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Grundig 65 GUW 7060

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    #1

    Grundig 65 GUW 7060

    Hi guys, i hope i get some help with my tv as i dont want to just throw it away
    Basicly if its turned off for some time and cold, i can turn it on and it works 10-15 min, and then it turns off backlight, if i switch it off and on back it works again and goes off but each time in shorter period of time, there is image in background when it turns off so i gues its back light.

    So now to the point, i cant find ANY info abaut wich backlight is in this tv, and no disasembly videos, i have done one tv before by my self and repaired it, it works till this day, so now would like to try this one too....im hobyst weekend electronics guy and i have some simpler tools for repairs, like heating station, workstation etc, have alot of patience, only if i could get some help on what im looking at, is my problem with this tv realy backlight, and what kind of backlight is it so i can order it before begining work...
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    #2
    So i opened back of tv and on power suply there is marking like on image im uploading,,,LED 67v==========154V/650mA/max 71W
    And when i test on 2 wires going to backlight with multimeter im geting 139.1V DC it works short time and then turns off backlight, video is still there and when i usse remote there is menu click sounds, im thinking its probably one led diode failed and there is some other with interiminent failure , it works and when heated it goes of, and power suply is compensating for one thats why its on 139V and when next diode fails it trigers protection from power suply...

    Pls if anyone could help me a bit what im looking at, should i change powersuply, or its backlight?

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      #3
      3 Photos

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        #4
        I use a led tester to test the lines. Generally this will tell you if there is a problem.

        I'm not familiar with this model and can't tell you where to get LEDs... But if you can't find them

        You can open the TV up to the LEDs, find the burnt one and use a jumper on it and it will skip the dead one essentially. I do this when I don't plan on selling the TV or can't find parts and I generally just give it away. As far as I know they still working

        Comment

          #5
          Originally posted by EazyBone View Post
          I use a led tester to test the lines. Generally this will tell you if there is a problem.

          I'm not familiar with this model and can't tell you where to get LEDs... But if you can't find them

          You can open the TV up to the LEDs, find the burnt one and use a jumper on it and it will skip the dead one essentially. I do this when I don't plan on selling the TV or can't find parts and I generally just give it away. As far as I know they still working
          If i connect led tester to connector of led strips, it should automaticly adjust to how much power it needs and i can leave it longer time there will be no damage to leeds, becouse i want to test will it shut off after some time ?

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            #6
            I have done this before yes. I was trying to diagnose the lights or potentially the power board. I left it on there for about an hour. And yes the LEDs tester adjusts to the lights. I can't see your clip, if there is two line of lights you can use tester and for example one will say 33 v and other says 30v then it's likely LEDs. If there is only 2 wires that runs all LEDs then yes your test is valid.

            Take a pic of your connector

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              #7
              Click image for larger version Name: Connector.png Views: 21 Size: 464.4 KB ID: 3581260
              Originally posted by EazyBone View Post
              I have done this before yes. I was trying to diagnose the lights or potentially the power board. I left it on there for about an hour. And yes the LEDs tester adjusts to the lights. I can't see your clip, if there is two line of lights you can use tester and for example one will say 33 v and other says 30v then it's likely LEDs. If there is only 2 wires that runs all LEDs then yes your test is valid.

              Take a pic of your connector
              its connector with 4 wires in square

              Comment

                #8
                Okay yeah, you can put the led tester on the connector (not connected to PSU) and leave it to see what happens. It's not necessarily a perfect test as people here will say it doesn't produce the same amount of amperage to make it fail sometimes... But so far I haven't found that to be true with my tester. Although I'm not a repair shop with endless volume

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                  #9
                  Originally posted by EazyBone View Post
                  Okay yeah, you can put the led tester on the connector (not connected to PSU) and leave it to see what happens. It's not necessarily a perfect test as people here will say it doesn't produce the same amount of amperage to make it fail sometimes... But so far I haven't found that to be true with my tester. Although I'm not a repair shop with endless volume
                  Tested with led tester, backlight worked 2 hours all fine, i dismantled panel and there was all strips working when tested individualy, then i saw on one strip black resistor or something near connector, i changed all strips for new set, and all working fine and great....
                  One more electric device not going to landfill....

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                    #10
                    Well done

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