James Scriver Posted September 27, 2017 Report Share Posted September 27, 2017 I've got a 1.6 with good traces that won't power on. If I hold the power button in I can hear the HDD spinning but nothing else happens, no video output, the led's don't light up, nothing.. Before I go about ordering the replacement transistor for the mb, I'd like to test the psu to make sure it's working, and I don't have any other 1.6's around to try it out in. I've been looking around online for 45 mins and can't find anything specific to testing the psu for correct voltage (it's a Delta if that matters, and everything looks flawless on it, no obvious problems.) If anyone can help me out with this, or has another idea of what may be the problem, I'd appreciate it immensely (and yes I have a multimeter handy :P) Cheers, Jim Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 I lied. Found a 1.6 with a working PSU, swapped it over, exact same thing. Guess it's time to order that transistor. 1 Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 (edited) Sounds like the transistor's your best option to fix it. I think it signals the PSU to turn on and without the collector held at 3.26 to 3.3Vdc the PSU won't come on. If you have a multimeter, you could check the voltage level at the transistor's collector (RED multimeter lead) with respect to GND (BLACK multimeter lead to case shield or one of the screws that hold the motherboard in place.). See page 84 of the XBOX REPAIR GUIDE for more information and Floydzabarber's youtube video - Original Xbox version 1.6 won't power on fix . Edited September 27, 2017 by KaosEngineer 1 Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 (edited) Thanks for the help Kaos I appreciate it. I tried that out and the collector resistor held steady at 3.27, so I'm guessing that's not it. I also tested the voltages on the PSU against this chart and they all match up, http://diy.sickmods.net/Tutorials/Xbox1/Power_Supply_Pinouts/ The voltages for the "powered on" reading would match for about 1-2 seconds after pressing the power button then rapidly fall to 0, any ideas on that? I'm lost. Edited September 27, 2017 by James Scriver Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 (edited) Power supply voltage levels at the motherboard connector for various Xbox versions: Source: http://diy.sickmods.net/Tutorials/Xbox1/Power_Supply_Pinouts/ Edited September 27, 2017 by KaosEngineer Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 (edited) 9 minutes ago, James Scriver said: Thanks for the help Kaos I appreciate it. I tried that out and the collector resistor held steady at 3.27, so I'm guessing that's not it. I also tested the voltages on the PSU against this chart and they all match up, http://diy.sickmods.net/Tutorials/Xbox1/Power_Supply_Pinouts/ The voltages for the "powered on" reading would match for about 1-2 seconds after pressing the power button then rapidly fall to 0, any ideas on that? I'm lost. Does the collector of the transistor stay at the 3.27V or does it drop after 1-2 seconds? I've not had to test a v1.6 with a power on problem. Providing info that I've read on the subject. Edited September 27, 2017 by KaosEngineer Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 It stays constant for at least 10 seconds, that's all I tested. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 From the diy.sickmods.net page we've both been reading: Quote As you can see in the diagrams the PowON and PowOK signals are not to be used as current sources; they are just signals between the PSU and the mobo. PowON is a signal from the mobo to the psu telling it to turn on, so when the xbox notices that you have pressed the power button on the front it puts 3.3V on the PowON line to tell the PSU to turn on. When the PSU is stable it ouputs 3.3V on the PowOK line to tell the mobo that the psu is working correctly and that the whole xbox can be turned on. Check the PowOK and PowON levels. PowON 3.3V then PowOK should go to 3.3V too. Both should hold that level until the power button is pressed to turn off the Xbox and the voltage on PowON should go to 0V and shutdown the Xbox thus PowOK should go to 0V too. Which doesn't match up with what's shown. PowOK for v1.6 shows in sickmods.net's Delta1.6 figure same 3.3 either state. Don't think that's correct but haven't checked a v1.6 and need to find my multimeter too before I can tet things. Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 Ahhh, I don't know how I missed this before... it was under a wire but still.. I looked at the board for a good 5 minutes. Could this be the culprit? Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 2 minutes ago, KaosEngineer said: From the diy.sickmods.net page we've both been reading: Check the PowOK and PowON levels. PowON 3.3V then PowOK should go to 3.3V too. Both should hold that level until the power button is pressed to turn off the Xbox and the voltage on PowON should go to 0V and shutdown the Xbox thus PowOK should go to 0V too. Yup, they do. