Acer LA-5891P

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • pcnetch
    Senior Member
    • Aug 2013
    • 125
    • Sri Lanka

    #1

    Acer LA-5891P

    Hi Friends.... Help me. I am in a trouble. This is Acer Aspire 5742GZ and LA-5891P mother board. This one, power on but no VGA power supply and PLTRST. PCH Crystal and BIOS CS Pin Not function with Oscilloscope. PCH power Supply OK. VGA power on signal not coming from PCH. I gave manual signal for VGA power supply. Then VGA power comes. But no display. As you think PCH Bad or another Idea. Thanks.
    Last edited by pcnetch; 02-09-2016, 09:26 AM.
  • Pragmatiko
    Badcaps Veteran
    • Jul 2013
    • 468
    • IT

    #2
    Re: Acer LA-5891P

    usually is GPU soldering problem, try to reflow.

    Comment

    • pcnetch
      Senior Member
      • Aug 2013
      • 125
      • Sri Lanka

      #3
      Re: Acer LA-5891P

      Thanks for replying me. I re-flowed the GPU. But same. Why PCH Crystal and BIOS cs pin signal not working.

      Comment

      • Pragmatiko
        Badcaps Veteran
        • Jul 2013
        • 468
        • IT

        #4
        Re: Acer LA-5891P

        Originally posted by pcnetch
        Thanks for replying me. I re-flowed the GPU. But same. Why PCH Crystal and BIOS cs pin signal not working.
        did you flashed bios?

        Comment

        Related Topics

        Collapse

        • Tynan Dill
          Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
          by Tynan Dill
          I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

          Upon bringing it home and plugging it up, it showed a standby light.

          I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

          The screen seems to blackout and stay black, but with a flashlight I can see the display.

          With my Playstation 4 connected via HDMI, and running a game I can hear sound.

          Assuming...
          11-22-2024, 01:46 PM
        • sam_sam_sam
          Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
          by sam_sam_sam
          I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

          One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
          03-31-2024, 02:12 PM
        • sam_sam_sam
          Modification to a ZD-987 desoldering/soldering station using a external switching power supply
          by sam_sam_sam
          I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

          I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
          07-01-2024, 06:34 AM
        • JimBanville
          Definitive technology SC 2000 subwoofer amp's power supply clicking and popping
          by JimBanville
          The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
          Opened it up and discovered the power supply is making a faint clicking or ticking sound.
          I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
          I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles...
          09-13-2023, 07:21 AM
        • burntonnerings
          Acer K272HUL blue power light but black screen, power supply is ok
          by burntonnerings
          Have had two Acer K272HUL monitors die with the same symptoms:

          - Blue power light is illuminated while the monitor is plugged in
          - Black screen (no splash screen, etc.)
          - Power button doesn't do anything

          Opened it up and checked for bad caps and components, evidence of burns, etc. - everything looks fine.

          Power supply voltages are fine.

          There are some signal lines on the power supply harness that goes from the power supply to the logic board, not sure what these should be at.

          Anyone have any ideas?...
          12-09-2023, 10:22 PM
        • Loading...
        • No more items.
        Working...