RCA console

[robdjf]

I will check the board. Thanks !! (Your youtube channel is great !! )

[robdjf]

Finally found some time to get back to this. It has been to long.
Well I was thinking about what ctc17 asked me about there being no green.
I tested the 21fj when I first got the set and only the blue gun looked weak it would get better when the filaments were on for about an hour and then re-checking. This was with an old beltron tester. I got a sencore 7000 and re-checked the tube about the same no g1 or hk shorts,cutoff passed,and emission hi tracking passed.
Next I found a rca test jig 10j106 and tried the chassis on the bench.
I had to make the crt plug adapter from tube base pins and a brightner socket
but it works. I have color on the test jig just turned a16 1 turn in and it locked. Great I have color-----but when I hook back up to the 21fjp22 IT is still the same as before color is all wrong.
I found pin 6 of the crt socket loose and tightened it (no good)
The crt passed the tests on 2 different testers and the chassis makes color on a test jig but they wont work together.

[robdjf]

By the way the screen is burnt in the center (dot) and my camera is crap there is green

[DavGoodlin]

Just a SWAG here, but did you degauss the 21" and check the purity rings?

[robdjf]

I did degauss the crt many times. Did not touch any neck parts yet.

[DaveWM]

purity is a must do. Dequass ground the G1s thru 100k reistors (you need 2 one for each G1). Cut off the G and B and see if you get a uniform red raster. If not you will need to do the purity setup. Be careful when sliding the yoke around with the power on. the windings can bite....

Generally if purity is a issue the colors of reg programming will be off depending on the location of the screen (so if you had a green field, some of it will be green with other areas not so much.


If you suspect Green then use the resistors to cut off the R and B guns. You can also just turn down the screen drives, but I like the resistors as I dont like constantly adj the G2 drives.

oh and start out with the G and B G1 drive pots at max, refer to the gray scale setup for the exact procedure.

be aware that adj the convergence and purity interact, so you want the purity set right 1st before spending a lot of time on convergence. You will have to adj things a few times to get the best performance.

[robdjf]

Thanks Dave I will see if I can get a good raster. I am going slowly on this set . i dont want to mess it up.

[robdjf]

The pics are red,green,and blue. (LOL)
Pic 1 g1 of green and blue grounded
pic 2 g1 of red and blue grounded
pic 3 g1 of red and green grounded
White raster fed with my leader gen.
Programming from cable box has similar results

(Do I need a 1000 amp 3 phase degaussing coil? lol)

[Phil Nelson]

The blobs of incorrect color look like classic bad purity to me. The Sams manual should have a section on purity adjustment. Work through that as Dave suggested.

Phil Nelson

[robdjf]

Well here is a pic of it after a quick purity setup and degaussing.
It gets better the longer it runs. I have been using it for about 2 hours and it seems ok at 189mA cathode current. Until it goes through a cold start and the auto gedauss is used. It kills the purity again. Unplug degauss coils and it will be fine over several startups. So I am thinking the thermistors,varistors are of the incorrect value ? Causing current flow to be to abrupt (on/off)magnatizing the crt ? The coil measures 9.6 ohms

[DaveWM]

that is odd, try putting an AC meter across the thermistor, the do a cold start, you should see AC voltage that slowly diminishes as the resistance drops while the thermistor heats up.

[ChrisW6ATV]

Originally Posted by robdjf

Well here is a pic of it after a quick purity setup and degaussing.

I like that NTSC color bars signal you have, with the unusual mid-screen split just like in the picture of the CT-100 assembly line. Can you tell me what device is generating it?

[robdjf]

The gen is a Leader LCG-396.

[Jeffhs]

Looks to me as if the TV is overscanning quite a bit. I have never seen a color bar pattern fill a round screen that much. Also, I did not see any burn marks on the CRT when I looked at your pictures of the set in operation. The ion burn must be very small, almost like a flyspeck. In any event, it isn't noticeable (at least, as I said, I don't notice it) on the pattern from the generator or on the pic of the ID screen from Syfy. It may be that the burn only shows if one looks at the picture in person and not on digital photos.

[robdjf]

The test jig has a burn in it. Not the 21fj