My RCA rear projection TV has worked well after help from you TV
service people in January, 2005. It has
a chassis number of PTK195AC and is model P60812BL

At that time I found that the surface of the PC boards had some of the
coolent and other debris which I cleaned and that fixed the problem.

Coming home from vacation today, the main fuse from the AC input
failed. Upon replacing it, the convergence is all messed up. I went
into the service mode using the front panel as the service manual
describes, I can't seem to get the grid pattern that I got back in
2005. Can anyone tell me

1. What typically goes wrong when the main fuse blows and the picture
goes out of adjustment

2. How do you get into the built-in geometric alignment grid pattern?

I am into the service mode, but it does not seem to have any pattern
except the Pfor parameter) and V (for parameter value): on the
screen.

I would like to nurse this TV along for a while. It has given good
service and I have no reason to replace it other than the present
problem. I really don't want to get into it deeply. For example, I
would prefer NOT to get a chipper checker or have to hook an
oscilloscope to it.

sci.electronics.repair