Bad caps on logic board

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • 1supertech
    Badcaps Veteran
    • Apr 2012
    • 384
    • USA

    #1

    Bad caps on logic board

    Hello folks
    I have acquired 10 none working hp Planar Pl1700 monitors, so far I repaired 5 monitors all with bulging caps on power supply. But I noticed allot of the caps on logic boards tested out of specs from 2.00 ohms to 4.50 ohms, caps are 220uf 16v 85c Lelons after repairing 5 of the 10 monitors with out replacing caps on logic board all 5 work fine no odd symptoms.

    What would the symptoms be with high esr caps on logic board since ccfl are bad. I tested with good ccfl all light up.

    On the nest 5 monitors should I us 85c caps or 105c
    Attached Files
    Last edited by 1supertech; 07-27-2012, 07:24 AM.
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Bad caps on logic board

    What I see when I have bad caps on the logic board which the caps are used by the LDO, the symptom I see is: noise and line noise on the screen, BL_ON goes off when I use native resolution but OK on lower resolution. Bad DC can cause a lot of non-repeatable symptom.
    Just fix this one with the above symptom:
    http://s807.photobucket.com/albums/y...NNSG%20HG281D/
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • 1supertech
      Badcaps Veteran
      • Apr 2012
      • 384
      • USA

      #3
      Re: Bad caps on logic board

      Thanks budm

      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
      • m1ch43lzm
        HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
        by m1ch43lzm
        Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
        Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
        05-12-2025, 08:37 PM
      • ohren
        Upgrading a Samsung ue55nu7096u with logic board from an ue55ru7105k -- good idea?
        by ohren
        I hope this is the right forum to post in despite not technically being a repair, but still a question of swapping boards.

        I thought I'd explore the possibility to upgrade an existing working Samsung ue55nu7096u with the logic board (and power board if needed) of a newer model (ue55ru7105k) of the same size and appearance (and resolution). The reason being I'd like the extra inputs of that board including component in, an extra HDMI port and bluetooth. Its panel is broken so I have no use for the board otherwise.

        The models launched in 2018 and 2019 respectively....
        09-08-2023, 05:24 PM
      • momaka
        HannStar Hanns-G HC194d LCD monitor repair
        by momaka
        Normally, I never post repairs this quick after I do them, because… I am usually very slow. But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
        03-15-2023, 10:17 PM
      • Dani_2024
        Sceptre U550CV-UMR 4K LED, Bad Caps on Main Power Board?
        by Dani_2024
        Hi and thanks in advance for any input you might provide!
        I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
        Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO

        Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this...
        10-28-2024, 05:06 PM
      • Loading...
      • No more items.
      Working...