Thread
Picture: Mac Se,My Video Board is bad...
this is what its doing, if i swap the video board on the back of the tube with a working mac,
it works fine, i already re-soldred all the connections on the back... nothing looks cooked...
Any suggestions?
it works fine, i already re-soldred all the connections on the back... nothing looks cooked...
Any suggestions?
Have you tried checking all the connections with a volt ohm meter?
Since you have a working specimen, if they are identical, try comparing them. Make sure none of the diodes have reverse bias, the resistors match ohms (this depends on their tolerance range), and the capacitors are within range.
It is not that complicated of a board, so use a paper clip affixed solid to a test probe on one end to check all the pins on the power connection, the electron gun pins, all the traces, and all the components.
Since you have a working specimen, if they are identical, try comparing them. Make sure none of the diodes have reverse bias, the resistors match ohms (this depends on their tolerance range), and the capacitors are within range.
It is not that complicated of a board, so use a paper clip affixed solid to a test probe on one end to check all the pins on the power connection, the electron gun pins, all the traces, and all the components.
your video output transistor circuit is bad for sure.
check the output transistor for shorts, and nearby resistors for opens.
check the output transistor for shorts, and nearby resistors for opens.
ok thanks... yeah that sounds simple enough, at least it somewhat works 
gives me hope!
ill do a compare!
gives me hope!
ill do a compare!