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

Yamamaya42 · #1 03-04-2026, 09:29 PM

I did not really want it, as it was solid state, but when my friends offered it, I was not gonna refuse.
http://suzaku.live-evil.org/79377184...81A401108.jpeg

It's a RCA CTC-177

And its DEAD Jim!

No power no nothing!

found a DEAD short on the HOT, but to my surprise, the transistor was NOT blown, but the 140V line to it was shorted DEAD.

http://suzaku.live-evil.org/blownaaa.jpg
Fried diode.
and open cap.
The regulator might be fried too, not sure.
Oh and the thermistor is GONE, waiting for a new one.

Yamamaya42 · #2 03-06-2026, 09:43 PM

I was right! the regulator is TOAST! replaced the shorted diode, not sure why it let go, new caps C4107/C4105 and still DEAD set. 180V on pin 1 of T4101.
so much for this IC being self protecting.

Yamamaya42 · #3 03-07-2026, 07:49 PM

It's alive!

http://suzaku.live-evil.org/20260307_191504.jpg

Replaced the regulator, and it powered up.

Still not 100% yet, when it first came on, there was no vert sweep, then it slowly filled the screen.

More bad caps.

Yamamaya42 · #4 03-08-2026, 01:14 AM

As mentioned, it does work. eventually!

http://suzaku.live-evil.org/0308260040.mp4

Yamamaya42 · #5 03-08-2026, 11:21 PM

SAMS was very poor with the parts list on this set, many of the caps are not shown on the list, so I'm having to guess at the voltage rating, or just pick something way over.

http://suzaku.live-evil.org/caps.jpg

I can't really see what's in there, and want to get them BEFORE i pull them out...

vol.2 · #6 03-09-2026, 08:44 AM

Quote:

Originally Posted by Yamamaya42

SAMS was very poor with the parts list on this set, many of the caps are not shown on the list, so I'm having to guess at the voltage rating, or just pick something way over.

http://suzaku.live-evil.org/caps.jpg

I can't really see what's in there, and want to get them BEFORE i pull them out...

I usually just pull the whole board, take out each cap one by one and make a spreadsheet of the cap number, voltage, value and temp. In any case, the Sam's (or the schematic) can be wrong, or there could be revisions. You always want to replace with what was originally in the set, not what's on the Sams if there is a disagreement. So it's best practice to pull it and go one by one.

Your video definitely shows bad caps around the vertical IC. You have that telltale vertical linearity issue where the scan lines unravel towards the top of the raster

Yamamaya42 · #7 03-09-2026, 09:51 AM

Just about to place order for caps from Mouser, guessing the voltage value from what was seen on the schematic, most seemed to be 63v, ordered 100v, hopefully what was shown on the schematic are the correct values UF wise, if not, I can just re-order and have them in a day.

Yamamaya42 · #8 03-09-2026, 09:59 AM

Quote:

Originally Posted by vol.2

I usually just pull the whole board, take out each cap one by one and make a spreadsheet of the cap number, voltage, value and temp. In any case, the Sam's (or the schematic) can be wrong, or there could be revisions. You always want to replace with what was originally in the set, not what's on the Sams if there is a disagreement. So it's best practice to pull it and go one by one.

Your video definitely shows bad caps around the vertical IC. You have that telltale vertical linearity issue where the scan lines unravel towards the top of the raster

Also in the power supply, vertical has a dedicated feed line from the FBT, with 2 caps on it, 25v line I think, I have never seen a TV do what this does before, start with no V sweep at all, then expand to full screen after 40 seconds or so,

Username1 · #9 03-09-2026, 09:00 PM

.

So what happened to Dr. Smith??

.

Yamamaya42 · #10 03-10-2026, 11:47 AM

Quote:

Originally Posted by Username1

.

So what happened to Dr. Smith??

.

Major West reluctantly brought him back in so he could endanger the J2 another day!

Another annoying thing about this set is, it has AV inputs, both composite and svhs, but w/o a remote, you can't select it for input.

vol.2 · #11 03-10-2026, 12:01 PM

Quote:

Originally Posted by Yamamaya42

Major West reluctantly brought him back in so he could endanger the J2 another day!

Another annoying thing about this set is, it has AV inputs, both composite and svhs, but w/o a remote, you can't select it for input.

should be able to solve with either a universal remote, or an app.

a lot of older cell phones have an IR blaster, so if you can find a model for cheap (or just have one hanging around in a drawer) then you might be able to side-load a universal remote app on it and use that

i've got a samsung galaxy S6 with an IR blaster that I did this for many years ago, although I'm not completely sure how to locate the software anymore. when I did it, the S6 was still only a generation old or so

Electronic M · #12 03-10-2026, 06:57 PM

Quote:

Originally Posted by Yamamaya42

Major West reluctantly brought him back in so he could endanger the J2 another day!

Another annoying thing about this set is, it has AV inputs, both composite and svhs, but w/o a remote, you can't select it for input.

You mean S-video....SuperVHS (SVHS) is a videotape format with extended luminance resolution. S-video (S standing for Separate) is a video cable/connector standard where the luminance and chrominance components are sent via separate coax leads to avoid repeated luminance chrominance mixing and comb filtering.

Sorry to be pedantic, but it really bugs me when I see someone I consider smart mix them up.

vol.2 · #13 03-10-2026, 08:52 PM

Quote:

Originally Posted by Electronic M

You mean S-video....SuperVHS (SVHS) is a videotape format with extended luminance resolution. S-video (S standing for Separate) is a video cable/connector standard where the luminance and chrominance components are sent via separate coax leads to avoid repeated luminance chrominance mixing and comb filtering.

Sorry to be pedantic, but it really bugs me when I see someone I consider smart mix them up.

It was very common to hear people refer to s-video as SVHS in the early days because that's the format that it was essentially created for in the marketplace. If you knew what s-video was in the 1980s, chances are it was because you had or knew aobut SVHS decks.

I think it just persisted and it doesn't bother me at all.

Yamamaya42 · #14 03-10-2026, 09:02 PM

Replacing caps helped nothing at all.

seems it may be a bad TDA8172, though I have never seen one act like this before, not work for the first few moments and then start to work after 40 sec.

Yamamaya42 · #15 03-10-2026, 09:04 PM

Quote:

Originally Posted by vol.2

It was very common to hear people refer to s-video as SVHS in the early days because that's the format that it was essentially created for in the marketplace. If you knew what s-video was in the 1980s, chances are it was because you had or knew aobut SVHS decks.

I think it just persisted and it doesn't bother me at all.

https://www.youtube.com/watch?v=7neNVN-k4tQ