Sharp LC-80LE632U 2-5 blink code

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  • SdlewisSr
    replied
    Re: Sharp LC-80LE632U 2-5 blink code

    A little more background information. The initial blink code on this TV was (2-2) Power supply error 2 UR+13V error. I also noticed that buzzing sound in the PFC area. After checking the UR+13V filter caps and rectifiers and finding nothing wrong, I refreshed the solder joints on the major components (transformers, FET's, diodes, caps, large inductors). Then I took a look at the PFC and noticed that it was lower than I thought it should be and it fluctuated. When the PFC is off the voltage on the bridge rectifier/filter caps (C7220, C7222, C7223) was normal and did not fluctuate. When the PFC turned on the voltage on the filter caps fluctuated between 310v and 316v. Also the voltage on the bridge rectifier fluctuated between 150v and 220v. Even with this fluctuation the output voltages were stable and where they should be.
    After refreshing the solder joints I put the power supply board back on the TV. Now the 2-2 blink code was gone but the 2-5 showed up.
    Because of the 2-5 blink code, I check the T-Con/Panel. When I disconnected one or the other ribbon cable between the T-Con and Panel I still got the 2-5 blink code. When I disconnected both ribbon cables, the TV powered up as normal. The PFC remained the same. I expected the PFC to be around 380 - 400 volts, but it remained fluctuating near 300v.
    What I am wondering is if the PFC is too low to handle the 12v outputs when the T-Con/Panel tries to power up, and this is why it's giving the 2-5 blink code and not because the Panel is bad.
    Note: Though the PFC voltage does not increase when the TV comes up with the two Panel ribbon cables disconnected, the buzzing increases as the backlight intensity increases.
    Attached Files
    Last edited by SdlewisSr; 07-12-2021, 01:07 AM. Reason: I forgot to add images. So here they are.

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    • SdlewisSr
      started a topic Sharp LC-80LE632U 2-5 blink code

      Sharp LC-80LE632U 2-5 blink code

      I have a Sharp LC-80LE632U with a 2-5 blink code. I have narrowed it down to the T-Con/Panel. I get the error if both or either ribbon cable is connected between the T-Con and the Panel. If I disconnect both ribbon cables, I get no error and the TV powers up just fine.
      Does anyone know if this is a definite bad Panel or is there a chance that the T-Con could still be at fault?
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