elfyhead
New member
moved from the sticky - mods can remove my post there if needed.
so i've had this DK3 sitting in my garage for more than a year now, waiting for me to fix the monitor on it (after a long saga back then of trying to get it fixed but only partially succeeding). so i finally got some time to work on it.
it started out with washed out colors, couldn't sync, and couldn't quite focus.
so i first did the bob roberts cap kit (deluxe version). pic was then pretty good, but wavy. reading here it seemed like that's a B+ problem, and sure enough B+ was stuck at 82V and i couldn't adjust it with the pot.
i ordered IC601 and Q901 from riptor, and i had a B+ pot replacement from bob roberts from the previous attempts at repair.
i put those in last night, and now i've got a short somewhere. 0V and diode beep right at the AC input on the board (AE and AF). grrrrrr.
turns out that was because the fuse at the 120V AC had burned out. replaced that, and turned it on, and the AC fuse on the chassis flared and burned out. tried a new fuse, since the fuse that was in there was old, same result. double grrrrr.
i've gone over the solders on the three new components, and they're all good (to my eye at least).
it might be a bad diode in the bridge circuit, but how could putting in those other three components cause that?
any help is appreciated.
i really do hate this monitor.
so i've had this DK3 sitting in my garage for more than a year now, waiting for me to fix the monitor on it (after a long saga back then of trying to get it fixed but only partially succeeding). so i finally got some time to work on it.
it started out with washed out colors, couldn't sync, and couldn't quite focus.
so i first did the bob roberts cap kit (deluxe version). pic was then pretty good, but wavy. reading here it seemed like that's a B+ problem, and sure enough B+ was stuck at 82V and i couldn't adjust it with the pot.
i ordered IC601 and Q901 from riptor, and i had a B+ pot replacement from bob roberts from the previous attempts at repair.
i put those in last night, and now i've got a short somewhere. 0V and diode beep right at the AC input on the board (AE and AF). grrrrrr.
turns out that was because the fuse at the 120V AC had burned out. replaced that, and turned it on, and the AC fuse on the chassis flared and burned out. tried a new fuse, since the fuse that was in there was old, same result. double grrrrr.
i've gone over the solders on the three new components, and they're all good (to my eye at least).
it might be a bad diode in the bridge circuit, but how could putting in those other three components cause that?
any help is appreciated.
i really do hate this monitor.