CRTs & Insect Life - Page 3 - Videokarma.org TV - Video

YamahaFreak · #31 06-03-2012, 08:40 PM

DEFINITELY keep that set. Early Trinitrons seem to be getting harder and harder to find, and 'quad speakers' has me intrigued. Sony usually brands all of the boards in their sets, as well as adding a single or double letter board code, to make servicing easier. I really wish I could find more of these older Sonys; right now, I have a KV-2771R and a small one which I can't recall at the moment (6-inch or so CRT, with knobs)

Outland · #32 06-04-2012, 02:27 PM

I like the set. There wouldn't be any problems if it wasn't so dusty.

I could do it myself, but I need to know a few things first.

1) There are two circuit boards that extend all the way under the tube and connect to the picture controls on the other side. How do I pull these boards to see what's under them?

2) The speakers are 'isolated' and in their own little compartments. The backs extend all the way into the plastic chassis, so I have no idea how to pull them aside of removing the tube itself. How do I get access to them?

I can provide pictures if it would be helpful.

Gee, I hope the TV's okay with spending the last two nights in the garage wrapped in plastic.

I might just give it to the tech so he can deal with it.

YamahaFreak · #33 06-04-2012, 04:53 PM

Photos will certainly help (shot of the whole TV from the back, with cover off), but most CRTs from that era come apart the same general way. Usually, the mainboard in the bottom of the set just slides out, or is held by a set of plastic clips. Sometimes it is screwed down. Once whatever is holding it in has been removed, it should just slide right out. (Be careful not to snag or damage any cables connecting the mainboard to the rest of the set.) Some sets will need to have the picture control knobs on the front removed first, so the board can slide out. (You can just pop the knobs off pretty easily from the front, most of the time.) The CRT board should just pull right off the back of the CRT neck, but be gentle with it if those solder points look iffy. As for the speaker cabinet removal, photos will help there. I'm assuming there will be screws attaching the enclosures to the inside of the front panel of the set.

bills · #34 06-05-2012, 12:56 AM

I was repairing some ac units for an apt complex at home and pulled the cover off a compressor and 50 or more roaches went scurrying off.
It took years to get rid of their offspring.
Moral have the raid spray close by.
BTW this was outside the critters found their way into the house.

YamahaFreak · #35 06-05-2012, 02:45 AM

Quote:

Originally Posted by bills

I was repairing some ac units for an apt complex at home and pulled the cover off a compressor and 50 or more roaches went scurrying off.
It took years to get rid of their offspring.
Moral have the raid spray close by.
BTW this was outside the critters found their way into the house.

Reminds me of the time I went into our spa to figure out why the jet system motor kept blowing fuses. There was rust in the base of the motor. I found a bazillion roaches when I opened the motor up...maybe they caused it to seize!

I just couldn't figure out why they were living in there - I didn't think copper windings gave much sustenance. (Oh, and I was able to get the motor going again--much better than a $300 replacement!)

DavGoodlin · #36 06-05-2012, 09:58 AM

Quote:

Originally Posted by YamahaFreak

DEFINITELY keep that set. Early Trinitrons seem to be getting harder and harder to find, and 'quad speakers' has me intrigued. Sony usually brands all of the boards in their sets, as well as adding a single or double letter board code, to make servicing easier. I really wish I could find more of these older Sonys; right now, I have a KV-2771R and a small one which I can't recall at the moment (6-inch or so CRT, with knobs)

I rescued a KV2775R, now my work bench set. Looks though it has only one speaker and it was in the rain before I got it. The picture is great though.

Reece · #37 06-05-2012, 12:36 PM

I've used the leaf blower, also the shop vac in reverse with the narrow nozzle that makes a really sharp stream.

Outland · #38 06-05-2012, 11:04 PM

I tried to use a vacuum and paintbrush today, but the dust just doesn't want to move.

bills, that is exactly what I am afraid of. Thankfully, I haven't found any traces of anything except stinkbugs and dust so far.

YF; I don't want to offend you, but it seems like you may have an infestation, given that you've handled equipment with live specimens and have found them alive in your home.

I couldn't get the boards off without risking breaking something, they're too tightly set. I took some pictures.

I've been informed that one of the joints (H2 I believe) on the CRT board is broken, or on the verge. I've snapped a picture of that too.

So how am I supposed to get to those speakers/under the boards?

ChrisW6ATV · #39 06-06-2012, 04:10 AM

Yes, I would resolder that H2 connection if/when you can, and the two nearby on the same piece of foil as well.

I see screws on the speakers and a row below them (that might lead to others if there are any). Did you try removing those screws? Why do you want to remove them, anyway?

mrflex65 · #40 06-06-2012, 09:38 AM

The H1 an H2 socket pins are what supply the CRT heater voltage to the pic tube.
Other than that one pin and a couple of the resistors associated with it, it doesn't look to bad! Also, it looks like that chassis should pull right out.The wire harnesses should be all plug ins but i could be wrong

watch that 2nd anode cap as well as your going to have to discharge it before removal...

Outland · #41 06-09-2012, 05:50 PM

Sorry about not replying for a few days, I had some other priorities.

I'm probably going to send the TV off to my tech to resolder the H1/H2 and the little resistors on the CRT board, as well as to clean out the dust.

He did say that he prefers to wait until problems surface before soldering anything, which does kind of make sense (if it ain't broke...).

What do you guys think? Maybe we should just leave the solder joints alone?

petehall347 · #42 06-10-2012, 07:00 AM

i would resolder any that look bad , 2 ways to go about it . simplest and quickest is to add flux then re-flow . other way and maybe best way is remove old solder and refresh with new .

Outland · #43 06-11-2012, 10:41 PM

Hey Pete, I didn't know you were on VK! Glad to see you.

Yeah, I think I'll ask the tech to retouch them.

Chris, I missed your last response. Sorry about that.

I want to get to the front speakers so I can see if their surrounds need refoaming or not. The speakers seen in the pictures are the rear speakers. The TV has quadrophonic speakers, so there are more hiding in those compartments.

There are screws that secure the whole assembly to the chassis, but the compartment itself is too big to take out without hitting the picture tube. I have no idea how a serviceman is supposed to access them.

Maybe from the front?

Electronic M · #44 06-12-2012, 02:51 AM

Your fear of dust reminds me of that Detective monk(it would be amusing to see him try to clean that set)......That Trinitron was pretty bad, but I've seen MUCH worse in tube gear. Probably the worse was a pre-war Goodyear console that had somewhere between 1/4" and 1/2" of dust completely covering the chassis and tubes....There was also the HV cage inside my 52 Philco split chassis set. When I was a little kid I used to take apart fans and vacuum cleaners (among other things) and that Philco was several times as bad inside the cage....though come to think of it the rest was fairly aweful too...

My mom has a policy that ,unless something has been in the garage overnight or is impossible for roaches to hide in, it can't enter the house. While I understand her reasoning it can be annoying at times.....Heck I blew a good pair of Fischer speakers once trying to prove that nothing was in them, and that if there was the volume of the sound would have killed it.

I've found vacant mouse nests in at least 3 tube radios and 1 tube TV before...never fun, but usually interesting. On a good piece of equipment a serious collector just has to man-up and deal with it.

Outland · #45 06-13-2012, 02:33 PM

Monk wouldn't even touch this set. My guess is Natalie would be stuck cleaning it.

Well I decided to take it over to the tech today, so I unwrapped it from it's plastic, stuffed it in the car, drove over to find...

...that he's closed for the day.

Now the plastic part surrounding the picture tube is bent in a few places, all for nothing!

Oh well, it's ok. I'll just have to wait until I can find another time to take it over.