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-   -   Weird problem with Sony KV-20FV12 (http://www.videokarma.org/showthread.php?t=265989)

dieseljeep 02-04-2016 11:42 AM

Quote:

Originally Posted by Electronic M (Post 3152473)
Dude...It's just a 15 year old BPC!...I can go out any day of the week and get 10 working ones just like it for free....Hell when I see a BPC on the curb I don't even test it (if I even stop), but instead just rip out everything except the cabinet and CRT to use as parts for mid 70's and older sets that actually have some value.

You might be seeing more "curbside setters" as Best Buy quit taking in TV's and computer monitors for recycling, free. They now going to charge $25.00, just like others do.

jr_tech 02-04-2016 12:13 PM

So after resoldering the board conenctions, cleaning the crt pins, the cathodes took a bit of running at normal voltages to recover? :scratch2:

jr

old_coot88 02-04-2016 12:28 PM

That's as good a explanation as any.

Dude111 02-05-2016 04:03 AM

Quote:

Originally Posted by old_coot88
.....Don't know how long it will last, though.
Screen shot attached.

Excellent!!!

I hope she is happy now and will give you excellent quality for along time :)

old_coot88 02-05-2016 09:39 AM

Yeah, hope so too. When it was doin' the original 'cycling' act, there was no perceptible change in the heaters' normal healthy orange glow. A "Lazarus" CRT is real puzzler for sure.

zeno 02-05-2016 06:28 PM

Newer sets do some strange crap. I had a few of this vintage Sony
with a small ( H & V ) & messed up raster. Who would suspect a bad tuner ?
The data line to the tuner would short & none of the IC's such as
the jungle would get the preset data from the E-prom. So you had to
change the tuner / IF & it just cost too much. Odds are it was a
chip in the tuner shorted but probably a SMD & not available.
BTW to trouble shoot just unsolder the CLOCK, DATA & ENABLE
pins at the tuner. If it gives a full raster its the tuner.......

73 Zeno:smoke:


Quote:

Originally Posted by old_coot88 (Post 3155757)
Yeah, hope so too. When it was doin' the original 'cycling' act, there was no perceptible change in the heaters' normal healthy orange glow. A "Lazarus" CRT is real puzzler for sure.


kf4rca 02-06-2016 07:45 AM

Have to remember that one. Thanks.

old_coot88 01-22-2017 07:16 PM

A question for Zeno
 
Zeno, you being the resident Sony guru, lemme pick your brain a bit. The jug in this Wega KV-20FV12 is starting to get a little soft again. Before I think about pulling the back again, is there a heater series resistor? I can't find a schematic anywhere showing the CRT area. Presumably the resistor would be on the CRT socket board.

I know some other brands had 'em. Having retired from the repair trade in 1986, I'm not overly knowlegable on newer stuff.

Findm-Keepm 01-22-2017 09:41 PM

Quote:

Originally Posted by old_coot88 (Post 3177092)
Zeno, you being the resident Sony guru, lemme pick your brain a bit. The jug in this Wega KV-20FV12 is starting to get a little soft again. Before I think about pulling the back again, is there a heater series resistor? I can't find a schematic anywhere showing the CRT area. Presumably the resistor would be on the CRT socket board.

I know some other brands had 'em. Having retired from the repair trade in 1986, I'm not overly knowlegable on newer stuff.

3.3 ohm 2W resistor, R718 or R71B, depending on how the CRT board is marked...off pin 7 of the CRT socket.

old_coot88 01-23-2017 12:30 AM

Wow, thanks. May be able to milk the old jug a while longer now. :tresbon:


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