HP EliteBook 840 turns on then off no display. (Chip level motherboard Repair.)

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Laptop powers on then off with no display is a very common issue, especially in HP laptops, I have been receiving many 840s G1, that's why I made this video to demonstrate to you how to fix it.
This issue happens mostly due to missing 1.05V chipset voltage, in worst cases it happens due to a short circuit chipset where it becomes quite hard to fix, this issue is not caused by Bios as others say.
In this video I use a digital multimeter to diagnose a faulty chipset power supply chip (TPS 51362) by comparing voltage readings from the schematics, then I proceed to diagnose a fault power sequence chip (op amp lmv393v) that is not giving out power good signals (PWR_GOOD_3). Then I replaced both fault ICs using a soldering rework station (Brower).
If you a having this issue, follow the video you will successfully be able to fix it.
How to download laptop schematics. • How to download laptop...
If you enjoy this video, give it a thumbs up, if you have any questions put them in the comments below or write me by email, and don't forget to share and subscribe so that you can be notified when I upload more videos in the future

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Опубликовано:

9 ноя 2021

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Комментарии : 97

@daniekotze6148 7 месяцев назад

Love the way this teacher explains with patience and has a backstory on the hp. Great fix

@LiamB1708 2 года назад

New subscriber from the UK. Your videos are very knowledgeable, thanks for sharing.

@platinumphonesandcomputers 2 года назад

Thank you

@sakisgri2165 Год назад

Good job, very nice explanation. Thank you

@platinumphonesandcomputers Год назад

You are welcome!

@mand6029 Год назад

many thanks to you , i got the solution from you

@manimarancreator Год назад

NICE EXPLANATION THANK YOU

@sshaikh3878 10 месяцев назад

Mind blowing!

@hitmanyt2021 Год назад

Grt job new subscriber from Pakistan working in same field bro❤

@ziasurrani996 Год назад

Hi. Ap kaha kam karty ho. Mery laptop me ye masla hai

@ewoukemngnia2568 2 года назад

good video, thanks for the knowlegde...

@platinumphonesandcomputers 2 года назад

Thank you

@chandamark7301 2 месяца назад

Good job

@generalndlovu3639 2 года назад

best explanation

@platinumphonesandcomputers 2 года назад

Thanks you

@user-vu1nv4qb9o 9 месяцев назад

@platinumphonesandcomputers Hi, I'm curious... Do u have any idea why SPI chip may get erased except aborted bios update process? I am fixing Dell Optiplex which has the same symptom and I noticed that SPI chip is erased, istead a bios firmware, it had reppeating itself string of bytes... What do you think, is that possible that it could get erased by shorted 3V3alw and 1.05V supply rail, because I had also shorted LDO for 3v3alw and mosfet in 1.05 supply rail...

@nworaanyika8863 9 дней назад

Great job.👏 Would love to learn how to read and understand motherboard schematics

@platinumphonesandcomputers 9 дней назад

Thank you, You can checkout this course that goes into detail of schematics reading and repair. www.udemy.com/course/laptop-repairs-using-schematics-diagrams/?referralCode=66A7C5DDED0CAC9BD21E

@nworaanyika8863 8 дней назад

@@platinumphonesandcomputers This is awesome. Thanks alot

@prabhashgupta9582 Год назад

Very good

@dzabakwesi2213 9 месяцев назад

Please what is the function of the jumper and the reason for disconnecting it at 2:50 . Thanks

@saeedyazari 9 месяцев назад

I have hp probook 4320s with the same problem but i don't think anyone here can do the repair as you did.

@alimoradi2323 2 года назад

Buy some small nuzzles for your hot air gun. That way you focus your hot air on the area you want, avoiding thermal shocking other components or plastic parts and you can put/pull components faster.

@platinumphonesandcomputers 2 года назад

I do have them but its better with no nuzzle the heat is distributed evenly that makes chips come off easily without smoking the motherboard

@sanji360 Год назад

Thanks allot

@bonifacemambo6990 2 года назад

great step by step schematic review and that has challenged me as a technician based in nairobi moi avenue as i have encountered this problem severally with 840 g1 and g2 but have never solved it...you are a one great mind i'd like to work with...can i get your location or where you are based?..

@platinumphonesandcomputers 2 года назад

Thank you brother, I do work from Kampala Uganda

@maduhueddy5076 2 года назад

@@platinumphonesandcomputers are you conducting a class for repair? I also interested with your lessons ..... Pls may I get your contact too

@platinumphonesandcomputers 2 года назад

@@maduhueddy5076 yes we are, where a you from?

@patrickmuriithi1993 Год назад

Hey boni, uko nairobi side gani, can you help me with this exact problem

@optimuxgym1452 Год назад

Hae bonface , am in nairobi my laptop has same problem, am in anairobi can you help?

