Watching your LFC videos makes me feel I can fix any motherboard! Thank you Adamant IT

Much Respect, your channel has been my goto learning channel during lockdown, every day I learn something that I may never need but am sure that my knowledge base is improving daily. Many thanks and respect!

Perseverance is a gift, patience a virtue, knowledge needs to be balanced and practicality is the sensible option to perfection at any cost.

Bang on matey, 5520 ... same cap had blow 👍 You are a star

Man,I just learn a looot from you...showing us your thought process really makes the learning process so easy..Many tech channels teaches short detection through bench power supplies,there is limited information on finding shorts with normal pcs,ive also leqrnt how to navigate the pcs schatics,unlike macbook schematics,these normal laptops be having crazy looking schatics.live long man.

Thanks for the video. Just repaired an Inspiron 7520, turned out short curcuit in the same capacitor you found in this video. In my case, also PQ101 died.

I love your videos. If you don't have an ESR meter I'd recommend one. It makes identifying bad caps easier and can be used while in circuit.

Amazing work he does.

Young Graham is a brilliant troubleshooter, no voltage injection and no thermal camera, he found the problem area and more; He showed that the criticism of his welding technique is completely unfounded. Excellent repair, sincere congratulations, thank you very much for sharing, I did NOT see the scale thumbs up x one Mega (I would have chosen it). A brotherly greeting from Mexico.

Capacitor resistance should be theoretically infinite with DC. When you measure capacitor in circuit, you are also measuring everything around it too which results in low resistance measurement.

U r doing amazing job ,dear

Very impressive!

Great video, thanks for sharing.

even i have same problem i have replaced same capacitor and fixed the problem thank you

amazing work : -)

You helped me in the First Minute !

Am doing medicine bt i still like this stuff

This is the most WELL DONE TUTORIAL i've seen to explain to resolve to find with a schematic a complicated short!! Many many thanks for share your experince! I need to see twice o tree time this video.. (not very good English) for memorize this technic.. thanks a lot (only 453 like.. it's insane! this tutorial is pure gold, perhaps no one has understood it)

Thanks, I succes to repair my lap. Greetings!.

Entertaining as always. Thanks!

Very well ....isolated each section and found the fault however an easier method would have been to use a dc power supply and find the short but the good part is if we use that method learning would not have been so well....thanks a lot... really appreciate your work

@down2earth485

3 жыл бұрын

Agree, I would have voltage injected and found the shorted cap. once thats gone it probably would have also heated the mosfet on the over-current side as well letting me know that is also dead... removing the 'partial fix' too

@jmdb1414

2 жыл бұрын

Keep in mind that this was a very weak partial short @ 2K ohms. It would have taken insane voltage to get something to heat up. Voltage injection was not an option I think.

process of elimination, very nice

No surprise that VIN goes pretty much everywhere.

great job, congratulations!!

Thanks so mutch mate.For me was so easy to remove this little bastard.My laptop working fine now.May be this faults is avalible to all of this model.Great job

Thank you so much mate much appreciate your video, as my identical laptop today just turned off same thing with power supply light turns off when plugged in, I’ve took it apart twice and also seen that same mother board on eBay from China and am the same as you it’s just not worth it but I will take the same part off it get it going and give it to my son to learn thanks again 👍

so 3 year old video. But first time for me. Learnt a lot from watching. One important question for me is: why not try voltage injection from the get go? Edit: ok, just saw answer above.)

thanks for video . good luck :) thanks to your worked laptop ,Greetings from turkey bro

Thanks...🙏😁

I have a strange problem with a Dell Latitude e6420. When you plug it in the charger light go's out and it wont start, if you remove the battery it works fine. I ordered a new battery and same problem I checked the output to the battery and its 19 to 20 volts dc to the battery. But the laptop works perfect without a battery installed. Any idea? I'm asking because I've seen you work on quite a few laptops with similar problems accept the battery issue. Any hints would be greatly appreciated.

Hello. I had the same problem in my Inspiron 7520, I 've followed you steps and my laptop had exactly the same capacitor in short. I've replaced it, put a new one. The computer turned on again. The only problem it has is that if I let the power charger conected when the computer is turned off, the power charger LED turns on and of every couple seconds. If turn on the computer, the LED keeps on and no blinking. Even when I remove the battery, the sintoms stays the same. Does somebody have any ideia what could be the cause of this problem?

May I have a video for dell lattitude 3400, its glowing amber light when i press the power key

mate, you made my day. it works! partially or not :) thanks a lot.

How short to ground jumping over healthy pr102 resistence?

I have one of those laptop, but is turning on end off after 3 seconds. Don't find any information about that on internet

at 23:33 you tested capacitors without removing them, will not that give incorrect reading on the multimeter?

