Sony Vaio VGNFS195VP system board power problems

[enigmatic]

Hey guys, new to this board wasnt too sure on where to post this so i thought id put it here, sorry if i made a mistake

i've posted on other boards heres my post http://www.hardwareanalysis.com/content/topic/58510/

but looking around here it seemed more relevent to post as it seems a power issue.

Hopefully somebody can shed some light to help me out a little

thanks guys

[willawake]

Re: Sony Vaio VGNFS195VP system board power problems

got a pic of the small burnt looking chips?

i will quote your posts here for people's convenience

Ok awhile ago liquid got spilt into my system, i cleaned it all out with an alchohol cleaner, it powered back on

the lcd screen backlight, goes off after 20mins, i can hear a buzzing noise where the dc power jack is located, its a clip out jack so i thought about replacing this but the cost is stupid!

i've noticed on the board there are a few small chips that look burnt, now matter how much i've cleaned and brushed with a toothbrush it remains.

i looked at replacing the board but after checking the prices again $450 is too much!
anybody know a place to get them cheaply? ive checked out http://sparepartswarehouse.com but still they are up there with the expensive bunch, and they order direct from sony so its a no go.

anything else i could try with the board, such as kapaton tape (or whatever its called) or something that would keep the chip cool, as im thinking it gets overloaded from the heat after awhile.

thanks peeps

Ok just to reitterate,

heres my problem im really hoping someone who knows anything about this will reply as this laptop is my lifesource and without it im lost, and not able to afford another for awhile.

ive searched the forums and found some useful threads but nothing that will help me, my model is the VGNFS195VP

I apologise for the long thread beforehand but i need help guys!

i believe its a power issue, if you read my previous post it will fill you in

whats happening is that after i've cleaned down the board i got it to work and power on, but the problem is the screen will not last long before the lamp dies, i dont think its anything to do with the cathrode at all, because i hear an electrical whine coming from the power jack, so it has to be something to do with the power point on the board

it will power on after a few mins of waiting, and i can get it to function OK for about 30mins before the screen lamp dies, everything else remains OK.

before it does this i hear something like a power surge, (high pitched whine) right before it dies.
replacing the board isnt an option as i cant seem to find one cheap enough.

the power source is 19.5 volt and this works fine with my other laptop so its not this.

any ideas guys?

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

thanks for quoting for me i should of realised that but thankyou.

i cant take any pictures as my cam has been borrowed and is currently in brazil

its a rather small rectangluar chip with two prongs into the board, one looks rather crispy but not sure if that has anything to do with the power at all.

it will start up but only when it feels like it, i press the button and it doesnt start right away, sometimes 3-10mins!

its rather odd, but expected as a drink was spilt into it maybe i can save it mabye i cant but you gotta try right?

thanks for that dude appreciate it.

[willawake]

Re: Sony Vaio VGNFS195VP system board power problems

like one of these? what is written on the top of yours.

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

no its not like that its very very small, i will take pictures asap

i've noticed that if i attempt to connect the battery, the battery light flashes, but within windows it tells me that the battery is either not compatible or something else is wrong.

and when i look in the power status it reads as discharging

im not sure anybody can help me here, but its worth a shot and thanks for looking guys!

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

also the battery light is always on, even when no battery is there, its gotta be a power problem, or a short, or a bad ground point! ahhh its not fair!!

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

ok it looks like my posts are getting confusing now as i talk to myself here

another thing i've noticed is when i close the lcd lid once the backlight has died, it makes a buzzing noise and comes back to life, but only temporairly for about 20mins or so.

i've had a look at the sleep button and that seems fine nothing is touching it.

