• Lenovo B50 - nie uruchamia się

Forum rules:Click here to view the forum rules

  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
  3. Before posting a new topic please read all topics in TRAININGS subforum and make a preliminary diagnostic based on the content of those trainings.
  4. Uploading of any complete schematics, BIOS files or any other kind of documentation, or linking to 3rd party websites with such files, is STRICTLY PROHIBITED. You can only upload the small portion of documentation or, link to BIOS file on UNVERIFIED BIOS FILES subforum, which simplifies the diagnostics/repair. You are not allowed to upload more then one complete page of instruction/schematic per single topic. The file you upload must not contain any watermarks, "confidential" markings, links or email addresses and cannot be password-protected.
  5. It is only permitted to describe one faulty device per single topic - you should always open a new topic for each subsequent device.
  6. Requesting of the full schematics, BoardView files, BIOS files or any other kind of documentation is NOT ALLOWED in this subforum. If you need to ask for any of these, you should open a new topic in DOCUMENTATION/BIOS REQUEST subforum.
This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).

#1 Lenovo B50 - nie uruchamia się


by franekx6 8 January 2020, 14:01
Lenovo B50

Płyta z podpiętym RAMem i wentylatorem po podłączeniu pobór 12mA po włączeniu 230mA, działa około 4s i się wyłącza. Przed całkowitym "zgonem" laptop po włączeniu chwilę działał, zawieszał się, wyłączał się ekran, "ekran skakał", pomagało wyciągnięcie baterii - to tyle z relacji klienta. U mnie po włączeniu laptopa odpaliłem Furmarka i po kilku minutach wyłączył się, obecnie objaw jak wyżej.

Celuję w GPU (oby nie CPU).

Podmieniany RAM, reset BIOS, podgrzany diagnostycznie GPU.

Co jeszcze zrobić w celu dokładnej diagnozy?

ZIWB2/ZIWB3/ZIWE1

LA-B091P REV 2.0

216-0867030

SR244

PL601 480Ohm 1V

PL902 40Ohm 0.8V

PL302 4MOhm 2.7V / pomiary bez baterii

PL802 266Ohm 1.08V

PL1102 77Ohm 1.7V

PL402 10kOhm 3.3V

PL404 75kOhm 5.1V

Pozdrawiam

Re: Lenovo B50 - nie uruchamia się


by Google Adsense [BOT] 8 January 2020, 14:01

#2 Re: Lenovo B50 - nie uruchamia się


by matic 8 January 2020, 21:17
Hello!

Measure the power consumption (in mA) of the board before and after pressing to the power button without main battery connected.

#3 Re: Lenovo B50 - nie uruchamia się


by franekx6 8 January 2020, 21:52
All the above measurements were made without main battery. Before pressing the power button I have 12mA after pressing the power button have 230mA and after 4s turns off.

#4 Re: Lenovo B50 - nie uruchamia się


by matic 8 January 2020, 22:59
How about the voltages and resistances to ground on coil PL502, PL701?

Measure the voltages to ground on jumpers PJ503, PJ602, when the laptop is turned on.
Measure the voltage to ground on pin 1 of transistor UV14, when the laptop is turned on.
Measure the voltages to ground on pins 1, 3 (D and S) of transistor QV16, when the laptop is turned on.

#5 Re: Lenovo B50 - nie uruchamia się


by franekx6 10 January 2020, 10:39
PL502 600Ohm 1.39V
PL701 16kOhmn 1.5V
PJ503 0.67V
PJ602 1.8V
UV14 n1 1.3V

QV16
n1 3.3V
n2 5V all when laptop is turn off and fall to 0V when laptop is turned on
n3 3.3V

#6 Re: Lenovo B50 - nie uruchamia się


by matic 10 January 2020, 19:42
Try to turn on the laptop without RAM memory connected.
Are there any changes in operation in this case? Also measure the power consumption in this case, when the laptop is turned on.

#7 Re: Lenovo B50 - nie uruchamia się


by franekx6 11 January 2020, 11:08
No change , without RAM memory is that same effect and that same power consumtion

#8 Re: Lenovo B50 - nie uruchamia się


by matic 11 January 2020, 11:31
Do you have a DDR3 RAM slot LED tester?
If so, test both RAM slots.

#9 Re: Lenovo B50 - nie uruchamia się


by franekx6 13 January 2020, 12:06
No LED lighting both slot ODT0 ODT1. It is OK?

Image
Image

#10 Re: Lenovo B50 - nie uruchamia się


by matic 13 January 2020, 19:12
franekx6 wrote:No LED lighting both slot ODT0 ODT1. It is OK?
I think it is ok.

How abut the LED "DQ23" on slot "JDIMM2"? In the picture it looks like it does not shine.

Image

#11 Re: Lenovo B50 - nie uruchamia się


by franekx6 15 January 2020, 10:17
DQ23 it is OK , in the picture it looked does not shine
Image

when I turn on few time motherboard the most warm is PL1102 , five time turn on 30℃, other components sa cold

#12 Re: Lenovo B50 - nie uruchamia się


by matic 15 January 2020, 19:55
Measure the voltage to ground on pin 13 of KBC chip, when the laptop is turned on (power led is turned on).

#13 Re: Lenovo B50 - nie uruchamia się


by franekx6 16 January 2020, 10:21
matic wrote:Measure the voltage to ground on pin 13 of KBC chip, when the laptop is turned on (power led is turned on).


All time 0V

#14 Re: Lenovo B50 - nie uruchamia się


by matic 18 January 2020, 14:52
Try to reflash the KBC chip. Don't forget to save the old dump.

If it does not change anything try to reflow the APU hybrid.

#15 Re: Lenovo B50 - nie uruchamia się


by franekx6 20 January 2020, 12:33
matic wrote:Try to reflash the KBC chip. Don't forget to save the old dump.

I reflash KBC, but does not change

#16 Re: Lenovo B50 - nie uruchamia się


by matic 20 January 2020, 22:10
Try to reflow the APU hybrid.

#17 Re: Lenovo B50 - nie uruchamia się


by franekx6 3 February 2020, 13:28
I reflow APU and GPU but still the same problem

#18 Re: Lenovo B50 - nie uruchamia się


by matic 3 February 2020, 19:36
Remeasure the power consumption (in mA) of the board, when the laptop is turned on with and without RAM memory.

#19 Re: Lenovo B50 - nie uruchamia się


by franekx6 4 February 2020, 12:06
With RAM
before pressing to the power button - 11mA
after pressing to the power button - 214mA


Without RAM
before pressing to the power button - 11mA
after pressing to the power button - 212mA

#20 Re: Lenovo B50 - nie uruchamia się


by matic 4 February 2020, 18:35
It seems to me that the APU hybrid is bad. It needs to be replaced.

Re: Lenovo B50 - nie uruchamia się


by Google Adsense [BOT] 4 February 2020, 18:35
This topic is marked as ARCHIVAL. Please only reply if your message contains the solution (Terms and Conditions p. 12.1).

Who is online

Users browsing this forum: JWKrzysiek and 1 guest

_______________________________
All rights reserved. Unauthorised copying of this website's content or any of its part is strictly forbidden.
Any trademarks, brand names, products or services published on this website belong to their legal owners, are copyrighted and used for information purposes only.