Red Convergence Popping In and Out, Mostly At Bottom
TV's always had a problem with a small bounce near the unit throws convergence out.
Now the red convergence top to bottom goes out mostly at bottom third of screen.
I'm assuming I'd start with replacing the convergence amps but am wondering if I'm better off hunting solder joints first.
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Re: Red Convergence Popping In and Out, Mostly At Bottom
If you're NOT still under warranty you should at least open the TV you can check the board where the components are mounted and resoled any that look bad.
In your case it could caused by a leaky diodes or a bad solder joint. All can be replaced at a local electronic or hardware store and they're easy to replace.
Heres a little case study in changing convergance Ic's, First thing is they are the hardest working Ic's in this set, this is why they are mounted to a huge heat sink to disapate the heat, and they work as a pair, You would not just change one tire on the back of your car, both tires have traveled the same distance and to think the other is going to be just fine is insane, Always change convergance Ic's as a pair and in older sets change all three.
And the other little problem
Several manufacture make this Ic, the cheapest one may not be the way to go here
I think five companys make the STK392-040 over twelve make the STK392-110, In the case of this hard working Ic it is always best to go with the original manufacture Ic
Just as a example here at the shop my employer told our parts guy to find some cheaper Ic's ( The STK392-110 ) since we burn through about 50 a month he found them Not the Panasonics that I run for about $19.50 each but some japen semis for a amazing $4.95 each, he bought 100 of them.
Now about 1/3 failed right off the get go, the other half failed within 60 days causing a call back and since we get to pick the set up for free it gets better, and all the rest never made it a year. So out of the $1455.00 saved by getting these cheepies cost us over $7850.00 in free labor.
Guess which ones we buy now...
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This tv 100% have a convergence problems,it dead.The tv convergence board,must require changing 2 STK convergence ICS and some or all it resistors.U have tools like a soldering iron,desoldering pump and solders?Know basic electronic,can u do soldering?Tries website like Tvrepairworld.com,Tvrepairkits.com to buy a convergence kit to do the repair ur self.Or the shop,will cost u $300-350 for parts and labors.
Ur tv have convergence problems.The 2 convergence ICS it not total dead yet,but it going to.Must know how to solders.Must replaced 2 convergence ICS,and some of it resistors.Tries Tv repair World.com to buy a Convergence kit to repair it ur self.The shop will cost u $300 for parts and labors.
Remove Front bottom Panel thier you will see front of convergence board there is a small blue contact switich with TV on press and hold it for 5 sec then you should see convergence Pattern so you can aline convergence correctly I have the whole Manual to tv just have to find it. anyway for now try this.
Have convergence IC's replaced. I believe this unit uses STK-392-570 convergence IC's Only one has gone bad but replace them both, because if one has failed then the other is not far behind, for Blue and Green. One handles Red, One handles BLUE and Grn. There are only two of them in the set, They are the two largest IC's in the entire set.
Replaced the ICs. Was disappointed at first 'cause it was still all bowed out, but then realized that the Convergence 2 "target" can be changed with the number keys. Working thru 1-9 and going back to readjust as necessary adjusted each one into perfect alignment.
Problem solved. TV works great.
I should add that while I am reasonable technically adept, I am a software geek and never soldered before... hardest part was getting up the courage to dive in and do it myself. Glad I did.
You will need two STK392-120 Convergence ICs and about 4 6.8 ohm 1watt resistors. You can get replacement ICs and resistors at the following link and they provide free instalation instructions with pictures so you can do the job yourself. Here is the link. http://servicemanuals.vstore.ca/
Projection TV sets are known to have two common problems. The first problem that is common to these sets is convergence failure. When this happens the TV will usually look 3D, Wavy/Distorted, etc. It may also shutdown and blink an error code.
The second common problem with Projection TV sets is dull video, halos around objects, white looking video, or red overpowers the screen. This is commonly caused by the fluid in the lens being clouded overs.
You can find more details and solutions here on Fixya at the following link below. Or click HERE
it looks like theres a wave in the top of my screen on my jvc av-48wp30 not sure but i think it has something to do with the bulbs because the projection mirror wasfine and all wires seemed to be hooked up properly.. can you help? tell me where i can find the bulbs to replace them?