Weee! another Trash TV saved! - Page 2 - Videokarma.org TV - Video

Yamamaya42 · #16 03-10-2026, 09:31 PM

It's odd, cause when it works, it works well.
http://suzaku.live-evil.org/0310262115a.jpg

Yamamaya42 · #17 03-11-2026, 07:36 AM

What SAMS says about vert debug.
http://suzaku.live-evil.org/vert-problem.jpg

Yes, the 25v is good.

And the output IC has a history of trouble. New one ordered.

vol.2 · #18 03-11-2026, 09:12 AM

Quote:

Originally Posted by Yamamaya42

What SAMS says about vert debug.
http://suzaku.live-evil.org/vert-problem.jpg

Yes, the 25v is good.

And the output IC has a history of trouble. New one ordered.

Those era vert output ICs are generally touchy and often blow open when the caps attached to them drift too far out. They also run very hot and destroy the caps near them on the PCB, so they essentially kill themselves. Very common

Yamamaya42 · #19 03-11-2026, 02:55 PM

Quote:

Originally Posted by vol.2

Those era vert output ICs are generally touchy and often blow open when the caps attached to them drift too far out. They also run very hot and destroy the caps near them on the PCB, so they essentially kill themselves. Very common

It's oddly running cool for some reason, as in after sweep does start, and has been on for a while, shut down, grab the HS, and it's very cool.

Yamamaya42 · #20 03-12-2026, 07:16 PM

I wish this stupid TV would make up it's mind...
NOW the last 5 time or so when i have turned it on or so, I have gotten full V sweep, but I am still going to change the output chip!

kf4rca · #21 03-13-2026, 03:22 PM

Did you say CTC177? Sorry for not getting back to you sooner. Are you familiar with the legacy of these sets? It is a microprocessor controlled set. May have been the first. The tuner shields get noisy and corrupt the EEPROM data. AND it might do anything after that!. MAY not even turn on. I usually start at the EEPROM. I install a socket and put in a known good EEPROM. You should first re-solder the tuner shield on the bottom of the circuit. A CTC177? Does it have PIP and stereo? Sweet. You should probably obtain the training manual. It was printed in 1993 so it's legacy technology by now! Might be able to download it from Electrotanya.

Yamamaya42 · #22 03-13-2026, 04:06 PM

Quote:

Originally Posted by kf4rca

Did you say CTC177? Sorry for not getting back to you sooner. Are you familiar with the legacy of these sets? It is a microprocessor controlled set. May have been the first. The tuner shields get noisy and corrupt the EEPROM data. AND it might do anything after that!. MAY not even turn on. I usually start at the EEPROM. I install a socket and put in a known good EEPROM. You should first re-solder the tuner shield on the bottom of the circuit. A CTC177? Does it have PIP and stereo? Sweet. You should probably obtain the training manual. It was printed in 1993 so it's legacy technology by now! Might be able to download it from Electrotanya.

After fixing the fried power supply, it's been having no problems turning on, just getting full vertical sweep, first starting with a line, then expanding to a full perfect screen in 40 seconds, replacing caps did not seem to help it, and the day after I ordered a v-output chip, it seems to have stopped doing it...

kf4rca · #23 03-14-2026, 07:54 AM

Electrotanya has it! You should definitely download it. Tanya- what a doll! Also there are a number of TSB's for this set. After the CTC177 there should be some numbers and letters after it. RCA was the target of a class action lawsuit about this set. Very unreliable due to the tuner solder. The set is really on all the time. When you press the on button, all it does is starts the H&V scan and audio. I can see where a lightning strike nearby could scramble the data in the EEPROM. It was the new world order of TV sets at the time.

kf2dx · #24 03-14-2026, 12:20 PM

Agree 100% with Kf4rca on the tuner ground issues with these. As the miroprocessor-eprom controls everything with all service adjustments and tuner alignment via data to the LSI "tv-on-a -chip" these grounds will cause all sorts of intermittent issues. Unsolder the tuner shield on the bottom of the PCB and inspect / resolder all the tuner frame to board joints. These sets kept a lot of repair shops in business near the end of the line!

kf4rca · #25 03-21-2026, 07:47 AM

Now that you've passed CTC177 school, you are now qualified for CTC185 school.

Yamamaya42 · #26 03-23-2026, 10:40 PM

I prefer my RCA-CTC90 as far as SS TVs go :P

Yamamaya42 · #27 05-29-2026, 01:31 PM

This stupid set has gone back to the old habit of having no V sweep when first turned on and then expanding to a full perfect screen in 2-3 min, and then staying like that till shut off for a prolonged time.
I'm basically tired of messing with it as it was a free gift ( trash find), and I don't have a place inside for it yet (it's still in the garage).
So, what I'm planning to do is, hook up a filament interrupt relay (5v) on the neck PCB, off until turned on by switch on back of set, this will protect the screen from line burn before it fully has V sweep, turn on television, wait 2-3 min, hit switch to energize filaments of CRT.
This should work fine for the little that this set will be used. I have sill to find a place to put it, and a remote to use the advanced features.