SNES with no image and no sound. Checked everything...

Everything I could think of, caps, cartridge slot, everything is good. there are two caps that wouldn't retain current... I changed them and still they don't retain current, when I get them off of the MB they do "charge" up.

At this point I'm assuming the CPU or something like this is dead.

if you have any idea why these caps don't retain current could you please give me some pointers?

here is the location of both caps:


It already had no C67 which I've seen often but this particular MB revision I've not seen before and I haven't seen it online on a quick google search either.

 

Ok got more photo's of this pcb
i know black screen can be ppu or cpu or even wram

 

Mmmmm not much to be done with this Snes theb as I'm in a store... Any clue as to why these caps dont retain current?

 

What do you mean by retain current? When you turn off the console?

If so, the console will drain the caps. The only cap that retains power when its switched off is the main cap on the input. But even that is discharged if you switch the console on without the power lead.

 

Well normally to test if caps are good I inject current in them with my tester and then read if it's got a small charge .(which'll decrease rapidly)

The two I removed don't. But they do once they're off the main board.

Testing them powering on and off the console while playing arround in the console with metal probes, one false move and it could be game over.

 

You cant really test caps on board - results will vary greatly depending on the circuit.

The power you are injecting is getting used by the rest of the circuit. For example, you will be able to test the input cap no problem with your method, if the switch is off.

The fact they work off board should immediately tell you its nothing to do with the caps.

 

Yeah I had figured as much, which is why I suspected the CPU or PPU. I guess I'll use this Snes for spare parts.

thanks for the input guys!