The Shop > Electronics & IC Programing
Pc broken
vtsteam:
One more possibility, too, check the power cord and its connection at the power supply. Wiggling it sometimes shows up a problem. Generally it's laptops that get their cord kicked, but sometime desktop power supplies can develop a problem.
Also there's a line into the main power cord connector on the motherboard that's a signal line from the PS on/off switch. If the contacts on the connector are getting dirty, that signal can be intermittent with heat.
Another cause, can be a cracked solder joint on the PCB where the CPU or memory sockets join. The board heats up expands the crack and the computer crashes. This kind of thing usually happens to specific models of computers, and so gets reported online enough that you can usually find references to it if you look up your model. I've seen it for the CPU on Asus boards, and on RAM for several models of older IBM Thinkpads.
David Jupp:
Odd PC problems I've suffered from having similar symptoms.
On an a Dell - turned out to be known issue on the particular model range - the processor chip lost contact with some connections of the BGA socket as it heated up. Solution in this case - jam a lump of cork between top of heatsink and case lid to put downward pressure on CPU/socket.
On a homebuilt PC - one 12v line of power supply failed, machine would get part way through boot, but when attempting to spin up the hard disks would re-boot (continuous loop of re-boots follows).
awemawson:
My main workshop desktop (Compaq Small Form Factor DC7600) did exactly as yours is doing a couple of weeks ago. After a bit of faffing around I proved it to the Power Supply. Blew it's dust out, checked for dry joints / exploded caps etc all to no avail so it ended in the bin. Fortunately I have a pile of DC7600's so could just pull a PSU from another one.
John Rudd:
Here's an update......
I'm currently typing this on the pc..so hopefully if its sorted then I'll have successfully posted this...
PC stripped to barebones, power supply out, case fan out, memory dimms/cpu with heatsink removed. Removed hdd and dvd rom drive leaving just the mobo in place.
Firslty examined the power supply, no bulging caps or toasted pcb....just a bit of dust nothing to write home about...
Quite impressed actually its not your usual power supply...Has PFC and uses one of the 3842 series of switchers as opposed to the usual Half Bridge type that usually commits hari kiri.... :zap: :zap:
So psu blown out and fan cleaned, re-assembled ready to put back.
Case fan cleaned up...no drama there.
Took the base unit to the garage, blew out all the dust,checked the caps on the boar, all appeared.
So onto re-assembly...
Slotted hdd and dvd rom drive back, added dimms, hooked up the drive cables, added psu.
Final leg of assembly, cleaned up top of cpu and mating face of fan/heatsink...Applied a liberal coating of my trusty Servisol heatsink compound....fan assembly re-bolted onto cpu, plugged fan into mobo, refit front panel and close up.
All hooked up to the peripherals and working fine so far...
Lets see how long before another drama unfolds..... :coffee:
Thanks to all contributors for their thoughts and experiences and a Happy New PC Year... :)
BaronJ:
Hi John,
I hope you weren't too liberal ;)
--- Quote --- "Applied a liberal coating of my trusty Servisol heatsink compound."
--- End quote ---
Glad you got it sorted :ddb:
Happy New Year :beer:
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