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F32TF600YX1 is "green with ill" for a moment then OK, See these photos please.

B

BWL

Jan 1, 1970
0
I've seen several (older) RCA's do this on startup. The tube is producing
enough emission to slightly light the tube before the vertical circuit has
started, then the vertical starts, giving the all over screen w/ retrace,
because the video circuits aren't on yet. Try turning the screen control down a
little and see if this still happens.
 
J

Jason D.

Jan 1, 1970
0
Got this tv (F32TF600YX1) in our shop and saw this odd behavior when
it is running the picture quality is like any other good TV except two
things customer's complaint on this problem and it is not right and
I'm stuck on this, had seen all kinds of bad CRTs except like this.
Is it bad CRT or something else?

First photo is the turn on point, at instant of power button pushed
blurry distorted greenish horizontal line pops up YET the heaters is
still cold to emit electrons this early on as shown in this photo:

http://www3.sympatico.ca/jpero/tv/greenlineRCA.jpg

That line is hard to catch because I had to time my cam at right time
to snag this unique problem.

Then 1 or 2 seconds later:

http://www3.sympatico.ca/jpero/tv/illRCA.jpg

Futher few seconds later now snapped up light grey screen then finally
normal picture appears in a snap. Just like that. Click click click,
no gradual appearances. The lines of these photos are very vage and
blurry not the way I took, this is exactly what I see for real.
Remember picture when up is sharp and correct color balance.

The green dot on CRT's face is the green LED reflected off from a test
equipment (Belkman's monitor test image generator).

Did measurements and checked boards. Nothing looks nothing unusual.

Thanks!

Cheers,

Wizard
 
L

Lionel

Jan 1, 1970
0
Kibo informs me that [email protected] (Jason D.) stated that:
Got this tv (F32TF600YX1) in our shop and saw this odd behavior when
it is running the picture quality is like any other good TV except two
things customer's complaint on this problem and it is not right and
I'm stuck on this, had seen all kinds of bad CRTs except like this.
Is it bad CRT or something else?

First photo is the turn on point, at instant of power button pushed
blurry distorted greenish horizontal line pops up YET the heaters is
still cold to emit electrons this early on as shown in this photo:
[photo]

Both photos show normal behaviour by the scanning beam during startup,
but which are normally suppressed. A CRT can't show anything unless the
heaters are emitting electrons, therefore your heaters must, logically,
be hot enough to be emitting /some/ amount of them, even if it isn't the
full amount, QED.
As to the fault, given that your beam is green, I'd be first checking
the blanking circuit, & comparing the signals on the green section vs
the other two. I suspect that you'll find that there's a time delay
circuit that triggers the blanking circuit during start up, & that
there's some sort of problem with it.
If you can't find a problem there, you might try applying a colour-bar
test pattern, & start looking for problems on the neck-board, but that's
just a hunch.
 
J

Jason D.

Jan 1, 1970
0
I've seen several (older) RCA's do this on startup. The tube is producing
enough emission to slightly light the tube before the vertical circuit has
started, then the vertical starts, giving the all over screen w/ retrace,
because the video circuits aren't on yet. Try turning the screen control down a
little and see if this still happens.

Cough... Note that "fault" appeared instantly when turned on and I did
said the heaters was still too cold to emit electrons at all.

The CRT gun assembly is same in all of those 25-32" RCA CRT and this
can't be like this since this CTC203 *does* not have AKB like I have
in this flat crt tv with this fault. this is what I'm wondering why.

I knew RCA design does this, horizontal runs first then vertical
starts up, been this way for years since '177.

Cheers,

Wizard
 
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