Intermittent Power (Laptop)

[xtiansy]

Unit: Toshiba Satellite L505/ Intel Chipset, Video & Processor

History: Spilled milk over the keyboard down to motherboard.

Problem: Intermittent Power

Resolution: Removed/opened all components, let them dry and reassembled.

Question: What can cause the intermittent power issue?

Fact/s: Never used the laptop battery on the unit. When AC adapter is plugged in, 1 LED light turns on indicating there's external power being supplied. Now, when the power button is pressed...sometimes it turns ON and sometimes there's no reaction at all. When it turns on, it's stable. No visible physical abnormalities on the motherboard components, under the magnifying glass. O_+


Your inputs will be very much appreciated.

[insomartin]

nose bleed english. hehehe

have you tried running the laptop without the batteries on?
how far you have eliminated the problem of the intermittent power on problem?

motherboard's post circuit must be acting... that's why sometimes, and sometimes not it won't turn on..

[xtiansy]

hehe!

matagal na po hindi ginagamit yung battery pack since it's not holding charge anymore. sa AC adapter na lang kumukuha ng power yung laptop.

[insomartin]

hehe!
matagal na po hindi ginagamit yung battery pack since it's not holding charge anymore. sa AC adapter na lang kumukuha ng power yung laptop.

nasa post yan. (power on self test)
it means may madumi pa sa pcb kaya nagloloko.
the best way nyan is hugasan mo nang joy yung motherboard. wag sabon or detergent kasi nagiiwan ito nang residue. unlike joy (you don't want soap on your food diba?)

[xtiansy]

nasa post yan. (power on self test)
it means may madumi pa sa pcb kaya nagloloko.
the best way nyan is hugasan mo nang joy yung motherboard. wag sabon or detergent kasi nagiiwan ito nang residue. unlike joy (you don't want soap on your food diba?)

haha natawa ako dito! sige boss i will try. pero mukang sa video chip kasi nagreheat ako ok na ulit, di nga lang tumatagal...hmmm!

[spoco]

just sharing..

na experience ko rin ganyan problem sa dati kong laptop. pero di natapunan ng kahit anong liquid. busted narin ang battery kaya ac power adaptor lang gamit ko. basta nalang nag intermittent ang power nya.

nung una po nilinis ko yung ribbon na nag connect sa power button papuntang board. nung ayaw parin ni try ko palitan ng ribbon since yung isa kong friend parehas kami ng model e hiniram ko yung sa kanya. nag work sya ng maayos kaya bumili ako ng ribbon at pinalitan ko yung luma.




 pinalitan ko yung ribbon wire na connected sa power button

[xtiansy]

thanks for sharing boss!

sa L505 hindi ribbon yung connection from motherboard to power switch. maliit lang na wire. and natest ko na din yung power button ok naman.

[spoco]

yung kay boss martin na suggestion ok yun. baka makuha sa joy... ginawa ko rin yun sa cpu ko dati.

sayang mahal narin pagawa kasi pa service ngayon ng laptop.

[ultrasonic™]

maselan  ito  dahil laptop.. kong desktop  sanay  pwedeng  i out of casing  yung  mobo..

on topic:

ang maisasuggest  ko  nlng  muna  ay  linisin ang  mga  contacts. slot ng ram, psu socket kng meron...  recheck  ulit kong dried  na  ba  tlga  ang main board ng laptop... bago balik sa testing...

pag ganun  pa rin  ay  labhan  na  yan  ng joy ultra
at patuyuin ng maayos.. baka  nacorrode na yan.. tama  ba  english  ko sis inso ? 

[xtiansy]

wehehe! nung feb pa to natapunan ng gatas. labo lang kasi pagnaka on na stable naman. hindi namamatay or whatsoever. kanina ayaw na talaga mag on. check ulit kung may corroded wala naman. checked power supply circuit ok naman. suspect ko video chip so nagreheat ako for a few minutes. nagoon na siya ulit, well mga 6 consecutive na ok. stress test muna ng video chip at cpu tignan ko kung bibigay yung reheat.

[Vaounsi]

what do you mean di po nagoon, pagpress po ba ng power button wala man lng led lights? o meron? pero di nagtutuloy?

[xtiansy]

may led light no naka ON pagnakaplug yung AC adapter. pagppinepress yung power button walang response. minsan gumagana, minsan hindi.

[ultrasonic™]

kong sure na  nasa  condition ang PSU adapter at power button ay go for it pa rin..

linis method  muna..
ram, hdd, cpu

xa nga  pala  check  nyu  ang reset button at power button  baka  laging naka on... it can cause ng failure  din yan

[insomartin]

tama  ba  english  ko sis inso ?  

yeh yor english is corright!

[Vaounsi]

may led light no naka ON pagnakaplug yung AC adapter. pagppinepress yung power button walang response. minsan gumagana, minsan hindi.

ecap lng salarin nito

[ultrasonic™]

yeh yor english is corright!

ganun  thanks  sa papuri  sis  inso..  hehehe  galing  ko tlga  sa  englishan 

kong sure na  nasa  condition ang PSU adapter at power button ay go for it pa rin..

linis method  muna..
ram, hdd, cpu

xa nga  pala  check  nyu  ang reset button at power button  baka  laging naka on... it can cause ng failure  din yan

may  kulang  pala  kong duda sa PSU adapter  buksan  ng magkaalaman  ng walang leak ecaps.
baka  pumapalya  kayo

[Vaounsi]

may  kulang  pala  kong duda sa PSU adapter  buksan  ng magkaalaman  ng walang leak ecaps. Grin
baka  pumapalya  kayo

agree!! psu adapter problem or sa mobo, karamihan buntis ecap lng salarin..
kung may mahiraman ka psu pang test mas ok, para go kana sa mobo troubleshoot

[xtiansy]

to isolate the issue. i removed the power button from the motherboard along with its connector terminal/wire, removed hdd/ram/lcd cable/etc.

kinuha ko ang motherboard, power supply at power supply port with wire going to the motherboard.

pagsaksak ng power supply, 1 LED light turns ON.

shorted the power switch terminal to turn the system ON, no go.

removed HSF.

took my rework station, 4/4 setting.

blew hot air on top of the video chip for about 3 minutes.

pressed the chip down gently.

reapplied silver thermal paste on processor and video chip.

replaced video chip thermal pad with copper shim.

reinstalled HSF.

plugged the AC adapter.

shorted power switch terminal.

it's back to life!



did the shutdown and power on process for about 20x now, still has not failed. it's still naked though...hehe!

AC Adapter is in good shape, never dropped at least a volt when system is ON.

[Vaounsi]

nice congrats!!!

[insomartin]

pa OT LANG:

REWORK BA KA MO?!