View Single Post
  #7   Report Post  
Posted to sci.electronics.repair
Mike De Petris Mike De Petris is offline
external usenet poster
 
Posts: 26
Default motherboard cpu power section check

On Aug 13, 6:41*pm, Meat Plow wrote:
On Fri, 13 Aug 2010 09:25:13 -0700, Mike De Petris wrote:
On Aug 13, 4:23*pm, Meat Plow wrote:
On Fri, 13 Aug 2010 04:55:24 -0700, Mike De Petris wrote:
On Aug 13, 1:43*pm, Ken wrote:
Mike De Petris wrote:
My laptop freezes when I connect the power cord, works well on
battery only.


I want to check the motherbard in search for the faulty component,
where could I find pinouts and voltages to check for?


Toshiba Satellite A205-S4577 (PSAF0U-01Q009)


Laptop Motherboard: MAIN BOARD 945GM. Main Board 945GM EXC+51
CA+MIC MDC 1310A2120812 Alternate Part Numbers: V000108030


Processor:
LF80537 * *T5300
5648B999 *SL9WE
1.73/2M/533
INTEL... copyright 06


* * * * I don't know about acquiring a schematic for trouble
* * * * shooting the MB,
but the first thing I would do is test the power adapter with a load
attached. *I have repaired several that output the correct voltage
but failed to regulate when loaded down.


* * * * Also, some Toshiba Satellite computers were notorious
* * * * for having power
connector problems. *I trust this computer does NOT have such a
problem?


no problems on the connector
tried different power supplies, even stabilized laboratory psu


Did you try cleaning the air ducts? When on batter the CPU 'may' be at
a reduced clock speed via Toshiba Power Management when on battery.
When on the PSU, the CPU will go to full speed and may just be over
heating.


Food for thought --


thank you, anyway please consider the laptop is completely teared a
part, non problems of air flow, and when connectinh power it locks
immediately even if in the BIOS pages


Had no way of knowing since you didn't mention these additional facts in
your original post.


I'm sorry, I'm just forgetting pieces as I wrote this long story many
time in different newsgroups and forums, and still need to find a
solution.

Anyway I can still use the laptop on battery, or giving 12V with an
ATX PSU in place of the positive battery pole, leaving other battery
contacts in place.