JVC AV-27S33 27" CRT TV - Component Horizontal Sync Issue?

[mwatson]

I just picked up a 27" CRT TV from craigslist, all inputs other than component seem to work fine. I'd chosen this model for the option of having component, so I'd like to try to fix it if possible.

The problem is with the horizontal alignment (the Y/green input?), I switched colors to be sure it wasn't the cable and the problem still persisted. After reading another thread about this TV I switched the component input on, which gave me color but didn't correct the sync issue. Should there be a setting to fix this in the menus? or is it likely a poor connection inside the TV?

I was planning on removing the front bezel to paint flat black anyway, so I'll be able to fix anything that may have come loose then. I just wanted to see if someone more knowledgeable about TV's could chime in with some advice.

Thanks in advance!

-Mark

[Dennis]

"Component" doesn't have a "Y/Green".  Component has "video" and "right and left audio".  You must be talking about RGB video which has separate Red, Blue and Green with sync.  I really don't believe that you are going to find anything "loose".  You either have a "signal" problem or an internal failure within the TV, of which I have never come across.  I suppose you could have a "setup" function that has the input set to the wrong format.  I suggest contacting the supplier or manufacturer of the tv, telling them of the equipment you are attempting to connect and see what they have to say. 

[tetsu96]

"Component" doesn't have a "Y/Green".  Component has "video" and "right and left audio".

Composite = Video + R & L Audio (They're usually Yellow for Video and Red with White or Black for the Audio)
Component = Y (which is green as far as color coding), Pb (Blue), Pr (Red).  Not true RGB since the sync is mixed in, but it's close.

As far as the sync issue, it may be best to test with other video inputs and see if the video still has the sync issue.  If its just on the component plugs, then you've isolated where it hapens (and if it happens on other inputs, then it may be the veritical IC or similar).

[Silver]

You have not actually described the problem. What exactly is the issue with the h-sync? You said you changed a menu setting and got "colour". What exactly are you seeing? What is your source? Does it work with different TV/different source?

[mwatson]

You have not actually described the problem. What exactly is the issue with the h-sync? You said you changed a menu setting and got "colour". What exactly are you seeing? What is your source? Does it work with different TV/different source?

Ah sorry I got distracted explaining what I'd tried doing to fix the problem!

As far as the actual issue - when I connect the Y (green) cable of the component input, the image on screen is two half images (split more or less exactly down the center of the tv, but not  lined up properly). If I wiggle the cable slightly it makes the picture stretch diagonally from top left to bottom right and it flickers fairly consistently. All the other inputs on the TV seem to display fine (including s-video).

[shorthair]

Sounds like a jack issue.  I have 21" PC monitor that the vga port is squirly: makes it look pink over everything, or goes out of sync.

[mwatson]

Would that be due to a poor connection on the inside of the case? Could I resolder the connection on the inside or is this a whole module I could purchase? I'm not too familiar with TV internals, and haven't pulled the case off yet so I'll have a better idea this weekend when I can get to it.

[richms]

Try plugging a normal composite video signal into the green plug and see if the tv will lock onto that, if it doesnt then its the tv, if it does, then its the source.

[shorthair]

Well, I thought he just said they worked.  Alright, let's try again: you plug in S-video from your computer and you get a decent picture, right?  You plug in a composite source (VCR, say) and you get a decent picture, right?  You plug in your coaxial cable and you get a decent picture, right?

If all of these are no, then go with what rich said.  If one or more of these is no, but at least one of 'em works, it might be that some of them share something in how they're wired.  (Like my technical know-how there?)

If you're getting some kind of effect with the component when you handle the cable, especially close to the port, I'd say it's a connection.  Can't hurt to pull it open and look - no warranty on the thing.  (Point of note: always check stuff out for what you're wanting, on location.)

[Magnesium]

I have the same TV, and I was trying to get it to work with a component feed from an xbox. I had the same issues you have described. I couldn't figure out what the reason for it was, since the component inputs worked fine with a DVD player. I finally tried a different xbox (a Halo special edition), and it worked just fine. My guess is that it has something to do with a faulty video output on the original xbox I tried. I used the Monster component video adapter in both cases

A little disclaimer. I did drop the TV a few years back, and did some damage to the electronics and front panel controls. Other than that, the TV seems to work fine.

[mwatson]

Well, I thought he just said they worked.  Alright, let's try again: you plug in S-video from your computer and you get a decent picture, right?  You plug in a composite source (VCR, say) and you get a decent picture, right?  You plug in your coaxial cable and you get a decent picture, right?

If all of these are no, then go with what rich said.  If one or more of these is no, but at least one of 'em works, it might be that some of them share something in how they're wired.  (Like my technical know-how there?)

All of them seem to work fine except for the one input (green) on the component, I imagine it must be something regarding one of those two pins, but I can't seem to see anything wrong with it. I do get some change in the screen (it brightens and the horizontal sync is making the image go diagonal/split down the middle depending on its current mood ).

If you're getting some kind of effect with the component when you handle the cable, especially close to the port, I'd say it's a connection.  Can't hurt to pull it open and look - no warranty on the thing.  (Point of note: always check stuff out for what you're wanting, on location.)

Yep you're right, I should've definitely checked while I was there (though I drove 45 minutes to pick it up  ).

Sorry it has taken me so long to respond - I'd given up for the moment and just noticed it'd be bumped (thx Magnesium). I took the whole thing apart and check it for damage but visibly there was nothing. I didn't have a multimeter so I wasn't able to check the actual traces, but I may be able to get my hands on one soon. Any more opinions or tips on things to check are more than welcome.