New Life Games Tech Forums

This tube is huge, 24" to 37" diag and it has this tiny 1401A monitor board driving it. The customer's 1401A board had been broken and repaired with gobs of solder all over the bottom of the board, the board had been worked on by a TV repair person who really screwed it up. I took the FBT and neck board off of the bad board and transferred them to a good working 1401A board we had in stock. This FBT had a different part number on it and I assume it is used to generate the higher voltage the larger tube needs to light up.
But MAN do I have some questions about this whole configuration before trying to power up this new arrangement.

1. On the customer's original board many of the traces around the FBT area were cut and jumpered to different places. Did the TV repair person do this trying to fix the board or is this
    a modification that needs to be done before the FBT will operate properly? Some look like factory cuts that have been there for a while and others were cuts and reroutes obviously
    done by the TV repair person. Is a 1401A board modified like this to accommodate the higher voltage FBT?

2. The 4.7uF caps near some of the PRA's are 2.2uF on the customer's original board. Are there other board modifications that need to be done to drive this larger tube?

3. Hope someone comes up with some good info on this configuration before I am forced to turn this monitor on tomorrow morning.

Question answered, I figured it out. On the RGB 1401A schematic two FBT part numbers are listed. One is for the 1401A (read 14 inch monitor) and the other is for a 2501 (read 25 inch monitor). Around the FBT on the 1401 schematic are pin numbers for the 1401 AND numbers in circles for the 2501 FBT. To convert a 1401 board into a 2501 board these connections must be the ones shown in circles. So traces have to be cut and jumpers have to be put in place to get the 2501 FBT to work in a 1401 board.