jrme421 Posted February 13, 2022 Report Share Posted February 13, 2022 aftr replacing the clock capacitor the xbox wont turn on with the power button, it was turning on before i cleaned the board with isopropol alcohol and check the conitnuity of the capacitors but everything seems to work, on a sidenote i replaced a few more capacitors that were included in the pack i bought on ebay but put back the originals after the xbox wont turn on, the only capacitor i kept replaced is the clock one, but i tried to turn on the xbox without the clock capacitor with the same problem i just dont know where to look. https://ibb.co/nQncPcthttps://ibb.co/CPzG3Q8https://ibb.co/zNnDMCYhttps://ibb.co/jJ7xBR0https://ibb.co/m5GKSM9https://ibb.co/gFZDKZs also the eject button is reponsive anf gives a green orange light its just power button that is unresponsive i think my board is a 1.2 any ideas? Quote Link to comment Share on other sites More sharing options...
big F Posted February 13, 2022 Report Share Posted February 13, 2022 Check and recheck polarities of the caps. Also why replace the clock cap, they work fine without them, and to be honest are as much use as a chocolate teapot any way. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted February 13, 2022 Report Share Posted February 13, 2022 You have a v1.1 motherboard. 12x1 AT-style Power Supply Unit (PSU) connector (found on v1.0 and v1.1 motherboards) No fan on the GPU heatsink (the heatsink on the right in picture 1) (v1.1-1.6) Conexant Video encoder (v1.0-1.3) No USB daughterboard for controller ports (only v1.0 has a USB daughterboard that plugs vertically onto two connectors on the front edge of the motherboard that the controller port cables connect to. The Xbox uses soft power to turn on. The always powered System Management Controller (SMC) - a PIC processor on your motherboard - at location receives a signal from the front panel. It then turns on/off the rest of the power supply unit voltage supplies. With AC power disconnected, measure for continuity of the power trace to the SMC. See: Power / Eject Troubleshooting If there's no continuity, the trace is damaged and needs to be repaired. With AC power connected, make sure that the PSU's standby (STB) supply measures 3.3Vdc (brown wire). Quote Link to comment Share on other sites More sharing options...
jrme421 Posted February 17, 2022 Author Report Share Posted February 17, 2022 thanks kaosengineer. after tracing from the power pin of the front panel to the pic chip i couldnt get continuity. so i located the absence of continuite on the resistors R3G1 R3G2 R3G3 R3G4 however i checked the ohm and they do go through. also i check the contunity right after the R3G3 resistor to the power pin on the pic chip and it went through. do you think i need to change those 4 resistors? if so which one should i buy and where? also its so weird all i did was changing capacitors on the other side of the board. why would it fry those resistors? thanks a lot. Quote Link to comment Share on other sites More sharing options...
SS_Dave Posted February 17, 2022 Report Share Posted February 17, 2022 Looks like trace damage here in the yellow box Cheers SS Dave Soft modding is like masturbating, It gets the job done but it's nothing like the real thing. Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted February 17, 2022 Report Share Posted February 17, 2022 7 hours ago, jrme421 said: thanks kaosengineer. after tracing from the power pin of the front panel to the pic chip i couldnt get continuity. so i located the absence of continuite on the resistors R3G1 R3G2 R3G3 R3G4 however i checked the ohm and they do go through. You need to check for continuity from the violet colored via after the resistor R3G4 or the left side of that resistor to the violet colored pin on the PIC processor. Edit: I believe the resistance from the front panel connector's power pin to the PIC processor will be 10 KOhms. THe powr pin signal does not directory connect from the front panel connector to the PIC processor. It goes through a resistor network with a pull-up and series 10KOhm resistor. See: http://web.archive.org/web/20150227170644/http://diy.sickmods.net/Tutorials/Xbox1/Power-Eject_Pinouts/ for more details on how the front panel signals for the Power and Eject buttons reach the PIC processor - System Management Controller (SMC). Quote Link to comment Share on other sites More sharing options...
