telmnstr Posted September 19, 2019 Share Posted September 19, 2019 Grabbed some Atari systems from a non-profit I'm involved with to test. They were donated to the org (a music and gaming festival.) First up, Atari 1040ST. Hooked it up to my color ST monitor, powered on. Red LED for a brief second then dead. Pulled cover, PSU fuse blown. Replaced with another 2A/250V fast blow, pulled power cable from the main board and powered it on again. Blew fuse brightly! Checked for dead shorts on caps. One of the ceramic resistors reads shorted but it's probably just low ohm. Nothing seems shorted on the one transistor, and poking the diode bridge showed nothing dead shorted. Recap is the usual first thing... will start there. I will log my findings here ? Quote Link to comment Share on other sites More sharing options...
telmnstr Posted September 20, 2019 Author Share Posted September 20, 2019 Capacitor C4 was shorted. 250v 47uf. Replaced with something close enough to test. Machine posts to GEM! Seems like the monitor connector is either making poor contact to the DIN plug or there could be broken solder joint. Will need to pull the board and reflow the connector pins I think. Will tackle that the same time I fully recap the PSU. As an owner of a 520ST and Mega 2, I really like the 1040ST over the 520ST quite a bit. The integrated floppy and PSU make it much better. Quote Link to comment Share on other sites More sharing options...
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