White screen TRS-80 4P Boot issue

I recently had to do an operation on my Model 4P dusting the insides, and when I powered it on again, the brightness control didn't work it didn't display any text, and the fan wasn't running. The floppy disk still lights up, and I think I can hear the processor running (I can't tell the two sounds apart)
These computers are getting really rare and expensive, what's wrong with it?
Here is a video of it http://youtu.be/r0cZhLV1SGw

Sounds like something is unplugged in there. Might be worth looking inside.

Yep... think you'll find that the front panel connectors at the front edge of the board came loose...
... and while youre back in there, make sure the FD /fd power cable isnt keeping the fan from turning.

EASY to do!

:D

It may seem like an easy operation in theory, but Tandy computers are filled with nasty surprises and way too may screws.

It's a portable luggable computer designed for a potentially rough life on the road. It has just the right amount of screws.

Those wires to the front controls (contrast/brightness/power/reset) are easy to dislodge, and where you will find your problem.

Ian.