jrme421 Posted February 20, 2022 Author Report Share Posted February 20, 2022 On 2/17/2022 at 5:05 PM, SS_Dave said: Looks like trace damage here in the yellow box Cheers SS Dave Soft modding is like masturbating, It gets the job done but it's nothing like the real thing. i already checked those the trace are working, continuity is fine Quote Link to comment Share on other sites More sharing options...
jrme421 Posted February 20, 2022 Author Report Share Posted February 20, 2022 On 2/17/2022 at 5:05 PM, SS_Dave said: Looks like trace damage here in the yellow box Cheers SS Dave Soft modding is like masturbating, It gets the job done but it's nothing like the real thing. i already checked those the trace are working, continuity is fine Quote Link to comment Share on other sites More sharing options...
jrme421 Posted February 20, 2022 Author Report Share Posted February 20, 2022 ther is continuit between resistor R3G4 and teh pic processor but no conitnuty between the fron tpanel and resistor R3G4 Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted February 20, 2022 Report Share Posted February 20, 2022 10 hours ago, jrme421 said: ther is continuit between resistor R3G4 and teh pic processor but no conitnuty between the fron tpanel and resistor R3G4 Are you measuring for continuity to the front panel connector from the left or right-hand side of resistor R3G4? The circuit is as follows: 10KOhm pull-up resistor +----/\/\/\/\/\/\/\-- 3.3Vdc 10KOhm Signal | resistor | to Pic Processor power signal input pin -----/\/\/\/\/\/\/----+------Power pin on front panel connector R3G4 LHS* RHS* *LHS = left-hand side, RHS = right-hand side If you measure from the LHS of R3G4 to the front panel connector's power signal pin, there is 10 KOhms of resistance, not continuity (0 Ohms). Quote Link to comment Share on other sites More sharing options...
jrme421 Posted February 21, 2022 Author Report Share Posted February 21, 2022 thanks yes there is 10kohm and no conitnuity. so does it mean the problem isnt there? Quote Link to comment Share on other sites More sharing options...
KaosEngineer Posted February 21, 2022 Report Share Posted February 21, 2022 5 hours ago, jrme421 said: thanks yes there is 10kohm and no conitnuity. so does it mean the problem isnt there? In your case, I believe the answer is yes, no problem exists. However, it depends upon what you are trying to measure. To measure the resistance of the trace carrying the conditioned power button signal to the PIC processor, measure from the LHS of R3G4 to pin 18 on the PIC processor (the violet-colored connections in the P/E Continuity Trace image above). To measure the resistance of the short trace carrying the front panel power button signal to R3G4, measure from the RHS of R3G4 to the power button pin of the front panel connector (the red colored connections in the P/E Continuity Trace image above). It's usually the longer trace that gets damaged by leaked clock cap electrolyte or PCB board production contamination on the bottom side of the motherboard (#1), not the short trace on the top of the motherboard (#2). Quote Link to comment Share on other sites More sharing options...
MarkC1970 Posted February 23, 2022 Report Share Posted February 23, 2022 You could always test it with a volt meter, sometimes live testing reveals things a dead test does not. The left hand side of R3G4 will be 3.3v with the Xbox plugged in and when you press the power button this should drop to 0v. If this is the case then the resistor network is working fine. Next check the same is true for pin 18 of the PIC (purple in the pictures). If the signal is correct at pin 18 then the trace is good from R3G4 and you have a fault not related to the power button circuit. 1 Quote Link to comment Share on other sites More sharing options...
MarkC1970 Posted February 23, 2022 Report Share Posted February 23, 2022 Oh and the green orange light when you start the Xbox from the Eject button is most likely because you have no AV lead inserted, the XBOX checks which lead type is inserted at start up. That piece of info was passed to me a few weeks back on here when I was nursing an Xbox back to full health. Quote Link to comment Share on other sites More sharing options...
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