Asus P4S533-E Dead Unit

[CompNeigh]

Hi guys need help here. Im repairing a dead unit from Asus, with model number P4S533-E. The BIOS is good I tested it with another working unit. No bloated Caps too. Visible non SMD Diodes are all ok. any suggestions?

[Brian C]

Re: Asus P4S533-E Dead Unit

Check the CMOS battery voltage... Certain ASUS mobos cannot power on if the battery is flat.

[CompNeigh]

Re: Asus P4S533-E Dead Unit

Nope. The battery is ok sir. Im testing them using a DVOM and LED's.

[zandrax]

Re: Asus P4S533-E Dead Unit

Nope. The battery is ok sir. Im testing them using a DVOM and LED's.

Try removing the battery for a few minutes: it should clear the cmos. Sometimes bad cmos settings prevent the bios from booting, I don't know why.

Zandrax

[CompNeigh]

Re: Asus P4S533-E Dead Unit

Try removing the battery for a few minutes: it should clear the cmos. Sometimes bad cmos settings prevent the bios from booting, I don't know why.

Zandrax

I tried that sir. As I have said I tried the BIOS on another working board (Swapping) and it works fine. So the BIOS is out here. Im thinking of the Southbridge. I'm checking the PWR SW jumper now.

[zandrax]

Re: Asus P4S533-E Dead Unit

I tried that sir. As I have said I tried the BIOS on another working board (Swapping) and it works fine. So the BIOS is out here. Im thinking of the Southbridge. I'm checking the PWR SW jumper now.

Beware: the Power switch is not a jumper, is really a switch. A jumper will overheat, melting itself and [most of time] damaging the whole board, so never put a jumper on. You can power on the mainboard by closing the switch pins with a screwdriver for a couple of seconds.

Excluding both bios and cmos settings, next troubleshooting steps are motherboard's integrity, power supply's quality and ram sticks:
- motherboard: does the led light when you connect the psu to mains? Are fans spinning when you try powering on the motherboard? If not, you are facing a lack of power good signal, due to an unreliable/faulty psu or to a motherboard damage (maybe the hardware monitor chip is broken);
- psu: write brand and model, because often an unreliable psu creates or exacerbates such problems;
- ram: low-end Asus boards are known to be quite picky about ram. Use only a stick and, if possible, try other ones.

Zandrax

[kc8adu]

Re: Asus P4S533-E Dead Unit

Beware: the Power switch is not a jumper, is really a switch. A jumper will overheat, melting itself and [most of time] damaging the whole board, so never put a jumper on. You can power on the mainboard by closing the switch pins with a screwdriver for a couple of seconds.

Excluding both bios and cmos settings, next troubleshooting steps are motherboard's integrity, power supply's quality and ram sticks:
- motherboard: does the led light when you connect the psu to mains? Are fans spinning when you try powering on the motherboard? If not, you are facing a lack of power good signal, due to an unreliable/faulty psu or to a motherboard damage (maybe the hardware monitor chip is broken);
- psu: write brand and model, because often an unreliable psu creates or exacerbates such problems;
- ram: low-end Asus boards are known to be quite picky about ram. Use only a stick and, if possible, try other ones.

Zandrax

i have never seen a case where putting a jumper on the powerbutton pin would melt anything.
worst case is it won even turn on.
most likely it will turn on,run 5 sec and turn off.
do you have a good dvm?
time to verify psu voltages,pg,vcore,vdimm,ect.
lots of things make a board not post.
common on asus are elite brand caps on vcore which fail without visible signs.
an 80h card may be of some help here too.

[zandrax]

Re: Asus P4S533-E Dead Unit

i have never seen a case where putting a jumper on the powerbutton pin would melt anything.
worst case is it won even turn on.
most likely it will turn on,run 5 sec and turn off.

You are right: fan connectors are to ones not to be jumpered.
I apologize for my mistake: I confused with them because of my memory.
I did put a jumper on the power pins when I tested an atx motherboard for firts time: the motherboard switched on and went off after about 5 seconds. I suddently remembered the 4 seconds forced shutdown, blamed myself for having done such a silliness and detached the psu from mains: the jumper I removed was quite hot, with a slight smell of burnt plastic. While it didn't melt, I feared it could have done: since then, I use only an insulated screwdriver.

Zandrax

[CompNeigh]

Re: Asus P4S533-E Dead Unit

Even though Im a newbie on this site it does not mean I am a newbie on repairs. ^_^

well anyway even before you posted your comments and suggestions I already did those. In fact those steps are sooo for starters. I did not use a jumper on the PWR SW I was refering to the connector of the PWR SW from the board side. this usually have 3V+. Yes I am using multiple VOM's Digital and analog. I have found the trouble. its a 3 legged IC near the front panel section. Its an SMD goshhh! If I'd replace this one I'd hope the board will be alright. If not I will assume its the South bridge that is defective.

[stng]

Re: Asus P4S533-E Dead Unit

It may not be the south bridge...The super IO chip could be the culprit sometimes..coz fail to communicate with the bios chip ...i fixed few boards before..