Help! I think I hosed my Defender Video board.

jeff412

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I got a new Defender that had a broken connector on the Video board, so I pulled the one out of my working Defender to test. In the process evidently I bumped the working board against something and bent some of the transistors at the bottom of the board. This caused some of the legs to touch. When I plugged it in nothing happened. I thought I had something wrong with the new cabinet. When I put it back in the working cabinet. It no longer worked. I then checked the board and found the bent transistors. After getting them separated it still doesn't work. I get the initial Williams sound when I turn it on, but no video. What could I have burnt up with those transistors shorted?

Jeff
 
Depending on the board and which transistors, it sounds like you shorted something in the reset circuit. If you can look on the component placement diagram in the Defender Drawing set and narrow down the transistor you played with, we can probable give you a more definitive answer.

ken
 
Those are the main components of the reset circuit. If one of them fried open, they are going to hold the RESET line on the CPU and the board will look dead. All three are 2N4401 transistors. You should be able to get those almost any electronics store, even Radio Shack has them. They are pretty cheap so, I'd replace them all, just in case.

ken
 
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