You would both probably be better-off if TetrisMaster512 were right. A good wash so that the MLB can be inspected for corroded-through traces, followed by the replacement of malfunctioning caps, may give a more positive conclusion. Failing that, you could elect to tear apart the PSU (with due respect for its filter capacitors' remnant charge) and test/replace/augment the bias diode in the sawtooth oscillator, because that could be the cause of the 'it-works-after-removing-the-PSU-for-a-while' syndrome. But before you bung your trusty 4-lb. iron on the charcoal brazier, do search these forums using 'IIci', 'Delta', 'Astec' and 'TRKL' as your search terms. You will find much discussion and some external references of potential use.

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