Missing capacitor - Radeon HD 7850 2Go- Which values to choose?

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  • fab13
    Senior Member
    • Dec 2021
    • 109
    • France

    #1

    Missing capacitor - Radeon HD 7850 2Go- Which values to choose?

    Hello to all

    I have a Sapphire HD 7850 2 go
    I would like to have a little information about a capacitor to add and its value.
    This graphics card turns on with fan running but no display in HMDI ouch.

    After checking on the boardwiew exact and precise and I have only the boardview.

    Indeed, it misses 3 capacitors of size 0402 of which 2 on the line +1.8 Volts is C1700 in 1 uF and 1 in C1704 on the line +1.8 V in 0.1uF
    Finally, the C2208 at 0.1uF on the +MVDD line


    My question is : However I do not have a 0.1uF capacitor so by what value can I add?By 100nF it is possible?
    I only have these and I don't have a doneuse card.
    Do you think it will not disturb the line?

    Last question =D what does the rail +MVDD mean?

    Thanks a lot in advance :grouper:
    Attached Files
    Last edited by fab13; 01-03-2022, 01:49 PM. Reason: Sentence error
  • fab13
    Senior Member
    • Dec 2021
    • 109
    • France

    #2
    Re: Missing capacitor - Radeon HD 7850 2Go- Which values to choose?

    I added 2 capacitors in 100 nF which replaces the 0.1uf and one of 1uF and the problem remains the same with a black screen no signal in HDMI. I checked the + 5V line in diode mode and everything drops around 0.500 Volts. And I tested the resistors at the outputs of the HDMI all the values are correct compared to the diagram. Ideas the team?

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