Riddled TV Repair Forum
Service Menu and Manual Schematics
 
   
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Proscan 50" Rear Projection CRT    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
 
Author Message
Shock



Joined: 28 Jun 2010
Posts: 2
Location: Canada

PostPosted: Mon Jun 28, 2010 10:50 pm    Post subject: Proscan 50" Rear Projection CRT Reply with quote



This is my parents TV and they are a bit hesitant to throw it out. It's an older 50" Rear Projection CRT TV that has served them well.

One day, the picture suddenly became very dark with a bit of distortion at the top edge. The colors are all messed up with red & blue overpowering everything and the greens the most faded. It doesn't seem like there is any "white" being added to the picture that needs to balance it out as it's all really dark. It almost looks like a negative picture.

Any ideas what this could be? Is there a bulb or lamp that is burned out? I also hear you need to replace the coolant fluid in the color lamps sometimes. Could it be this?

What I can't figure out is why the picture from cable, DVD, AV in, etc. are all like this, but the menus are all fine and sharp and full color. If it was a color tube that was physically out or something was damaged, shouldn't everything on the TV be messed up or is the menu system projected by an alternate system?
Google

PostPost subject: Advertisement

JTS1957



Joined: 21 Jan 2009
Posts: 2347
Location: Far, Far Away

PostPosted: Tue Jun 29, 2010 2:48 am    Post subject: Reply with quote

Shock wrote:
older 50" Rear Projection CRT TV


Any one in particular?
Shock



Joined: 28 Jun 2010
Posts: 2
Location: Canada

PostPosted: Tue Jun 29, 2010 4:54 pm    Post subject: Reply with quote

It is a Proscan 50700 from around 1998.

Here are more images of what the picture looks like. If the OSD is on different RGB pins of the IC, aren't both images projected from the same tubes? I haven't disassembled the TV yet to take a look at the physical tubes. I am moderately okay with basic electrical/electronic/mechanical things but I've never worked on a TV before and wouldn't know where to start.

Any ideas what the culprit behind this is and if it is worth fixing? Could it be as simply as coolant fluid replacement?

Display posts from previous:   
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair All times are GMT - 6 Hours
Page 1 of 1

 


Disclaimer: All information provided by RiddledTV is strictly for information purposes only. Please observe all warnings displayed on your electronic
devices. This information should only be used to help diagnose work, and all service should be performed by a qualified technician.
Contact Us       Privacy Policy       Copyright © 2015 RiddledTV.com       Advertise on RiddedTV.com