imac 21 2011 109-C29557-00 vga common issue

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • rookieme
    Badcaps Veteran
    • Oct 2014
    • 396
    • Greece
    #1

    imac 21 2011 109-C29557-00 vga common issue

    So I've noticed that some imac 21" 2011 vga has a common issue that make the system reboot of just shut down.
    This is not a gpu chipset issue, cannot be fixed by replacing chipset and sometimes it appears after replacing chipset [due to usually faulty 216-0810005].
    So far I have tried reballing vrams, replacing Q601,Q611 & C838.
    Has anyone faced and fixed this issue?
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: imac 21 2011 109-C29557-00 vga common issue

      Did you confirm it is indeed caused by the graphics card?
      https://logi.wiki/index.php/iMac_A13..._Graphics_card
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • rookieme
          Badcaps Veteran
          • Oct 2014
          • 396
          • Greece
          #3
          Re: imac 21 2011 109-C29557-00 vga common issue

          Yes as I've seen the issue to follow the card to a second imac

            Comment

            • thodoris10
              Member
              • Mar 2014
              • 15
              • Greece
              #4
              Re: imac 21 2011 109-C29557-00 vga common issue

              Originally posted by rookieme
              Yes as I've seen the issue to follow the card to a second imac
              Did you manage to fix the problem ?
              I 'm just facing the same issue for a second time with this specific card

                Comment

                • rookieme
                  Badcaps Veteran
                  • Oct 2014
                  • 396
                  • Greece
                  #5
                  Re: imac 21 2011 109-C29557-00 vga common issue

                  this kind fix is waste of time, no hope when issue occurs
                  after so much time no progress with figuring out the issue

                    Comment

                    Previous template Next

                    Related Topics

                    Collapse
                    • Stephen
                      iMac 27” 2020 Boot issue
                      by Stephen
                      Customer came in for data recovery, came to find out data is soldered on to this iMac (learn something new everyday) this is a 2020 T2 iMac so I was surprised because the iMac Pro has a T2 chip and it isn’t soldered on. Anyways, the iMac boots to Apple logo and then restarts, before it turns off you hear a quarter fan spin then it repeats itself. I decided to do a DFU revive to restore any hardware firmware issues and it was successful in reviving the device however the issue persists in boot looping. It shows the Apple logo for like 40 seconds then turns off and fan spin rinse repeat. I...
                      08-16-2024, 09:32 AM
                    • Stephen
                      iMac M1 DFU restore issue
                      by Stephen
                      iMac turns on no drops no cracks, tried to DFU Restore the iMac, logo turns on great! however iMac turns itself off and then restarts to the (!) icon and won't post the restore. Tried thunderbolt 3 cable, tried regular USB C cable and nothing.

                      this is the message it gives me with the error

                      Unexpected device state 'DFU' expected 'RestoreOS' (Probably forced into DFU mode externally) [com.apple.MobileDevice.MobileRestore – 0xFAE (4014)].


                      Any thoughts what this could be? I will open it up and repair it but I am not 100% sure since this iMac doesn't...
                      03-07-2025, 12:19 PM
                    • reformatt
                      Intel iMacs, 3rd party SSD failures and Fusion setups
                      by reformatt
                      I thought I'd throw out some of my personal experiences in the last 12 months with Intel iMacs, 2.5" SATA SSD drives and Fusion drive data recoveries.

                      As a backgrounder, Apple never fitted a 2.5" SSD's to these iMacs. Apple's SSD option was a system of 32GB NVMe blade drive (NGFF connector) and Seagate 1TB 2.5" HDD, married together in software to become a Fusion drive. Non Fusion systems have just the 1TB Seagate HDD.

                      So, the most common reason an iMac comes across my bench is because it's either ridiculously slow, or it fails to boot at all. The most...
                      12-18-2024, 10:34 PM
                    • howardc64
                      A1312 (27” iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                      by howardc64
                      Problem

                      This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                      08-04-2024, 10:36 PM
                    • roman728
                      iMAC A1418 Backlight issue
                      by roman728
                      Hello friends,

                      I have this unit with no backlight on screen. After inspection i determined there is a shorted capacitor on BKL_BOOST circuit. I removed the capacitor, short is gone but backlight still not working. I found that Q9702 is not open and R9721 is only around 70kOhms but according to schematics it should be 301k. I removed the resistor and connected the gate of Q9702 directly to GND. Now i have 12v passing by the mosfet to turn on backlight IC LP8561 (U9700) but BKL_BOOST circuit is not working. I can measure only 12V there but it should be around 60V.

                      Can you...
                      04-10-2025, 11:48 AM
                    • Loading...
                    • No more items.
                    Working...