Hp, dead, no power - the most stupid fault and design
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- Опубліковано 29 лип 2019
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Really honest person,trying to explain what’s going on , after finding already problems. Thankful
like MOSFETs, Zener diod is almost certainly part of the charging chip design template. Most of the manufacturers implement reference design instead of inventing their own weel. The problem with input voltage protection is that both MOSFETs could be shorted by voltage spike of a malfunctioning power supply. If it builds up a high-frequency AC ripple, it may be overseen by ACDET regulator but it will still blow insulator in MOSFET. in this case, you have uncontrolled DCIN going directly into the main power rail which is always a bad situation. Zener diodes are used on every single HDD as an over-voltage protection fuse - it gets blown very fast and it shorts power rail to the ground. Think of Zener diodes as an over-Voltage fuse.
Since you did not replace the Zener and customer will use the same PSU, this laptop might come back at some point and I guess if it will, it will come with a blown cap or VCORE MosFET.
Happy return teacher, your classes are greatly missed; thanks for the experience and tips, greetings from South America.
The best teacher I have ever seen.
I have repaired my HP Pavilion 15-n225sf , i can't believe this, you are... a master, and i'm as far to be skiled as you are, Thanks thousand times.
It's not zenner diode, it's reverse polarity protection. See it's pd9, not pz9 and the symbol shows a diode. That's why it is there for reason and not stupid.
"Now I'm angry" ..the way you said it... Loved it! Very educative as well.
I like your way in analyzing and solving each case you come up to, i am addicted to your videos, a week without them OMG
That part you were pointing out is actually a TVS diode (transient voltage suppressor) marked as "IV". You can look at it's specifications under it's equivalent being SMAJ20A tvs diode. It was a bit tricky finding it as either new semiconductor devices do not have a standardized marking code or, that (somewhat imperialistic) companies have their own marking code which at times do not even correspond to their own data books.
Now if these diodes are shorting to ground on over voltage then why would it not work correctly again when the over voltage is gone?
I suppose that this diode was damaged. Permanently shorting to ground.
Not stupid if they want the laptop to "break" easily...
Now that's not the answer were looking for
That stupid zenner diode allows you to have a client =) your videos are fantastic, thanks for sharing your knowledge!!!
Great stuff. I have just bingewatched about 4 hours back-to-back. Thanks.
amazing talent you have sir.....I do repair things, but a laptop on this level is something I always wished....
In my PSU designs I use suppressor diodes to protect from spikes, when they fail, fail short and burn out the fuse, so the rest of the board is safe and doesn't stress the charger or whatewer the power source. HP really should put some kind of fuse to the power rails.
EDIT: if something goes wrong with the charger or wrong charger plugged in tantalium capacitors blow up pretty agressively. My guess they use max 25V components.
Thank you for being such a good teacher!
You chose the HP because the color matched your shirt.
Thanks for today's lesson.
i said the same think before reading your comment i swear hhhhhhhh
That made me laugh. I had to blink twice 🤣
Weirdly enough it's how people buy HP's
Bloody cheap.
I love all your videos.. I truly admire your generosity in sharing your valuable experience and knowledge.
Bless you!
Long time no see Master. I've missed you.
Subbed and Thumbs up! Thank you so much for this! I was a repair engineer _Once_ and I still like to think that I can tackle most things but I was presented one of these in a very similar scenario, with the exception that the charging light comes on and it will charge the battery but when the power button is pressed, lights (but no screen) come on briefly; fan spins briefly then everything goes quiet, leaving only the charge light on. PSU is fine but *not* original. One of my excuses to not attempt something like this is that I don't have a Scope or re-ball facilities but you prove the contrary, using tried and tested basic equipment to repair things that would otherwise be 'beyond economical repair' by smaller companies and astronomically high priced repairs from manufacturers.
Did you fix it sir?? I have the same problem
Loved this one. thx so much for teaching me
Wonderful, I love your videos man, so much to learn from, thanks a million.
wow... you really cant understand how much you've been a source of inspiration to me. thanks Sir... i really appreciate this
25:46 where fun part starts :)
This stupid I swear I get angry
'This is moral thing'
Well explained.
Thanks Sorin
Great video.I agree with your reasoning on the protection diode,which does not really protect but kills your laptop.
