• Asus F500 motherboard X550CC Rev. 2.0 dead.

It is currently 16 July 2025, 22:13

Asus F500 motherboard X550CC Rev. 2.0 dead.

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 This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).

#1 Asus F500 motherboard X550CC Rev. 2.0 dead.

by valieromarco • 16 November 2017, 15:26
Motherboard was dead. After replacing shorted component components showed motherboard starts but no video, because missing voltage on coil PJ8001.

Mosfet 4955N has been replaced by 4921N, I think is compatible.

Image

Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by Google Adsense [BOT] • 16 November 2017, 15:26

#2 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by matic • 16 November 2017, 20:41
Hello!

Measure resistances between pins 43 and 44, and between pins 44 and 45 of RT8885A.
Measure resistance to ground on the coil, on which the voltage is missing.

#3 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by valieromarco • 16 November 2017, 21:21
Between 43-44= 850k ohm
44-45= 10k ohm

Coil = 4 ohm

#4 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by matic • 16 November 2017, 21:30
Reflash BIOS chip. If it does not solve the issue reflash KBC chip.

#5 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by valieromarco • 16 November 2017, 22:13
Main bios has been reflashed, KBC there is not chip to flash

#6 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by matic • 16 November 2017, 23:05
valieromarco wrote:KBC there is not chip to flash
Oops, my fault.

Try to reflow PCH chip.

#7 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by valieromarco • 17 November 2017, 01:08
I made a mistake to check all voltages.
Next picture show the right measures


Image

I check bios chip voltages and aren't normal.

Motherboard starts when power jack is plugged in without pressing power button

Image

#8 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by Type5 • 17 November 2017, 03:28
If it was shorted PQ8001 (high mosfet), it could be a lot of damaged parts:
PU8000 (RT8885AZQW),
PCE8000, PCE8001, PCE8002, PCE8003, PCE8005 - if present,
also PC8070, PC8071.....PC8079 - if present,
possible CPU damage.
Here boardview:
post152759.html?hilit=asus%20x550cc%20schemat#p152759
Voltage bios chip is too high, the same should be on KBC chip (+3VA_EC).

#9 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by valieromarco • 20 November 2017, 11:45
maybe CPU damaged

#10 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by matic • 20 November 2017, 20:36
valieromarco wrote:maybe CPU damaged
You can't know it for now.

Measure voltage to ground on pin 8 of BIOS chip again. If it still shows 4.9V replace the battery in multimeter or use another multimeter.

#11 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by valieromarco • 22 November 2017, 00:34
wrong measure was caused by power button, disconnecting flat of power button, measure are ok 3,3V.

Motherboard turns on itself when plugging power supply, led turn on as shows the picture.

CPU becomes hot but missing voltages on coil PJ8001 and PJ8008.
GPU becomes hot.

#12 Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by Type5 • 22 November 2017, 00:52
Replace PU8000 (RT8885AZQW) and PCE8000, PCE8001, PCE8003 (560μF/2,5V).

Re: Asus F500 motherboard X550CC Rev. 2.0 dead.

by Google Adsense [BOT] • 22 November 2017, 00:52
 This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).
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