[willawake]

Re: Sony Vaio VGNFS195VP system board power problems

laptop was working perfectly fine before the incident, no buzzing or power problems ever?

its difficult to troubleshoot actually. we will need to see pics of the burnt items and also some overview pics of the board to figure out what part of the circuit they are in. i am guessing they are fets in the charging circuit. if one is actually burnt i doubt it happened before the incident.

it will power on after a few mins of waiting, and i can get it to function OK for about 30mins before the screen lamp dies, everything else remains OK.

before it does this i hear something like a power surge, (high pitched whine) right before it dies.

hmmm....what is that? some circuit starting which fails or something gets hot enough to fail at that point? interesting

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

yeah i really will have to post pictures of the whole board soon as i can,

well its ok, for at least 20mins, then its as though perhaps it gets hot and dies, but all the nescasary cooling is present and fine

is there a way i can view a schematic of the circuits on the board to find out where the power line runs, maybe i can see if there are any abnormalities?

its rather odd indeed but thankyou for your help so far!

[willawake]

Re: Sony Vaio VGNFS195VP system board power problems

is there a way i can view a schematic of the circuits on the board to find out where the power line runs, maybe i can see if there are any abnormalities?

i seriously doubt the availability of that

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

yeah i guessed that would be the case, like asking the white house for a key

ok, so how about diagnostic software, or hardware... im sure sony use this rather than check each component one by one

maybe this would tell me a little bit more..

i've seen pci tools but my system has no pci socket i dont think

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

yeah i guessed that would be the case, like asking the white house for a key

ok, so how about diagnostic software, or hardware... im sure sony use this rather than check each component one by one

maybe this would tell me a little bit more..

i've seen pci tools but my system has no pci socket i dont think

Ok now its getting odd, if i hold the laptop in an upright posistion (sideways) the lcd backlight does`nt cut out!

but there has to be a fault with a circuit somewhere otherwise the battery would charge up right?

[arneson]

Re: Sony Vaio VGNFS195VP system board power problems

Screen problem sure sounds like the inverter coupler cap. They will whine awile and work intermittant before they roast.

Is it possible the battery itself was wet?
Most of the battery charge and control circuits are in there.

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

well the whine comes from the power source, the point where the dc power point is on the motherboard if you understand? even without the lcd plugged in it still makes this whine noise

if only i could get my hands on a new dc lead to test if the fault is there, but they are just sooooooo expensive.

btw i hate sony

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

ok so now im thinking its the components getting too hot, as i hear the fan cutting in and peaking to max throttle to cool the cpu

what can i use for cooling, i have used arctic silver in the past.
but there are little sticky pads on this, where can i get them from
and also, it now takes awhile to power up after hitting the power button, like the circuit is warming up or something

[willawake]

Re: Sony Vaio VGNFS195VP system board power problems

can you use a utility to get temperature readings from the mobo sensors. it would be interesting if a sensor or monitoring circuit became defective from the water incident and the shutdown was a thermal shutdown triggered by an incorrectly high thermal reading.

i have no idea whether you can remove the cpu heatsink to replace the TIM. arctic silver would be fine. there are a lot of reports of vaio notebooks having thermal problems also due to dust inside etc. seems the cooling systems are just enough to be satisfactory.

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

yes i can take the heatsink away to apply thermal paste, but as for temp readings i dont have any, there are none in the bios like i thought there may be.


im getting my cam back over the next few days, so i'll take a few close ups of the entire board maybe you wil spot something i havent

thanks

[enigmatic]

Re: Sony Vaio VGNFS195VP system board power problems

just to update, i've checked against other boards and its definatly a dead board well, half dead and not just a bad circuit, the circuit itself was fried as i mentioned the chips that were burnt out supply the power back and forth to the lcd and other parts and when underload it cuts out and kills the lcd lamp

sad ending

but now i've got the task of finding another system board thats under £200 wont be easy as sony are tight about upgrades

[gonzo0815]

Re: Sony Vaio VGNFS195VP system board power problems

If you provide some pics there is some hope that we can help you. Power sections in laptops are usually not that complicated, in most cases there is an buck step down converter, an charge controler and a high voltage circuit for the lcd light. May be all those funktions are integrated in one chip. As far as there aren`t mutch SMD components you can repair it probalby. But if the 19v dc has reached the cpu or other circuits there is no hope enymore.......

[willawake]

Re: Sony Vaio VGNFS195VP system board power problems

But if the 19v dc has reached the cpu or other circuits there is no hope enymore.......

since it works for 20mins, looks like that did not happen