• Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu

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 / firmware 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 Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 28 September 2023, 15:25
Cześć,

Mam na stole płytę Lenovo Y50-70 na płycie LA-B111P. Po wciśnięciu włącznika na płycie obecne są prawidłowe napięcia na wszystkich cewkach. Wentylator startuje tylko na chwilę i się zatrzymuje. Brak obrazu. Pobór prądu się nie zmienia. Przeprogramowywałem już bios i KBC ale nic to nie zmieniło, zachowanie płyty jest dokładnie takie same. Z włożoną kością Ram i bez laptop też zachowuje się tak samo.

Niepokoi mnie nierównomierne grzanie się procesora. Poniżej załączam zdjęcie. Czy to oznacza uszkodzenie procesora

Image

Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Google Adsense [BOT] 28 September 2023, 15:25

#2 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 6 October 2023, 20:34
Kupiłem drugą płytę w stanie nie znanym, po wciśnięciu włącznika laptop się uruchamia ale nie ma obrazu. Dla testu włożyłem pendrive z diodą i dioda mruga. Zrobiłem zdjęcie kamerą termowizyjną i na tej płycie procesor tez niepokojąco nierówno się nagrzewa
Image

Czy ktoś ma doświadczenie w tym temacie aby mi pomoc?

#3 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by matic 7 October 2023, 13:31
Hello!

Measure the resistances to ground on all coils.

#4 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 18 October 2023, 18:20
Resistances to ground on all coils.
PL1201 - 4k - 5V
PL702 - 165 ohm - 1V
PL302 - 1,2k - 2,5V
PL402 - 2,1k - 3,3V
PL502 - 218 ohm - 1,39V
PL404 - 3,6k - 5V
PL902 - 13,8 ohm - 0,9V
PL903 - 13,8 ohm - 0,9V
PL904 - 13,8 ohm - 0,9V
PL1102 - 25,5 ohm - 1,6V
PL1103 - 25,5 ohm - 1,6V
PL1104 - 25,5 ohm - 1,6V

#6 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by matic 19 October 2023, 09:54
- Measure the voltage to ground on cathode (- pin) of diode PD1201.
- Measure the voltages to ground on pins 2, 8, 10 of chip PU1201.

#7 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 23 October 2023, 08:19
doesn't work on the external monitor.

voltages on the JEDP1:
26, 3,3V
27, 0V
28, 0V
29, 0V
34, 0V
40, 19,98V

voltage on the PD1201:
(+ pin) - 5V
(- pin) - 12,25V
voltages on the PU1201:
2, 1,2v
8, 5v
10, 5v

#8 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by matic 23 October 2023, 08:38
Are the CapsLock, NumLock buttons on the keyboard respond?

- Measure the resistance to ground on pin 1 of chip U11 with the matrix connecteed.
- Measure the voltages to ground on pins 4, 5 of chip U11.

#9 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 29 October 2023, 18:55
CapsLock and NumLock doesn't respond.

U11:
resitance on the pin 1 - 9k ohm
voltage on the pin 4 - 0V
voltage on the pin 5 - 3,3V

#10 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by matic 2 November 2023, 10:53
Measure the power consumption (in mA) of the board, when the machine is turned on with and without RAM memory connected. The main battery must be disconnected from the board.

#11 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 4 November 2023, 12:39
The power consumption of the board when the machine turned on is 0.6A with and without RAM. I tried several RAMs

#12 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by matic 4 November 2023, 13:00
Have you tested the board with a low voltage DDR3L RAM memory?
If so, test both RAM slots with a DDR3 RAM slot LED tester:
Image

#13 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 12 November 2023, 12:39
Yes, I tested on several low voltage DDR3L RAMs. I bought an LED tester and tested both RAM slots. All LEDs on the tester are lit on both slots.
Image
Image

#14 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by matic 14 November 2023, 09:09
Measure the voltages to ground on pins 2, 6, 13, 14, 17, 20, 37, 95, 100, 116, 127 of KBC chip in the following cases;
a) Before pressing to the power button (machine turned off).
b) After pressing to the power button (power LED is turned on).

Measure the following voltages to ground, when the machine is turned on (power LED is turned on):
- On pins 9, 32, 66, 67, 71, 101, 106, 107, 108, 110, 114, 115, 124 of KBC chip.
- On pads 1, 2 on the place of chip U6 (this chip is factory not soldered to the board).

#15 Re: Lenovo Y50-70 na płycie LA-B111P - nie daje obrazu


by Mimek 18 November 2023, 12:25
The voltages to ground on pins of KBC chip

a) Before pressing to the power button (machine turned off).
2, 0v
6, 0v
13, 0v
14, 0v
17, 0v
20, 0v
37, 3,26v
95, 0v
100, 0v
116, 0v
127, 0v
b) After pressing to the power button (power LED is turned on).
2, 3,28v
6, 3,35v
13, 3,35v
14, 3,35v
17, 3,35v
20, 3,35v
37, when I apply the probe, then the motherboard turns off and then I have 3.35 V. I can't measure the voltage when turned on
95, 3,28v
100, 3,28v
116, 3,28v
127, 3,35V

The voltages to ground on pins of KBC chip

9, 3,28v
32, 3,25v
66, 0V
67, 3,28v
71, 3,28v
101, 0v
106, 3,28v
107, 0v
108, 3,35v
110, 3,25v
114, 3,25v
115, 3,3v
124, 3,27v

The voltages to ground on pins of U6 chip
1, 3,28V
2 , 0,9V

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: No registered users and 5 guests

_______________________________
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.