 |
|
Only on Defender you will see a bunch of ?????? in the area where you normaly see numbers in the setup screen. This error is caused by the 5101 CMOS chip, the only 22pin chip on Defender CPU board.
1) The most common problem is a bad 5101.
2) The next most common problems is the socket used to replace
the 5101 or broken traces
under the 5101. You may want to ohm out the pins to the 5101 and make sure
that they are actually connected.
3) Next in line is the signals going to the 5101 are bad or missing.
Pins 19 and pin 20 of the 5101 are the control signals
to the 5101. If on or both of these are bad you will also get the ??????
error.