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      Discuss your latest vintage Mac finds!

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      • dcr
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  • Posts

    • Interesting story - that I am almost reliving. Yes, I also was looking to get 180c for a long time, and  I got one recently for low offer. Mine was in better shape - no leaking battery. Hinge screws ripped out, burned electrolytic caps on inverter (?) board, hard drive with click of death - but the flex cable is in one piece. I glued hinge to screen bacl wall with epoxy, replaced burnt caps, backlight works, but the screen stays blank (white).   I tested and confirmed continuity of all traces on flex cable, checked with scope that there are some live waveforms on flex cables leading to LCD glass from screen logic board, so seems something is fed to the glass, but not even shade of grey pattern or mouse pointer is visible.   What make me wonder is that voltage on wide (power?) trace of flex cable is only 2.3V - I would think at that time the lowest voltage used was 3.3V. If yours screen is still opened and accessible, could you check what is supply voltage is fed to LCD on yours working system. Thanks
    • Note: I wonder if the admins could create a Repairs or Recaps forum so that we can collate and capture knowledge like the below before it is lost. 
        https://jbretro.wordpress.com/2019/07/10/m1296-recap/   The aim of this post is to create a reference online of capacitors used in the main and neck board of the Apple 12″ Macintosh Monitor (M1296).  Attached is a spreadsheet of capacitor values that has been created by the writer and verified / checked for accuracy and show photos of the recap.
      This monitor’s design has the front bezel match the curve and width of certain Macintosh computers, famously the LC line and also IICI.  It is a fixed resolution 512 x 384 @ 60 Hz RGB monitor which used composite sync.  Internally it is a Japanese design by Matsushita and uses a shadow mask CRT tube.  It is not compatible with traditional analogue RGB video signals, even when fed clean C-SYNC.   I found the build quality to be strong and pleasing to repair.  My monitor featured vertical collapse when turned on and was known to have little use from new, cosmetically perfect and from a single owner in Sydney, Australia.
      Capacitor C418 was the failure point for me, along with rotted traces from heavy capacitor leakage.  The main board was indeed wet and electrolyte pooling in the grooves of the case.   I chose to re-cap everything including the neck board as clearly I felt like a challenge.  After repairing some traces and verifying my work, the monitor was tested as working ‘first go’.  The image remains pristine – clear, converged well and bright.   PDF spreadsheet M1296 Repair Recap rev 2.xlsx (attached)   Apple 12″ Macintosh RGB Monitor M1296 Main board uF V C401, C413, C502, C523 1 50 C416 22 25 C418 2200 6.3 C420, C519 220 25 C501, C526 47 50 C507, C520, C522 10 50 C512, C414 100 50 C517 100 25 C518 10 160 C521 82 160 C525 0.1 50 C908 (Comment: Negative Black) 220 450 C914 22 100 C915, C921 10 100 C919 330 180 C920, C417 2200 35 Neck board uF V C203 1 50 C205 220 100 C206, (C517 from main board) 100 25 C2B4, C2G4, C2R4 2.2 50 C2R2,C2R1,C2G1,C2B1,C2G2,C2B2 47 25 C6B5, C6R5, C6G5, C207 1 160 C6R3, C6G3, C6B3 47 25 m1296-repair-recap-rev-2.xlsx.pdf
    • What was the mechanical issue, the thickness of the ROM SIMM?   I ended up swapping the socket on a couple of my logic boards (somewhat invasive but worth it to me) and made a video on how to do it:    
    • @Trash80toHP_Mini Nah, people should know who they're dealing with. Not the first time I've seen this behavior from "Intertial".   Has anyone pulled the trigger on this new SCSI drive replacement? I was thinking of getting another SCSI2SD, but I want to try the MacSD to see how it compares. It seems like it could be a game changer, but currently there's unfortunately little info about it.
    • From reading around and seeing prior issues, this would appear to be a Vertical IC failure. Thanks for the help. 
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