The weirdest job ever - Dodgy HP laptop motherboard repair

[@als1035]

Sorin, if you remember, you had 37 ohms on one side of the capacitor. That cleared when you popped the capacitor off. I believe that 37 ohms may have been loading the 19v bus, much like when you installed the properly calibrated fuse. Once you cleared the load/short, you had 19v on the screen connector.

[@johndoes7569]

I was also thinking about this.

[@angles711]

i believe this is the case but the short may have not been pulling enough current to completely stop the motherboard from booting

[@medhatal-moudarres5881]

That's right the blown capacitor makes it as a resistance with a low ohms something like a half or hidden short

[@DanielsGameVault]

Sorin's "proper calibrated fuse" gag is the equivalent of ElectroBoom's "FULL BRIDGE RECTIFIER !" at this point :))))

[@bearfire311]

Sometimes this thing hapens in HP laptop as if you made a reset to main power chip and everything goes up smooth. I think it got fixed as soon as you removed the battery and so on Great job, i like your videos and learn alot

[@JazzEnso]

Hi sorin I suggest this time you need to use schematic or boardview diagram, for better fast and accurate troubleshooting

[@roseaxel4]

19:45 I've been waiting for this for a long, long time. Finally, I heard it PROPER CALIBRATED FUSE!!! )))))

[@carlosgarciaoropeza5480]

It was like the led zeppelin song "dazed and confused"...but it worked. Thank you very much for sharing. All the best.

[@marcellipovsky8222]

Happy birthday Sorin. I know a bit later, but better later then never. Regarding the fault, I had something similar on the bench. The screen backlight came back after I disconnected the screen from the board and connected it back some minutes later. The black magic of electronic components.

[@Knebebelmeyer]

no its the usual voodoo behavior from unpayed bills^^

[@aocaldas]

Hello, Sorin. I’m sorry to say but You didn’t fix the board, You just eliminated the short that was on the 19V power rail. The component that was blown was not a capacitor, it was a coil (I checked that on a perfect LA-C502P board image). The coil number in the board schematics is “LA10” (sometimes, you call those coils as “carbon resistors”, but they are small coils, and you can see the coil number written near the component on the board). There’s still a short in the board after the coil but you isolated the shortened circuit by removing the coil (the blown component) and liberating the 19V to go to the screen conector again. Sorry for my poor English but I think you could understand me. Cheers from Brazil!

[@markkay8117]

Well explained! would be nice to know if customer will get back and say what device in this laptop has stopped working. That blown coil was providing power to something, so there must be a faulty device now, perhaps a sound chip , etc. Schematics is really needed here, to find out exactly.

[@orion310591RS]

29:18 - Hah... worst possible scenario in our industry :D Electrons, little gremlins.

[@laboratorioassembler]

I saw 2 of these. The back-light buttons on keyboard are "reversing" randomly.... making screen completely black at 100% and completely lighted at 0% ... removing battery everything come correct.... but maybe after some days the backlight controls becomes again reversed... check on the web ... on the HP forum there are some users talking about this.

[@zx8401ztv]

Sorin, the fault cleared, it's fixed and the customer will be happy :-D

[@kumarshubham3230]

One of the Best teacher ever I met

[@dmisi1]

you cleaned that burned area, burned mean have some conductivity ,... after you cleaned no more conductivity there ,.... it is it solve the problem ?

[@projects4home]

I replace laptop screens often. The trick is to remove the bezel with flat plastic spatula. Or something like gitar plectrum. Mostly the bottom side is attached with some glue. Needs to be cut with a fine metal spatula.

[@mikanikolic1976]

23:30 Epic!!😂

[@fecokaid.h.6365]

Happy birthday Sorin.😁

[@rfr653]

Good job mate 👍

[@lordmmx1303]

that plus in the middle. well, that's HP in its infinite wisdom. There was a movie called Pirates of the Silicon Valley, which had scene where Woz showed his computer to some leader in HP. and he asked Woz, what would ordinary person do with computer.

[@hpphil-x3l]

the problem was the cap witch was shorted and most of the same faults when you remove and clean the board the short is gone[and it works perfectly without the cap] nice work[easy one]

[@balazsio]

HP is working in a mysterious ways

[@wackey2k10]

yup, taking front screen bezel can break the screen because it's happened to me. idk wtf they glued the screen so much for.

[@Erabada]

its good to see you ❤❤❤❤

[@idelintodorov3022]

Most probably you have a ground layer under the exploded component. When you soldered the wire you created a short between the main power rail to the ground layer below it.

