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1983 Colortrak TV Has Picture But No Sound. Will This Work?

post #1 of 24
Thread Starter 
As the title says, I have a picture but no sound. There was a surge the other day when my microwave went out. Somehow it overloaded the circuits and blew out my audio amp in the TV, I'm guessing.

Can I cut the speaker wires off of the internal speakers, put electrical tape over them, then run a set of speaker wires to an amplifier, such as this: http://www.amazon.com/LP-2020A-Lepai-Tripath-Class-T-Amplifier/dp/B0049P6OTI/ref=cm_cr_pr_product_top - then run the RCA cables out to my DVDR and play the sound that way? It's a really old TV and I sure do love it. I should probably get another TV, but I'd like to fix this one, if I can.

The speakers have power to them and work, there is just no sound. I tried to strip back one side of an RCA cable to get to the positive and negative wires. I plugged the left into my DVDR and touched them to the speaker. It blew a fuse. The next time it sparked. The speakers have 2 prongs extending back from where the wires are soldered on, so I'm not sure what they are there for. As a side note, the TV has no other connections, other than an RF input with the old style antenna hookups for UHF and VHF.

Any help I could get would be appreciated. I do have a surround system that I can get the sound through out of my DVDR, but I like playing the TV without having to turn on several devices just to get sound.

Sorry if this is too long-winded, but I wanted to provide some details so as not to generate too many unanswered questions.

I don't know the model number because the sticker is gone on the back. There is a wiring diagram on the inside for a tech but I'm not sure if the model number of the TV is there.

Thank you,

Mark

P.S. If it helps, there appears to be 3 or 4 circuit boards in the TV, plus the RF tuner box, as opposed to the Thompson layout.
post #2 of 24
Quote:
Originally Posted by Mark33634 View Post

Can I cut the speaker wires off of the internal speakers, put electrical tape over them, then run a set of speaker wires to an amplifier, such as this: http://www.amazon.com/LP-2020A-Lepai-Tripath-Class-T-Amplifier/dp/B0049P6OTI/ref=cm_cr_pr_product_top - then run the RCA cables out to my DVDR and play the sound that way? It's a really old TV and I sure do love it. I should probably get another TV, but I'd like to fix this one, if I can.

The speakers have power to them and work, there is just no sound.

Yes. Be careful with the volume though as that's a 20 watt/channel amp and those speakers may only be rated to 5 or 10 watts. If the TV is mono/1-speaker check the DVDR manual to see which RCA to connect to and if any menu settings need to be made for mono output.
post #3 of 24
Thread Starter 
Thanks, Floydage for the reply.The speakers are stereo. I was going to try to use speaker wire to rca connectors and connect the speakers to the audio in of one DVR and plug the outs into another set of outs, but I don't know if that would work, so I just ordered the amplifier.

Mark
post #4 of 24
Quote:
Originally Posted by Mark33634 View Post

Thanks, Floydage for the reply.The speakers are stereo. I was going to try to use speaker wire to rca connectors and connect the speakers to the audio in of one DVR and plug the outs into another set of outs, but I don't know if that would work, so I just ordered the amplifier.

Mark

You're welcome.
I don't know what that means but it doesn't sound like it would work. In any event a DVDR's audio outputs can't drive a speaker without an amp in between (and a speaker's very low impedance may be nearly a short-circuit to the DVDR's audio outputs). In general if a device doesn't have speaker terminals labeled for speakers it doesn't have the power to drive speakers (i.e. typically RCA connectors aren't used as speaker terminals).
post #5 of 24
Thread Starter 
Thanks again, Foydage. I came across something else that I hadn't read: that is, that some have audio sync problems between the TV picture and the speakers. I don't seem to have that problem with running RCA plugs to the DVDR and another surround system. I don't see what would be the difference. If that is the case, then the purchase would be in vain, and only good for audio applications, that is, to hear music form an iPod or other kind of audio device.

