Hello all,

At the moment I am using a copy of Larry Pina's 'The Dead Mac Scrolls'. It has a large section about early Macs (128k, 512k and Plus).

The problem I am having starts a page 21: 'The Mac does absolutely nothing. There is no startup bong. There are no unusual noises. The display is dark.

For this problem Mr Pina recommends:

Checking the in-circuit resistance of CR5 to asses the health of the flyback transformer. The resistance I measured was 0.04 (?).

Checking the in-circuit resistance of CR21. If the reading is 0/0 replace with heavy duty MBR360 rectifier. The resistance I measured was 0.03 (?).

Check/replace resistors R46, R47, R49 and R50.

When the Mac exhibits a 'flup flup flup' noise it is recommended that CR20 is replaced with a heavy duty MBR1045 rectifier.

I think it would be beneficial for me to replace CR20 and CR21 as the ones on my analog board don't look too healthy!

Hopefully the replacement parts suggested by Mr Pina are compatible with the International 240v analog board!

Any suggestions would be much appreciated!