Sylvania TV color problem

Reply

  #1  
Old 04-01-18, 10:41 AM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
Sylvania TV color problem

I have an old Sylvania 32' T.V. model # is SRT2232S that has been giving me a fit because the color goes out or changes to purple or even Black and White. I've got the back off and I have been tapping on a small circuit board located at the center of the back. each time I tap it will change the color but now I can't get it to stay correct anymore. Any help would be appreciated, Thanks Fritoguy15
 
Sponsored Links
  #2  
Old 04-01-18, 10:23 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,490
Received 216 Votes on 205 Posts
That would seem to suggest an intermittent solder connection. It could also be a loose connector. I'd start by inspecting the solder on the connectors first.
 
  #3  
Old 04-02-18, 07:22 AM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
There are some loose small black connectors on that board and when I move them the color goes in and out but still not correct. I don't have a solder gun to do anything with it. I also misstated that it was a 32" it is actually a 25" I have a Digital Multimeter, could I test anything with that?

Fritoguy15
 
  #4  
Old 04-02-18, 07:40 AM
Bob14525's Avatar
Member
Join Date: Jun 2013
Location: USA
Posts: 1,463
Upvotes: 0
Received 11 Votes on 8 Posts
I doubt the multimeter will help you with this (although it's a handy device to have around). As Pete mentioned, it's almost certainly a bad solder joint or intermittent connector. You can purchase a small soldering iron kit, including solder (don't buy a soldering gun, it's too high a wattage) from Amazon.com for ~$15. I used to do TV repair work years ago, and bad solder joints were a common problem.
 
  #5  
Old 04-02-18, 08:18 AM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
I will look into that kit and see if I want to attempt it. Thanks

Fritoguy15
 
  #6  
Old 04-02-18, 02:59 PM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
Originally Posted by fritoguy15 View Post
I will look into that kit and see if I want to attempt it. Thanks

Fritoguy15
I found a 30W kit at Walmart, or a 25W kit at Lowes. I wondered if the watts are ok?

Fritoguy15
 
  #7  
Old 04-02-18, 03:32 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,490
Received 216 Votes on 205 Posts
A 25-30 watt soldering iron kit is perfect.
 
  #8  
Old 04-03-18, 04:45 AM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
Thank you for all your help. I'll get one today and try to fix it. will let yo know.

Fritoguy15
 
  #9  
Old 04-03-18, 07:30 AM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
I have a picture of the back of the T.V. and was wondering if it can be removed or not to make the solder connection easier?
Name:  20180403_095339 (2).jpg
Views: 89
Size:  86.9 KB
 
  #10  
Old 04-03-18, 08:10 AM
Member
Join Date: Dec 1999
Location: Cleveland, OH USA
Posts: 557
Upvotes: 0
Received 0 Votes on 0 Posts
I am no TV repair expert but aren't there some pretty high voltage capacitors on those old tube TV's that he should be careful with? I guess if he got this far he might be OK but still...

- Peter
 
  #11  
Old 04-03-18, 08:19 AM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
it's the little black pins behind the scotch tape that are loose. I see some cracks on the solder connections.

Fritoguy15
 

Last edited by fritoguy15; 04-03-18 at 09:04 AM. Reason: Want to add information
  #12  
Old 04-03-18, 09:59 AM
Bob14525's Avatar
Member
Join Date: Jun 2013
Location: USA
Posts: 1,463
Upvotes: 0
Received 11 Votes on 8 Posts
Yes, you can remove the CRT socket/circuit board. Pull straight back on the board, while wiggling it slightly. While there is high voltage (25+KV), it is only on the anode (heavy wire connecting to terminal on back side of the CRT). Obviously, you want to unplug the TV before removing the CRT socket/circuit board. The socket is keyed, so it will only go back on in one direction.
 
  #13  
Old 04-03-18, 10:04 AM
Bob14525's Avatar
Member
Join Date: Jun 2013
Location: USA
Posts: 1,463
Upvotes: 0
Received 11 Votes on 8 Posts
If you see cracks in the solder, you've found the problem. If you've never soldered before, here's a quick tip. Once the soldering iron is hot, put the tip of the iron on the joint you want to re-solder. Leave the tip of the iron on the joint for a second or two and then apply your solder to the joint itself, not directly on the iron. The solder should melt and flow around the lead. Once the solder has melted and flowed around the lead, remove the iron. Too much heat on the joint will cause the copper circuit trace to pull away from the circuit board substrate.
 
  #14  
Old 04-03-18, 10:16 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,490
Received 216 Votes on 205 Posts
When I looked up the model number I though I got an LCD TV. That's an older TV with a tube.

It would be very strange to find your problem on that board. That is the focus and color gun connection to the tube. You could see loss of a single color of one of the three color guns. You wouldn't see black and white as that is not controlled there.

Purple would mean a loss of green.

Resolder all the wire connections and those three green resistors.
 
  #15  
Old 04-03-18, 02:50 PM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
I resolderd all the cracked connections and let it cool down, I still have black and white, so I guess it's time to get a flat screen
 
  #16  
Old 04-03-18, 03:54 PM
Member
Thread Starter
Join Date: Feb 2002
Location: Central Florida
Posts: 160
Upvotes: 0
Received 0 Votes on 0 Posts
I have an update, I have color now. I guess my solder fix worked. I really appreciate all the help here. My little $10 solder gun worked. Much cheaper than a new TV or repair service.
 
  #17  
Old 04-03-18, 04:58 PM
Bob14525's Avatar
Member
Join Date: Jun 2013
Location: USA
Posts: 1,463
Upvotes: 0
Received 11 Votes on 8 Posts
That's great news, congrats! It's a rewarding feeling when you can repair something yourself. Thanks for letting us know how you made out.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes