Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

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Green color convergence

The green color line bowed down the front of the screen and the picture was very blurry. Replaced the board now i get no picture at all...what went wrong?

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  • matjan Feb 14, 2009

    Same thing with our tv. nothing seems to help. Any suggestions?

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  • 2,920 Answers

Make sure you hooked everything up properly and that all connections are tight

Posted on Aug 29, 2008

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My tv on the right of the screen is blurry,with green around the images.


Ur tv have a problems known as a convergence picture problems,it is dead.The tv have R,G,B colors lines mis alignments,tv have colors shadows pictures or 3D pictures look alike?Yes,than the tv have a dead tv convergence board.The tv convergence board must require changes 2 STK convergence ICS and some or all of it resistors too.After the tv convergence board is fixed,the tv convergence picture problems will be solved.The tv shop,will cost u like $300-350 for parts and labors.

Apr 26, 2011 | Hitachi 53UDX10B 53" Rear Projection...

2 Answers

My samsung pcl6215r is having problems with the green screen. The red and blue colors are fine but the green wont line up with them and its making it out of focus badly. It doesn't appear to be dim or...


brent hardin,

Your description of the problem sounds like a convergence issue. You more than likely have lost the convergence ICs. They will need to be replaced and the convergence will have to be set. The green beam should not move. It is the standard which the red and green are moved to overlap. Since you have bow at the top and bottom I would replace the convergence ICs. I have a tip at http://www.fixya.com/support/r4220499-change_projection_tv_convergence_ics which explains the problem, how to replace the parts and where to get the replacement parts.

Thanks for using FixYa and for the great rating. Great ratings will keep the experts helping to solve problems. Thank you.

hardrocko

Nov 17, 2010 | Samsung PCL6215R 62" Rear Projection...

1 Answer

Magic focus blue is fine, green and red are really blurry, tv picture is almost black and white. all bulbs are on.


Tv have a problems known as a convergence problems,it dead.Any colors lines R,G,B mis alignment,have colors shadows pictures or 3D pictures.The tv convergence board,the 2 STK convergence ICS and some or all it resistors are dead.These parts,must be replaced on the convergence board,to solved the convergence problems.The shop,will cost u $300-350 for parts and labors.

Sep 13, 2010 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Hitachi projection tv 53uwx10ba - the Convergence ICs were replaced. When the PDKP bridge between convergence board and 2nd board is plugged in, it makes a noise. Kept that unplugged, the picture is...


Did set have this problem before you replaced the STKS?

I know these sets very well. If problem is different in any way from before you replaced chips.......double check all soldering or one of the new chips may be defective.

The more you tell me the better I can help.

regards, SD TECH

Aug 18, 2010 | Hitachi 53UDX10B 53" Rear Projection...

2 Answers

Rca r52wh74 bowed picture and 3 d color


Your convergence amplifier has failed.
There are a few things that usually cause that in that particular chassis design, the most likely one being that you have lost part of the power supply to the convergence amplifier power supply board.
You may be able to repair it yourself if you're good at soldering, and dis-assembly / re-assembly.
Look for a 400ma fuse that's opened near the FBT, and re-solder all the connections in that area. Also check to see if any diodes have shorted around it too.
Good luck.

Dec 01, 2009 | RCA Projection Televisions

2 Answers

P58a red convergance is bowed down on top and bottom


Projection sets have two very common problems outlined below.

The first common problem is convergence

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. The TV can also shut down when the convergence starts to fail.

Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith, RCA and others.


You can more info and a DIY convergenece repair kit with instructions from TV Repair Kits using the link at the end of this article.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped or bowed
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Oct 12, 2009 | Akai PT5598HD 55" Rear Projection...

1 Answer

Convergence problem


you may have shorted some thing out when you installed the new board

Aug 26, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Samsung Rear Projection Problem (not convergence)


The tv has 2 focus adjustments for each tube, mechanical and electrical.

1. Mechanical focus is set by looking at screen from back (through inspection plate on back of most samsungs) and rotating the lens assembly on CRT. loosen wing nut and turn lens assembly to go through focus and back to best position.

Put convergence pattern on screen and manually misadjust bottom red and green lines convergence so they can be seen through inspection hole.

With back cover of TV off you can usually reach your hand up beside the lens assembly to loosen the wing nut then rotate to adjust. Green is in the middle. The focus will be obvious when you rotate and look

When you are finished make sure the foam dust protector is not over any of the lens assemblies and the wing nut is tight.

2. Electrical focus - located at front of unit. the front grille/speaker cover is removed and maybe a cover over the front crt inspection hole.

In the inspection hole there is a black plastic "Focus/screen adjust Assembly" with 2 rows of 3 controls.

One row is focus and the other is screen. The middle controls are for green with R/B on either side. Usually the controls are labelled as "focus" and "screen". You want to adjust the focus controls, one for each color. Look for the focus or screen label imprinted in the plastic. Don't play with the screen settings.

With the same misadjusted convergence pattern you can see a red, blue and green line. Adjust green focus and watch green line for best focus. Do same for other 2.

Screen adjustments are very exact and delicate. The easiest way to deal with them is to turn color off in Customer adjust menu. Put any color tone adjustments in the middle (low, med, high, put at med).

You should have a b/w picture if there are no crt or other color related faults. If it is close to B/W leave screens alone.

If the pix is too green, then the green screen setting must be reduced a small amount. Do not play with these adjustments as most TV repairrers have a difficult time adjusting them.

If focus adjustments don't help then focus control or CRT may be defective. Needs expert to determine.

easyab

http://calgaryconvergencerepair.weebly.com/convergence-ics.html


Jun 24, 2008 | Samsung HCM4216W 42" Rear Projection...

1 Answer

Pt5598 rplaced convergence board no luck.


If the picture is still bowed, the power supply fuses are open.
Check the power supply on the red connector for + and - 20 volts.

The fuses are on the main board,are on the deflection module in the middle, tward the front of the TV. They should look like green (or brown) resistors. An ohmmeter check will show which ones are bad.
They should be 3.5 amps. Replace with 4 ohm GMA fuses with pigtails if you can't find picofuses. I also had a set that would fry the 1 ohm resistor on the 20 v supply. This was near the fuses.
I replaced the whole module to fix that.

I hope this helps. Lee, www.crazycomputers.com



May 31, 2008 | Akai PT5598HD 55" Rear Projection...

1 Answer

Replaced Convergence Board picture still bowed


Today may be your lucky day. Approach this procedure with extreme caution and take your time. Sometimes when you replace that board you have to do a full digital convergence alignment. With tv off, push mute,1,8,3,power. Tv will come on in service mode. Certain buttons can now screw up the set in a major way, do not guess. press 7 to adj. red, 8 for green, or 9 for blue. Then look for the highlighted "x" intersection. Use directional buttons to adj. while careful to watch screen. Vol+ and - or ch+ and - make moves, mute moves cursor. If alignments move up, down, left, and right continue until all intersections are aligned. Turn power off to start over. When done press add/del on remote to save settings. That should fixya.

May 30, 2008 | Akai PT5598HD 55" Rear Projection...

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