Flickering red in Sony KV-1311CR

[Phil Nelson]

After 20+ years of regular service, my beloved Sony KV-1311CR TV/monitor has developed a problem. It's like the red gun completely flickers out. Sometimes it comes back on in a flickering way, and then the picture is fantastic again. Adjusting user controls (Color, Hue, etc) has no obvious effect.

Is this a typical symptom that the CRT is giving up the ghost? I haven't hauled it back into the workshop to test the CRT yet.

This is the original CRT, so i guess it wouldn't be remarkable if it's finally dying. In that case, Where Oh Where would I look for replacement? It's such a perfect size for my office desk that I hate to give it up. About a year ago, I fixed a video problem by replacing some electrolytics.

The photo shows the TV when it was working properly. I just included it to give a general idea what model this is.



Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[zeno]

Resolder the 3 video outputs on the CRT board & check the
whole board for bad PC cons. That will fix 95% of em.

CRT unlikely, usually will short & go one color with retrace
lines then full shut down. Low emission is progressive. If
a Sony this age gets it the raster will flash on/off.

This is a good set, keep her going !

73 Zeno

[Phil Nelson]

Thanks for the tip! The flickering does seem consistent with an intermittent connection.

Regards,

Phil Nelson

[jr_tech]

Cleaning the CRT base pins might also help.

jr

[andy]

...

[lnx64]

I think that TV uses the same CRT as my PVM, which looks nearly identical.

[Jon A.]

Sweet monitor, got to keep my eyes open for these in the free ads and the one thrift shop here that still carries CRTs.

[Phil Nelson]

Originally Posted by zeno

Resolder the 3 video outputs on the CRT board & check the whole board for bad PC cons. That will fix 95% of em.

You mean the little board that plugs onto the CRT base, right? (Board C in the Sams manual.)

Cleaning CRT pins didn't magically cure the flicker. I have begun checking the board. Haven't found any obvious bad connections yet, but it will take a while to go through this board.

Phil Nelson

[zeno]

Originally Posted by Phil Nelson

You mean the little board that plugs onto the CRT base, right? (Board C in the Sams manual.)

Cleaning CRT pins didn't magically cure the flicker. I have begun checking the board. Haven't found any obvious bad connections yet, but it will take a while to go through this board.

Phil Nelson

Yup thats the board.

[Phil Nelson]

After checking & finding loads of good connections, I looked at that tiny pot labeled R BKG (background) and wondered if it might be a tad funky. I rocked it back and forth a little and returned it to the original position. Looks like our red is back.



I'll play it on the bench for a while to make sure the cure sticks.

I would love to keep this guy going. The CRT seems a little slower to light up than when it was new, but otherwise it's a pleasure to watch. I pipe the audio to a KLH bookshelf speaker, so it sounds swell, too.

Thanks!

Phil Nelson