Question about JVC AV-48WP30 48" Rear Projection Television
I have red and green vertical lines across the entire screen top to bottom when viewing any video source but NONE inside of the video MENU when I select that... I suppose it's something related to the convergence board but want anyones experience/knowledge on this...
I had this problem, I just fixed it myself. I'm am not a tech or a pro by any means, but I am short on funds and repairs were not in the budget. I figured I had nothing to lose so I wanted to share what I did and maybe help someone out. This is to be done at your own risk, you could shock yourself or break something else.
First off, I had the conversion circuit changed a few years back. These TVs are famous for them going out, so I knew it wasn't that.
I removed the back of the TV and the plastic part that houses' the connections (RCA jacks, S-video,etc) Behind that there is a circuit board standing vertitcally incased in a metal case. I simply wiggled it back and forth and the lines went away. That told me that something was going on there.
I removed the circuit board that had the RCA jacks to make some room( I would'nt force anything in there, take your time and be sure to unclip the circuit board) I then unscrewed the "metal case" and took it apart. I dusted everything and put it back together exactlly how I took it apart. I then cleaned the lenes.
It works great now and it only cost me a hour of my time. The picture is as good as new. I hope this helps somebody.
Posted on Jun 14, 2010
I have fixed many of these TVs and don't reccomend that inexperienced or untrained consumers attempt any repairs. You may hurt yourself, others or the TV.
It sounds like it may still be convergence. Look in Convergence Gallery.
If not convergence, tap the crt boards gently from different directions. (through the front inspection panel) Tap the crt necks gently as well. Tap with the plastic handle of a long screw driver, don't use the metal end to tap or probe with. Watch the picture for microphonic effect, pic "jumps or changes" when you mechanically tap.
The TV is on and operating so the possibility of lighting yourself up exists. Tapping or probing is done with the plastic end of the screwdriver, one handed. You can't be holding the frame of the tv with your other hand, or sitting on a tangle of cables that connect the 3 vcrs, 2 games, laptop and FTA sat receivers.
Do not ever touch any innards with your bare hand when the TV is plugged in, unless you know specifically that the item/control or whatever is safe to touch. Turned off is not good enough as all modern TVs are still partially operating in the "off" mode.
Do not play with the other items on the CRT neck as many hours of time may be wasted re-aligning.
If the picture jumps or reacts to the tapping turn the power off. Unplug the TV.
There are a number of conditions that may exist.
1. CRT is defective with internal Heater cathode leakage or other fault. Typical shop estimate CRT +$300, Labor $2-400 Handling extra. JVC CRTs are rarely defective.1time/100 complaints
2. Circuit on CRT board is defective. Usually the only defect is poor solder connections. Bad solder connections 1 time/10 complaints
Typical shop estimate CRT Board +$150, Labor $2-400 Handling extra
3. Pins on CRT are dirty, corroded or loose in the CRT board socket. A poor electrical connection occurs between one or more crt pins and the socket on the CRT board. Tapping and moving the board makes and breaks the electrical contact and the pix jumps (for that color)
This is the most likely problem if it is not convergence. 9/10
The fix is simple.
Use a very small jewellers screwdriver with a flat blade. Scratch the corrosive coating off the crt pins one at a time. Start at one pin and work your way around the base of the crt. Just a minor, gentle scratching that does not bend the pins. The corrosion may coat the pins and appears as black or grey varnish instead of metallic.
After scratching the pins, each pin is bent the smallest noticeable amount outwards. Then the crt board and socket is re-installed. It will now fit tight and require some wobbling back and forth to re-install. If any serious resistance is encountered stop immediately and examine the bent pins, one or more is bent too far.
Forcing the socket on the crt when a pin is mis-aligned can break the pin or crush it against the centre. If you damage a pin, crt is junk.
Only attempt repair on the the crt socket giving problems. Preventative maintenance is not a good idea in this situation.
If cleaning and bending the pins doesn't fix, then check CRT PC board for bad solder connections on the crt socket/board connections. (circular pattern)
If you live around Calgary, call me , if not, find someone competent.
Posted on Aug 15, 2008
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Posted on Jan 02, 2017
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