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Gateway 900G 19" LCD monitor: LVDS cable GLUE?

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    #21
    Re: Gateway 900G 19" LCD monitor: LVDS cable GLUE?

    Originally posted by eccerr0r View Post
    FUUQ
    Now I know why this thing gets so hot... I thought it was a switching power supply and then I notice a TO220 with

    7812 ***

    printed on it... aaaahhh....
    *** This will give you more heat if loading the hell out of it ***
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

    1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
    2 Hem Saw Computer Stack Board

    All of these had CAPs POOF
    All of the mosfet that are taken out by bad caps

    Comment


      #22
      Re: Gateway 900G 19" LCD monitor: LVDS cable GLUE?

      Boom!
      Attached Files

      Comment


        #23
        Re: Gateway 900G 19" LCD monitor: LVDS cable GLUE?

        Originally posted by eccerr0r View Post
        Boom!
        Ops not going very good it has seen better days

        How hard would it be to put a buck converter board in place of the lm7812
        Because they also make switch regular that runs a lot cooler and does not require a heat sink unless you run the hell out of it they have voltages from 3.3/5/12 and an adjustable version as well of this type of regular

        Here is a website that sells the 5 volt version of this type of regulator I have used them in the past and they work very well and do not run very hot

        https://www.futurlec.com/Mini_Power.shtml

        Here is the 12 volt version of this type of regulator however they do not offer the single power rail anymore unfortunately but you just make a board using the same exact parts

        https://www.futurlec.com/Mini_Power_Dual_12V.shtml

        Here is the 12 volt version 3 amp version of the same type of regulator

        LM2576HVT-12

        Here is the 5 volt 3 amp version for this type of device

        https://www.futurlec.com/Mini_5V_High_Power.shtml

        I only posted this information for reference purposes
        Last edited by sam_sam_sam; 04-16-2022, 03:15 AM.
        9 PC LCD Monitor
        6 LCD Flat Screen TV
        30 Desk Top Switching Power Supply
        10 Battery Charger Switching Power Supply for Power Tool
        6 18v Lithium Battery Power Boards for Tool Battery Packs
        1 XBox 360 Switching Power Supply and M Board
        25 Servo Drives 220/460 3 Phase
        6 De-soldering Station Switching Power Supply 1 Power Supply
        1 Dell Mother Board
        15 Computer Power Supply
        1 HP Printer Supply & Control Board * lighting finished it *


        These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

        1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
        2 Hem Saw Computer Stack Board

        All of these had CAPs POOF
        All of the mosfet that are taken out by bad caps

        Comment


          #24
          Re: Gateway 900G 19" LCD monitor: LVDS cable GLUE?

          Other option is to relocate the 7812 to a different heatsink perhaps, but I just noticed something else...probably have to desolder the diode but I noticed it seemed a little leaky... this would cause some heat...

          Comment


            #25
            Re: Gateway 900G 19" LCD monitor: LVDS cable GLUE?

            Welp, in went some new caps and the monitor is alive again. Posting this so I have a record when I last changed them...again...

            Some Chemicon and Nichicon caps went in this time, and two 470uF 25V caps went in instead of a 1000uF 25V. I think the former might be better as it's more surface area to dissipate heat.

            Now...when will be the next time I repair this monitor...

            Comment

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