[@racztamas1980]

I also think this was the case. I've seen this in many cases, when customer says: There was a small smoke, but the laptop has no problem a few month ago.

[@screen-protector]

I've got the same level of jobs, I'm use to it, only not always have time for them. I hate when I fix one thing, and either something else is wrong, or with no reason something started working. I can't take a credit for fixing even :D.

[@linuxxr]

to avoid your head from swelling== you are great!!

[@emanfarre5050]

happens to us all the time sometime we just need to remove the battery and backlight works

[@xx3868]

Sometimes when you somehow fix something, there IS a issue, just enough to bump it and be thankful its working again is all you can hope sometimes. You can test it for a hour moving and bumping and if all good, Perhaps clean all connectors and check alignment ect and wires. Once had a early ipad with a LCD that only came on now and then, so unglued the touch and just that alone without anything else disturbed something and i couldnt get it to go off again!! I then cleaned all the connectors and checked all and plugged in and out in case of corrosion but 100%. Must have been very very small connector issue just enough to kill the screen and even tapping it before opening make no diff which is why i had to open her.

[@morrismp]

Sorin - The master of disasters ! 🤣🤣

[@ruimvp]

I think I would not have the courage to short two tracks were was a component that I did not have a clue of what it was.

[@leetucker9938]

Sorin has the hands of Jesus , he touch laptop and it works

[@bouxesas2046]

Sorin you didn't understand what happened. When you soldered the proper calibrated fuse, what it did was to calibrate the whole board and fix the issue.

[@tomicekgrundicek5131]

Now go and check audio if working. I had almost same on asus zenbook. Audio stopped working because i removed cap and didn't replaced.

[@anxiy]

Most of the times on laptops, removinng battery + cmos battery helps fixing alot of issues like pc not booting bsod, etc

[@paulrockwell2644]

this teacher no how make most people under stand realy how fix pc] whatch as many his shows i can Sorin good teacher Ithink

[@wisher21uk]

What a weird fault maybe where the board was burnt is was arching out, great fix though well done

[@mm0077]

This is electronic mystical fault, which can be beyond imagination and no logical explanation as you said but they do work once you probed around. I have had a few repairs like that. The mystery continues and somehow there is an explanation somewhere but because we did not find the root cause we cannot explain.😂

[@etw.leonelle]

I resolved this issue many times by disconnecting and reconnecting the LVDS cable of the screen, and in some cases the issue raises again, don't know why only in HP gadgets

[@i.respawn3545]

Its a common fault on those motherboard to see that component blown up. Just take a look on google, they are even selling (working) motherboards with the exact issue.

[@sabsab692008]

when u checked for ground on that blown cap the first time u didn't find it .there was no ground but some ohms, which means there was a short cap there somehow .

[@bearfire311]

That blown capacitor is a company extra😅

[@dmisi1]

everything must have one reasonable explonation , but when we have a good result we dont care to take a lot of time to get that explonation...

[@stephenhall3515]

HP stands for "horrible products". Even their most expensive laptops made about 8 years ago used dangerous power inputs but their real masterstroke was to use capacitors in line, usually 4 when 2 good quality ones would suffice. HP's were cheap ones and often popped and this could blow carbon [conductive] fragments to other places. After thorough cleaning and using re-set, usually by removing the BIOS battery for a couple of hours, normality could be restored. That is to say HP's shoddy version of 'normality'. Part of my work was to recommend devices to government acquisition departments here in the UK and as the faults were so common the result was very few HP laptops being seen in British schools. Strangely, far older HP laptops could be upgraded using SSDs new RAM and occasional CPUs to work to modern speeds and acceptable efficiency.

[@andytipping70]

could the exploded capacitor have broken the ground track and by applying the soldering iron , you rejoined the ground track? (would explain the no ground situation to then recovered ground situation?)

[@markwojo727]

It happens to the best of us .

[@gyorgyszabolcs7313]

Now I'm OK....Now I know that not only me find jobs what was fixed trough magic...I had some this like repairs , about not even now don't know what was the problem , but they are vorking...

[@lovejoymakhaza5229]

Hi master Sorin, nice to see you again. I have a problem with my acer aspire 1 its not turning on but the 19v is open. I put my my multimeter on beeping mode and put on pin number 8 of the BIOS cheap and it beeping but on the first pin its not beeping and on the coil after the 3.3v power supply. how can i solve that issue

[@jache2k201]

with voodoo magic

[@jasonlarnach6770]

Could the carbon from the burnt cap be shorting under more load?

[@Hejazi1365]

Is your screwdriver a torque screwdriver?

