Q102 keeps blowing on rebuilt 6100

Robran68

Well-known member

Donor 2011
Joined
Feb 17, 2008
Messages
3,619
Reaction score
36
Location
Fraser, Michigan
Ok, I rebuilt this thing with Bob's standard kit and a LV6100 along with double checking for cold solder joints throughout all the boards. The monitor worked great and then I did a burn-in test over night in a Tempest. So, I go to check on it in the morning and all it had was some graphics in bottom left corner and the spot killer was off still and heard chatter. Found q102 to be bad and replaced, powered it on and kills the new one! :mad:

Anybody have any idea what went bad?
 
Did you install it properly? Disconnect the red connector on the deflection board that connects to that transistor and see if the transistor forms a short between the casing or any of the pins. If so, it is shorting out to the frame and you either need a new socket or better installation. Obviously this only works after you install a new transistor as the fried transistor will not test properly. That is the power transistor. Did you follow the flow chart?

http://gamearchive.askey.org/Video_Games/Manufacturers/Atari/monitors/wg_color/wg6100-fc.pdf
 
Did you install it properly? Disconnect the red connector on the deflection board that connects to that transistor and see if the transistor forms a short between the casing or any of the pins. If so, it is shorting out to the frame and you either need a new socket or better installation. Obviously this only works after you install a new transistor as the fried transistor will not test properly. That is the power transistor. Did you follow the flow chart?

http://gamearchive.askey.org/Video_Games/Manufacturers/Atari/monitors/wg_color/wg6100-fc.pdf

I did a continuity test on it before firing it up and it was installed correctly. I did follow the chart but it doesn't really show an issue like I'm having. I did meter some stuff out on the deflection board and did find D700 open but it's in series with D701 so I'm not sure this would happen because of that. I'm not too hip with reading schematics yet...:eek:
 
Make sure that the case of the 2n3716 dose not touch the chassis. There should be heat sink paste and a mica insulator between the transistor and the chassis. Also the socket can move as you screw them together. Continuity should not be present on either of the pins or case(collector) of the transistor.
 
Last edited:
Make sure that the case of the 2n3716 dose not touch the chassis. There should be heat sink paste and a mica insulator between the transistor and the chassis. Also the socket can move as you screw them together. Continuity should not be present on either of the pins or case(collector) of the transistor.

I checked to make sure it wasn't shorted to the frame. Did a continuity check with the MM.
 
Might want to reflow the red green and yellow and blue purple and white wires at the sockets of the frame mounted transistors. If the transistors test good


Andrew
 
Back
Top Bottom