0V………………...-66.5V, raises to 0V
    1-5……..83.5V, drops to 0V……………………………………. 83.9V, drops to 0V
    1-7……..10V, drops to -25.8V, raises to 0V……….……-66.5V, raises to 0V
    1-9……..78V, raises to 83V, drops to 0V………………... 80V, drops to 0V
    1-11……10V, raises to 40V, drops to 0V………………..-66.5V, raises to 0V
    1-13…….86.5V, raises to 150V, drops to 0V…………… 83.5V, drops to 0V
    1-15…… 10V, raises to 30V, drops to 0V……………....-66.3V, raises to 0V

    With that I tested the LED's at L1 with my backlight tester. It displays both volts and amps in the readout which are recorded below:

    1-1 to 1-3: LEDs illuminate, 91.9V, 36.6mA
    1-5 to 1-7: LEDs illuminate, 91.9V, 36.6mA
    1-9 to 1-11: LEDs illuminate, 91.9V, 36.6mA
    1-13 to 1-15: LEDs do not illuminate, 318V, 0mA

    So it looks like there's an open at the LEDs driven by pins 1-13 and 1-15…but what about that 150V spike on the same line? That didn't seem right so I pulled the PSU and had a look at IC7201 and all the components in-circuit with it.

    IC7201 is part number MP24830 and is described as a 4.5V – 90V Programmable Frequency White LED Driver, datasheet attached. The area of concern has to do with pins 3 (VDD) and 4 (INGND) of this IC. Between the circuits there is SMD MLCC capacitor location C7225. When testing across this cap or pins 3 and 4 of IC7201 it indicates short direct. When testing from pin3 or 4 to ground I get a low reading, .193 or so.


    Final diagnosis: Open LED's causing TV to go in to fault protect, possibly associated with shorted cap C7225 and/or IC7201.


    My concern is if I put backlights in and IC7201/C7225 are shorted that it will damage the new LED strip or the board itself.

    So here are my questions:

    It seems to me pins 3 and 4 of IC7201 should not be shorted since pin 3 is supply voltage and pin 4 is Input Ground Reference/Reference for the EN/DIM signal. Is this assertion correct?

    Could the 150V spike at L1/ 1-13 to 1-15 be the result of either shorted capacitor C7225 and/or shorted IC7201 on pins 3 and 4?

    The datasheet specifically calls for a capacitor to be placed on VDD and says “Needs C1 to prevent large input voltage spikes”. If I remove C7225 and find it short can I leave it off the board temporarily for a quick re-test, or should I replace the cap first?
    Attached Files
    They call me......."threadkiller"

    #2
    Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

    1) Are you using chassis GND to check Voltages at the LED connector?
    2) 1-13 to 1-15: LEDs do not illuminate, 318V, 0mA That indicates you have open circuit.
    You have 4 LED strings, each string has 34 LED's, since you drive the LED with only 30mA, the Vf of each LED will be about 2.7V so 34 x 2.7V = total Vf of 91.80 V. Vf of LED will vary with current applied.
    https://www.shopjimmy.com/catalogsea...rp+LC-60LE600U

    All Cathode returns are all tied together (LED 1 -, LED 2 -, LED 3 -, LED 4 -) and connected to PWM controller MOSFET Q7202 (Driven by LED driver IC7201 pin 11) and current sensing resistor to circuit GND.
    The boost converter circuit (IC7201 (MP24830), Q7201, L7204, D7214) output is connected on the low side of the LED high side power supplies (4 on the cold side) generated by T7601, basically stacking output setup (the negative of the 4 power supplies are connected to the Boosted power supply +).

    https://www.shopjimmy.com/sharp-runt...led-board.htm#
    Sharp RUNTKB057WJQZ (DPS-168JP A)
    Last edited by budm; 01-26-2019, 10:39 PM.
    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


      #3
      Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

      So as good fortune would have it today I went and picked up an LC-60LE640U. I couldn't get it to turn on due to a broken screen and fault code 2-5. I got it back to the shop here, unhooked the FFC from the right side of the screen and got it to fire up. The display shows a partial picture and the backlights come on and stay on.

      Here's where it gets interesting: The 640 has panel number R1LK600D3GV0AZ and is a smart TV. The 600 has panel number R1LK600D3GV0BZ and isn't smart. Those part numbers are almost identical, so I was wondering if anyone knows whether the 600's "B" panel will interchange with the 640's "A" panel?
      They call me......."threadkiller"

      Comment


        #4
        Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

        Ok so I've been trying to self-help on this a bit. Here's what I've learned.

        According to Encompass.com the LC-60LE600U model display panel is used in the 600 only. This is the TV with the intact panel.

        For the LC-60LE640U, Encompass did not have a part number available, but it does have T-CON no. duntkf975fm01. ShopJimmy shows this as an option for both models of TV but only lists the "A" as a potential display panel number. This is the TV with the broken panel.

        https://www.shopjimmy.com/sharp-dunt...-con-board.htm

        Presently the 600 has timing control board duntkf908fm04 and shows to be for the 60 and 70 inch, 600 model only..

        https://www.shopjimmy.com/sharp-dunt...c-70le600u.htm

        So if I'm making the right assumptions here it looks like the 600's "B" panel could be used with the 640's present T-CON board. If it can:

        I guess the remaining question is will the 640's main board support that set-up? If it will the 600's panel should work if I leave the 640's t-con alone and plug the "B" panel in to it?
        They call me......."threadkiller"

        Comment


          #5
          Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

          So you have one panel that one of the LED string is not reading right, then you have another model with broken screen (I couldn't get it to turn on due to a broken screen), so now you are concentrating swapping LCD panel.
          So you are not going to find out first why the LCD panel (not cracked panel) LED is not reading correctly?
          I do not understand which problem you are trying to fix first.
          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


            #6
            Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

            The 640 is smart TV so I was thinking of using the 600 for parts to fix it.
            They call me......."threadkiller"

            Comment


              #7
              Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

              I intend to try and put one of these together today. Does anyone know if the R1LK600D3GV0BZ panel in the LC-60LE600U will work in place of the R1LK600D3GV0AZ panel in the LC-60LE640U??
              They call me......."threadkiller"

              Comment


                #8
                Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                So with no opinion given in here on panel compatibility I installed the 600's panel in the 640 after visually comparing the source driver boards which in appearance and board number were identical. I went over it component by component and the same appearing components were found in the same location across all 4 boards.