[@sniper5406]

27:23 lol Sorin is going crazy right now lol, IF it was me and see the back light come back i will close the laptop and call the customer, i will not try to understand or wanna understand wtf is going on, i fix it (god knows how) and i don't care how lol

[@saileshkushwaha5594]

Nice sir

[@dannechita8577]

the explosion of an capacitor cannot create a carbon bridge to short it?

[@benaumark]

la fumée noire sur la carte mere cree le court circuit

[@boomer9900]

I avoid laptops from HP. Over my time I have had over 20 laptops, with just one HP. They all still work and the HP has been repaired 3 times and it now has a bad graphic chip solder ball crack again. I think they make junk.

[@Drottninggatan2017]

How old is that HP? Up until around 2013 they made some really solid laptops. An 8760w will not fail, other than the software.

[@alexyo5402]

What brand do you recommend? 4yrs ago I got my first laptop, an ASUS, it "died" after 2.5 yrs so it was a really bad investment. I'm considering an Acer A517-53g but the display is not that great as the old one.

[@MercyObizuyo-mt8pd]

HP-Horrible Products 😂

[@jaym5938]

So no test of the brightness/dimmer buttons? Perhaps the backlight was merely dimmed, turned off. The board reset and the backlight came back on.

[@DarkGT]

Not sure you can get a backlight that low.

[@jaym5938]

@@DarkGT Why not? Is that specific to that model laptop? My Macbook backlight goes completely off.

[@DarkGT]

@@jaym5938 Doesn't sound like normal behavior during boot. I can be wrong.

[@jaym5938]

@@DarkGT Sure. Could be software or hardware that got it 'stuck'. But it came back on by itself - with some help from reflowing that chip. Maybe a bad connection... *shrug* :)

[@laboratorioassembler]

Happened 2 times to me... back-light controls on board become " reversed " and at 100% the screen vecome dark.. ( no backlight) lowering with buttons the screen becomes lighted.... removing battery everything become correct for a while ( some days)

[@bahadoromid3554]

its should pcb line cut . you restore pcb line again .

[@WeFixTvs]

Owsome job

[@ivanlovric4772]

Hey, I have a question for you. My bios won't recognize my bootable flash drive in bios and I can't seem to find the reason why. Can you please help me because I'm outta options? Thanks. My machine is Toshiba satellite A300 1G5

[@jache2k201]

rly HEY? respect first

[@Ryokath]

First : - What Operating System do you have installed on the USB? And what software did you use to make it bootable? - Have you made any BIOS changes on the Toshiba Laptop? Check if that works : 1. Once in BIOS, select Security and make sure Secure Boot is disabled. 2. Next, select the Advanced tab -> System Configuration -> make sure boot mode is set to CSM Boot. 3. Press F10 and Save & Exit. 4. Press F12 when you see the Toshiba logo and you should be able to boot into your USB drive. If you still don't see your USB key, it may be that you made your USB bootable drive the wrong way or there's something else. If you try to install Windows 11, you'll need Secure boot and TPM 2.0 enabled in your BIOS.

[@laerticomputers]

👍

[@matrixclone1403]

Do you ever ask yourself why did that fuse blow in the first place before replacing with a wire?

[@electronicsrepairschool]

No fun in that, i learned from TV repairs, first replace the fuse then you pray, is doesn't blow up, it's working :D

[@matrixclone1403]

Sorin, I can't believe you call this a repair, at best it's intermittent and the screen will go off again. What do you think your customer would say if he sees this video? Dodgy Job!

[@mikanikolic1976]

the laptop was fixed, it was fun for us to watch. Everyone is satisfied!

[@Customer22374rt]

how can you fix it ? the laptop fixed by resetting the power and removing battery . you just over reacting that's all . there's nothing in the board not working to assume there's a fault somewhere . what do you want Sorin to do ? explain ?

[@eugene6549]

​@@Customer22374rt replace capacitor, no shltty cord

[@dannechita8577]

HP is most lowest company. i will never buy hp anymore

[@Nightowl_IT]

The first step in every repair is to try to find the service manual or a tear down and schematics.

[@eugene6549]

Never

[@OnStageLighting]

Meanwhile, back in the real world.... 🙂

[@carlosgarciaoropeza5480]

My browser only shows two pages but still I searched for the free schematic diagram for that motherboard (la-c502p to no avail). All the best.

[@johndoes7569]

Cand ai zis ca mi-ai citit mintea, m-am speriat putin. Da, acel capacitator nu avea cum sa faca scurt, insa poate scurtul facut de tine a fortat voltajul pe display.