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Recap Guide - 12” RGB Monitor (M1296)


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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

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