VOGONS


First post, by PcBytes

User metadata
Rank l33t
Rank
l33t

I just bought this in a pack with a Acorp 6VIA81P (which works) and couldn't for the life of me get it to ever POST.

CPU sometimes gets warm and other times it stays cold. One thing though, regardless if it's warm or cold, it won't POST, and won't BEEP at all. I should add I recapped the board with high quality capacitors (Panasonic and Rubycon)

I even tried without RAM and GPU - no beeps, CPU sometimes gets warm and sometimes stays cold.

I tried all kinds of CPUs:

Cyrix 6x86-P133+GP
Pentium-S 166MHz
AMD K5 PR100
AMD K6-2 350/400/500
Pentium MMX 200MHz

All CPUs were tested on two different systems (Totem TM-586TX4 for the Cyrix, Pentium and AMD K5 and ACorp 5VIA77 (VIA MVP3) for the K6-2s), all POST'd fine.

Any help? I'm at loss as to what I should try. I also used all kinds of GPUs, ranging from an 512KB ISA ATI VGA Charger to a Matrox Millenium 4MB PCI and even a Radeon 9250 128MB AGP, and have checked over 50 times that I set the jumpers correctly for the FSB.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 1 of 19, by Nvm1

User metadata
Rank Member
Rank
Member

Check if you didn't switch the polarity of one of the caps while recapping..
That could explain the symptoms. Next check if all solder point are really good and connect, a broken powerline because a cap doesn't connect also can cause the same.
No other options that I know..

Did the board atleast boot before the recap?

Reply 2 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
Nvm1 wrote:
Check if you didn't switch the polarity of one of the caps while recapping.. That could explain the symptoms. Next check if all […]
Show full quote

Check if you didn't switch the polarity of one of the caps while recapping..
That could explain the symptoms. Next check if all solder point are really good and connect, a broken powerline because a cap doesn't connect also can cause the same.
No other options that I know..

Did the board atleast boot before the recap?

No dice - caps are soldered in the correct orientation (silkscreens are huge on this board) and yes, it did ONCE boot but after the recap. I don't get it because the same caps powered a hungry Pentium D just fine.

Solder points are also fine. I triple checked that during recapping.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 3 of 19, by SSTV2

User metadata
Rank Oldbie
Rank
Oldbie
PcBytes wrote:

CPU sometimes gets warm and other times it stays cold.

First thing you have to do now, is figure out why that happens. CPU VRM is a buck converter and it should not give out randomly, unless some power saving mode kicks in from the system. Try to set CPU core voltage to 3.3V and w/o CPU inserted measure output voltage at the coil/filter caps/CPU socket, look for anything unusual. Also check RAM VRM voltage.

Reply 4 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t

Just measured CPU voltage - 3.23v (with 3.2v setting, board doesn't have exact 3.3v setting) at the cap near the socket.
RAM measures 5.1v on one capacitor (near the corner of the board) and 3.3v on the one next to it.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 5 of 19, by SSTV2

User metadata
Rank Oldbie
Rank
Oldbie

CPU core and RAM voltages are in specs w/o load, check if CPU I/O voltage is 3.3V. Retest CPU core and I/O voltages with a non MMX pentium.

You should also take a look at ICs in QFP packages for bent pins/debris. Reseat BIOS and inspect socket above and beneath, sticking sharp pins beneath BIOS socket might short or puncture solder mask and short with nearby traces.

Reply 6 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
SSTV2 wrote:

CPU core and RAM voltages are in specs w/o load, check if CPU I/O voltage is 3.3V. Retest CPU core and I/O voltages with a non MMX pentium.

You should also take a look at ICs in QFP packages for bent pins/debris. Reseat BIOS and inspect socket above and beneath, sticking sharp pins beneath BIOS socket might short or puncture solder mask and short with nearby traces.

CPU I/O voltage measured 3.2v without CPU, 3.3v with Pentium non-MMX 150MHz.

All ICs are OK, no bent pins or debris whatsoever. Reseated BIOS a lot of times (I have another BIOS chip for it that I got in a pack of ICs).

Any other things to try? I was hoping to do an unusual build with it if I get it to work - P200MMX, 256MB RAM, a Geforce 5600 128MB, Sound Blaster Audigy SE, 80GB HDD and maybe Windows XP. 🤣

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 7 of 19, by SSTV2

User metadata
Rank Oldbie
Rank
Oldbie

Hmm, not sure what else could be checked. If it did POST once, then the chipset and BIOS are OK, probably a bad solder joint/corroded via or CPU socket/cut trace/missing SMDs/shorting semiconductors are causing you grief. I see that this mobo uses QFP northbridge, I'd take a really good look at its pins, try pushing every single one gently with a needle. You can also try pushing/bending board in every direction and while doing that, hit reset several times.

