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820-3432 no lcd

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  • #31
    Originally posted by larossmann View Post
    Replace U7090 , solder it properly.
    replaced u7090 and no change. I tested each point to confirm there were no short on the chip and it was soldered correctly

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    • #32
      No, something is wrong here. If you have 18v on SHDN pin, 18v on VIN, and no short to ground on output... no. You're screwing something up that you're not telling us. Please tell us.

      Some more.

      1) Is the voltage on VIN pin of U7090 STABLE, or does it go up and down?

      2) Are you measuring for a short to ground on L7095 with power plugged in? If so, DON'T! Measure without power plugged in.

      3) Where did this U7090 chip come from?

      4) Are you using too much heat and roasting it?

      5) Are you sure this is soldered properly?

      There is not much to this.

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