@microsoftelnobey1086 2 года назад

Grateful thanks alot

@platinumphonesandcomputers 2 года назад

You're most welcome

@AbdulMajeedHamid 11 месяцев назад

Nice

@anonymousavatar57 9 месяцев назад

Where are you located? I need mine repaired asap in nakuru

@Dheazzo Год назад

Awesome work dude I have 840 G1 but the back light is faulty sometimes it comes on then after a minute or two it goes off. Where can I tackle specifically

@platinumphonesandcomputers Год назад

Thank you, the backlight you should start with the fuse near the screen connector, even a screen can also be a suspect

@Dheazzo Год назад

@@platinumphonesandcomputers we are dealing in the same industry, I replaced the screen, changed all the basics. In fact when I connect the laptop to the external display the inbuilt screen comes on but when I disconnect the external display the laptop stays with the light but after a minute or two then it starts to blink and it goes dark again

@kennedyowallo 4 месяца назад

Hi i have a hp probook 6470p that has the same problem, how can i get intouch with you to fix it

@zilicontech 2 года назад

I enjoyed this video. I have some challenges, please, can you be of help?

@emekaobi2727 9 месяцев назад

Can you please link me to where I can get the schematic elitebook 840 g3

@m.saleemsharif5225 Год назад

❤️❤️❤️❤️❤️

@qeevohhatta4321 2 года назад

hp 9470 folio turns on and stop and start again. how will i go about it

@byukusengebaraka835 2 месяца назад

I changed my eeprom just like u guided! It worked! Thanks! But it turns off itself automatically every 30mins and I turn it on again without any problem! Do u any idea what that might be? And what I should do?! Thanks

@leoncedongo Месяц назад

Clean ME Region will solve your second problem

@InfiniteHub5 Год назад

Amazing Brother! :) I have a question, does this method works with HP 820 G1 ? I am not able to find its schematics anywhere

@platinumphonesandcomputers Год назад

Yes it should, 840 G1, 840 G2, 820 g1 All there schematics resemble that of 840 G1, if you are a keen enough you could fix all of them with 840 G1 schematics

@alexmarcus-ku6wq 8 месяцев назад

Mine is hp8440p keeps blinking blue n orange when I connect the charger what might be the problem

@baitabaitah9415 Месяц назад

My hp elitebook 840 g3 doesn't turn on I power it on and the battery light blinks 8 times then the capslock blinks 1 long one then the laptop turns off. What could be the issue?

@HienNguyen-tx9vk 9 месяцев назад

Could you share for me schematic HP 840 G1 UMA, thank you so much ❤

@johnkungu6917 Год назад

kindly do more videos on 840 g1 and g2

@platinumphonesandcomputers Год назад

Sure i will

@hanningtonopondo8907 Год назад

My HP note book i3, does not start only that the lead charger light keep on blinking when I insert the charger cable and plug it on. What could be the problem.

@platinumphonesandcomputers Год назад

checkout this video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Qbxs7OfGXBk.html

@dc7052 Год назад

Hey, my hp elitebook 840 g4 has black screen issue and it started when I accidentally kicked the charger while it was charging. I need your location or contact details

@platinumphonesandcomputers Год назад

Check about page

@emiratemuhammad5752 2 года назад

Please help me with hp 840 g1 not turning on, keep blinking one time whenever you put adapter charger

@platinumphonesandcomputers 2 года назад

check charger middle pin

@emiratemuhammad5752 2 года назад

Thanks

@tikurupani 10 месяцев назад

Hello chaz, i am having same fault in my Hp Compaq Pressario Cq61, if l press power button it turns off within. 1 second just a blink of light on the lcd, screen, I downloaded the schematic s but could not figure it out which IC chip i have to look for can you please help me out,. Thanks

@platinumphonesandcomputers 9 месяцев назад

Most times that is due to thermal issues, missing feedback signals or secondary circuit short. Check the boot sequence of that motherboard in the schematics and verify if all the SO signals are present

@bonifacemambo6990 Год назад

by tha way friend..how did you come to arrive at chip u7400 ??!!...am a little bit confused there.

@platinumphonesandcomputers Год назад

Yaa that's the chip that gives out all system power good signal, it was short. The video was quite long, I cut off that part

@emekaobi2727 9 месяцев назад

Can I get the schematic diagram

@mohammed_1927 2 года назад

Is there an alternative to this chip? lmv393v

@platinumphonesandcomputers 2 года назад

Yaa that's an operational amplifier, any other OP Amp will work fine

@boilingbrain4818 Год назад

Nice one man, learn something new

@DragonMals Год назад

How do you fix the issue with this computer dying when it reaches 19%?

@platinumphonesandcomputers Год назад

That is probably a battery issue

@DragonMals Год назад

@@platinumphonesandcomputers I've switched my battery twice within the lifepan of me having this PC. I also forgot to point out that mine doesn't come with Bluetooth