It should have been a simple job. Intermittant drop out. Look inside powered
up and the ps fan is obviously defective, so fits the symptoms. Fit a
replacement and power up and not a dickie-bird. No led flicker or fan kick.
Undo the ps and obvious dropper solder problem underneath. Sort that out and
still nothing by monting on pillars. Checked for topside mixer and power
side earth continuity if that is required. So what else have I disturbed?
close inspection reverse-side looks fine, topside is heavily populated and
very few solder points can be seen. Continuity to the pa monitoring
thermistor good.
Enough power gets to the main bridge rectifier for startup supplies but the
relay does not click over that shorts out the droppers for full mains
current, let alone anything else.