Question about JVC AV-48WP30 48" Rear Projection Television

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Convergence.. I recently changed the ic's and the 1.8 ohm on my tv but I still don't have a clear pic. I have a swirl at the top and bottom of my tv. I did a pretty good job with the IC's but I'm not sure I changed the right ohm. Should I change all the resistors? How do I test which one is no good..? Please help... Thanks

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  • JVC Master
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On JVcs it best to change all the low ohm convergence resistors, but you can test them by unsoldering one side of the resistor and lifting that side out of circuit it has to be within 5% of the rated resistance.

Posted on Jul 21, 2008

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My Hitachi has a blue and yellow swirl band at the top and bottom of screen


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

Mar 02, 2011 | Hitachi Televison & Video

1 Answer

Convergence Problem


Replace the Convergence Ics and the six 2.2 ohm resistors. Heres a link to the proper repair kit for your model which contains both Ics and the resistors plus step by step instructions with pics on how to do the repair.
http://servicemanuals.vstore.ca/product_info.php/pName/panasonic-projection-tv-convergence-repair-kit-1/cName/convergence-repair-kits

May 06, 2009 | Panasonic PT-53WX52 53" Rear Projection...

1 Answer

Samsung:pcl4515r


You may still one more resistor opened , samsung most of the time its 2 low ohms but can be 3 it will be same value as other 2. I think they are 2.7ohms or 3.9 How to Enter Service Menu for convergence Turn TV off Press Mute 1-8-2-power now you should be in convergence use vol- and vol+ to select an item Use mute and menu to adjust when done Press ADD to save adjustments made.

Dec 12, 2008 | Panasonic PT-51HX42 51" Rear Projection...

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Red and green lines on picture only in the corners of the pic


YIKES, I dont know about Coolant changes but I'll post my general post about the 51MP392H/17

it has links to the SERVICE MANUALS and info to other sites that might help...

GOOD luck


General post....
51MP392H/17

Actually I have this TV and you need 2 Convergence IC's STK392-120's (120's and 150's will work) of course order 2 of the same type I'm using replacement 150's they allow for a little higher heat and were cheaper ALSO you need to replace the 12 resistors with 6.8 ohm metal film resistors, make sure they are metal film! don’t skimp out here I did and then they blew and fried my IC's and I had to replace everything again!

Great reference link that I posted pictures on, check out page 3
http://www.techlore.com/forum/thread/16736/Magnavox-51MP392H-17-51-quot--TV-has-double-vision/

Where I got all my parts that worked:
Suburban Electronics http://www.suburban-elect.com/

Manual Library you should find all you need here:
http://www.techlore.com/group/2/list_downloads



What you need:
(2) STK392-120 OR STK392-150 IC chips
(12) 6.8 Ohm Metal Film resistors
set of star screw drivers
15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item.
good leaded solder, and flux


BTW if you don’t plan on trying this and are going to throw out the TV, I still need a IC convergence board for a 51MP392H/17 TV I'm fixing, I'm willing to pay S/H and buy your IC board that’s not been tampered with. Edwinkraus@hotmail.com

Nov 13, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Hitachi projection tv


I would change both ICs STK392-110 and also the 3.3ohm 1 watt resistors and the 1.8 ohm 1 watt you would need 2 of each resistor. Then your convergence would be new again. You can get replacement ICs and resistors at the following link with free shipping and free instalation instructions with pictures.
http://servicemanuals.vstore.ca/

Jul 01, 2008 | Televison & Video

1 Answer

Convergence


Luis. You need to replace both the convergence ICs which are STK392-110 and possibly the 1.8 ohm 1 watt resistor you can get replacement ICs and resistors at the following link and they provide free installation instructions with pics so you can do the job yourself which is very easy on your model set.
http://servicemanuals.vstore.ca/

Jun 15, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Double Vision ...w/waves on top/bottom too much green.


1024x768 Normal 0 Convergence


When A REAR PROJECTION TV has coloured outlines or a 3D image the Convergence Circuits most likely need attention.

Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and no more color outlines.

This is the most common fault in all makes of rear projection TVs.

Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design that causes other power supply or vertical deflection problems. The poorly designed products require a "bench" repair that can typically cost from $350 t0 $700.

Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail. The ones that usually allow reliable on-site repair are JVC, Samsung and Hitachi.

It is normal to have some resistors in the circuit burn up or increase in value from the heat (from 2.2 ohms to 5 or 10 ohms). These resistors must be replaced with the right value or the chip may fail again.

This is not a simple repair like changing batteries or a fuse. Reading through the other posts shows many that try and end up with bigger problems.

Your JVC uses STK 392-110 IC's. Misinformed people replace the IC's with other "new and improved" IC's, like STK 392-150. These are devices with different characteristics and require different value resistors in the circuit. Replacing with the STK 392-150 will cause overheating of the resistors and a damaged IC.

If you are in Calgary, I can help. If not, get someone that has experience working on your JVC. My website is below with some costs and explanation.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab

Jun 05, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Hitachi 61udx10b


Check the resistors near the Ics especially the 3.9 ohm 1 watt resistors often one or two will be open then when you install the higher wattage Ics which run cooler you can actually wipe out all the convergence resistors which are 3.9 2.7 and 4.7 ohm 1 watt resistors

May 20, 2008 | Televison & Video

1 Answer

Pic distorted slightly on left side. news (crawl) on bottom of screen angles down on left side, top of pic seems to angle up also. very minor problem but annoying anyway! pic clarity & color excellent.


Convergence amp ic bad
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
Sony Convergence
http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/
http://www.techlore.com/article/19631/Sony-Convergence-Procedure/

Jan 29, 2008 | Toshiba 55H70 55" Rear Projection...

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