+-^CrossBow^- Posted May 12, 2019 Share Posted May 12, 2019 More info on the one I'm working on. So using the service manual, I've verified I have +5 to all main ICs and RAM with a cart inserted and power applied. But still nothing. I swapped out the main ICs with known good ones...still black screen. Swapped the BIOS with a spare I have from a 4-port...black screen. Only thing odd from the service manual flowchart is that when checking for +5 on the main ICs, the Pokey is stated to check for voltage from pin 1 GND, to +5 on pin 17. On this Pokey I'm getting +5 on Pin 16...not 17. Without taking another 2 port unit apart (I've haven't one on hand really) I'm not sure if that is just a misprint in the service manual? Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted May 13, 2019 Share Posted May 13, 2019 Got is resolved. The issue was that somehow when the PSU went out, it took out 5...yes 5 of the vram's with it?! The first 5 in fact from the top down. Only figured it out because I damn near burnt the side of my hand off them when I was taking voltage measurements on other places on the board. They were all getting crazy hot! Yanked them all out and replaced them all from a known good donor. Fired right up without issue at that point. Then I started to replace them out once by one with the originals until I found the culprits. Still trying to figure out what took out the PSU in the first place as it my primary bench testing PSU and the one I use on my personal 5200 ugh... And it is a sealed PSU so I can't open it without cutting. Still client will be happy to get a fully working 2-port unit back with properly calibrated controllers to boot. Quote Link to comment Share on other sites More sharing options...
ataribytes Posted April 26, 2020 Share Posted April 26, 2020 Just got a "working" 5200 with power supply and switchbox and 2 controllers off Ebay. Powers on only some of the time. When it does, the games do come up, but in black and white. I can't get past the title screens, though, because the "working" controllers...don't. One of them is actually missing the "reset" button. Despite having never done this before, I have ordered parts to attempt to refurbish the controllers. My bigger concern is the console. I have no electrical expertise, but how can I tell if it's the switchbox or power supply or both (or neither) that's bad, without spending the money on parts I don't need? Quote Link to comment Share on other sites More sharing options...
+-^CrossBow^- Posted April 27, 2020 Share Posted April 27, 2020 If the console powers on at all, then the switch box and power supply are likely okay. A black n white picture could simply be that either the RF modulator on the 5200 needs some adjustment. You didn't specify what kind of TV you are using, but if you are using a more modern flatpanel, then what you might want to do, is to power up the 5200 with a game in it, giving you the black n white screen. Then go into your TVs settings specifically the area for the channels and select for it to search for channels. Leaving the 5200 on will help the TV to see it and lock in or tune it as an actual channel you can select. If it is a CRT then it points back to the RF modulator likely needing to be adjusted. What games do you have? Quote Link to comment Share on other sites More sharing options...
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