@Adamant_IT

3 жыл бұрын

Sort of, I was testing resistance to ground, which you can do in-circuit. However, checking all of them was a waste of time because they were in parallel, so all joined together. If I were trying to measure capacitance, I'd definitely get a false reading. This video was one of my early board repair efforts, so I was still figuring out the basics.

Have u ever done a kindle fire because I have

Love the way you explain things. Do you have a 'go to' site for all your schematics Graham? I'm looking for one for a kindle fire but can find nothing

@georgekaramolegos5345

6 жыл бұрын

Adamant IT Can you name some of those sites,please? Also can you tell me the temperature you are using on the hot air station? Love your videos .

I have same laptop but .i have broken the power soldering notch pin

i have one toshiba a210 wich is turn on 1 sec, ven i put the baterie on the laptop or i put the charger with out the baterie . the laptop work fine . i ask wai is turn on 1 sec. wich is the problem . I hope an anser .

Why don't you use the Bench power supply to detect the short

Was a there a reason to follow the circuit this time vs injecting power and chasing heat?

@Adamant_IT

4 жыл бұрын

At the time of this video I hadn't learned voltage injection. Or rather, I was aware that it existed, but wasn't brave enough to attempt it. All things considered I got really lucky that the short just happened to be in the battery charger circuit - although it is a known failure point in Dell laptops of this era. If I did this repair tomorrow, I'd voltage inject - but as with my new videos, I always start by looking at the board and understanding the layout first. It's a lot like maths, learn how to work it out on paper first, and then you can use a calculator to speed things up.

@surgingcircuits6955

4 жыл бұрын

@@Adamant_IT Excellent. A very good and truthful reply. TY. Makes sense. Was helpful to see you diagnose it this way (a bit more traditional) as well as watching more recent videos showing another method. As in most fields, it's good to have more than one strategy to problem-solving in your bag of approaches. Guessing that you may have gone back to a few boards that previously kept their secrets hidden, and with another approach, revealed their woes later. I have seen vids promote using FLIR devices to locate "heated and cranky" components. It seems like these FLIR devices have held their high price tags (maybe too long); keeping many away. Fresh good stuff. I have not seen many using v-injection. Especially intrigued when seeing you track a path that goes through a portion of an IC. Thanks for your efforts.

Do you ever play Ant Music?

From which websites we can get schematics of laptops?

@bennaambo2716

3 жыл бұрын

just type in google your motherboard name and add shematics. or use your laptop model followed by shematics

Hi sir . Dell Inspiron 7520 My problem is 4409 mosfet short I find this mosfet this mosfet is not available in my city . 4409 mosfet replace in any other mosfet Please help me sir

Where are you getting your schematics?

@Adamant_IT

4 жыл бұрын

If you google search the model number of the mobo, there's quite a few forums out there that share schematics for free as long as you sign up for a free forum account. Google the model of the mobo and it'll turn up a thread from one of those forums. It's hit and miss, I recommend checking some of the newer videos in my Board Repair Basics playlist to see how you can find shorts without schematics as well.

i will never use norther ezp20xx spi eeprom programmer ever again, it has bricked 2 of the same motherboards it corrupts the bios and now i have 2 dead asus g751jy boards which turn on and turn off because the chipset flares up to over 100c and shuts off there is no short to ground anywhere on the board, and the second time it happed i kept the chipset from hitting 80c using a flir imager, so with tht said now i have to wait and get a TL866II to try to repair the bios, if not ill have to order a pre programmed bios

Please can you make a video on batter charging section in details

@Adamant_IT

4 жыл бұрын

I've got something in the works for that 👌

@mitechconcepts6538

4 жыл бұрын

@@Adamant_IT how do I access the video. I really need to understand the communication link between the charging IC, battery and the EC/KBC/IO during charging. I need to know the conditions for the charging IC to initiate a charging process

@mitechconcepts6538

4 жыл бұрын

For instance, I have a laptop for repair here. It was a water damage but the battery charging and discharging section seems dead. When the adapter is plugged in, the system won't power on unless the battery is removed and it will short the charging and discharging MOSFET during the process. I need help to fix this prob

@Adamant_IT

4 жыл бұрын

I'm not sure how much I'll be able to help with your specific issue... all I know is that there's a job in my queue that involves a laptop with a damaged charging circuit

@mitechconcepts6538

4 жыл бұрын

@@Adamant_IT thanks a lot. I will wait to see you thrash that out. God bless

Repair Charges ?

These Dell Inspirons are complete garbage. I had a 5521, sat on the desk for about a year and 3 months, never been abused. First the trackpad started acting up, then the keyboard quit, then I had an issue with the back-lighting, bought a new display, then something like this happened, charger light went out when plugged in. I ended up parting it out, and now I have Lenovo Thinkpad laptop, been the best system, and I only paid a hundred us dollars for it. Never again a Dell Inspiron laptop, made in china and junk.

I want to work with you broo 😕