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

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

Рет қаралды 63,129

Күн бұрын

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...
Download a pdf document that explains the meaning of different Schematics codes and abbreviations from the link below. drive.google.c...
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

Пікірлер: 104

@daniekotze6148 9 ай бұрын

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

@alexmarcus-ku6wq 10 ай бұрын

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

@LiamB1708 2 жыл бұрын

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

@platinumphonesandcomputers 2 жыл бұрын

Thank you

@patrickamkoha2377 9 күн бұрын

Excellent explanation.

@dzabakwesi2213 11 ай бұрын

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

@saeedyazari 11 ай бұрын

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

@hitmanyt2021 Жыл бұрын

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

@ziasurrani996 Жыл бұрын

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

@alimoradi2323 2 жыл бұрын

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 жыл бұрын

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

@sakisgri2165 Жыл бұрын

Good job, very nice explanation. Thank you

@platinumphonesandcomputers Жыл бұрын

You are welcome!

@Semz8311 Ай бұрын

Raw talent🎉

@platinumphonesandcomputers 15 күн бұрын

Thanks

@nworaanyika8863 2 ай бұрын

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

@platinumphonesandcomputers 2 ай бұрын

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 2 ай бұрын

@@platinumphonesandcomputers This is awesome. Thanks alot

@bonifacemambo6990 2 жыл бұрын

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 жыл бұрын

Thank you brother, I do work from Kampala Uganda

@maduhueddy5076 2 жыл бұрын

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

@platinumphonesandcomputers 2 жыл бұрын

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

@patrickmuriithi1993 Жыл бұрын

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

@optimuxgym1452 Жыл бұрын

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

@pc-tech1937 20 күн бұрын

Nice work sir.

@platinumphonesandcomputers 15 күн бұрын

Thanks

@mand6029 Жыл бұрын

many thanks to you , i got the solution from you

@qeevohhatta4321 2 жыл бұрын

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

@baitabaitah9415 3 ай бұрын

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?

@kennedyowallo 6 ай бұрын

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

@manimarancreator Жыл бұрын

NICE EXPLANATION THANK YOU

@InfiniteHub5 Жыл бұрын

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

@platinumphonesandcomputers Жыл бұрын

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

@Dheazzo Жыл бұрын

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 Жыл бұрын

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

@Dheazzo Жыл бұрын

@@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

@emekaobi2727 11 ай бұрын

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

@user-vu1nv4qb9o 11 ай бұрын

@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...

@HienNguyen-tx9vk 11 ай бұрын

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

@sshaikh3878 Жыл бұрын

Mind blowing!

@byukusengebaraka835 4 ай бұрын

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 3 ай бұрын

Clean ME Region will solve your second problem

@ewoukemngnia2568 2 жыл бұрын

good video, thanks for the knowlegde...

@platinumphonesandcomputers 2 жыл бұрын

Thank you

@emiratemuhammad5752 2 жыл бұрын

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

@platinumphonesandcomputers 2 жыл бұрын

check charger middle pin

@emiratemuhammad5752 2 жыл бұрын

Thanks

@anonymousavatar57 11 ай бұрын

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

@chandamark7301 3 ай бұрын

Good job

@zilicontech 2 жыл бұрын

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

@user-ms2kr5si7v 7 ай бұрын

I have got the same problem on HP ELITEBOOK 840 G4 till now not yet sucessful

@generalndlovu3639 2 жыл бұрын

best explanation

@platinumphonesandcomputers 2 жыл бұрын

Thanks you

@hanningtonopondo8907 Жыл бұрын

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 Жыл бұрын

checkout this video. kzfaq.info/get/bejne/h8ioppqAy628cp8.html

@prabhashgupta9582 Жыл бұрын

Very good

@DragonMals Жыл бұрын

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

@platinumphonesandcomputers Жыл бұрын

That is probably a battery issue

@DragonMals Жыл бұрын

@@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

@emekaobi2727 11 ай бұрын

Can I get the schematic diagram

@riazrehman8941 28 күн бұрын

Mery pas laptop hai usme ye problem hai k laptop ko charger connect karta hon to laptop off ho jata hai phir on ho jata hai asay hi on off on off hota hai charger bhi change kar k dekha hai please reply

@platinumphonesandcomputers 15 күн бұрын

Check out this video. kzfaq.info/get/bejne/pdFkp6eDqp_HhoU.htmlsi=1bSjSNOcaOaeSP76

@tikurupani Жыл бұрын

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 11 ай бұрын

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

@sanji360 Жыл бұрын

Thanks allot

@microsoftelnobey1086 2 жыл бұрын

Grateful thanks alot

@platinumphonesandcomputers 2 жыл бұрын

You're most welcome

@AbdulMajeedHamid Жыл бұрын

Nice

@johnkungu6917 Жыл бұрын

kindly do more videos on 840 g1 and g2

@platinumphonesandcomputers Жыл бұрын

Sure i will

@bonifacemambo6990 2 жыл бұрын

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

@platinumphonesandcomputers 2 жыл бұрын

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

@user-my5ej9wo7o 11 ай бұрын

can you send me schema in hp 840 g3 please

@dc7052 2 жыл бұрын

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 2 жыл бұрын

Check about page

@jabirmohammed358 Жыл бұрын

I have the same laptop and it Turns on with display and then turns off. Is it the same problem with urs, please help me.!!! 🙏

@platinumphonesandcomputers Жыл бұрын

If you see the display its not the same issue

@jabirmohammed358 Жыл бұрын

@@platinumphonesandcomputers finally I figured out that the problem is with the power port. there is a disconnection of wires.

@mohammed_1927 2 жыл бұрын

Is there an alternative to this chip? lmv393v

@platinumphonesandcomputers 2 жыл бұрын

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

@mstamena8136 2 жыл бұрын

Same Problem hp elitebook 840 g1 power on but no display, Mechanic says it won't be good (Bangladesh)

@platinumphonesandcomputers 2 жыл бұрын

Send him the link of this vdeo

@ScottTreadway-bf5qv 11 ай бұрын

How much does this cost to have fixed?

@platinumphonesandcomputers 11 ай бұрын

Usually depends on your location

@m.saleemsharif5225 2 жыл бұрын

❤️❤️❤️❤️❤️

@microsoftelnobey1086 2 жыл бұрын

Can I get the shcamatic 840 g2

@platinumphonesandcomputers 2 жыл бұрын

Yaa you can search on google its there

@mcdjmadoctorjames4486 9 ай бұрын

mine dam same problem

@boilingbrain4818 Жыл бұрын

Nice one man, learn something new

@aniketverma5405 2 жыл бұрын

Bro my laptop is having same problem plz help

@platinumphonesandcomputers 2 жыл бұрын

If you follow the video, you can fix it

@mohammed_1927 2 жыл бұрын

i need bios full flash hp 840 g1

@platinumphonesandcomputers 2 жыл бұрын

send me an email

@ReverseCity777 Жыл бұрын

Im having same issue with 2 g4s

@platinumphonesandcomputers Жыл бұрын

You can follow the video and fix them

@vishalraj9302 Жыл бұрын

Wah😂

@dc7052 2 жыл бұрын

Hello

@platinumphonesandcomputers 2 жыл бұрын

Hey

@qeevohhatta4321 2 жыл бұрын

please help with hp 9470, the charge LED blink white and orange but it does not display

@platinumphonesandcomputers 2 жыл бұрын

Check charger, charging port and charger ID circuit