motherboard cpu power section check
in [Repair]
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From: Meat Plow on 13 Aug 2010 12:41 On Fri, 13 Aug 2010 09:25:13 -0700, Mike De Petris wrote: > On Aug 13, 4:23 pm, Meat Plow <mhyw...(a)yahoo.com> wrote: >> On Fri, 13 Aug 2010 04:55:24 -0700, Mike De Petris wrote: >> > On Aug 13, 1:43 pm, Ken <K...(a)invalid.com> 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. -- Live Fast, Die Young and Leave a Pretty Corpse
From: Mike De Petris on 13 Aug 2010 13:14 On Aug 13, 6:41 pm, Meat Plow <mhyw...(a)yahoo.com> wrote: > On Fri, 13 Aug 2010 09:25:13 -0700, Mike De Petris wrote: > > On Aug 13, 4:23 pm, Meat Plow <mhyw...(a)yahoo.com> wrote: > >> On Fri, 13 Aug 2010 04:55:24 -0700, Mike De Petris wrote: > >> > On Aug 13, 1:43 pm, Ken <K...(a)invalid.com> 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.
From: Meat Plow on 13 Aug 2010 15:13 On Fri, 13 Aug 2010 10:14:22 -0700, Mike De Petris wrote: > On Aug 13, 6:41 pm, Meat Plow <mhyw...(a)yahoo.com> wrote: >> On Fri, 13 Aug 2010 09:25:13 -0700, Mike De Petris wrote: >> > On Aug 13, 4:23 pm, Meat Plow <mhyw...(a)yahoo.com> wrote: >> >> On Fri, 13 Aug 2010 04:55:24 -0700, Mike De Petris wrote: >> >> > On Aug 13, 1:43 pm, Ken <K...(a)invalid.com> 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. Usually those things run off a 19 volt 95 watt PSU. -- Live Fast, Die Young and Leave a Pretty Corpse
From: Ken on 13 Aug 2010 15:54 Mike De Petris wrote: > On Aug 13, 6:41 pm, Meat Plow<mhyw...(a)yahoo.com> wrote: >> On Fri, 13 Aug 2010 09:25:13 -0700, Mike De Petris wrote: >>> On Aug 13, 4:23 pm, Meat Plow<mhyw...(a)yahoo.com> wrote: >>>> On Fri, 13 Aug 2010 04:55:24 -0700, Mike De Petris wrote: >>>>> On Aug 13, 1:43 pm, Ken<K...(a)invalid.com> 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. > Have you looked at the MB power bus (+5v I would assume) for ripple when you attach the external power supply?
From: Mike De Petris on 13 Aug 2010 16:03 On Aug 13, 9:54 pm, Ken <K...(a)invalid.com> wrote: > Have you looked at the MB power bus (+5v I would assume) for ripple > when you attach the external power supply? this is what I am asking for, I tought I should measure it at the socket pin holes, how can I idetify the +5V line on the motherboard? And how would you measure (and fix the cause) a ripple on the bus? I have a couple of scopes and multimeters for that, but how?
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