1. Home
  2. Electronics Repair
  3. Sony KV-27V36 has weird PIP issue.

Sony KV-27V36 has weird PIP issue.

This Sony KV-27V36 was working fine until about an hour ago. When I turned on the PIP, it initially looked fine. Then I did a few exchanges of channels from the small window to the big window. I noticed the smaller window was showing just static. I thought the cable had gone out for that station because the larger window was still showing a clear picture. I hit the switch button again and the problem still stayed with the smaller window. So now I know that it's not the cable. There are only two choices in the setup menu (not talking about the service menu) for cable channel select. They are "on" or "off" and it's set to "on." To summarize, all the channels work properly when the PIP is not active or if the PIP is active and you're looking at the larger window. The smaller PIP window will work fine until you reach channel 48. From channel 49 and above, it's all static. I'm fairly certain that the way the two tuners operate is that they each stay on the same station when you hit the switch button. All that changes is where the pictures are displayed. Is that correct? If not, it would make sense that one of the tuners is having tuning issues though I'm not sure what's so special about channels 48 and above. The information I've researched doesn't show those two channels (48 and 49) are situated on different bands. Any ideas?

Thanks for your reply.

--
David Farber 
Los Osos, CA
Reply to
David Farber
Loading thread data ...

I would say it is the tuner itself. Might respond favorably to resoldering...

Used to see lots of problems like this.

Mark Z.

Reply to
Mark Zacharias

On Tuesday, December 11, 2012 4:10:49 AM UTC-5, David Farber wrote: I hit the

The Sonys of that era used two tuners for main and pip, but didn't swap the video between large and small windows, but swapped the channel instruction s for each tuner as the swap button was pushed. That's why the problem sta ys with the particular screen window.

Those tuners were combo tuner and IF, and are known to have issues with gro unds and bad connections on coils. You can replace the pip tuner if you ca n find one, or pull it and resolder. Some of those TVs in that era used do uble sided boards, and require a decent technique to pull the tuner (green boards). If it has the brown board, it's an easy pull. BTW, although the tuners look identical but they're not, so make sure to identify the correct one by pulling the RF input lead off each tuner to confirm the pip goes to snow.

Reply to
John-Del

Hi Mark,

Here I thought I would never again have the pleasure of resoldering a Sony tuner/IF module. (-:

Thanks for your reply.

--
David Farber 
Los Osos, CA
Reply to
David Farber

Hi John,

Knowing that the channel instructions are swapped instead of the tuners does make this job easier. I'll be sure to mark the bad one before I pull it.

Thanks for your reply.

--
David Farber 
Los Osos, CA
Reply to
David Farber

I pulled out the tuner and resoldered it. There was nothing out of the ordinary that I saw. A few of the connections were beginning to crack but nothing I saw that would have caused a failure. Anyway, I put it all back together and it's still going to snow at channels 48 and above.

--
David Farber 
Los Osos, CA
Reply to
David Farber

The connections that give the most trouble are the grounds both around the board perimeter, and the posts that poke through the pc. There's not a lot of ground redundancy in those tuners, so a single ground connection will c ause problems. Deflux the board till it shines, get a bright light, use ma gnification, and reflow the board again. Don't overlook the small can coil connections.

Reply to
John-Del

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.