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 (edited) YES, bad cap can cause the problem. To be on the safe side, I'd replace all 4 of those same value caps. I think there are 4 that have the same value near the motherboard power connector. Capacitor source: https://www.badcaps.net/index.php Edited September 27, 2017 by KaosEngineer Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 Good call, most of the ones I'm seeing to order comes in packs of 4-10 anyway. Thanks for walking through the troubleshooting with me! Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 Your welcome. Post back what the results are after replacing the capacitor. Have you tried your Xbox's power supply in the other v1.6 Xbox? Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 27, 2017 Author Report Share Posted September 27, 2017 I did not, but I'll do that today. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted September 27, 2017 Report Share Posted September 27, 2017 (edited) There are a couple threads at badcaps.net about 1.6 Xbox's with power on problems: https://www.badcaps.net/forum/showthread.php?t=61727 https://www.badcaps.net/forum/showthread.php?t=60295 https://www.badcaps.net/forum/showthread.php?t=51725 https://www.badcaps.net/forum/showthread.php?t=48951 I see there are 5 of those larger caps not just 4. from pics in the third thread above. A suggestion from all those threads mentions using low ESR caps to replace them. Have to piece statements from across all the posts in these threads to hopefully come up with a solution. Edited September 27, 2017 by KaosEngineer Quote Link to comment Share on other sites More sharing options...
James Scriver Posted September 28, 2017 Author Report Share Posted September 28, 2017 Thanks again, I appreciate it, And the PSU did work in another 1.6 btw. Quote Link to comment Share on other sites More sharing options...
James Scriver Posted October 17, 2017 Author Report Share Posted October 17, 2017 Well I replaced all the caps of that type with exactly the same ones, and when I plugged it in, 3 of them immediately burst and sprayed electrolytic fluid all over the place lol. That board is now in the electronics scrap bin. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted October 17, 2017 Report Share Posted October 17, 2017 (edited) You sure you placed them in correctly. They are polarity sensitive. The positive (+) terminal, not labeled on the cap goes on the side with the + printed outside the silk-screened circle and the negative lead has the widestrip down the side with a '-' minus symbol printed in it a couple times. This lead should line up the wide white band of the silk-screened placement circle on the printed circuit board. Electrolytic caps (negative symbol in gold band on side): Xbox MB Silk-screened cap placement (notice polarity markings as described above): If installed backwards, they will blowup. Pop! Speewww! Pzzzt! As I think you've now found out. I usually mention that fact when telling people to replace electrolytic caps but see I did not here. Can you post a picture of the Xbox Motherboard showing the blown caps? Edited October 17, 2017 by KaosEngineer Quote Link to comment Share on other sites More sharing options...
James Scriver Posted October 19, 2017 Author Report Share Posted October 19, 2017 Ahh sorry man, it's already gone. I did place them the same way they came out, although I didn't actually check the polarity markings, just went by the paintjob, and assumed it would be the same lol. Apparently it was not.. I'll know for next time. Quote Link to comment Share on other sites More sharing options...
monblondero Posted February 5, 2019 Report Share Posted February 5, 2019 (edited) Hello, my xbox 1.6 crystal not signal in tv. What can you do ? cable ok, psu ok. capacitors ? Edited February 5, 2019 by monblondero Quote Link to comment Share on other sites More sharing options...
Kattmandu Posted February 18 Report Share Posted February 18 On 9/27/2017 at 2:26 AM, KaosEngineer said: Sounds like the transistor's your best option to fix it. I think it signals the PSU to turn on and without the collector held at 3.26 to 3.3Vdc the PSU won't come on. If you have a multimeter, you could check the voltage level at the transistor's collector (RED multimeter lead) with respect to GND (BLACK multimeter lead to case shield or one of the screws that hold the motherboard in place.). See page 84 of the XBOX REPAIR GUIDE for more information and Floydzabarber's youtube video - Original Xbox version 1.6 won't power on fix . Test with the console plugged in or unplugged? Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted February 19 Report Share Posted February 19 8 hours ago, Kattmandu said: Test with the console plugged in or unplugged? Plugged in. Be careful not to touch any exposed metal parts on the PSU. Quote Link to comment Share on other sites More sharing options...
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