I currently own the SOYO SY-P4I875P Dragon 2 v1.0 Black Label motherboard, which has been working since 2004, until recently. The system began to power off by itself. I suspected the 400 watt PSU and purchased a new PSU i.e. ULTRA 600 watt PSU. I connected the new PSU and after a couple of power cycles I heard a pop and a burned smell in the PC case.
I looked at the motherboard and the 2200uf capacitor appeared to be bad. All the capacitors were SACON.
I replaced the following SACON with Rubycon capacitors.
7 - 2200uF 6.3v
7 - 1500uF 16v
15 - 1000uF 10v
7 - 470uF 16v
After checking my solder joints I powered up the system, with CPU, memory, video card, keyboard/mouse. After resetting the CMOS, I successfully was able to get into the BIOS.
I was monitored the PC Health Status, and the voltages appeared to be OK.
After sometime, the screen goes blank but all the fans are running. I checked the BIOS setting to make sure it was not going into “sleep” mode. So the motherboard is POSTing, but eventually shuts down with all the fans still running. I decided to remove and resolder the 2200uF and 1500uF capacitors in case I had some bad solder joints. The mother still is POSTing and I'm able to get into the BIOS, but the motherboard shuts down with all fans still running.
After spending time on this, I noticed that Q14 – NTD80N02 and Q13 – NTD60N02R (ON Semiconductor) are HOT, and U17 and U15 – HIP6602B (Intersil) are also HOT.
Is it possible that both MOSFETs are no good, resulting in the instability I am observing? Should I replace the MOSFETs? Anybody else encore a similar problem after recapping?
I appreciate any help and guidance you can provide.
I looked at the motherboard and the 2200uf capacitor appeared to be bad. All the capacitors were SACON.
I replaced the following SACON with Rubycon capacitors.
7 - 2200uF 6.3v
7 - 1500uF 16v
15 - 1000uF 10v
7 - 470uF 16v
After checking my solder joints I powered up the system, with CPU, memory, video card, keyboard/mouse. After resetting the CMOS, I successfully was able to get into the BIOS.
I was monitored the PC Health Status, and the voltages appeared to be OK.
After sometime, the screen goes blank but all the fans are running. I checked the BIOS setting to make sure it was not going into “sleep” mode. So the motherboard is POSTing, but eventually shuts down with all the fans still running. I decided to remove and resolder the 2200uF and 1500uF capacitors in case I had some bad solder joints. The mother still is POSTing and I'm able to get into the BIOS, but the motherboard shuts down with all fans still running.
After spending time on this, I noticed that Q14 – NTD80N02 and Q13 – NTD60N02R (ON Semiconductor) are HOT, and U17 and U15 – HIP6602B (Intersil) are also HOT.
Is it possible that both MOSFETs are no good, resulting in the instability I am observing? Should I replace the MOSFETs? Anybody else encore a similar problem after recapping?
I appreciate any help and guidance you can provide.
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