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Loss Of Video Signal


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#1 westislandbrewer

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Posted 17 June 2007 - 08:55 PM

Hello,

I have a hp d530 slimtower 2.4ghz. After a few minutes of running the computer I lose the video signal. The computer doesn't turn off but the video signal is lost. I am using the on board video output. I tried installing a pci video card but the same problem occurs. Anyone out there know what could be at the root of this problem. Thanks in advance.

Philip Moogk

(Moderator edit and note: the Member has posted about the same problem in another forum. See the thread:

http://www.bleepingcomputer.com/forums/t/97765/loss-of-video-signal/

John)

Edited by jgweed, 29 June 2007 - 06:35 PM.


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#2 acklan

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Posted 18 June 2007 - 12:32 AM

Have you tried a different monitor?
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#3 westislandbrewer

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Posted 18 June 2007 - 07:47 AM

Hello,

Yes I have tried different monitors, still the same problem. Sorry, I should have mentioned that in the first post.


Philip

#4 DaChew

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Posted 18 June 2007 - 09:27 AM

have you ruled out overheating?
Chewy

No. Try not. Do... or do not. There is no try.

#5 westislandbrewer

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Posted 18 June 2007 - 10:36 AM

Hello,

How do you do that? I assumed that as the computer was still powered on( i.e. you can still hear the cooling fan running and power light is still on) it had not overheated, but obviously I could be wrong. How do I check for this? And how do I fix an overheating problem? More powerful cooling sink and fan?

Regards,

Philip

Edited by westislandbrewer, 18 June 2007 - 10:43 AM.


#6 DaChew

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Posted 18 June 2007 - 11:02 AM

it might not be the cpu overheating but the northbridge chipset? if a pci vid card is doing the same thing tho??

if heat is the problem cleaning case fan and/or power supply fan(often cooling critical in book pc's) and having the whole unit
get more fresh cool air will tell the story
Chewy

No. Try not. Do... or do not. There is no try.

#7 westislandbrewer

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Posted 18 June 2007 - 05:48 PM

Hi Chewey and Acklan,

Thanks for all your help. I have previously cleaned off the heatsink and given the inside a good vacuuming. So I think the problem might be the northbridge chipset as you mentioned. Is there anything I can do to fix this or do I need a new motherboard?

Regards,

Philip

#8 DaChew

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Posted 19 June 2007 - 08:32 AM

http://h18002.www1.hp.com/products/quicksp.../11632_div.HTML

which one of these is it?

have you looked in bios for a temperature reading?
Chewy

No. Try not. Do... or do not. There is no try.

#9 westislandbrewer

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Posted 19 June 2007 - 11:24 AM

Hello Chewy,

I have the Ultra-slim Desktop model. I haven't looked at the bios temp yet as I have never done that. I will google that and try to figure out how to do it and post the results.


Regards,

Philip

#10 westislandbrewer

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Posted 20 June 2007 - 12:15 PM

Hello Chewy,

Here are the results of what I did. I did two things:

1) I placed a temperature probe (uei multimeter) beside(probe in direct contact with side of chip) the cpu. I loss video signal at various temps once at 38 Celcius and also at 42C. This is nowhere near the 72C Maximum Case Temp as listed on Intel spec sheet.

2) I downloaded and installed Everest Home Edition and it said the motherboard temp was 34 C prior to losing video signal. I did this a second time and loss video at 30C.

There doesn't seem to be any consistency here. Is there anything else I can do?

Regards,

Philip

#11 DaChew

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Posted 20 June 2007 - 01:31 PM

well that pretty well rules out overheating of chipsets, how are the voltage rails?
Chewy

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#12 westislandbrewer

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Posted 21 June 2007 - 07:12 PM

Here is what I got for voltage info from the Everest Home Edition program:


Field Value
Sensor Properties
Sensor Type Analog Devices ADT7460 (SMBus 2Eh)
Temperatures
Motherboard 24 C (75 F)
Aux 30 C (86 F)
Maxtor 6E040L0 20 C (68 F)
Voltage Values
+3.3 V 3.35 V
Debug Info F FF FF FF FF FF FF FF FF
Debug Info T 80 18 1E 81
Debug Info V 00 00 C3 00 00


Is this what you were refering to for the voltage rails?


Philip

#13 DaChew

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Posted 21 June 2007 - 08:20 PM

Voltage Values:
CPU Core 1.71 V
Aux 1.71 V
+3.3 V 3.38 V
+5 V 4.95 V
+12 V 12.67 V
-12 V -12.59 V
-5 V -4.77 V


from my sensor you can see everything is within a 5 or 10% tolerance on all rails
Chewy

No. Try not. Do... or do not. There is no try.

#14 westislandbrewer

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Posted 27 June 2007 - 12:59 PM

Hello,

My voltage values seem ok too. Should I throw in towel and buy new motherboard or would you suggest something else?


Regards,

Philip

#15 DaChew

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Posted 27 June 2007 - 01:34 PM

boot into safe mode and see if it does it, might indicate a driver issue if it is ok
Chewy

No. Try not. Do... or do not. There is no try.




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