Troubleshooting Help - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > Hardware Repairs and Troubleshooting
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 03-12-2013, 09:19 AM   #1 (permalink)
Newb Techie
 
Join Date: Mar 2013
Location: UK
Posts: 13
Default Troubleshooting Help

I have a Sony VPCL13S1E that I am trying to troubleshoot. The PC turns on however it does not POST, no beeps or anything, the display is blank and nothing is shown. I have had a look at the motherboard and tried various things such as replacing bios battery checking all connections etc. I have found that when powered up some of the fans are running however the CPU fan does not start up, is this normal? I know some fans are set to only kick in when the CPU gets up to temp could this be the case? Anyway, this tells me that the MB must be getting power, also, I have tested the HDMI In, and it still functions as a TV, does this mean the graphics card still works or is this a totally separate thing?

Thanks for your help
__________________

-SeanS is offline   Reply With Quote
Old 03-12-2013, 10:00 AM   #2 (permalink)
Pushing Daisies on Saturn
 
Yevrag35's Avatar
 
Join Date: Dec 2012
Location: Wisconsin, US
Posts: 1,118
Default Re: Troubleshooting Help

So I take it you didn't get that new motherboard or scraped it for parts? (FYI for anyone wondering Identifying RAM)

If the HDMI works, the GPU is most likely not at fault. Does the screen even look like it's turning on at all but just no picture? You checked the connections from the screen to the motherboard?
__________________

__________________


Yevrag35 is offline   Reply With Quote
Old 03-12-2013, 10:46 AM   #3 (permalink)
Newb Techie
 
Join Date: Mar 2013
Location: UK
Posts: 13
Default Re: Troubleshooting Help

Quote:
Originally Posted by Yevrag35 View Post
So I take it you didn't get that new motherboard or scraped it for parts? (FYI for anyone wondering Identifying RAM)

If the HDMI works, the GPU is most likely not at fault. Does the screen even look like it's turning on at all but just no picture? You checked the connections from the screen to the motherboard?
To be honest I thought I'd hold of a little because I'm intrigued as to what exactly is wrong, I was just going to keep an eye out for a machine that has a smashed screen or something and maybe I could take the MB from that, but if not I'll sell for parts. But for now I just wondered if there was a way to find out exactly what is at fault here, I only checked the main connections really so I'll see if I can locate the connections for the screen to MB, what do you think about the CPU fans not running, is this normal? My initial thought was maybe these broke in the past, causing the CPU to overheat or the northbridge chip?

Thanks
-SeanS is offline   Reply With Quote
Old 03-12-2013, 10:58 AM   #4 (permalink)
Pushing Daisies on Saturn
 
Yevrag35's Avatar
 
Join Date: Dec 2012
Location: Wisconsin, US
Posts: 1,118
Default Re: Troubleshooting Help

If the CPU fan is not running, then that's a problem.
Is there another 3 or 4-pin fan connector that you could try the cpu fan on?

If the fan runs connected to other fan connectors, then you know what the problem is. If not, that fan/heatsink has to be replaced.

That is the one fan you NEED running.
__________________


Yevrag35 is offline   Reply With Quote
Old 03-12-2013, 11:02 AM   #5 (permalink)
Newb Techie
 
Join Date: Mar 2013
Location: UK
Posts: 13
Default Re: Troubleshooting Help

Quote:
Originally Posted by Yevrag35 View Post
If the CPU fan is not running, then that's a problem.
Is there another 3 or 4-pin fan connector that you could try the cpu fan on?

If the fan runs connected to other fan connectors, then you know what the problem is. If not, that fan/heatsink has to be replaced.

That is the one fan you NEED running.
Ill give it a try and get back to you, I have another CPU which is compatible with the system, would it be possible to try this to see if I get anything or would the CPU burn out very quickly without the fan running? Thanks
-SeanS is offline   Reply With Quote
Old 03-12-2013, 12:30 PM   #6 (permalink)
Private Joker
 
carnageX's Avatar
 
Join Date: Feb 2007
Location: South Dakota
Posts: 24,516
Default Re: Troubleshooting Help

Check to make sure RAM is seated securely.

Try individual sticks one at a time.

There may be a RAM stick under the keyboard as well (common for laptops), as well as under the bottom-access panel.
__________________
Laptop: MSI GT70 2OC-059us | i7-4700MQ | 16GB | GTX 770m | 500GB SSD / 750GB HDD | 17.3" | Win10 Pro
Desktop: 4690k | 12GB g.Skill RipJaws | GTX 970 | 520hx | Z87X-UD4H | Corsair Vengeance C70 | Corsair H110 | Acer 25" | Acer 22" | Win10
Mobile: Samsung Galaxy Note 5


If I help you, or you just like what I said, rep me by clicking the under my post
carnageX is offline   Reply With Quote
Old 03-12-2013, 06:59 PM   #7 (permalink)
Newb Techie
 
Join Date: Mar 2013
Location: UK
Posts: 13
Default Re: Troubleshooting Help

Thanks for your comments, I've tried all the above to no avail. I tried the CPU fans in another 4pin connector for the PSU, the fans looked like they tried to start (spun for a second) then went off again. The PSU fan does connect to motherboard and power up fine however. Could it be that power is somehow not reaching the fans on the other end of the motherboard? It does look to me like it is the northbridge chip that is at fault after all. Do these sound like symptoms of a northbridge failing? It's frustrating that no matter what the screen is literally dead, it doesn't give me any indication that anything is happening at all.
__________________

-SeanS is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 12:18 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.