Hisense H55A6500UK backlight, sound but no display

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  • nomoresonys
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Glad to hear it.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    So just a quick update on this to close it off!

    T-con arrived and fitted and all working as it should be.

    Thanks again!

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    To be honest I was already working along those lines getting a cap from a tcon I have lying around, matching size/shape/color but have managed to source a replacement tcon for £3 incl p+p so think I shall wait for delivery.
    Bought a main too for £6.50 incl p+p but may not need that now! So for the cost of a tcon alone I'll have both in case they are needed.

    A very BIG THANKYOU to all once again for contributing!!!

    BRILLIANT WORK LADS!!!
    Last edited by notallbad; 05-06-2020, 02:09 PM.

    Leave a comment:


  • nomoresonys
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Good to hear, not sure if it's best policy but there's a guy on youtube that looks around for a cap in his scrap boards that's about the same size physically and uses it, can also measure it with a multimeter I guess.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    I dared! And it powered up, panel looks good too, Yippee!!!

    Powered if off quick.
    Last edited by notallbad; 05-06-2020, 01:23 PM.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    So, it would seem C177 was shorted.
    Removed C177 and the cap is shorted.
    The short across the other caps and the M8R340 has gone.
    Also on the reverse side, VD5 showed as a short, but also now gone.

    But what to replace it with? Its tied to the 12v rail. 0.1uf???

    Dare I try it without this cap attached?
    Last edited by notallbad; 05-06-2020, 12:16 PM.

    Leave a comment:


  • nomoresonys
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Originally posted by dick_barton
    it is possible that one of these caps are responsible for the short circuit.
    +10

    Leave a comment:


  • dick_barton
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Short across caps C238, C239, C177 and C176.
    It is possible that one of these caps are responsible for the short circuit.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    yh done that, no difference!

    Leave a comment:


  • neilc6
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Power up the tv with the tcon to panel ribbons connected one side at a time to confirm you dont have a panel fault.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Yh, I think buying a replacement T-con might be the best way to go!

    Leave a comment:


  • nomoresonys
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    That looks like a match, not sure on the postage, it just gave the rates to the U.S. when I clicked it: https://www.ebay.co.uk/itm/LVDS-TCON...EAAOSwgZ5cXu1e
    Last edited by nomoresonys; 05-06-2020, 08:30 AM.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    M8R340 or MBR340, top right. DMM on diode setting get a reading of 120 one way only.
    On the pcb pads get a short.
    Sorry, picture upside down.

    T-con disconnected from main and panel.
    Attached Files
    Last edited by notallbad; 05-06-2020, 08:13 AM.

    Leave a comment:


  • nomoresonys
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Are those shorts there with nothing connected to tcon?

    Leave a comment:


  • dick_barton
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Is the MR340 the correct number?
    https://tinyurl.com/y788q8ep and it appears to be a mosfet
    Where is it on the tcon? top or bottom?
    Last edited by dick_barton; 05-06-2020, 07:42 AM.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Yh 12v on both sides of fuse and 1.8v on vcc1.8 and 1.2v on FRC_1.2V1.

    Appears to be a short across VD8 - MR340, even with one side lifted the short exists between the pads, not the diode.
    Short across caps C238, C239, C177 and C176.
    Last edited by notallbad; 05-06-2020, 07:21 AM.

    Leave a comment:


  • nomoresonys
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    See if there's voltage on each side of tcon fuse, pos. probe on each side, neg. probe on chassis ground.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Yh, the backlights are definately on and bright.

    Disconnecting the T-con ribbons to the panel boards one at a time makes no difference, still no picture/menu.
    Last edited by notallbad; 05-06-2020, 06:31 AM.

    Leave a comment:


  • dick_barton
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    The backlight voltage appears low as per what's written on the psu.
    Can you clearly see the backlights are up nice and bright from the back of the panel?

    I have seen that you say the backlights and sound working but no picture.
    Last edited by dick_barton; 05-06-2020, 06:18 AM.

    Leave a comment:


  • notallbad
    replied
    Re: Hisense H55A6500UK backlight, sound but no display

    Theres 18v on VAmp on XP805 connector and 125v for the backlights on connector XP701.

    Leave a comment:

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