HP EliteBook 840 not charging not turning on, motherboard repair

Подписаться 8 тыс.

Просмотров 39 тыс.

50% 1

If you realized HP Elitebook 840 series have been failing a lot in recent years, which I think is due to time since they have been in existence for almost 10 years. Today I decided to share a video demonstrating how to disassemble, diagnose and fix an HP laptop that does not turn on or charge.
This is very common, where a laptop standby voltage control IC fails to create first stage volts that enable the system to power on.
The chip I replaced is called TPS51225, it's very common in laptop motherboards with 4th Gen processors, like HP 820, Dell 6440, etc.

Опубликовано:

13 сен 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 59

@uxeys1k791 11 месяцев назад

0:42 saved me, I checked adapter and it wasnt working and just yellow and white lights blinking. now everything fixed. Thanks a lot.

@escobarvon6065 2 года назад

Thanks, it was really helpful. At least I know where the fault is from

@platinumphonesandcomputers 2 года назад

You are welcome

@LeAdri1du40 Год назад

Most cowboy repair I've ever seen, amazed it worked, the soldering iron and air blower are way too big for smd and measuring a live motherboard, my man likes risks

@platinumphonesandcomputers Год назад

hahaha thanks

@icewater4723 3 месяца назад

Hi, friend! I have the 850 g4 laptop, but there is a problem, it won’t turn on. I measured it on the incoming mosfet. 19 volts come to the D contact, and only 1.6 volts to G and S. What could be the problem?

@user-ie5tr4nx7v 8 месяцев назад

Спасибо, помогли решить головоломку.

@in2Rafi Год назад

My HP Elitbook 840 laptop is sometimes charging but sometimes not charging at all. Moreover its not running without battery. How can I solve the issue?

@clintonaligwo Месяц назад

Please can a g2 voltage chip work for g3?

@platinumphonesandcomputers Месяц назад

No they are different

@clintonaligwo Месяц назад

@@platinumphonesandcomputers alright

@030H 11 месяцев назад

Well done 👍

@TFT00852 3 месяца назад

Bhai Mera bhi repair kr doge

@soblez334 2 года назад

Thank you very much Platinum Phones & Computer, Pls i need your help for explanation, cause as a beginner, is not really profitable to me without explanation

@platinumphonesandcomputers 2 года назад

Thank you, We can organize for online classes on Zoom, contact me

@michaelcosta7235 4 месяца назад

Laptop was working fine but not charging. Did this procedure and now it won't power on.

@VictorBamgbade-cg8rk Год назад

Please I have the same PC with this same prob

@OnlyPcMobilegames 2 года назад

My laptop hp Elite book g1 840 buttom side heating and "power led on" . heating only and not power on

@platinumphonesandcomputers 2 года назад

You can follow this video to fix it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-lX69uFGHDj0.html

@emiratemuhammad5752 2 года назад

Can you please share hp 840 G1 continues blinking light once, when you plugged in adapter and it doesn’t turn on

@platinumphonesandcomputers 2 года назад

continues blinks depends on which led is exactly blinking, but probably adapter without middle pin does A fault ram however this include caps lock and num 3 times And a fault bios firmware

@patrickmusyokimutiti3331 2 месяца назад

Do you do repairs?

@platinumphonesandcomputers Месяц назад

That is obvious

@universejorel Год назад

hi my hp folio 1040 works on charger but it dosen't with the battery even if replaced. any ideas?

@platinumphonesandcomputers 11 месяцев назад

Its most times due to the MOSFETs that allow battery voltage to the main rail not opening. You may need to check there it can be fault or short

@camerondavis2012 2 года назад

hey so i didnt have 5v at the LDO but i did have the 3.2v on the LDO is mine the same problem that needs to be fixed

@platinumphonesandcomputers 2 года назад

Try checking the condition of the 5V LDO regulator, or disconnect the external 5v LDO circuit and see if 5V comes up

@hrishikeshprabhakar8024 9 месяцев назад

आप कहां के हैं मेरा भी लैपटॉप hp Elitebook 840 है जो चालू करने पर दो बार लाईट जलाकर बंद हो जाता है दिखाए तो बोले पावर बतम लोक टूट गया है जो नहीं बनता है

@judychebet617 Год назад

where can we find your services here in Kenya Nairobi

@platinumphonesandcomputers Год назад

In Uganda

@richardappow6770 Год назад

what is the name of your multimeter and where to buy one?

@platinumphonesandcomputers Год назад

Its called Chengfa 98A+, this specific brand is rare these days but if you search for auto range multimeters you can find some like this

@zaharaddeenel-hassan1771 2 года назад

Please I have HP 1040 g2 is the same problem could it be the same solution?

@platinumphonesandcomputers 2 года назад

probably, follow the video and check for those volts rails

@km.younus.79 3 года назад

amr same modeler laptoper same problem, apni solve kore dite parben??

@platinumphonesandcomputers 2 года назад

can you write in english

@exceptionalfahim2709 2 года назад

Vai thik koraicen?

@melaniemariner9703 2 года назад

Hi can you please confirm the name of the part you called (voltage chip) and where I can get one please?

@platinumphonesandcomputers 2 года назад

Hey, that chip is TPS51225 made by Texas instruments, you can get it from other 4th Gen Motherboards' on some online websites.

@melaniemariner9703 2 года назад

@@platinumphonesandcomputers hi thanks for your reply when I test it as it is it shows around 3v or just over on some of the terminals am I too assume it's suppose to be 5v or 19 consistently?

@platinumphonesandcomputers 2 года назад

Now the processor of diagnosing that chip is a bit complex, it has 4 voltage regulators inside, each giving out two 3.3Volts and two 5Volts. 19 or battery voltage should be present on Vin and power MOSFETs, however, there are also other enable and reference volts that should be present to enable the chip to make those volts.