gigabyte nh50hpbm charges battery but doesn't power up

[kjchatman]

the sio has a slight glow to it under the thermal camera. pwr_btn stays high at 3.3v after pressing the power button. PCH_DPWROK doesn't go higher than 1.0v. ec_rsmrst stays at 0v

[mon2]

To save time, always link the schematic.

The 'NH50HP' schematics are posted in the schematics forum.

Locate and short the power button signal line to ground to emulate the power button.

[kjchatman]

pwr_btn stays high at 3.3v after pressing the power button. ec_rsmrst stays at 0v after pressing the power button

[mon2]

pwr_btn stays high at 3.3v after pressing the power button.

The power button is an active low signal. By default, the parked voltage on this line should be 3v3 when the power button is OPEN.

When you press the button, the button should pull this line to 0v since the other side of the power button is mated to ground. Confirm it. After the button is released, the pull-up resistor will park the line once again to a value of 3v3.

If you do not see this action, confirm the wiring to the power button line. As requested, use tweezers to short the pins on the connector block itself. See above and post back the test results.

[kjchatman]

i don't see b3j_sw1 on this board

[kjchatman]

pwr_btn goes to ground and then back to 3.3v

[kjchatman]

just flashed the bios and the EC and still no joy. Gave the board an ultrasonic bath also

[mcplslg123]

Mb not triggering at all can be for many reasons.

Check RTC circuit/basic requirement of SIO like whether its powered or not,EC_RST#/LIDSW# etc.

What's the resistance to GND on RSMRST#? Should be 10K or higher.

[kjchatman]

i think vcc_rtc is supposed to be 3.3v but it's 4.9 ohms to ground

[mon2]

Try the following. Carefully flux and remove:

R418 ; 0 ohm resistor - then test the resistance to ground again

If still shorted, continue..

C655 ; remove and test resistance to ground again

R294 ; remove and test resistance to ground again

Post your updates. Do not power up with out these parts. We are only hunting for the shorted component on this rail.

[kjchatman]

i injected voltage before reading the last post. The resistance to ground instantly went back to normal and the computer is back in business. i had to put that the orignal bios and EC programming because it wasn't posting or detecting the battery

[mon2]

The injection process caused the shorted part to cry uncle and died. Probably was a shorted bad cap.

Hey! Good name for a website?

Respectively removing itself from the shorted rail. Either way, glad that it is fixed.

[mcplslg123]

Sticking to basics solves more then 90% of repair cases as long as one has patience.