Mbp A2289 no video only backlight

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • guruji
    Senior Member
    • Oct 2012
    • 118
    • India

    #1

    Mbp A2289 no video only backlight

    Hey
    i got this laptop mbp A2289 2020yr some strange problem I see only backlight come on which means the voltage to the panel is there. The laptop works very well on the external monitor.I have replaced another screen still blank display, also change lvds connector same issue.
    then I remove the lvds connector from logic board clean it I saw display once after that same thing only backlight is on.anyone faced this issue
    thanks

Related Topics

Collapse

  • Max514
    Samsung UN55H8000 sound but no backlight no video
    by Max514
    Hi all,

    Ok so I have this beautiful un55h8000 samsung tv with sound but no video nor backlight. When turning the set on the red light blinks 5 times.

    The screen shows no damage and backlight turns on when I disconnect the power supply from the main board. The tcon board only has 2 out of 3 leds on.

    I came across this page and followed the different steps: https://techhometravel.com/samsung-u...ight-no-video/
    • Unplugging the main board cable at the power supply >>> backlights came on.
    • BLU_ON signal from the
    ...
    04-14-2022, 10:34 AM
  • JaquesPratt
    Vizio D32f-E1 Powers on, has backlight, won't boot/no logo, no menu or video
    by JaquesPratt
    I have a Vizio D32f-E1 LCD TV that does NOT have a TCON board.

    This TV recently went through some 'death throes' and now won't boot. The first problem that began to manifest was while watching tv, the screen would 'freeze', and the image would dim over a few seconds until it was very dark. HOWEVER, the audio of the show would continue as normal. I could power off the TV for 5-20 seconds, power back on, and the video would be normal. This would occur 1-3 times when the TV was first started, and would not happen again after the TV was 'warmed up'. Not ideal, but this glitch was manageable....
    07-16-2024, 01:04 AM
  • Document Archive
    HP EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera EliteDesk 800 i7-7700 Specification for Upgrade or Repair
    by Document Archive
    This specification for the HP EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera boardview and EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our...
    09-12-2024, 02:00 PM
  • triplefour
    UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
    by triplefour
    this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
    i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
    unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
    according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
    09-13-2023, 10:43 PM
  • survivalbloke
    Macbook A2289 - backlight problems - have checked a lot already - out of ideas
    by survivalbloke
    This is A2289, board 820-01987-A. It came in with the screen not working. We could not see any image on the screen, so we ruled out a backlight issue and instead replaced the panel. The display now comes up, but no backlight.

    I didn't see any signs of liquid damage, but there was some odd looking spots around U8400. F8400 has voltage on either side of it, and I have 5v present on R8444 and R8445. I did not have 3.2v at R8442 so I figured U8400 was bad, and I replaced it. After replacement, a brief probe to R8442 showed 3.2v so I assumed I had fixed the device. After reassembly however,...
    09-12-2023, 11:44 AM
  • Loading...
  • No more items.
Working...