Dead LA-F481P laptop motherboard: thicking noise

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • guybrushthreepwood
    Member
    • Dec 2013
    • 44
    • Italy
    #1

    Dead LA-F481P laptop motherboard: thicking noise

    Hello to everyone! I have a Lenovo laptop with a broken motherboard. It doesn't show any sign of life, no fan, no leds, no whatever you may think of. The only sign is a constant thicking noise coming from a zone of the motherboard which I have taken a photo on both sides. I have touched all the components looking for an overheated one indicating some kind of power drain but nothing unfortunately, too easy!
    I tend to believe about a power stage issue otherwise it should at least charge the battery, shouldn't it? What do you think? Any advice is precious to me so thanks in advance to everyone!
    Attached Files
    Last edited by SMDFlea; 10-15-2021, 07:05 AM. Reason: LA-F481P
    Tags: None
    • petehall347
      Badcaps Legend
      • Jan 2015
      • 4426
      • United Kingdom
      #2
      Re: Dead laptop motherboard: thicking noise

      i see at least 2 blown ic chips ..dont power it on again until fixed or things might get worse
      Attached Files
      Last edited by petehall347; 10-07-2021, 12:44 PM.

        Comment

        • guybrushthreepwood
          Member
          • Dec 2013
          • 44
          • Italy
          #3
          Re: Dead laptop motherboard: thicking noise

          I thank you! I need to check the board more thoroughly then scour a service manual for it otherwise I wouldn't be able to find the right replacements... My soldering skills with SMD components remain the biggest problem unfortunately! Hot air or what? Are there some tutorials on Youtube or else on how to deal with those particular packagings? I could just go to a mobile phone repair shop and they should handle the repair more than well but how much for it without any guarantee for a successful repair?
          Last edited by guybrushthreepwood; 10-14-2021, 12:37 PM.

            Comment

            • guybrushthreepwood
              Member
              • Dec 2013
              • 44
              • Italy
              #4
              Re: Dead laptop motherboard: thicking noise

              Hello again. I've found the schematics (LA-F481P) here but they don't contain a drawing of the whole board so this is quite hard... I've taken a look at the board itself and determined that the faulty components found by petehall347 should be PQ1652 (a EMZB08P03V mosfet according to the schematics) and PU1101 (a AOZ5048QI 35A QFN24 DC/DC converter) but I'm not absolutely certain about the second one while the former makes absolutely sense.
              Still on the schematics it is adviced to replace some other stuff

              1. Change PU1101,PU1102,PU1151 from CSD97396Q4M to AOZ5048QI
              2. Change PC1101,PC1112,PC1151 from 1U_0603_10V6K to 4.7U_0603_10V6K

              when replacing PU1101. I'm quite clueless...
              Last edited by guybrushthreepwood; 10-15-2021, 06:20 AM.

                Comment

                • Antonynl
                  Senior Member
                  • Apr 2021
                  • 74
                  • Nederland
                  #5
                  Re: Dead LA-F481P laptop motherboard: thicking noise

                  Did you find the source or cause of that thinking sound or is that normal?

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • thumper69
                      Alienware M17x Laptop motherboard may be dead
                      by thumper69
                      We use a laptop to connect to an omron CPM2A serial port for programming and data transfer. Using a usb to serial adaptor and a blackbox connecting cable. The operator of the equipment had a failed ac power plug that powers the plc and changed it reversing the hot and neutral lines. the result was when connecting the plc to laptop it blew out adapter, plc, and laptop. apparently it sent 115 volt ac via ground into usb port of laptop. Laptop appears to try and power up but shuts down after a few seconds. Any repair possible or do i need new motherboard.
                      09-03-2023, 06:41 AM
                    • tk3000
                      Dead Laptop Motherboard, then refurbished one installed...
                      by tk3000
                      My venerable and old laptop (Toshiba Satellite P75-A7200 equipped with an i7-4700MQ, circa 2014) and previously a powerful machine during its heyday is no more. Have been using it for many years, but about 3 months ago it went kaputt for no apparent reason (left it on overnight [normally it goes to standby mode after some idle time], and in the morning it was cold dead with no boot, no post, no leds; nothing at all).

                      Since the 1990s I have been building custom desktop computers, etc; but it has been few years since my last built one and for the last 15 years I have built very few...
                      08-20-2022, 08:45 AM
                    • Geeker007
                      Friend messed up my laptop motherboard while working on my bench
                      by Geeker007
                      Hi All,

                      So my friend was visiting and he wanted to use my solder bench to solder on some WLED circuit board. My laptop was open on the side for RAM upgrade. I know my mistake.

                      So while soldering he had too much solder on the soldering iron tip and he just shook off the soldering iron on the table itself to remove extra solder on the soldering tip and it landed on the motherboard of laptop. He then out of fear tried to remove it using solder wick and did more damage by removing some components as well. So here I am with weird situation.

                      I have not tried putting...
                      06-16-2025, 01:40 PM
                    • jamesp
                      Lenovo laptop dead motherboard GS752 NM-C781rev. 1.0 2019-11-25 inscribed at the pcb,
                      by jamesp
                      I have a dead laptop with mainboard model GS452/552/752 nm-c781 rev 1.0, i have initiated troubleshooting with the use of digital multimeter. checked voltage signals up to PM_SLP_S3#, found out that before PM_SLP_S3# signal , a PBTN_OUT#_R signal has 3.2 volt state and after pressing power on, PBTN_OUT#, It drops to logic level zero for around 12 secs and then back again to 3.2v for 6 secs. it will loop like that until you pulled out the adapter power. during loop the PM_SLP_S3 and S4 SIGNAL has no output. (0 volt ) may i ask for help to anyone with this kind of board and same kind of problem....
                      1 Photo
                      03-18-2024, 08:17 AM
                    • Username338
                      Laptop BA92-09470B motherboard schematics
                      by Username338
                      Thank you for deciding to read this topic!

                      Laptop: NP700Z3A-S02RU
                      Motherboard: BA92-09470B

                      I was trying to fix my old laptop that has stopped displaying image a long time ago. It boots up, lights light up, fan spins but no image. Conned it to TV by HDMI cable, but it was unsuccessful. Components look intact, no water damage/corrosion on the board.

                      I don't really value this laptop too much, so I wanted to ask anyone for a schematic/boardview file or anything that describes motherboard in a simillar faison. I want to experience a challenge of figuring...
                      03-09-2025, 03:52 PM
                    • Loading...
                    • No more items.
                    Working...