VA6 Genesis wrong power polarity repair.

[junkyardw]

I received a lot of non-working genesis yesterday. Two of them were easy fixes but one appears to have had the wrong kind of power supply plugged into it. One voltage regulator was bad, a couple of caps were blown, and one of the surface mount components on the bottom was burned off. I replaced both 7805 regulators, but im not sure what the component on the bottom actually is, it is labled C2, which makes me think its a capacitor. It is located right next to the voltage regulator pins, but has no numbers on it. Can anybody tell me what it is? And if that is a capacitor can i replace it with an electrolytic kind? I will include some pictures.

Thanks

776577647766

[Bratwurst]

http://console5.com/wiki/Genesis#IC_BD_M5_USA_VA6

Doesn't look like C2 is listed as a cap.

[junkyardw]

Yeah I checked that list. I think that is just the thru hole caps on the top of the board right? The ones that are normally replaced from a cap kit. The component that blew up was on the bottom of the board and it was surface mount. Each voltage regulator seems to have one of these components on the voltage input/output pins, equaling 4 in total.

[RP2A03]

Best I can tell it is a ceramic capacitor and should be replaced by another ceramic cap. Unfortunately, the only way to know its capacitance is to measure it.

[Bratwurst]

Ah I see what you're trying to ID. It's likely all four of those mystery ceramics are the same, they'd be easy to remove with soldering iron tweezers to measure. If the remaining three are identical... it's also not a good idea to replace a ceramic with an electrolytic.

[FABombjoy]

Probably a .1uF. Typical to see about that before and after the regulator. A 7805 datasheet should have recommended values.