Mark
post #6 of 24
Too bad the TV doesn't have a video input to better sync the video with the audio. Should be OK since it's OK with the surround system unless the new amp has a huge delay or the surround system has a bigger delay than the new amp.
post #7 of 24
Is there a particular reason on why you want to fiddle around with a 30 year old tv when you can easily find a replacement on craigslist for $25? The phosphors on that thing must be at/near end of life.
post #8 of 24
Thread Starter 
mhufnagel,

The picture is pristine. I believe that at the time I bought it, the salesman told me it had 700 plus scan lines. I've looked at some LED Smart HDTV's, but this one works fine. I really wish I knew how to get the sound back. It would probably cost an arm and a leg to get a TV technician to diagnose and fix it, even if he could get the parts. What I have now is basically just a good monitor. I don't know if I could get this same TV on Craigslist.

Mark
post #9 of 24
Quote:
Originally Posted by Mark33634 View Post

mhufnagel,

The picture is pristine. I believe that at the time I bought it, the salesman told me it had 700 plus scan lines. I've looked at some LED Smart HDTV's, but this one works fine. I really wish I knew how to get the sound back. It would probably cost an arm and a leg to get a TV technician to diagnose and fix it, even if he could get the parts. What I have now is basically just a good monitor. I don't know if I could get this same TV on Craigslist.

Mark

I had a fantastic 19" Zenith from 1982 that lasted until 1996. The power switch was going and, for me, it wasn't worth fixing.

You're right that you won't be finding your set on craigslist. But I've seen plenty of late-90, early 2000 Sony's and Panasonic's in the $25 - $40 price range. And those sets have very fine pq quality too. As a matter of fact, if you look long enough, you can find a crt hd set for under $50.
post #10 of 24
I gave a basic/mono RCA 19" about that vintage to charity about a year ago, still had a great pic, might have been a Colortrak. My first new TV was a 19" Colortrak of the same vintage, also great pic but fancier in that it had one of the first keypad/digital tuner displays; it died long ago but it gave many years of heavy use. We're probably showing our baby-boomer ages here. biggrin.gif

I've seen a few of the oldies on craigslist, usually the free section and consoles (heavy/moving issue so can't sell 'em). Probably depends on one's market; D/FW here is a huge market for this stuff but often lots of driving in this sprawled out metroplex unless one lives near the generous $ areas.

Oh yeah, the vast majority of my CRTs and computer monitors were freeeeeeee. A flat widescreen 34" HD (Panasonic Tau - great set), a flat 27" HD (with built-in HD tuner), a nice 20" flat Sony, a little kitchen TV with buit-in VCR that actually works (oh boy!), and bringing up the rear a few 19" 'spares' (only one left - gave the rest away to charities). Also some nice computer monitors including this Dell flat pro CAD I'm staring at. The only one left that I paid for is a '93 GE 27" that I use as a picture&picture to my 34" HD.

Mark if you consider a replacement CRT keep an out out for these Sonys:

http://en.wikipedia.org/wiki/FD_Trinitron/WEGA

I monitor CL for that 960/N near the top of the list, pretty much the ultimate of the last flat widescreen HD CRTs as it has a higher resolution tube (Super Fine Pitch or SFP) than the others including the last Sony HD CRT the 970 (I think that one was a cost-reduced model but still a great TV). HD tuner, HDMI, etc. Almost 200 lbs. though. 0 - $200 depending on condition, original remote control, and stand but with patience I'm thinking more around $50 (someone with $ that just bought a new flat panel just wants to get rid of it and it will cost them money to get it moved promptly > wife influence wink.gif ).

Of course there's the big 4:3 sets there to consider too if you mostly watch 4:3 material. Then there's the monster 40" which actually gives 37" widescreen, but for me needing 3 people to carry it is just pushing the envelope too far. eek.gif
post #11 of 24
Quote:
Originally Posted by Floydage View Post

Mark if you consider a replacement CRT keep an out out for these Sonys:

http://en.wikipedia.org/wiki/FD_Trinitron/WEGA

Very nice chart, I'll bookmark it for reference.

