LyonsArcade
Well-known member
I have a G07 that I got in unknown condition. It had a blown 901 fuse. I put the ultra super duper rebuild kit from Bob in it; a new flyback, a new hot, all new caps, two new fuses.
Powered up, looked great. So after a day, the monitor went dead. The 901 fuse was blown. So, I thought about it, and I hadn't put any thermal compound on the HOT. So I put a new hot in, with thermal compound and a new Mica Insulator.
Upon power up, it blows 901 again.
So, I thought maybe I've got a bad, new, flyback. So I checked the diodes in the rectifier area, everything's fine. I checked the voltage regulator, it tests fine and nothing's shorted out. The new hot is dead on shorted out everywhich way but sunday, both posts are shorted (I think the resistance was about 100 ohms) and the case is shorted to the ground 1 ohm resistance.
So, I removed the HOT and checked the large electrolytic caps at the back of the board that all this ties into, none are shorted. There's about 8k resistance across that bridge there (5 of them bridge two solder traces together).
I put a new HOT in with thermal grease this time, and after bolting everything in checked continuity. HOT checked good in circuit, nothing was shorted together, nothing was touching, all the insulators were installed, etc. I put a brand new flyback in, again.
Upon power up, the HOT and the fuse 901 send sparks all over the inside of the cab as they blow again!
Anybody have any idea what I'm missing here? Could it be the degauss ring?
Powered up, looked great. So after a day, the monitor went dead. The 901 fuse was blown. So, I thought about it, and I hadn't put any thermal compound on the HOT. So I put a new hot in, with thermal compound and a new Mica Insulator.
Upon power up, it blows 901 again.
So, I thought maybe I've got a bad, new, flyback. So I checked the diodes in the rectifier area, everything's fine. I checked the voltage regulator, it tests fine and nothing's shorted out. The new hot is dead on shorted out everywhich way but sunday, both posts are shorted (I think the resistance was about 100 ohms) and the case is shorted to the ground 1 ohm resistance.
So, I removed the HOT and checked the large electrolytic caps at the back of the board that all this ties into, none are shorted. There's about 8k resistance across that bridge there (5 of them bridge two solder traces together).
I put a new HOT in with thermal grease this time, and after bolting everything in checked continuity. HOT checked good in circuit, nothing was shorted together, nothing was touching, all the insulators were installed, etc. I put a brand new flyback in, again.
Upon power up, the HOT and the fuse 901 send sparks all over the inside of the cab as they blow again!
Anybody have any idea what I'm missing here? Could it be the degauss ring?