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Recap Guide - 12” RGB Monitor (M1296)

Posted by: TimHD on 2020-09-19 07:19:13 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 View attachment m1296-repair-recap-rev-2.xlsx.pdf

Posted by: techknight on 2020-09-19 08:16:07 Nice info. but I like pics too. im a very visual person. 🙂

Posted by: ironborn65 on 2026-01-04 10:26:38 I possibly caught an error in the list: cap C420 is not the electrolytic one, the correct ID is C404

Posted by: ironborn65 on 2026-01-04 14:59:11 I made this picture while recapping the same monitor. I hope it can be useful. The caps I found leakinf were the C521, C417, C418, C517 This is the table ID Value Notes C401 1uF 50V C404 25uF 220V C413 1uF 50V C414 100uf 50V C416 22uF 25V C417 2200uF 35V prone to leaking C418 2200uF 6.3V The community is suggesting 10V prone to leaking C501 47uF 50V C502 1uF 50V C507 10uF 50V C512 100uF 100V prone to leaking C517 100uF 25V prone to leaking C518 10uF 160V C519 220uF 25V C520 10uF 50V C521 82uF 160V prone to leaking C522 10uF 50V C523 1uF 50V C525 0.1uF 50V C526 47uF 50V C908 220uF 450V C914 22uF 100V C915 10uF 100V C919 330uF 180V C920 2200uF 35V C921 10uF 100V and grouped by value: Capacitance Voltage Count IDs 0.1 µF 50 V 1 C525 1 µF 50 V 4 C401, C413, C502, C523 10 µF 50 V 3 C507, C520, C522 10 µF 100 V 2 C915, C921 10 µF 160 V 1 C518 22 µF 25 V 1 C416 22 µF 100 V 1 C914 25 µF 220 V 1 C404 47 µF 50 V 2 C501, C526 82 µF 160 V 1 C521 100 µF 25 V 1 C517 100 µF 50 V 1 C414 100 µF 100 V 1 C512 220 µF 25 V 1 C519 220 µF 450 V 1 C908 330 µF 180 V 1 C919 2200 µF 6.3 V 1 C418 2200 µF 35 V 2 C417, C920 Despite taking the best effort possible, I don't guarantee it's error-free

Posted by: ironborn65 on 2026-01-15 00:16:12 Updating the thread. I've replaced the C418 cap with one with the exact capacitance and a few more around the vertical sync, which showed a weak ESR and loss. Namely them all: C414, C526, C404, C523, C522, C512, C418, C519, C517, C921, C920, C519 Now it's fully working. Another device was restored and preserved. 🙂

Posted by: leonlas on 2026-02-01 05:27:25 Hello. The D920 diode in my monitor is damaged. It has no markings, it's glass with a single black stripe. Which diode should I use?

Posted by: ironborn65 on 2026-02-01 06:04:43 @leonlas , I'm sorry, I can not tell

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