Dreamcast problems after power surge

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Tomas_B

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Hi!
I bought a Dreamcast that came in pieces in a bag :) i did put i back togheter and it fired right up! WOW! gold was my first tought,but when i put a disc in it after about 10-20 seconds the fan started to rev like crazy and the power led got brighter then i should. baaam it turned of before i could power it down.

the psu died, swapped in my working recapped psu from my other DC, it now powers on the fan spins normal the disc drive seems to work?, but i have no video or audio and also the vmu just beeps when powering on the console nothing more... i have checked fuses and transistors cant find anything wrong. for tv connection im using a hdmi adapter that plugs in the vga port i have confirmed it still working on my other dreamcast.

I think i have isolated the problem to the 2v side after IC104, because on ic104 i have 50 ohms between gnd and v-out = pin3 and 5. removed ic104 to confim if i was that chip or something else of course it was something after that... now im stuck any ideas where to go now?
 
Been facing a similar situation on my end, I bought 6 of Dreamcast consoles (mix of VA0 and VA1) all boards show 2v on the 3.3v rail (at the input pin, tp117, and at pin1 of ic104) , even after cleaning the pins or using tp117 as an injection point, the voltage at pin1 of the ic104 is 2v.
After removing the ic104 and testing the voltage at the pad where pin1 should be connected it shows ~3.2v
Did you manage to diagnose your problem? Or at least further steps I could take ? Or anyone who had a similar problem
 

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