Toshiba Satellite C55, no POST, power cycling - LFC#280

[Music] hello interwebs welcome to let's fix computers uh i've got a toshiba satellite c55 here that does not post so we've got power light we've got charge light it turns on nothing on the screen and i can hear the fan going and the fan keeps going up to high speed and then calming down again very periodically so it sounds to me like it's it's some uh power cycling so i'm going to turn it off and the first thing we're going to do to try and approach this is we're going to check on the ram and we're going to check on the cmos battery so let's flip this guy over and we'll take the battery out and luckily this is quite an old boy so we've got um access to the back which makes life a lot easier if i'm really lucky i'll be able to get to the cmos battery or the rtc battery from here as well yeah there it is bang in right so firstly let's just try uh let's try cmos battery so we'll just pop that guy out [Applause] and while that's out let's just check the voltage on it and our survey says 3.13 that's fine it's a three volt nominal battery so the battery is not flat so i'm going to leave that for two minutes or so and we'll just see if it comes good right polite time period has passed bam i shall power it on without the battery in so that way i can easily power it off by just pulling the plug again right charger in we have a charge light on the front power on we have a very dim power light and fan noise again i'll give it some time in case it's ram training sounds like it's doing exactly the same thing with the fan ramping up and then down again yeah okay not by or at least not the rtc battery let's pop out the memory modules i'm also going to take out the hard drive at this point uh the hard drive will be nothing to do with the fault um or at least almost certainly not i have seen bad hard drives block post before very very rare though not something i would expect to see however i'll take the hard drive out just so we're not constantly cycling the hard drive power with customer data on it and stuff all right this guy gives a ram in it it does color me impressed all right so i'm going to drop both of those out and i'm going to drop in some scrappy memory module that i've got lying around somewhere there you go here's a 2gig module love that in there so we'll try it in the first slot then we'll try in the second i think it's power cycling yeah power light is coming on and off no fan noise though this time i don't know what to make of that it's doing something different though which is the important thing i don't actually know if this module works let's just try moving that to another slot power light and it's off again yeah same thing okay so it doesn't like that memory module i'm guessing this memory module is crap let's just try putting in one of the original ones and we'll just try that in one slot and then the other i mean we're getting a different reaction which is a star just getting the getting the device to do something else is always a good start same thing again try that one in the other slot still with the power cycling okay let's try the other module on its own i'm gonna do another bios reset in a sec just because i feel like i'm getting punked um like i feel like the bios is now stuck because we've messed with the memory yeah again same thing all right so now we're going to reset the bios again polite time period has expired what say you now toshiba satellite same hecking thing okay i think this is worth a bios flash yep still power cycling let's take this thing apart i shall put the memory back in just because it doesn't need to be hanging out the bottom anymore so we'll put that how it was and zap these screws out oh it's one of them old tiny toshibas where the keyboard comes up from the bottom a socketed cpu that's not a great sign so our bios chip is down here focus the giveaways it's got wind bond written on it which uh well also that it's a um it's an 8 pin sop 8 with winbon written on it that is going to be our bios chip so that is a 25 q32 fvs if i can read that from here on the screen um so i'm going to take that off the board and i'm going to try and reprogram it so i will take the cpu cooler off first because if i hit this area with hot air i'm going to be putting hot air into the cooling system which isn't ideal so let's uh back that guy out and then we can probably hot air this off the board without removing everything although actually no we're good we're good thermal paste is still good after all these years right now before i actually take this guy off the board i'm just going to double check that i can actually find a bios for it however that will require me to get the model number of the board i think so i'm actually going to have to take this out after all something something the lazy technician does twice as much work and then puts his finger in the thermal paste better in the long run to take the board out anyway just being lazy we actually have any screws yes we do have a screw holding that down check the other side of the board just for good measure yeah other than being dusty that looks fine to me cool right so now on this side we can see all of the board numbers and stuff like that that's the one i'm after i reckon pt10f probably yet so there is actually two bios chips on this motherboard which is quite common on laptops um there's a main bios and an eat and what's known as the ec bios the ec1 generally contains the intel management engine stuff and other firmware for the um ec chip also known as the supra super i o stuff like that a lot of interchangeable terminology there are correct terms here not 100 certain which is which the point is there are two bios chips on most of these laptop motherboards um i thought that was just generally a hp thing but apparently it's certainly the case on this one as well so i had a closer look uh so there's the win bond chip that i pointed out there's another guy over here which is also an mxic chip so that's probably going to be our other one i'm going to look up the data sheets for both of those because then we can confirm which one is which because we're going to find that one of them is bigger than the other and that helps us to tell which is our main bios and which is the ec bios so let's start with the win bond chip and as i mentioned earlier on that's a 25 q32 fv so let's look that up so that is a 3 volt 32 megabit chip and so if we convert megabits to megabytes by dividing by eight it means it's a four megabyte file and as you can see our main bios file that i've got here is four megabytes so that tally so that is the main bios chip and then the other one is two megabytes so we're probably going to find that that's a 16 megabit chip so let's check that one out just for reference i've got this from good old bad caps google search it there we go and that guy's an mx 25 l16 which is going to be 16 megabits so there's our other chip um i may as well do