Reply 8 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
SSTV2 wrote:

Hmm, not sure what else could be checked. If it did POST once, then the chipset and BIOS are OK, probably a bad solder joint/corroded via or CPU socket/cut trace/missing SMDs/shorting semiconductors are causing you grief. I see that this mobo uses QFP northbridge, I'd take a really good look at its pins, try pushing every single one gently with a needle. You can also try pushing/bending board in every direction and while doing that, hit reset several times.

I tried slightly bending the board and even pushing the CPU while locked in socket. Nada.

I also inspected the QFP southbridge (the NB is BGA) for bent pins, and all are straight, and make good contact.

Board came in good condition, no corrosion or anything, just a fine layer of dust.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 9 of 19, by SSTV2

User metadata
Rank Oldbie
Rank
Oldbie

Southbridge* my bad, give it a bath then? 😁

Reply 10 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
SSTV2 wrote:

Southbridge* my bad, give it a bath then? 😁

Didn't change anything.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 11 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t

I've been thinking, should I try replacing the buck regulator chip near the CPU? I have another discarded P5MVP3 that has a HIP6008CB chip near the CPU (the one that I'm troubleshooting has something else starting with "A")

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 12 of 19, by Roman555

User metadata
Rank Oldbie
Rank
Oldbie

When CPU is cold it might mean CLK signal is absent and/or RESET signal is active.
Depending on POST card model it may show RESET and CLK signal activity .

[ MS6168/PII-350/YMF754/98SE ]
[ 775i65G/E5500/9800Pro/Vortex2/ME ]

Reply 13 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
Roman555 wrote:

When CPU is cold it might mean CLK signal is absent and/or RESET signal is active.
Depending on POST card model it may show RESET and CLK signal activity .

I don't have a POST card.

CPU seems to heat up very slowly (i.e after half an hour it's barely warm) though.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 14 of 19, by Roman555

User metadata
Rank Oldbie
Rank
Oldbie

You can measure with a voltmeter RESET signal level on pin A15 of any PCI slot. If it has a high level (3.3v) - it's ok.
CLK is on B16 pin, but you can't check it so easy.

[ MS6168/PII-350/YMF754/98SE ]
[ 775i65G/E5500/9800Pro/Vortex2/ME ]

Reply 15 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
Roman555 wrote:

You can measure with a voltmeter RESET signal level on pin A15 of any PCI slot. If it has a high level (3.3v) - it's ok.
CLK is on B16 pin, but you can't check it so easy.

So CLK is absent due to RESET being held? I could look if A15 gives 3.3v.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 16 of 19, by Roman555

User metadata
Rank Oldbie
Rank
Oldbie
PcBytes wrote:
Roman555 wrote:

You can measure with a voltmeter RESET signal level on pin A15 of any PCI slot. If it has a high level (3.3v) - it's ok.
CLK is on B16 pin, but you can't check it so easy.

So CLK is absent due to RESET being held? I could look if A15 gives 3.3v.

Not at all. I didn't mean that. It's rather a southbridge can't deactivate RESET if PLL doesn't supply it with CLK

[ MS6168/PII-350/YMF754/98SE ]
[ 775i65G/E5500/9800Pro/Vortex2/ME ]

Reply 17 of 19, by quicknick

User metadata
Rank Oldbie
Rank
Oldbie

POST card is priceless.

Actually, it is very cheap. It's the wait that kills 😁

I suppose the contents of the BIOS chip is OK, since it has booted before.

Reply 18 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t
quicknick wrote:

POST card is priceless.

Actually, it is very cheap. It's the wait that kills 😁

I suppose the contents of the BIOS chip is OK, since it has booted before.

I'm too broke at the moment 🤣

Yes, the BIOS chip contents are OK.

What should I look for that would hold the SB in RESET state?

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB

Reply 19 of 19, by PcBytes

User metadata
Rank l33t
Rank
l33t

UPDATE:
Verified pin A15 of PCI slot, 3.36v.

"Enter at your own peril, past the bolted door..."
Main PC: i5 3470, GB B75M-D3H, 16GB RAM, 2x1TB
98SE : P3 650, Soyo SY-6BA+IV, 384MB RAM, 80GB