View Full Version : KV-1222RS Trinitron Vertical


targeteye
08-19-2017, 10:52 AM
Hello All,
I acquired this trinitron recently. It should clean up pretty good and I have the remote to go with it but I am weary of getting into a really involved project. Generally speaking are these TVs simple to service?

Turned on with nothing connected i would expect to see a full screen of static and certainly the audio works. As I change chanels you can see the singly horizontal sweep change brightness so something seems to be working :).

I'm hoping this is a common problem for these sets and you folks can give me a pointer where to check first ... an i'm hoping its an easy fix.

This TV is a perfect match for my Atari 800XL computer and i'd like to get it going again.

Thanks
Steve

Popester
08-19-2017, 02:57 PM
You'll need a schematic of this one. No vertical sweep. You could do visual check on PCB for bad solder connections. But a schematic will be a must on a Sony set. Good luck.

zeno
08-19-2017, 03:27 PM
Should be able to fix this with a good meter, schematic & a little
knowledge. Nothing comes to mind as far as common vert
problems on this set. Looks like the CRT is strong but dont
run it like that. Turn down the G-2 until you barely see a line.

73 Zeno:smoke:
LFOD !

targeteye
08-19-2017, 04:10 PM
ok... thanks guess I'll need to see about getting a service manual.

The remote dosesn't seem to work and I can't seem to figure out how to program the channels without it. :)

Steve

zeno
08-20-2017, 10:46 AM
Sony made a few sets that needed an OEM remote to add
& delete channels. They were all subbed to a big combo remote that
dealer net was abt $65 !! The manual will have an RM number
for the origional. Look on e-bay then.

73 Zeno:smoke:
LFOD !

Tom9589
08-20-2017, 11:49 AM
You may need to take your remote apart and clean the contacts. Some mysterious grunge gets on the PC board and the switches no longer work reliably. Rubbing alcohol and Q-tips work just fine. I've resurrected many an OEM remote with balky keys that way. Also be sure to clean off the back side of the polymer keyboard as well with the alcohol.

Marco-nix
08-21-2017, 08:43 AM
Here is a video od a remote control ( How to ) you'll have a good idea . On Youtube


https://youtu.be/yWpMcXWlhBE

Zenith26kc20
08-21-2017, 11:09 AM
No vertical is usually the vertical IC and some capacitors connected to it. The caps cause the IC to run hot and fail. A sure sign caps are bad, once the IC is replaced is a foldover at the top of the screen.
I remember that I had to add to the heat sink to keep the IC alive. Apparently towards the end of that IC's popularity, seconds were being sold. I had the same trouble with Zenith power supply IC's when the sets with all the shorted CRTs came along. The seconds always ran HOT!

targeteye
08-22-2017, 05:04 PM
Thanks all..

I'll give the remote a cleaning and see if it it helps.

Looks like the vertical IC is UPC1378H . Pretty cheap on Ebay. I'll order a couple to have on hand to swap it out. Sounds simpe enough.

if it fixes it then i'll shut it back off quickly and go for a recap.

Steve

Findm-Keepm
08-22-2017, 06:47 PM
No vertical is usually the vertical IC and some capacitors connected to it. The caps cause the IC to run hot and fail. A sure sign caps are bad, once the IC is replaced is a foldover at the top of the screen.
I remember that I had to add to the heat sink to keep the IC alive. Apparently towards the end of that IC's popularity, seconds were being sold. I had the same trouble with Zenith power supply IC's when the sets with all the shorted CRTs came along. The seconds always ran HOT!

With those Sonys, the chip is rarely bad - it's usually 1) the 22uf/50V cap off the yoke return - it's open, and ESR will be >10 ohms or so 2) Solder connections at the chip itself 3) Bad 24V or 28V source feeding the chip 4) the 10uF boost-up cap, also in the vertical area.

With lightning strike sets, the chip will usually short, taking out the 24 or 28V source - replacing the chip fixes that, but you wouldn't have a picture with the chip shorted. Two different versions - the UPC1378 and the UPC1488 - you have the earlier, and the caps are usually the culprit.

OP, have you checked the solder on the chip, and the presence of the 24-28V source feeding the chip?

MadMan
08-26-2017, 02:54 AM
You might be able to find the service manual online for free, do some googling.

My later model Trinitron gave me hell with cracked solder joints. I'll bet if you completely remove the PCBs and go over them with a magnifying glass, you'll spot plenty of problems. Warm up that soldering iron!