Thanks! smile.gif
post #12 of 24
Thread Starter 
Thanks, Floydage and also mhugnagel for the information.

The TV I have is a large console TV, a 26" or 27" display. I really have no way to get rid of it. If I did, I'd get me this TV: http://www.walmart.com/ip/VIZIO-E420d-A0-42-1080p-120Hz-Class-3.32-ultra-slim-LED-3D-Smart-HDTV/22659938?action=product_interest&action_type=title&placement_id=irs_middle&strategy=PWVUB&visitor_id=49264418116&category=0%3A3944%3A1060825%3A447913&client_guid=44e66aa1-5924-45c8-8382-2b6420787c91&config_id=0&parent_item_id=22061194&guid=891ffc4a-d683-4633-8a0a-3ab06b5df5d4&bucket_id=000&findingMethod=p13n#Product+Reviews

I ordered a small amplifier and speaker wire. I will for sure unplug the set before cutting the speaker wires. If a capacitor is not discharging properly, how much current do those wires carry? As I said earlier, directly behind, and coming out from where the speaker wires are soldered on the speakers, there are 2 prongs on each speaker, extending out from the solder points. My intention is to wire the speakers there and just let the other speaker wires lay in the chassis with electrical tape over them. There is no chance of losing the picture if I cut those wires, is there? The RF box and the speakers seem to be all hooked up into the same little box.

If this doesn't work, I'll probably just buy the above TV. I'm just being practical. I don't really watch too much TV: only the news and a few of my favorite Sci-Fi shows. I really do like my TV though.

I appreciate the information here. smile.gif

Mark
post #13 of 24
Quote:
Originally Posted by Mark33634 View Post

I ordered a small amplifier and speaker wire. I will for sure unplug the set before cutting the speaker wires. If a capacitor is not discharging properly, how much current do those wires carry? As I said earlier, directly behind, and coming out from where the speaker wires are soldered on the speakers, there are 2 prongs on each speaker, extending out from the solder points. My intention is to wire the speakers there and just let the other speaker wires lay in the chassis with electrical tape over them. There is no chance of losing the picture if I cut those wires, is there? The RF box and the speakers seem to be all hooked up into the same little box.

Nothing to worry about there, just avoid contact with the big red or black wire that comes off the side of the picture tube.
It should work fine. Your audio appears dead anyway.
You could also hook up that amp to a small pair of external speakers like computer speakers, etc.
post #14 of 24
Thread Starter 
Thanks, Floydage. I appreciate it. We'll know when my orders come in. I'll try to update to let you know how it went. smile.gif

Mark
post #15 of 24
Thread Starter 
Floydage,

I have an Alesis RA-100 Amplifier, powering 2 Alesis Monitor One speakers. It's a 4 channel amp. It has 2 intuts and 2 outputs. It is for only 2 sets of speaker wires, left and right. I have my audio from my PC running into the inputs and the 4 wires running to the speakers. I have no idea what the outs are for. I read briefly about parallel and series wiring. I'm not sure If I could use this amp. I assume that if I hooked up my TV s speakers to this amp, every time I played music or sound from my PC, it would also play through the TV speakers, and vise versa. Am I correct in this assumption? How would I even to it with only 2 speaker wire inputs? Hope this is not too much information to ask someone, but I do already have a really good amp.

Mark
post #16 of 24
It's not a 4 channel amp if it only has two speaker outputs. Maybe you meant 4 ohm. Or maybe they meant something weird like 4 inputs mixed to 2 outputs. Yes all sound would be shared to the same set of speakers assuming it could input both PC and DVDR.
post #17 of 24
Thread Starter 
Thanks, Floydage. I'm not real literate about amps and the verbiage associated with them.

