Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 2
Default A broken computer and power issues - howto diagnose?

Someone dropped off a broken computer about 15 days ago. The only symptoms
were that it didn't boot-BIOS/no-cpu-fan but greem-led-on-mobo was on.

I swapped out the PSU, etc and end result was that the CPU fan was toast
(didn't spin on a 3-wire header) and so was a gfx card (tried to POST on the
VGA of a working box - PCIe card)

Got it working and sent it back - put in a new fan) - unfortunately today,
the box is dead again. This time: the fan's fine, but the mobo cpu-fan won't
spin at all (no boot-bios) no matter what i do (swapped the PSU, ram, etc).
Green mobo-led is on (same as before).

I tested the cpu-fan (4-wire) on a 3-wire header and the fan spun up but
that doesn't exclude the possibility of a the ctrl line on the fan being
damaged.

1. What should I do?
2. Would it be reasonably honest to tell him to buy a new pc? I'll have to
junk the PSU/mobo/cpu/ and possibly ram too.
3. How do i exclude power issues (bad smps, wall power)? How likely is this
to be the cause of his misfortune?

(it's not a cmos issue, new battery, flushed cmos etc)
  #2   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 1,630
Default A broken computer and power issues - howto diagnose?

When you have a dead PC start removing things. In fact everything except the processor. With no RAM, no cards, no drives, ANYTHING connected except the processor and the power supply it should beep. Usually like three beeps or whatever in a row, and then it repeats.

If it does not do that, either the power supply, processor or motherboard are bad.
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hi, WOuld some kind soul help me diagnose my switch mode power supplies? Stephen[_13_] Electronics Repair 15 April 25th 11 06:12 PM
Sony XBR CRT Power Issues [email protected] Electronics Repair 1 December 6th 05 03:37 AM
Best Buy and Geek Squad computer privacy issues kr0 Electronics Repair 18 November 10th 05 11:04 PM
* Computer Hardware Question * - Broken Pin on Hard Drive GHZpc Electronics Repair 8 September 29th 05 05:51 PM
* Computer Hardware Question * - Broken pin on Hard Drive GHZpc Home Repair 11 September 11th 05 02:30 AM


All times are GMT +1. The time now is 03:07 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"