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820-3462 No Caps Lock light

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  • 820-3462 No Caps Lock light

    The Caps Lock light on this board doesn't work. Caps lock works but no light. I have tried different keyboards and still the same.

  • #2
    Liquid damage/corrosion, missing components?
    -look at caps lock led drive circuit(u5830 q5736 q5738 and q5734)
    -check continuity between pin 40 U5701 and pins 5&2 of U5730
    Last edited by jadao; 07-13-2017, 12:54 PM.

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    • #3
      Yes water damaged. My initial problem with the board was missing One wire 3,42V, but got that sorted. This board doesn't have any components of the LED drive circuit. I have already tried to replace U5701.

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      • #4
        Really who cares about the cap lock LED? It is simply driven from U5701, so either bad trace or resistor R5714 or bad connector.

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        • #5
          I do , Okey, thank you, I'll try the connector when I get back from my summer holiday. R5714 is fine.

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          • #6
            Juts leave it and avoid any further complications.

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