mroach Posted August 10, 2023 Report Share Posted August 10, 2023 (edited) Hello! I've found a lot of good info and clever people on this board, so I'm hoping someone can help me out. It started with my old v1.1 Xbox and I screwed up the flash on the Xecuter 2.3b Lite and had no way to recover, so I bought an OpenXenium. I installed the pin header and mod chip and it worked great, for about a minute or two. Then the Xbox crashed. When I powered it back on, it FRAG'd. Disconnecting the mod chip didn't boot back into the stock BIOS either. I found a guy selling a mint v1.1 Xbox nearby for cheap so I bought it. I yanked the clock cap, installed the mod chip, and it booted up and worked great...for about a minute. It crashed and FRAG'd on reboot. Disconnecting D0 and removing the chip wouldn't boot the stock BIOS. Sounds familiar... After leaving the Xbox to sit for a few days while I ordered a magnifying lamp and some nicer wire, I soldered on a new D0 connection and just put the chip in with nothing else (no video even) and switched it on. Green light! Great! Installed the DVD drive and SSD and then...FRAG. I'm pretty confused now. I followed this guide to check the contact points on the board and I traced their resistance, all are less than 0.1 ohms (except the grounding pins...I don't know why those are mapped to vias?). https://www.ogxbox.com/forums/uploads/monthly_2021_01/68206083_xboxLPC.thumb.png.331244095aee4bc57088b5b4ce2ec6c7.png With the system powered on, I checked the voltage and all looks good except the Pin 5 RST voltage is sometimes really low. That seems significant. I have another Xbox on the way but at this point I'm starting to think the mod chip is broken and murdering Xboxes. Since they won't boot even with the chip disconnected, that makes me think the chips borked the EEPROM or caused some electrical damage. I also find it weird that after letting the Xbox sit for a couple days and really not doing much, it worked once and then not again. I'm wondering if there's some kind of breaker being tripped and that resets? I know the Nintendo 64 has something like that if you had inserted the memory expansion pack backwards, you'd have to wait an hour or something. I've visually scanned the motherboard looking for bad traces, solder splash, anything looking out of the ordinary and it all looks fine. I'm at a loss at this point. What else can I check? What am I missing? Big thanks for any help anyone can provide Edited August 10, 2023 by mroach Added pics Quote Link to comment Share on other sites More sharing options...
Marty Posted August 10, 2023 Report Share Posted August 10, 2023 If your chip is frying the MCPX, there's no coming back from that. Quote Link to comment Share on other sites More sharing options...
Bowlsnapper Posted August 10, 2023 Report Share Posted August 10, 2023 4 hours ago, Marty said: If your chip is frying the MCPX, there's no coming back from that. True, but it really shouldn't be if it's hooked up correctly... AND a brand new chip. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted August 11, 2023 Report Share Posted August 11, 2023 9 hours ago, mroach said: Hello! I've found a lot of good info and clever people on this board, so I'm hoping someone can help me out. It started with my old v1.1 Xbox and I screwed up the flash on the Xecuter 2.3b Lite and had no way to recover, so I bought an OpenXenium. I installed the pin header and mod chip and it worked great, for about a minute or two. Then the Xbox crashed. When I powered it back on, it FRAG'd. Disconnecting the mod chip didn't boot back into the stock BIOS either. I found a guy selling a mint v1.1 Xbox nearby for cheap so I bought it. I yanked the clock cap, installed the mod chip, and it booted up and worked great...for about a minute. It crashed and FRAG'd on reboot. Disconnecting D0 and removing the chip wouldn't boot the stock BIOS. Sounds familiar... After leaving the Xbox to sit for a few days while I ordered a magnifying lamp and some nicer wire, I soldered on a new D0 connection and just put the chip in with nothing else (no video even) and switched it on. Green light! Great! Installed the DVD drive and SSD and then...FRAG. I'm pretty confused now. I followed this guide to check the contact points on the board and I traced their resistance, all are less than 0.1 ohms (except the grounding pins...I don't know why those are mapped to vias?). https://www.ogxbox.com/forums/uploads/monthly_2021_01/68206083_xboxLPC.thumb.png.331244095aee4bc57088b5b4ce2ec6c7.png With the system powered on, I checked the voltage and all looks good except the Pin 5 RST voltage is sometimes really low. That seems significant. I have another Xbox on the way but at this point I'm starting to think the mod chip is broken and murdering Xboxes. Since they won't boot even with the chip disconnected, that makes me think the chips borked the EEPROM or caused some electrical damage. I also find it weird that after letting the Xbox sit for a couple days and really not doing much, it worked once and then not again. I'm wondering if there's some kind of breaker being tripped and that resets? I know the Nintendo 64 has something like that if you had inserted the memory expansion pack backwards, you'd have to wait an hour or something. I've visually scanned the motherboard looking for bad traces, solder splash, anything looking out of the ordinary and it all looks fine. I'm at a loss at this point. What else can I check? What am I missing? Big thanks for any help anyone can provide All of those solder joints on the LPC Debug pin header look like cold solder joints and some are not even making a connection to the pad on the motherboard. Reflow them all. See: Common Soldering Problems | Adafruit Guide To Excellent Soldering | Adafruit Learning System 1 Quote Link to comment Share on other sites More sharing options...
Bowlsnapper Posted August 14, 2023 Report Share Posted August 14, 2023 On 8/10/2023 at 8:35 PM, KaosEngineer said: All of those solder joints on the LPC Debug pin header look like cold solder joints and some are not even making a connection to the pad on the motherboard. Reflow them all. See: Common Soldering Problems | Adafruit Guide To Excellent Soldering | Adafruit Learning System Confirmed. Quote Link to comment Share on other sites More sharing options...
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