Rca ctc-125/xl-100

[footlooseman]

I found this RCA CTC-125/XL-100 a few months ago out by the street with a free sign and thought I would rescue it and as of today I am finally getting around to it.
WP_20150222_011.jpg
The TV kind of works but whenever I go to change the channel the screen go black, a noise pops up, and the wattage goes down to about 12 watts. Is the flyback bad or some other components causing the issue?

Please see video.

http://youtu.be/oOVTukIIaNE

If it’s not an easy fix maybe I should just scrap it out for parts.

[zeno]

Most common problems with these are the
main filter can which usually gives an hour glass
or Christmas tree effect & cold joints in the tuner / control
boards. Also may have a little choke by the flyback that is
cold like its bigger brothers had. Try some light tapping
around first..... Also see if the filament is going out, that
will tell you if the HV is dying. I doubt it, the current
should drop to near zero if it were.

73 Zeno

[Findm-Keepm]

Like Zeno said, check the solder connections at T401, the horizontal driver transformer, and also, as a rule, we changed out the 75V zener (CR110) in the start-up circuit. RCA had a goldenrod (troubleshooting aid) that called out that zener in 90% of the start-up troubles.

[zeno]

Originally Posted by Findm-Keepm

Like Zeno said, check the solder connections at T401, the horizontal driver transformer, and also, as a rule, we changed out the 75V zener (CR110) in the start-up circuit. RCA had a goldenrod (troubleshooting aid) that called out that zener in 90% of the start-up troubles.

Oops forgot about the Zener. Unfortunately the 3 sams for CTC125
I dont have. No training manual either.
The coil I was thinking of fed the MSC & was for tuning voltage
IIRC. Not sure if these had it but I think it was CTC120's
had a bunch go cold.
Worth some time, twas a good set & dont take up much room
or eat to much.

73 Zeno

[Findm-Keepm]

Originally Posted by zeno

Oops forgot about the Zener. Unfortunately the 3 sams for CTC125
I dont have. No training manual either.
The coil I was thinking of fed the MSC & was for tuning voltage
IIRC. Not sure if these had it but I think it was CTC120's
had a bunch go cold.
Worth some time, twas a good set & dont take up much room
or eat to much.

73 Zeno

Zeno,

I too am blind, not having the Sams either. I do have my late fathers' notes from 44+ years of servicing sets. He documented alot - some of it is almost indecipherable without either the set or Sams. He references stuff like "on the board, near the fly, but behind the horiz tranny sink" and "like some of the small neck XLs, but without the Knight neck" - the last is a reference to a set he accidentally necked while working on it for another shop, Knight TV. He ate a 175 dollar bonded yoke CRT, all to help a friend. Dad had a whole second language for his beloved TVs..

I've got his griplet maps for GE EC/AA/AB/AC sets - now there is a well-worn page. We were lucky to have GE sets saturated in this area in the 80s, so he stayed busy with the GE sets until the white flyback NAP sets and the CTC175-185 tuner ground sets became the moneymakers. Funny how the TV business went in waves - first it was the RCA 6GH8/5GH8 sets, then the early XLs, then the early System 3s, then the Colortrak start-up woes, then the GE griplet sets, and on and on. He finished out his years in business working the RCA CTC203 and M134 chassis, and the ever-present sets with the bad jungle or Vertical output ICs. Each year or so he entered a new "era" of sets.

Cheers,

[zeno]

Sounds like your father was a true TV man with
it in his blood.

You are 100% on there always was a set to keep you
in business another year after the big slowdown. You
have good examples. A few more good ones were Sharp
FBT's, Sony IF boards, Toshiba TA8680 IC's & any 4.7 mfd
cap in a 200 V supply.
You bring back some great memories of a big part of my life.

73 Zeno

Originally Posted by Findm-Keepm

Zeno,

I too am blind, not having the Sams either. I do have my late fathers' notes from 44+ years of servicing sets. He documented alot - some of it is almost indecipherable without either the set or Sams. He references stuff like "on the board, near the fly, but behind the horiz tranny sink" and "like some of the small neck XLs, but without the Knight neck" - the last is a reference to a set he accidentally necked while working on it for another shop, Knight TV. He ate a 175 dollar bonded yoke CRT, all to help a friend. Dad had a whole second language for his beloved TVs..

I've got his griplet maps for GE EC/AA/AB/AC sets - now there is a well-worn page. We were lucky to have GE sets saturated in this area in the 80s, so he stayed busy with the GE sets until the white flyback NAP sets and the CTC175-185 tuner ground sets became the moneymakers. Funny how the TV business went in waves - first it was the RCA 6GH8/5GH8 sets, then the early XLs, then the early System 3s, then the Colortrak start-up woes, then the GE griplet sets, and on and on. He finished out his years in business working the RCA CTC203 and M134 chassis, and the ever-present sets with the bad jungle or Vertical output ICs. Each year or so he entered a new "era" of sets.

Cheers,