What was found
NO LED AFTER 20 MINUTES OF FLIGHT. ALSO WENT DEAD, AFTER SHUTOFF FOR 5 MINUTES NO LED BUT COULD T/R ON LOST SET FREQUENCY. FOUND DISPLAY BOARD BURNT. REPLACED DISPLAY BOARD. NO HELP. REPLACED TRANSISTOR Q507. NO HELP. REPAIRED OPEN RUN FROM COLLECTOR OF Q503 TO LEG 1 OF TRANSFORMER T501. STILL NO DISPLAY. REPLACED DIODES CR504 AND CR505 AND TRANSFORMER T501.REPAIRED. ADJUSTED SQUELCH AND SIDETONE. TOUCHED UP FACEPLATE WITH BLACK PAINT. BENCH CHECK GOOD.