Lenovo g50-30 self power up and dark screen

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • nels
    Member
    • Oct 2015
    • 14
    • france

    #1

    Lenovo g50-30 self power up and dark screen

    hi all,

    aim trying to repair a lenovo g50-30

    black screen ,just led and dvd start.
    hdd not turn on and wen i plug the charger its power on (just leds..)

    any idea?

    thanks
  • pyry
    Member
    • Dec 2015
    • 37
    • Mexico

    #2
    Re: Lenovo g50-30 self power up and dark screen

    First check with a flashlight the screen has an image
    you should see some letters or something like that
    if you see something check these signals
    LID_SW #, INVT_PWM, DISPOFF # should have 3v

    Comment

    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France

      #3
      Re: Lenovo g50-30 self power up and dark screen

      Check if you have CPU VCore, if it's there, try flash the BIOS.
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

      Comment

      • nels
        Member
        • Oct 2015
        • 14
        • france

        #4
        Re: Lenovo g50-30 self power up and dark screen

        thanks for reply

        pyry: nothing on screen ,nothing on external screen vga port.

        piernov :bios is mi first thing ,i use arduino+serprog to flash but 3.3v chip,
        this chip is 1.8v need to find the way to program 1.8v chip...,but i have replaced the chip it one from another motherboard ,same motherboard and same bios the symptoms still the same.

        cpu (pl902)= 0.945v
        on 5v (pl402)=5.18v
        on 3v (pl401)=3.480v

        3v at 3.480v its normal ?

        thanks

        Comment

        • Luaina
          Member
          • Sep 2016
          • 12
          • Madagascar

          #5
          Re: Lenovo g50-30 self power up and dark screen

          Check for lvdsvdden. It should be 3.3v. If it is not present, reflow the graphic card or reball

          Comment

          • nels
            Member
            • Oct 2015
            • 14
            • france

            #6
            Re: Lenovo g50-30 self power up and dark screen

            thanks Luaina,

            but this model have integrated video on cpu.

            and its power up (just led) when charger is plugged .

            Comment

            • Luaina
              Member
              • Sep 2016
              • 12
              • Madagascar

              #7
              Re: Lenovo g50-30 self power up and dark screen

              Originally posted by nels
              thanks Luaina,

              but this model have integrated video on cpu.

              .
              All the things that you just described points to the faulty graphic card (And yes, it includes the integrated one). The last asserted signal before POST which enables the LCD is LCDVDDEN. That's why It's a good idea to check it and act accordingly.

              Comment

              • Chieftain
                Senior Member
                • May 2016
                • 72
                • Greece

                #8
                Re: Lenovo g50-30 self power up and dark screen

                Friend your problem is a defect bios chip... I replaced the bios chip with a 3.3v chip from another vendor with double capacity (16mb) and my laptop posted... Ofcourse with warning message : " Bios vendor is not in the Lenovo's vendor list" but after 5 secs laptop continues fine... Find another same or similar Bios chip and flash it . I also sharing w you the bios dump .. My model is NM-A272 With i3 and w/o extra VGA.
                Attached Files

                Comment

                Related Topics

                Collapse

                • PantherDave
                  Microsoft Surface Pro (5th gen) model 1796 - no power
                  by PantherDave
                  Hi all!

                  I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅

                  I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
                  https://www.badcaps.net/forum/troubl...-hardware-devi...
                  05-29-2024, 02:01 PM
                • Mita99
                  Lenovo Thinkpad P72 EP720 NM-B723 MB - Power disabled within 2 seconds after plugging the charger
                  by Mita99
                  Hi,

                  Try to repair a Thinkpad P72 EP720 NM-B723 MB with I7-8850H processor and N18E-Q1-KB-A1 (P3200) GPU with 6GB memory. Unfortunately there is noinfo what happened to the laptop. I got it disassembled with parts missing, like keyboard, battery.

                  Unfortunately I have no schematic available for me (requested in the sub porum) but got the boardview file.

                  Symptom: after connecting to the charger the power led light up for one-two second and switch off. After a couple secons the power led light up for half a second and switch off. No battery, no IO board, no...
                  04-27-2025, 07:20 PM
                • Dr.d
                  Help please..Lenovo ideapad 5 14itl05 power and charging problem
                  by Dr.d
                  I have a lenovo ideapad 5 14itl05, board LA-K321P, That will only power up on Battery only, or with battery disconnected and power adapter only. If battery is connected and usb-c power plug connected. It only works on battery and will not charge. I can however force it to charge by connecting the battery from a disconnected state while the power USB c plug is powering the laptop.

                  Additionally....to add to this strange situation. The usb-c power plug ONLY works to power the laptop on one side when inserted into the boards power usb c plug. If you rotate it 180 degrees, the board gets...
                  04-05-2024, 11:48 AM
                • grimacelord
                  HP 15-EH1070wm - Black Screen With Power LED.
                  by grimacelord
                  Hello,

                  I have an HP 15-eh1070wm laptop that came to me for the same reasons I am starting this thread. The charging LED appears when the laptop power adapter is connected and the power LED appears when pressing the power button, but nothing appears on screen.

                  First thing I did was take off the bottom panel and remove the battery and then press and hold the power button for 30 seconds and then reinstall the battery and power on. The fan spins and this time, the back light illuminates and a brief message appears on the screen for about 1 second saying something along like,...
                  01-28-2023, 10:50 AM
                • joaquinmjuan
                  Canon TS8350 Screen Freezes on Power On
                  by joaquinmjuan
                  Hello, I have a Canon TS8350 printer. The problem is that when I turn it on, "CANON" appears on the screen, but it never goes away. You can leave it on for a whole day, and it doesn't go away. Does anyone know how to fix this? I've tried unplugging it, but nothing. I've also tried holding down POWER, but nothing. In fact, once it turns on, it can't be turned off with the Power button. I've also held down Power and then plugged it into the Power supply, and the power light flashes once and doesn't turn on, but then when I press Power again, it turns on. Currently, it's a nearly new paperweight,...
                  05-07-2025, 12:26 AM
                • Loading...
                • No more items.
                Working...