both since i've got them both um so yeah let's do them both so let's get both these chips off of the board so as you can see we've got a highlight in the top left of each chip indicating where pin one is and that is in the i mean when you read it with the writing the correct way up it's actually the lower left of the chip there's one and i'll just turn the board [Applause] and there's two so to reprogram these chips i'm going to use my rt809f with a sop 8 socket adapter here now this adapter can be a little bit sketchy and there are ways to make it a bit more reliable i need to get a little bit of sandpaper to sand the bottom of the chip really um or sand the bottom of the legs rather and that would make sure they get better contact but the good thing about the rt809f is that it can detect bad pin connections so it'll usually tell me if there's something wrong so i'm just going to get that guy in and just give him a little bit of a wiggle just to make sure it's seated nicely there we go and in it goes so this was a 25 q32 fv soic8 that's good enough for me okay and let's try and go for a read that looks very promising excellent right we'll take a dump of that save now i'll open the new one i've got so it's just sort by name dash right so i can do a verify here but the verify will probably fail because i think this is an updated bios yeah chip verification error not surprising to be honest um that's exactly what i expected but we'll write it anyway let's go so i've loaded that let's go for the right bam excellent that one's done so now we're going to swap the chips out and we'll put the other fella in there and that was an mx-25 1673e stop8 bam okay read go cool save it and open and once again i'll verify it just out of interest no i verify it because if it came back as verification successful that tells me that we didn't actually need to program it however i'm not actually expecting it to come back because as i say i almost certainly have an updated version of the bios anyway so or it might be an older version of the virus i'm not actually sure as long as it's our working bios that's all that matters right that's done good all right let's get those two back on the board so i shall just quickly run some solder over these pads just so they don't go horrible and dry and then we should just be able to hot air straight back down onto them again and nice and i'll just touch up those joints again i found it's very very worth touching up the joints after you hot air these chips back on the board um just because most of the time you're okay but i've been pumped a couple of times where just the solder joint isn't quite there and just running over all of them with a soldering iron afterwards just seems to just guarantee that you're good look okay let's see if any of this was worth doing you okay everything is connected up i think we could try and power this thing on uh what's still on the bench yeah just hard driving cases good uh can we power button from here we can we do not need the keyboard connected all right plugged in the power cable the power light has come on oh there's a wi-fi light i don't think we've seen the wi-fi light oh my word ah look at that rtc battery is low no it's not it's just saying that because it's been reset beautiful oh yes happy days that's uh it's 6 p.m on a friday afternoon as i film this so that's a good end to the day that is beautiful okay i'm just going to power that off on account that people will shout at me if i don't i'll change the battery anyway there we go new battery fitted and we can start putting this back together again so let's put on the bottom case [Music] there's the dvd drive there it is so while i put this on let's just quickly discuss the repair there so we had a system that was power cycling and when you're looking at a laptop that does not post and you've gone through the obvious stuff you know you've reset the bios you've checked the memory that kind of thing if you have power you know if the system turns on as it did for us we know it's very unlikely to be um it's very unlikely to be a power issue you know it's very unlikely that there's a short circuit or anything like that because if there is any kind of short circuit and one of the power rails isn't coming up then the laptop would not switch on it would not reach an so state because it needs to come up through the lower power states first and most motherboards will have power good signals like if we use a macbook as an example now macbooks obviously have the most signals in them but the macbook has a signal called all sys power good and all cis power good it requires all the other rails in the laptop to be up before that signal will go high and if that signal does not go high the system will not turn on you will not get fan spin so um there's likely a similar thing in here so if you're getting fan spin and there's you know power lights you know and it's trying you're not going to have a powerful so at that point if it's not the memory then you've got to say okay well if this was a desktop what would i do so at that point it's now reasonable to assume there's an issue with the bios so we reflash the bios using the flashing tools we've got and hey ho we have a repair and truth be told that's not something i've done very often for laptops i've done a couple of these however i've done it more often on desktop boards so it makes me very happy to see the methodology that i've practiced on desktop motherboards be compatible with fixing laptops as well and you'll see the other way around as well you know techniques that you can use on a laptop will often work on a desktop of course the only unanswered question was was it the main bios or the ec bios we could have done them one at a time um i would wager it was the main bios but i'm not an expert either way we had the ability to do both so it doesn't particularly matter and we're now booting into windows so that's us done uh cut to the cleaning montage do changed there we go this thing actually cleaned up a tree it was pretty manky to be honest however all of that all that horrible brown gunk just came straight off with the glass cleaner and then one quick once over with the multi-surface polish has left a nice smooth finish so as i say we'll give this thing a software service it's not going to be a rocket machine it's a old socket pentium you know however it's a completely usable laptop now um so yeah uh thank you very much for watching everyone as always my links are in the description down below for my patreon twitter discord and my instagram and also if you like the video don't forget to hit the like button it tells youtube you like these videos and it helps me out thank you very much i'll see you next time bye you

Channel: Adamant IT

Views: 24,019

Rating: 4.9704723 out of 5

Keywords: adamant it, adamantit, computer, repair, shop, custom, gaming, modding

Id: WSvFCNyr0nw

Length: 25min 47sec (1547 seconds)

Published: Tue Sep 21 2021