Always love your teachings Sir..thanks you come back...yes i believe hp got a problem as i experienced
keep sharing sir ..this a big help to all beginner like me ..to become someday like you sir
Did the guy with the computer give you the shirt too?😂😂
Love your stuff man.
A very very good explanation, you're the man Sorin !
Your all videos are full of information
Thank you sir
Love you
HP designer and his manager disliked the video!
The truth hurts. Sometimes when the baby is ugly you have to call it ugly. You cant fix what you don;t know, or accept in this case, is a broke system. FIX IT HP! ;) lol!
Excellent work!! Love your lessons.
Hope you had a nice holiday Sorin, I was wondering where you was, I missed your videos big man 👍🏻
Welcome back ,nice to see you again.
Thank you Sír you are a great human being for share all of this. I wish I have the 5 dólares to joining your school.
Thank you Sorin, I imagined the fault before you show it just because I saw your other videos before ...
You're a master in the Power fault !!!
31:05 haha what is that someone put coin in USB port ? :O will that make laptop dead ? Respect! i learned so much from you and every day learning working with laptops 20 years and still every day I learn something new from you ! God bless you!
He kinda looks like a grandpa teaching his grandchild with so much care and devotion. 💓💓💓
Love the way you teach troubleshooting.
Welcome back Sorin we miss you
Thank you for the nice video
happy to see you Sorin :)
we missed you
Very good your point of view HP notebooks, Excellent contribution to knowledge
Good job Mr. i m learning a lot
This is a nice one, thanks for nice diagnosis. I am being inspired.
now I am going to look for zener fusible diodes right beside a capacitor....ACER ASPIRE 5333 water came out from ceiling it got poured and now hard to think more possible solutions. Thank you for sharing another idea!
Thank you so much for today lesson!
Wonderful, I like your enthusiasm
Am grateful for your videos it teaches me new methods
It may be a Transil diode called also TVS (Transient Voltage Supressor). It is used to protect against overvoltage. It shorted itself but protected rest of the components. In some cases transil can even protect against catching fire or explosion of Lithium-ion batteries.
Yes, it may have been a TVS diode doing its protection job correctly. That TVS may have been under-rated, or else a massive voltage spike appeared on the line.
Thinking maybe the PSU failed and sent a voltage surge to the laptop?
i have a limited electronic education but you explain so good i can understand .
You are the BEST Sir, it was same on my laptop, GREAT...!!! HP ab203TU ... I solved it looking your lesson.. Thanks again..
Thank you sir! I learned a lot from you.
very helpful to our friends ,, all of you are very kind
Great work Sorin, thank you
Sorin, they got you back just to fix all the unfixable ones. Admit it!
I so much love the way you teach... I wish I could be your student.
You kind of already are if you're watching his videos. ;)
Can I have your number
i missed you man, the guy from South Africa.
I should call you "Master"! It really helped me a lot. thx!
God bless you for today’s lesson ❤️🙌🏽
happy to see you again !
thank you for New video sir.. Miss you
very clear sir! and thank you for the lesson yeah!
Welcome back! Wanted to ask, can you show how to diagnose if a hub is dead? Thank you!
very cool technician you are ,following since TOGO
wow, best ever video on repairs you are truly a genuis🎉
started more liking for your lessons and a style of teaching too. very informative. Thanks
If the Zener diode wasn't there you would have a much larger repair job. Yea the Zener killed the laptop but it prevented damage elsewhere. The zener diode is probably there to meet some safety agency requirement.
There are supressors or MOVs which are designed especially for surge protection. Zener diodes are not really suitable for the task. Not in this power range. On a low power rail maybe, or on an I/O line, it is.
@@matrofixWhat did I say that was disrespectful? Just stating what I felt was a reason for the diode to be there.
Sorin, your shirt matches the laptop!
It’s a great repair again
And indeed the blue case is matching
felicidades maestro y gracias por la leccion. see you next one thanks
Helpful video 👍
Hp doesn`t manufacture this board.It is not their fault.It depend from manufacture like Compal Quanta Inventec Clevo....They also manufacture for other brand,they put their design.Every manufacture has they design and for example Compal make board for hp lenovo and dell...Only except samsung and sony make they own.Same thing with bios Hp doesnt make them it make other company like phoenix....Sorry for my bad english.Greetings from Bosnia.
