Desktop motherboard fan spining no display

[imgaurav86]

Hello everyone,

I need help from you guys to troubleshoot my Asrock S58 Extreme motherboard. Motherboard turns on, fan spins but no display. The post card show nothing only FF. Problem was intermittent before and after turning it on and off few times it used to work but now won't show anything. I have tested CPU voltage .9v, Ram voltage 1.5V. Cpu heats up a bit. There is no clock running at 32.768 khz crystal. Where should I start, should I suspect the bios or it will be some thing else.

Is there any testing points to find out what has gone bad?

Many thanks in advance.

[ala_borbe]

Re: Desktop motherboard fan spining no display

try reprogramming the bios

[imgaurav86]

Re: Desktop motherboard fan spining no display

Hi ala_borbe,

Thanks for replying. Where can I get the bios file from.

[dspok]

Re: Desktop motherboard fan spining no display

You can get bios file from manufacturer website.

[ravi_1617]

Re: Desktop motherboard fan spining no display

if board starts after shorting power pin then chances are crystal is working.

[imgaurav86]

Re: Desktop motherboard fan spining no display

Hi There,

Thanks for replying. The board turns on after shorting the pins but, I have checked 32.768 crystal with oscilloscope close to south bride and CMOS battery does not have any Clock running. If I download the bios from manufacturer website would it be complete bios. Can I flash bios using hot swap method on other board if yes what program I can use.

[fddizon]

Re: Desktop motherboard fan spining no display

would it be right to test the board using diagnostic card with memory module on?

without memory module, no display will come

[ravi_1617]

Re: Desktop motherboard fan spining no display

ya you can test it with & without ram. for that only dignostic card r made for

[ala_borbe]

Re: Desktop motherboard fan spining no display

does it show anything else before ffff?
check voltage on every coil, check mosfets for shorts

also, asrock mostly have pour power design of power rails so they often fails if high power consumption cpu is used (high clock speed)

often i find bad transistor on chipset power (C5706 on some boards) shot, and similar symptoms displayed...

here is bios from website (MSI, GIGABYTE, ASROCK often suffer bios fail) but backup your bios first

edit, check red place for shorts on image

[imgaurav86]

Re: Desktop motherboard fan spining no display

Hi ala_borbe,

Thanks for your help. FF is the first thing it shows as soon as I turn it on

I have checked the voltage on every coil and they seems fine as far as I understand. Check picture I marked the voltages on it.

I don't have programmer to flash bios but I am looking forward to buy one. Is that cheap 24 25 programmer any good??(link)http://www.ebay.com.au/itm/USB-24CXX...item4d256d5428

Can I flash the bios using hot swap method on other motherboard if yes then which program should I use.

[imgaurav86]

Re: Desktop motherboard fan spining no display

if board starts after shorting power pin then chances are crystal is working.

Hi Ravi,
It was me doing it wrong. It does have the clock running at 32.768 crystal. I flashed the bios aswell but didn't fix the problem.

What should I do next??

[kaboom]

Re: Desktop motherboard fan spining no display

Hi Ravi,
It was me doing it wrong. It does have the clock running at 32.768 crystal. I flashed the bios aswell but didn't fix the problem.

What should I do next??

How did you flash the chip?

Find the datasheet for the BIOS EEPROM and locate the reset and data/address lines.

Scope them. Reset should go hi with application of power, drop lo, then go back up. Right after it goes hi again, there should be activity on the data/address lines.

Use a 10X probe on that 32.768 kHz xtal, direct probe causes too much loading.

Try firm pressure on the large bridge chips- BGAs going bad?

[imgaurav86]

Re: Desktop motherboard fan spining no display

How did you flash the chip?

Find the datasheet for the BIOS EEPROM and locate the reset and data/address lines.

Scope them. Reset should go hi with application of power, drop lo, then go back up. Right after it goes hi again, there should be activity on the data/address lines.

Use a 10X probe on that 32.768 kHz xtal, direct probe causes too much loading.

Try firm pressure on the large bridge chips- BGAs going bad?

Thanks for replying

I found the datasheet and checked the voltage but no movement. I cannot identify the reset pin at the bios. See attached photo for the voltages level.

After using the prob at 10x I can see 32.768 khz at xtal.

I tried to put pressure on the chips but no luck.

Whats next???

[kaboom]

Re: Desktop motherboard fan spining no display

Thanks for replying

I found the datasheet and checked the voltage but no movement. I cannot identify the reset pin at the bios. See attached photo for the voltages level.

After using the prob at 10x I can see 32.768 khz at xtal.

I tried to put pressure on the chips but no luck.

Whats next???

OK, that EEPROM uses a chip select instead of a reset line. It's pin 1. It seems that nothing is even attempting to load the BIOS, based on the lack of activity in your diagram.

Scope pin 3. Is there a 50% duty square wave or a DC voltage?

I think you should pull the CPU and inspect its lands and socket contacts. Use a cotton swab moistened with alcohol and clean it good. Now Intel says you shouldn't need to seal the lands, but starting with LGA775, I've always put a thin film of this over the lands.
http://www.permatex.com/products-2/p...-grease-detail

Hopefully, none of the lands or contacts have burned up.


I just finished recapping another "unfixable" P4P800-E. I soldered some good caps in for testing, but still zero activity at EEPROM. I gently warmed the entire board with a heatgun, since there were plenty of Elites and OSTs to be changed. After a few minutes, the board would finally POST! After a recap, it got interesting- all voltages, AGP, CPU, chipset, low and high RAM voltages, etc, were present as before. But no POST now! I had some doubts about the CPU socket, it didn't seem to latch tightly enough- a poor connection or dirt in the socket would certainly keep it from working.

