Electronics > Repair

Tektronix DPO7104 repairs

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pasta2018:
I guess the Q631 or Q632 is fault.The two pin resistance of each one is not the same,while Q631 is about 2k,and Q632 is infinity.
It,s marked with 2A X,it's MMBT3906,a PNP transistor.

coromonadalix:
i would say  clean your pcb

it is crusty  and that could cause problems if it continues and humidity goes in that

pasta2018:
I don't know what to clean well. I tried cleaning with water or alcohol and it didn't seem to work. It looks very clean when it gets wet, and it looks like this when it's dry.

iAleks:

--- Quote from: pasta2018 on December 14, 2024, 01:15:34 pm ---I guess the Q631 or Q632 is fault.The two pin resistance of each one is not the same,while Q631 is about 2k,and Q632 is infinity.
It,s marked with 2A X,it's MMBT3906,a PNP transistor.

--- End quote ---
No, this is some N channel mosfet. Fan current 0,52A. You need some mosfet with similar parameter Vthreshold

pasta2018:
Oh my god, thanks! Can you tell what is marked on Q631 of your scope? Mine is 2A XK8

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