ChrisBushman Posted October 23, 2019 Share Posted October 23, 2019 Hey folks, I recently came into possession of a copy Trayisa that had its CR2032 battery explode inside of the cartridge. After cleaning the board up, I noticed a number of spots where corrosion occurred that ate away at one of the components (labeled as C3). My assumption was that this was a ceramic capacitor of some kind as opposed to a resistor (only because of the naming convention used for the components on the PCB). There are colored stripes on the component, similar to a resistor (Red, Red, Orange, White or Gray if I'm reading the component correctly). My question is "What is this component?". I would like to repair the board. Any and all help would be greatly appreciated. PCB Info: SEGA 1990 171-5955A Quote Link to comment Share on other sites More sharing options...
Keatah Posted October 23, 2019 Share Posted October 23, 2019 Ohh dear, that whole board is contaminated. Look at all the blue vias, they should be green! Quote Link to comment Share on other sites More sharing options...
+Stephen Moss Posted October 24, 2019 Share Posted October 24, 2019 You can look up the colour codes and how to read them online but essentially they are the same as resistor colour code except that instead of starting from 0 you are working in pico farahds (pf). So I believe 2, 2 & 3 zero = 22000pF = 22nF, white/grey will be the tolerance, generally ceramic are 10% Quote Link to comment Share on other sites More sharing options...
ChrisBushman Posted October 24, 2019 Author Share Posted October 24, 2019 Understood. I appreciate the help. Yah, I was a little uncertain if these were actually caps. I will update this topic when my parts come in. I think this cart should clean up real nice. Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted October 24, 2019 Share Posted October 24, 2019 Ugh, but I've recently seen worse. But it was a common that I got it as a shell donor, so LOL. Yeah those are just bypass caps, it could probably work fine without them, but almost anything in the right range is okay. Just take out the bad stuff, try to clean it, and test it out before you put in a new battery. I'm not sure what kind of chemical is best, as I don't know whether a lithium coin battery is acidic or basic, but probably some baking soda water and an old toothbrush, then rinse, towel dry, and let it air dry after that. I think I'm going to try it with my board now. Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted October 24, 2019 Share Posted October 24, 2019 I just tried cleaning the messy board I had with baking soda, it seemed to work okay, but I had already removed all the parts from the board, which made it easier to clean. The capacitors had a "223" and a "336" on them, 336 doesn't make sense (33µf), but 223 would be 22000pf/22nf/.022µf. Your capacitors seem to be red/red/orange, which is also 223. Anything in the range of 0.01 to 0.1 is probably fine, with larger being marginally better. It will probably work without any of them, their purpose is to even out the power supply close to the chips. If you can't get it to work, you could move the ROM to a new board. I have taken apart a lot of carts, and while I didn't find too many 5955A, it is possible that 6278A could work too. (42-pin ROM, 6264/76C88 RAM, 74C00, but I don't have a schematic to confirm) It's also a single-sided board and may be easier to transplant. The best part is you'll find them in lots of junk games. As for the blue vias, I've seen that on boards that are NOT messed up, so it's probably just some solder mask weirdness. As long as the copper hasn't been damaged, and you stabilize the pH, it should be okay. I see where some of the copper on mine got exposed where the solder mask was lost. known 5955A carts: Tecmo Super Hockey Tecmo Super NBA Basketball Shining in the Darkness Phantasy Star III Pirates! Gold known 6278A carts: NHL All-Star Hockey '95 World Series Baseball College Football's Nat. Ch. College Football's Nat. Ch. II NBA Action '94 ATP Tour Championship Tennis Shadowrun NFL Football 94 w/Joe Montana ESPN National Hockey Night Quote Link to comment Share on other sites More sharing options...
ChrisBushman Posted November 6, 2019 Author Share Posted November 6, 2019 (edited) So I now have a functional cart of Traysia. I did get components that were too large for the cart, cleaned the board without removing chips, and removed a minimal amount of corrosion from one of the ICs to just make contact with fresh solder. I also had to bridge a cap with a pin from one of the ICs due to the solder pad being completely corroded away. The goal was to see if the cart and components still work. Mission accomplished. I will be getting more appropriate components and give the board a more detailed cleaning at a later date. I did also neutralize any remaining acid or other chemicals on the cart as well as use a single pass of corrosion cleaner. Results are attached. Edited November 6, 2019 by ChrisBushman Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted November 22, 2019 Share Posted November 22, 2019 LOL at that monstrous mylar capacitor. FYI, little disc ceramics work fine for decoupling caps. Quote Link to comment Share on other sites More sharing options...
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