Interesting. thks for the info.
Amazingly intelligent man
I wish i was half as smart as you Sorin. Your videos brighten up my day!
That's great for HP, many people will just buy a new one, other try a repair and will not succeed, so at HP they think they will sell another laptop ..... what they forget is that many will not buy another HP and go to other brand...!!! Great video.
you have to come together with Louis Rossman :)
nice work sir I learn something in this video
capo total la manera de explicar es sensacional soy de argentina y entiendo mas con vos que con los de mi propios idiomas
Very good video Sir. This is what is meant by "Inbuilt Obsolescence". These are crafty marketiers doing this on purpose so people will have to keep buying their products. And you are correct. They are not very intelligent humans,.. because they will alert people to not buy HP products. I had bought a HP Prodesk 600 G3 & 13 months after buying, the power supply shorted! First time a power supply shorted with me. When I checked the price of the replacement power supply, Canadian $99.00 + 13% tax!!
Learning a lot from you . Thank You
I think its a TVS diode. A transient voltage suppression diode. It will short if the voltage reach its limit and does not recover from short anymore. I found one in a Western Digital Hard drive and its the same problem, the area where it was located we're charred/burnt.
correct...
TVS diodes commonly go on the ends of circuits and not between FETs. It’s more likely to be a zener diode.
@@lelmus3277 Zener diodes don't want to be in the main power bus, they are usually placed on the base/gate of a BJT or FET if I recall
@@lelmus3277 According to the circuit diag. the part number is P4SMAJ20A so we may have to agree to differ on this one .. Keep up the good work .
John Price please recall that I did say it’s common practice. Inline TVS between FETs is plainly confusing to me logically. I place transient suppression only on connections where hands touch or near and between power supplies to the logic circuits, to protect against ESD. I must be doing something right since my designs do pass UL.
I Recived this laptop on my shop same day this video was Published, and you know what? Same problem, i think i owe at least a Coffee to Sorin! :D THanks!
lol, no way!
That diode was put in place on purpose for planed obsolescence
thanks mr sorin,you're my teacher.
i get a lot money from your videos
Hello thanks for sharing your experience.
After you remove the zenner diode you had to put a bridge wire at it place right?
you are simple to follow keep up the good work
Thank you for the lessons
Fascinating! Thank you! As an application software support programmer, I find similar stupid things that programmers do in their programs. At least half or more of the programmers have no business writing programs. 90% of programs are terribly unstructured, disorderly, and inefficient. 10% of them are quite elegant and are a pleasure to read and follow along. The "logic" in circuitry is very similar to the "logic" in software, and most of the time, there are problems with insufficient testing and a lack of consideration for the end user's perspective.
What a legendary master
Only for PC experts this. My problem with a new HP laptop that wouldn't turn on was unplugging power , press power button for 30 seconds.
thanks for giving me an idea
Excellent, compulsive viewing ! The TV is dead !!! Great entertaining show !!
First time i've seen a TVS diode present on these boards. I take it, the TVS diode got a large surge and just completely broke and went short, hence why there is a short between those two MOSFETS.
Sorin I wanna know something. Now whoever is sending you those laptops to you for reapirs, ( you said its from another shop) are those people or that guy not watching your videos and learning to troubleshoot? Get my point? By the way thanks so much once again. Love. Good luck. 😊 You are a man of 'heart'.
You are the best man love your'e video's I learn so much from you thanks man
You are amazing man Thanks for o lot of hints and I recovered a HP Laptop coz of you.
Your a flipping credit to watch. Unreal. Good luck and health to ye. Lorcan here in Ireland
Awesome channel. Godbless you sir.
you inspire me and i think your job is pretty cool i have a similar problem but the super I/O (ITE chip) is getting hot and i dont have a voltage measure device
Im not a big tech, but i think this stupid diod actualy protected the board, cos the diod died and other part didnt get damaged. Its easier to change/remove the diod than, for example, bios chip, which potentialy could be damaged if power supply fails in some way. if you get what i mean
the best sorin all over the world, thx too much 🌹🌹