ASUS P4S800D-X - Won't POST, gives beep codes - Help needed
Hi.
I recently got my hands on a box full of old computer parts, consisting mainly in video cards, motherboards and some CPUs.
Inside the box was another box with this P4S800D-X mobo, completely full with their manual, CDs, backplate, etc. The board looks like used, but, apart from the dust, it seems like it is perfectly fine. No broken traces, no bulging capacitors, no burned components, no PCB burned signs... It's a P4 mobo using DDR ram slots, and using a SiS 655FX chipset. It also support dual-channel, SATA drives and is Prescott ready.
But there is a problem with it, and I can't seem to make it work.
First, the board doesn't want to power up from the power up pins. It just won't power up from there. To power it up, I have to short the PS_ON pin on the PSU to ground, then it powers up. I don't need to keep those pins shorted for the mobo to work, I just need to short them once and quickly, and it just powers up. Once it power up, the power up pins seem to work for powering it down, meaning, if I short them for more than 4 seconds, the board shuts down.
After that, no matter if I put memory in it or not, the board always gives me the same beep code error: 1 long, 2 short beeps, once they end, they start repeating over and over. It doesn't give the beeps instantly, it starts beeping after aproximately 30 seconds of beign powered up. It does that with all the available DDR memory modules I have, ranging from 128MB to 512MB.
According to ASUS customer support, it's a MEMORY (not video card) error. Even with a video card plugged in in either the AGP or PCI slots, it just keeps giving me the same beep code. The northbridge and the southbridge gets a little warm (the SB a little more than the NB, probably because the NB has a heatsink), the CPU heatink/cooler gets a little warm too.
The past of the board is unknown, the only thing I know is it was removed because sometimes it booted (POST), sometimes not... until it won't booted anymore.
I'm using a P4 1.8A Northwood for testing it. The CPU seems to be receiving the correct voltage: 1.55v, checked with a multimeter. VRM out caps are OST RLZ series, 1500uf x 6.3v, 7 of them. VRM in are Chemicon KZE, 1200uf x 16v, 4 of them. The rest of the "big" capacitors used in the mobo are OST RLS series, 1000uf x 6.3v, there are 15 of them scattered through the board.
Having in mind that according to ASUS it's a memory error, I checked the VDD pins on the memory slots with my multimeter. It read 2.10V in everyone of the slots... could the problem really be memory related and could it be the slots are not receiving enough voltage to power up the memory ?
Any more ideas as to what to check or suggestions as how to fix the memory voltage issue ? I just want to try fix it for the fun of it (if it's possible), and maybe in the end I can end up with a working mobo that I can use for some project.
I attached some pics of the board. I'll try to take better ones if needed.
Thanks for any reply.
Have a nice day.
I recently got my hands on a box full of old computer parts, consisting mainly in video cards, motherboards and some CPUs.
Inside the box was another box with this P4S800D-X mobo, completely full with their manual, CDs, backplate, etc. The board looks like used, but, apart from the dust, it seems like it is perfectly fine. No broken traces, no bulging capacitors, no burned components, no PCB burned signs... It's a P4 mobo using DDR ram slots, and using a SiS 655FX chipset. It also support dual-channel, SATA drives and is Prescott ready.
But there is a problem with it, and I can't seem to make it work.
First, the board doesn't want to power up from the power up pins. It just won't power up from there. To power it up, I have to short the PS_ON pin on the PSU to ground, then it powers up. I don't need to keep those pins shorted for the mobo to work, I just need to short them once and quickly, and it just powers up. Once it power up, the power up pins seem to work for powering it down, meaning, if I short them for more than 4 seconds, the board shuts down.
After that, no matter if I put memory in it or not, the board always gives me the same beep code error: 1 long, 2 short beeps, once they end, they start repeating over and over. It doesn't give the beeps instantly, it starts beeping after aproximately 30 seconds of beign powered up. It does that with all the available DDR memory modules I have, ranging from 128MB to 512MB.
According to ASUS customer support, it's a MEMORY (not video card) error. Even with a video card plugged in in either the AGP or PCI slots, it just keeps giving me the same beep code. The northbridge and the southbridge gets a little warm (the SB a little more than the NB, probably because the NB has a heatsink), the CPU heatink/cooler gets a little warm too.
The past of the board is unknown, the only thing I know is it was removed because sometimes it booted (POST), sometimes not... until it won't booted anymore.
I'm using a P4 1.8A Northwood for testing it. The CPU seems to be receiving the correct voltage: 1.55v, checked with a multimeter. VRM out caps are OST RLZ series, 1500uf x 6.3v, 7 of them. VRM in are Chemicon KZE, 1200uf x 16v, 4 of them. The rest of the "big" capacitors used in the mobo are OST RLS series, 1000uf x 6.3v, there are 15 of them scattered through the board.
Having in mind that according to ASUS it's a memory error, I checked the VDD pins on the memory slots with my multimeter. It read 2.10V in everyone of the slots... could the problem really be memory related and could it be the slots are not receiving enough voltage to power up the memory ?
Any more ideas as to what to check or suggestions as how to fix the memory voltage issue ? I just want to try fix it for the fun of it (if it's possible), and maybe in the end I can end up with a working mobo that I can use for some project.
I attached some pics of the board. I'll try to take better ones if needed.
Thanks for any reply.
Have a nice day.
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