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

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.

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.

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.

@@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.

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 .

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

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've got something in the works for that 👌

@@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

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

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

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