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Hisense 75h8f shutting off

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    Hisense 75h8f shutting off

    This TV turns on you see the Android logo it loads goes to home screen will stay on the home screen for about 30 seconds to a minute roughly and then clicks the relay on the PSU and shuts off.

    It's a q LED and I've tested the LEDs to the best of my ability using the ribbons and an LED tester and they are all 22 volts on all three channels of the ribbon. I do know LEDs failing and cause this issue. I don't think it's this but maybe.

    Have disconnected 3/4 on both sides of the ribbon and one half on each side of the ribbon and the entire panel itself. And it does the same symptoms and it always gives a picture when doing so. Except when the entire panel was disconnected(still shuts off same time though). I do not see any lines on the screen or anything. Nor do I see any damage to the screen and it has no bezel.

    I have found that apparently the main board dies a lot on this TV and I have found a repair service on eBay that lists my symptom. I figured I would write here and see if there's any suggestions on what I could test or something I could do.

    All voltages on the PSU are correct. The main caps have a proper voltage as well and hold voltage the whole time until it shuts off.

    I have also had the symptom similar before on different Hisense Google TVs. And I have updated through USB firmware and it has worked. Update will not allow to start on this TV. It literally does nothing instead of updating.

    Help?

    #2
    Android TV start steps. after it finish brand Logo, it will start 5V rail for USB / wifi .. etc.. remove wifi model...... check 5V VCC on any USB port

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      #3
      Yes I have a USB tester that shows voltage. You are correct only after startup does voltage show up and both usb show 5.24v.

      No change WiFi remove

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        #4
        then try inter android recovery... and leave it at recovery with out any option to choice see if it remain ON always... if it did stay on longer as the fault.... do hard reset from it

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          #5
          What is this? Like service menu? If you can tell me how to access, but I'll look how to

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            #6
            Originally posted by EazyBone View Post
            What is this? Like service menu? If you can tell me how to access, but I'll look how to
            surprise ?? you don't know what are Android recovery !!

            boot loader / recovery are 2 Parts saved on the eMMC / NAND out side the main firmware.. control the boot and the configuration of the main system.

            the idea are if this part we run it and it keep on... we will know the system partition bad. we can repair it by hard reset from recovery..

            in general Recovery partition we can call it by pressing on TV direct power and volume - keep pressing and plug it in wall.. release pressing until the brand logo displaying

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              #7
              Yup I don't know it. I haven't learned everything.. that's why I come here. I don't make many posts anymore as I generally fix the problems now.. so still need to learn.

              I've tried your method and looked on the web to get into the Android recovery and it won't go there. It just does nothing at all.

              I plug in holding those, white light turns on. Stays solid, does nothing. Similar when I try update from USB, holding power and plugging in the light just stays solid, and I can't even turn the TV on after attempting this either

              A side note. When the TV is plugged in and NOT on, the leds are very dimly lit and stay lit forever which is odd

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                #8
                Originally posted by EazyBone View Post
                A side note. When the TV is plugged in and NOT on, the leds are very dimly lit and stay lit forever which is odd
                its one SoC boards. not so complex to follow it
                could you list the V you have on this socket at time only plugged in wall
                also you can unplug the socket on MB which it go to LED driver boards... they will lit very dim at time the tV ON

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