itsvince725
Experienced Member
I recently acquired a TRS-80 Model 4P in rather rough exterior condition, but after some cleaning with an air compressor the internals were in surprisingly good shape. However, when I try to power it on the tube does not light up and the disk drives do not seek. Here is a picture showing how the unit is indeed on but the screen is completely dark:
https://i.imgur.com/JRW3aHi.jpg
It was sold to me this way and I had assumed it was due to a loose internal connection, but even after I opened the unit up, checked every connection I could find, and firmly reseated all the socketed chips on the motherboard, it still does not give a raster or seek the disk drives. I'm not overly familiar with the hardware of the TRS-80 (I have a regular Model 4 that is also faulty, but that one at least displays a raster) so I don't really know where to start in diagnosing this.
https://i.imgur.com/JRW3aHi.jpg
It was sold to me this way and I had assumed it was due to a loose internal connection, but even after I opened the unit up, checked every connection I could find, and firmly reseated all the socketed chips on the motherboard, it still does not give a raster or seek the disk drives. I'm not overly familiar with the hardware of the TRS-80 (I have a regular Model 4 that is also faulty, but that one at least displays a raster) so I don't really know where to start in diagnosing this.