I then clamped the heatsink on and it came up perfectly! Either the socket's soldering to the board is suspect, or there's dirt inside the socket. I haven't determined which yet. Either way, I'm hoping not to have to use the heatsink's clamp force to push on the socket's BGAs. Intel was crazy when the spec'd the 478's clamping force- way too much. Those bent motherboards were not exaggerations.

Everything on your board could, in theory, be perfect, but one bad connection out of the CPU's many will keep it from working.

Good luck!

[imgaurav86]

Re: Desktop motherboard fan spining no display

OK, that EEPROM uses a chip select instead of a reset line. It's pin 1. It seems that nothing is even attempting to load the BIOS, based on the lack of activity in your diagram.

Scope pin 3. Is there a 50% duty square wave or a DC voltage?

I think you should pull the CPU and inspect its lands and socket contacts. Use a cotton swab moistened with alcohol and clean it good. Now Intel says you shouldn't need to seal the lands, but starting with LGA775, I've always put a thin film of this over the lands.
http://www.permatex.com/products-2/p...-grease-detail

Hopefully, none of the lands or contacts have burned up.


I just finished recapping another "unfixable" P4P800-E. I soldered some good caps in for testing, but still zero activity at EEPROM. I gently warmed the entire board with a heatgun, since there were plenty of Elites and OSTs to be changed. After a few minutes, the board would finally POST! After a recap, it got interesting- all voltages, AGP, CPU, chipset, low and high RAM voltages, etc, were present as before. But no POST now! I had some doubts about the CPU socket, it didn't seem to latch tightly enough- a poor connection or dirt in the socket would certainly keep it from working.

I then clamped the heatsink on and it came up perfectly! Either the socket's soldering to the board is suspect, or there's dirt inside the socket. I haven't determined which yet. Either way, I'm hoping not to have to use the heatsink's clamp force to push on the socket's BGAs. Intel was crazy when the spec'd the 478's clamping force- way too much. Those bent motherboards were not exaggerations.

Everything on your board could, in theory, be perfect, but one bad connection out of the CPU's many will keep it from working.

Good luck!

Hi There,

I Started the whole things again today. I cleaned the CPU and reinstalled it properly. All the pins looks good.

I noticed if I put the oscilloscope setting to 2 volts per division and 5useconds I can see that the pin one goes low for half a micro second (as I saw in the datasheet for reading sequence). similarly, I can see some movement on pin 6 and 7 which are clock and data pin. But, it only happens once for half a micro seconds after that not movement.

Can this be because of bad bios?? Where can I get full bios image and how can I flash it properly. Can I install bios chip onto other motherboard and flash using AMI flashing utility.

[ala_borbe]

Re: Desktop motherboard fan spining no display

you have bios i posted above but i doubt hot swap will work... dunno, never tried with spi eeprom, but eeprom programmer will help you for sure

backup eeprom old content

[stj]

Re: Desktop motherboard fan spining no display

find the pll chip that generates the clock signals and get a datasheet for it.
and check the cpu is getting core voltage.

[AkumAone]

Re: Desktop motherboard fan spining no display

Try installing some RAM...

[momaka]

Re: Desktop motherboard fan spining no display

Ah, that AsRock is made by ASUS (those backwards cap polarity marks give it away). I don't like to discourage people, but it's not uncommon for ASUS and ASUS-made ASRock motherboards to die out of the blue with no symptoms.

I see you made some voltage measurments. There appear to be two buck regulators under the RAM slots (or perhaps one buck, and a few linear?), so there should be at least two voltages there. One of them should be for the RAM, the other for the NB and/or RAM Vtt (usually 1/2 RAM voltage). There are also some MOSFETs between NB and CPU heatsink slightly towards the left. At least one of them should be for CPU Vtt.

HowTry firm pressure on the large bridge chips- BGAs going bad?

Agreed. This could well be a BGA issue too. The heatsink on imgaurav86's motherboard appears to use those dreaded (by me, at least) push-pin locks to keep the CPU heatsink on. These are often known to warp the board over time.

Therefore, I say also try the CPU heatsink *without* clamping it to the motherboard. Just have the motherboard laying flat and put the CPU heatsink on it (with thermal compound, of course).

Either way, I'm hoping not to have to use the heatsink's clamp force to push on the socket's BGAs. Intel was crazy when the spec'd the 478's clamping force- way too much. Those bent motherboards were not exaggerations.

Yes, the design on most of the standard 478 heatsink clamps was very stupid. I just sanded the plastic latches on one yesterday to reduce the force a little bit. The poor Intel board was flexed under the CPU socket like a female's hind parts .

Unfortunately, this whole "board flexing" mess didn't end with s478. Starting with LGA socket 775 and up, every standard push-pin heatsink had this problem. Without a strong backplate, those push-pin locking mechanisms rely on the flexing of the board to apply pressure to the CPU heatsink - extremely poor design IMO. However, don't be fooled into thinking that a backplate won't let the motherboard bend. Most AMD socket 939 and AM2/2+/3 boards will still flex even with the backplate. It seems that these days, heatsink renetion bracket design has really gone down the toilet.

So with that said, a CPU socket reflow may be in order (as a LAST RESORT rescue) if nothing else works.