Sony PVM-2950q Color Problems...

I picked up a Sony Trinitron PVM-2950Q monitor from a local university surplus office for $50. The picture looks good overall except one thing, the colors don't seem to be quite as crisp and bright as they should be. I have been messing with the different picture settings but nothing seems to get it quite right. The best way to describe it would be, if you are looking at a solid color block... say in a cabinet color test menu... the left portion of the block is a brighter shade of green, but it fades rather abrupty to a more dull green within a few centimeters as it moves to the right. From that point on, the color is consistent... but it is the uglier green color that is consistent. I am trying to track down a service manual for it to see if there is an internal color adjustment I can do, or would a replacement capacitpor kit fix it.

I am currently using an xbox with s-video as my input source. It also supports RGB and component, but I don't have anything like that to test with right now. Any help would be appreciated or at least a point in the proper direction for service info.

Thanks

Sounds like the 180 volt video drive supply electro cap may be at fault.

Look for about a 10uF 250 volt electrolytic, maybe on the main pcb near the lfbt or perhaps the crt base board, you can check the voltage on the collectors of the rgb output transistors, should be around 180 volts with the brightness turned right down, if its much lower then its almost certainly the cap.

You can usually see where they have leaked onto the board, try moving the cap, often one leg breaks loose due to corrosion.

Cool thanks, I will give it a look.

What is a lfbt ?

Another part that I forgot to mention is that the picture has a slight pink hue to it when you first turn it on if it has been powered off for a while. It starts to gradually go away after it warns up for a bit, but the dull colors are still noticable even after the pink hue goes away.

Black IcE said:

Another part that I forgot to mention is that the picture has a slight pink hue to it when you first turn it on if it has been powered off for a while. It starts to gradually go away after it warns up for a bit, but the dull colors are still noticable even after the pink hue goes away.

Click to expand...

A flat CRT takes time to warm up, if the tube has low emission you may be flogging a dead horse. Slow warm up (of one or all colours) and a washed out low contrast pic is an indication.

lfbt = line flyback transformer, if your not familiar with monitor servicing (which I guess is the case to ask the question) its probably a good idea to leave it alone rather than risk a shocking experience

So I have a sneaky suspision it would be best to just get what life I can out of the screen as is, instead repairing it. I have worked on a couple commodore
64 monitors but that is about it. I have had plenty of electrical/trouble shooting experience as I have been a copier technician for about 4 years. But if you recommend not messing with it, then i will go from there. Thanks.