                End result....for at least a bit the left half of the panel was visible. The left quarter of the screen was normal, the next quarter to the right looked like an LVDS cable problem, the next quarter to the right was discolored but closer to normal and the right quarter of the screen was and always has been vertical lines. The left quarter of the screen is still normal but the problems spread and the final result is pictured.

                The vertical lines on the right side of the screen were present from the instant the panel got power. Ordinarily I'd say bad panel just on that alone but since the panel numbers are different there may not be any telling. At least in this thread anyways.

                So does anyone think this is fixable?

                Oh well, you win some and you lose some!
                Attached Files
                They call me......."threadkiller"

                Comment


                  #9
                  Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                  I could not find any spec. sheet for either panel any where to what the difference are.
                  Do the two T-CON boards have the PCB and PCBA numbers?
                  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


                    #10
                    Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                    Originally posted by budm View Post
                    I could not find any spec. sheet for either panel any where to what the difference are.
                    Do the two T-CON boards have the PCB and PCBA numbers?
                    There's no specific callout on the board for either PCB or PCBA number. Here's a pic of both T-CONs, can you tell me where that number is or see it by chance?

                    The 640's T-CON is the first picture.
                    Attached Files
                    They call me......."threadkiller"

                    Comment


                      #11
                      Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                      So both tvs are 4k?

                      Comment


                        #12
                        Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                        I think they are too old to be 4K, about 2012 model
                        They call me......."threadkiller"

                        Comment


                          #13
                          Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                          The two T-CON boards are not even close to be the same at all, the blank board P/N which are white silkscreen on to the board and the board layout are not even close to be the same.
                          If the two LCD panels are really close they would have use the same blank board and then stuffed with different parts for needed LCD panel number.
                          One board has sticker with 'DUNTKF975WE01' but the other one on the other board I cannot read. Also look at the numbers on the long sticker too: F975??????, F908????
                          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


                            #14
                            Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                            Originally posted by budm View Post
                            The two T-CON boards are not even close to be the same at all, the blank board P/N which are white silkscreen on to the board and the board layout are not even close to be the same.
                            If the two LCD panels are really close they would have use the same blank board and then stuffed with different parts for needed LCD panel number.
                            One board has sticker with 'DUNTKF975WE01' but the other one on the other board I cannot read. Also look at the numbers on the long sticker too: F975??????, F908????
                            Well the question of panel and T-CON interchangeability has been answered. The panels and t-cons are not interchangeable. I re-configured the 640's chassis with the 600's outer bezel, main and timing control board with all accessories, wiring harness and LVDS cable. End result:
                            Attached Files
                            They call me......."threadkiller"

                            Comment


                              #15
                              Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                              Ok, cool, didn't have to deal with the faulty backlights in the 600.
                              Last edited by nomoresonys; 01-29-2019, 12:25 AM.

                              Comment


                                #16
                                Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                                Originally posted by nomoresonys View Post
                                So it's basically a 600 then, no smart features but working tv?
                                Yes, it's the equivalent of a LC-60LE600U, not smart but appears to be working good!

                                And thank goodness I didn't cook the panel with my little day-long experiment!
                                They call me......."threadkiller"

                                Comment


                                  #17
                                  Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                                  Originally posted by nomoresonys View Post
                                  Ok, cool, didn't have to deal with the faulty backlights in the 600.
                                  Well actually I did have to deal with them.... but in a super-round-about way lol

                                  The chassis are identical as are the part numbers on the backlights. Either way the LCD had to come out, so why not leave the backlights in the 640's chassis and swap the 600's panel to it? I thought worse come to worse the panels are not compatible, I re-gut the chassis with 600 parts and wind up with a non-smart TV.

                                  Smart or not, these old Sharps are still awesome TV's, and I only have $40.00 in both plus parts to sell or use! Even better when I picked up the 640 I also got a Samsung PN50A510 and a Panasonic 50" 1080 plasma for $10.00 more at the same place.
                                  They call me......."threadkiller"

                                  Comment


                                    #18
                                    Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                                    Have a sharp Aquos lcd from 2007 or 8 only flat panel tv I bought new, great tv, never had a bit of trouble with it, just blow out the dust every month or so, still going strong.

                                    Comment


                                      #19
                                      Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                                      Originally posted by budm View Post
                                      I could not find any spec. sheet for either panel any where to what the difference are.
                                      Do the two T-CON boards have the PCB and PCBA numbers?
                                      So the TV has been going for one day now and all looks good. budm, I was wondering if you found this post acceptably better than others I have made, and as always I appreciate your time and help. Thank you!
                                      They call me......."threadkiller"

                                      Comment


                                        #20
                                        Re: Sharp LC-60LE600U tries to turn on, faults, DIAGNOSTIC DONE BY THE NUMBERS!

                                        What is the fault bypass procedure?

                                        Thanks!

                                        Comment

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