apparently, the plastic cover is not just as a water damage protection, but also as a heat source pointer so we don't have to spend much time to hunt it with voltage injection. awesome repair Adam. ;)

Spot on repair work. I really enjoy your videos, thanks for sharing your knowledge with the world.

Sometimes those diodes are not your standard schottky or generic type. Often companies will incorporate a TVS style diode that is designed to function as a standard diode in reverse bias mode, and will clamp (short) when over voltage is detected. In most cases these will clamp without a catastrophic fail and will generally fault a secondary internal circuit protection portion of the board that only a person with some electronics knowledge and a soldering iron can fix. I call TVS diodes a "Warranty buster"

You help me so much with improving my English! "hecking chonkers" will see regular use for sure!

05:11 Your reaction was so nice :) By the way your videos are so helpful. Thank you !

I don't think this is reversed polarity diode. If the second pad is going to the power input pins of secondary power rails then it is and it wouldn't burn when you plug reversed charger it will just not let current flow the opposite way. If it is going to the negative plane then it is a TVS diode that protects from dc voltage spikes. TVS diodes have the following two main properties: 1) Clamping voltage window - usually starting a few volts above the rated voltage of the charger and a max clamping voltage which has to be lower than the max operating voltage of the buck converters feeding off of the main power rail. When they start conducting the excess power to ground they can only do that up to (2) 2) Max conducting power rating at max clamping voltage (usually 200w,400w,600w or 1000w) You can install a few lower power rated diodes in parallel but exact same model or a higher power rated one to prevent them from burning. They should be installed after a reversed polarity diode so they don't burn from reversed chargers. It is possible that some laptop manufacturers don't install a rp diode and count on the tvs one to fail short. If they fail open on reverse polarity - Bye bye motherboard.

5:04 ‼ when this happened. I heard the Metal Gear Solid sound effect in my head.

So glad I found your channel. Lots of how to videos but very few go through the thought process and more importantly know how to convey the knowledge through the camera. QUICK QUESTION: How do you keep track of where the screws come out as some screws are different lengths etc and also do you keep track of what connector goes where before you disconnect. Thanks!

special thank you

Hey there, I recently started watching your videos and I guess it will be my side hobby thanks to you 🫡. Btw @6:41 you should have removed the charger first and then attached the keyboard. You just got lucky not to get failed keyboard 😅

Great Fix

Have two of these boards stashed away somewhere. 😲 time to dig them up and check those diodes...

Don't shock 😅✌️✌️✌️nice one to you sir more videos 😉

reversed protection diode is for the universal laptop chargers that are out there that are not keyed for centred positive plugs

Does that oscillating voltage cause the DC - in jack to get hot as well? Thank you 🤓 I realize you didn't really go over the laptop info, but can (could) the CPU be upgraded? Thank you again

Hello, is it possible to change processor?

how about changing 100% but Plug Out Charge laptop die, Dynabook r732/g, it's battery or board Sir ?

Reverse voltage on newer laptops might be for safety regulations for some countries

How many people jumped when the plastic went back into place? "me"

You can never have too much flux.

Hi do you repair motherboards?

Hey Adam, Thank you very much, i had a great luck, i have the same model with the same problem which is evident, but i don't have nor i knwo where to find a reverse voltage diode that matches the laptop. where can i find one? thank you very much

why not a full brige rectifier to fix this?

I am having same laptop I am getting short of capacitor in the backend of cpu and in other parts of the motherboard also when applying current the ic is getting extremely hot 🥵 my laptop not powering and no led I need help

5:10 that has happened to me. same exact reaction lol

Why fit it? Maybe to make laptops break. Or me being too cynical?

5:08 i got socked too 😂

How can someone apply reverse polarity with a charger?? Not the toshiba charger?

WHERE CAN I BUY THIS REVERSE POLARITY DIOD FOR ** TOSHIBA SATELLITE 55D-C ** if someone can help me please? Thanks!

That was more like 2 micropauls of flux if you ask me

Highlight of the show was when the plastic cover snapped back! Apologies for giggling!

Use Flux to desolder easy peasy.

I got scared 5:10

I know i'm a bit late with this comment but some chargers do have reverse polarity maybe someone plugged and over volted or amped one into it .guitar foot pedals are often negative on the center pin but only 9-12 V DC but other appliances are some times the same (reversed polarity) if the plug fits could have happened. Or a dodgy made in china piece of crap charger.

I think the manufacture know all third party charger in this world is a crap. I have seen the charger come with positive outside with same DC jack and same volt, but not for all laptop. It design to specific laptop or devices.

You should get thermal camera

You are incorrect in the function and nature of that diode. It is not a standard rectifier diode, it is a zener diode which is a form of voltage regulator. It is connected across the input BACKWARDS from a regular diode so that if the voltage goes above, say 20vdc, it will flow current to ground to prevent an overvoltage from reaching the system. I repeat IT IS NOT A STANDARD DIODE.