I thought as much about the speakers. frown.gif

Mark
post #18 of 24
Thread Starter 
I have one more question: since my speakers apparently have power going to them, can I run speaker wires from them to RCA Inputs of my DVDR? As I stated in the original post, when I have just 1 channel hooked up to an out of my DVDR and touched the wires to the posts sticking out from the speakers, it blew a fuse, and a couple of other times sparked. I don't want to take a chance of ruining my DVDR's input doing that. Is that too much current going to the speakers from the TV to try? I do have the amp on the way, but I also have a couple of left-right speaker wires with left-right RCA plugs on them. I'm not really sure why the speakers sparked and blew a fuse. Can you comment, please?

Mark
post #19 of 24
Reread post #4.
post #20 of 24
Thread Starter 
Sorry, Floydage for the double-question. Thank you.

Mark
post #21 of 24
Thread Starter 
Floydage, (What is a Floydage?) smile.gif

I just hooked up the speakers to the amp. Everything went off without a hitch. Instead of wiring to the prongs, I cut the speaker wires and spliced into them. I first did the battery test to determine which one was positive and the negative. After that, all was a go. I put wire nuts on the other wires that I had cut.

I still have to run the TV speakers out of my DVDR, but at least I have them again. Since there is no video out on the old set, I know of no other way to make the speakers play when the TV is turned on.

Should I leave the amp on all the time? It says it has protection for the speakers when it is turned on to protect from volume spikes. I'm pretty sure the speakers always had power to them from the TV, even when it was off. I'm not sure that the constant turning on and off of the speakers won't damage them.

I appreciate your sticking with me and answering all my questions.

Take Care,

Mark
Edited by Mark33634 - 9/27/13 at 9:33am
post #22 of 24
Quote:
Originally Posted by Mark33634 View Post

Floydage, (What is a Floydage?) smile.gif

I just hooked up the speakers to the amp. Everything went off without a hitch. Instead of wiring to the prongs, I cut the speaker wires and spliced into them. I first did the battery test to determine which one was positive and the negative. After that, all was a go. I put wire nuts on the other wires that I had cut.

I still have to run the TV speakers out of my DVDR, but at least I have them again. Since there is no video out on the old set, I know of no other way to make the speakers play when the TV is turned on.

Should I leave the amp on all the time? It says it has protection for the speakers when it is turned on to protect from volume spikes. I'm pretty sure the speakers always had power to them from the TV, even when it was off. I'm not sure that the constant turning on and off of the speakers won't damage them.

I appreciate your sticking with me and answering all my questions.

Take Care,

Mark

That was a play off my middle name by a good friend/ex-co-worker. I don't think it's unique though as I've seen it used around by others.

Yeah that's about it for those TV speakers to work other than using a channel B on your surround receiver if it has one.

Me, I would turn it off to save 'tricity and make the amp last longer. No, most everything should be turning off when the TV is off except remote control circuitry and memory.
I power-strip related devices so I can turn them off together BUT I always turn off each device before flipping the power-strip switch (some of my devices have piss-poor standby current specs (ex: not energy star compliant)); this may or may not matter depending on the device, I just don't want to take the chance to deviate from the way things are designed to operate. If you're not worried about standby current and like me you turn the TV and amp off anyway then you don't need the power strip (I suspect that amp doesn't use any standby current when switched off).
Yeah audio amps tend to have power-on and power-off surges. If you don't hear real loud sound turning on and off then you should be OK, depends on how much power the speakers can handle.
post #23 of 24
Thread Starter 
Thanks, Floydage.

When I turn the amp on and off, I really hear nothing. I have my computer, monitor, router, and everything to do with the computer, on a power strip. I turn them on and off together like that. The only thing I do is shut down my PC before turning the power switch off.

I think I'll turn the amp off when not in use. I really don't watch that much TV anyway. I do appreciate the help and replies.smile.gif

My TV had built in Dolby Stereo. I assume it had a decoder. I think I'll still get the left-right separation through the DVDR though - not sure though. frown.gif

Mark
post #24 of 24
That's good you hear nothing.
I do the same with my PC but don't have a router, just a U-verse DSL modem that doesn't have a switch for some reason.

The DVDR should be fine and much newer technology (if you went thru your surround system and with all the required speakers you would have Dolby Surround). Check its menu for sound mode settings.

You're welcome.
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