Question about Panasonic PT-47WX42 47" Rear Projection Television

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Convergence I am awaiting my convergence amps, which I ordered. It was also recommended to replace one or more of the 1.2 ohm resistors in the yoke return circuit out front of the amps.  Can you point me to a circuit diagram or will it be fairly obvious what to do once I disassemble the TV?

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The 1.2 ohm resistors should have the rating stamped on the resistors themselves. But if you would like the service manual I can post a link where you can buy one and get free unlimited tech support with the manual purchase

Posted on Apr 09, 2008

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Hitachi 61swx10b HDTV - Convergence problems. User 'gdroukas' mentioned in a post that it is probably the convergence amps and a few resistors that have changed value. Can anyone be a bit more specific? ...


Convergence ICs are Big Black ICs and will have the part number on them. STK392-110,
upgrade to 120s or 150s better ICs.
Resistors to replace are RK42 3.3ohms, RK46 1.8 ohms, RK50 2.7ohms,RK54 1.5, RK58 3.9 ohms. RK62 2.2ohms
Mats Electronics has STK ICs 1-800-628-1118 order convergence Kit that comes with resistors.
ACME has the Convergence resistors they must be 1 watt resistors 1-800-575-9833

Let me know if you need any more help Thank You.

Jan 13, 2011 | Televison & Video

1 Answer

I have a Hitachi 43fdx01b and I have just replaced the two convergence chips because of a "Red" convergence issue. I learned the hard way about the desoldering and resoldering, but got it done. Now i...


did you check the resistors by the convergence chips? check to see if they are open. the resistors are usually lined up on the other side of the heatsink as the convergence chips.

RK42 2.2 ohm 1 Watt
RK46 1.5 ohm 1 Watt
RK50 2.2 ohm 1 Watt
RK54 1.5 ohm 1 Watt
RK58 3.3 ohm 1 Watt
RK62 1.8 ohm 1 Watt

the convergence chips to be used are
IK04 STK394-160E Part #: CZ01341
IK05 STK394-160E Part #: CZ01341

Oct 07, 2010 | Televison & Video

1 Answer

Mitsubushi VS-5043 Rear Projection,,, Replaced 3 Converrence IC's. Recovered green color. Red color is bowed. Cannot move red crosshais in convergence set up. Is their a way to reset? Could something else...


There are a few low value 1-watt flameproof resistors in the convergence yoke circuits. They typically range from 1 to 3 ohms. An open resistor will cause the respective color to be non-responsive. Also chack that you have the convergence yokes re-connected to the correct connectors on the board.

Nov 10, 2009 | Mitsubishi VS-5043 50" Rear Projection...

1 Answer

Convergence


This set is made by Hitachi and uses two STK392-110, Sanyo amps to control convergence. You have likely one amps that is shorted causing the problem, but it's HIGHLY recommended that you replace both amps. Also it uses 1.8 ohm 1w resistors, out in front of the amps, for the yoke return circuit and one or more of them may need to be replaced if they are beyond tolerance.
For this job you need a soldering station, VU meter with a ohms test, desoldering braid and a skill level of 8 on a scale of 1 to 10. Anything 5 or above would be a category of someone schooled in electronics.
If you need to find a tech in your area I suggest http://www.tvrepairpros.com/

Hope this helps!
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993

May 14, 2009 | Philips 60PP9401 60" Rear Projection...

1 Answer

Panasonic 52 inch rear projection


Sounds like convergence and there is nothing to adjust. You'll probably need to replace the convergence amps and one or more of the 2.2 ohm resistors in the yoke return out in front of the amps. That unit requires two STK392-110 Sanyo amps, personally I'd buy them from ACME sales in Florida. Lots of fakes out there that could cause you problems. You could also order about 6 of the 2.2 ohm resistors and just replace all of them as well. That should repair the unit.
The amps are mounted to an aluminum heat sink, multi-pin and hard to miss... Just take extra precaution de-soldering and soldering the new amps in...
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993
premtech@willapabay.org

Nov 15, 2008 | Panasonic PT-53WX42 53" Rear Projection...

1 Answer

TV turns on only after disconnecting convergence cable to red yoke


Projection TV2_bing.gif sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV 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, Samsung2_bing.gif, JVC, Philip Magnavox, Panasonic, Akai, Pioneer, Hitachi, Zenith2_bing.gif, and others. You can get a convergenece repair kit from the link below.

Common Symptoms include....
  • Screen looks 3D2_bing.gif
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on - TV may also make a chirping noise.
Here are some photos of convergence problems.

49abec3.jpg
f0add3d.jpg


Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash2_bing.gif focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a solution

93a1209.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you know what you are doing. If you have never done this before we would advise calling a shop or if you want to do it yourself get a complete kit with instructions and support from www.TvRepairKits.com

Sep 23, 2008 | Philips 50PP9202 50" Rear Projection...

1 Answer

JVC AV-56WP74 Convergence part #'s


(2) STK392-110 Convergence Amp ICs
(3) 220 ohm 2watt metal film resistors
(3) 150 ohm 2watt metal film resistors
(2) 1.5 ohm 1watt metal resistors
(2) 2.2 ohm 1watt metal film resistors
(1) 1.8 ohm 1watt metal film resistor
(1) 3.3ohm 1watt metal film resistor
You can get the entire convergence repair kit which contains all the parts listed at the following link its called the AV48WP30 Convergence repair kit , but it applies to your model as well, and they include free installation instructions.
http://servicemanuals.vstore.ca/

Aug 18, 2008 | JVC AV-56WP74 56" Rear Projection...

2 Answers

Urgent help


ok i would suspect the yokes are shorted to ground somewhere. you can measure that. the dcu or the digital convergence unit... which is the processor that handles the convegence of the set. i would have to research and pull up schematics to know which output on the convergence chips that those resistors handle blue ver...blue horizontal..etc.. that might help to see which output is shorted.

Feb 09, 2008 | Hitachi 53UWX10B 53" Rear Projection...

1 Answer

Changed the ICs but bad resistor


jonze,
I don't have a schematic here so I'm shooting entirely from memory... the 850 series position tells me you're in the convergence circuit and I would guess you're replacing some of the yoke return resistors.. Are there any color bandings on that resistor? How about compare it to R846 which I know is a yoke return resistor (it's a 1.5 ohm / 2w) and does it look about the same?
Now I'm going to be really pushy - - - the heading here says you changed the ICs and I would assume you're referring to the convergence Ics? Both are a STK392-110 factory, what did you change them to and where did you get them?? Reason I ask is that there are a lot of chineese knock-offs out there and they won't last sometimes past pressing the power button. And usually with these units I upgrade to a higher amp Ic for greater reliability like a STK392-150 or 180... In addition take a dmm or annalog ohm meter and test all the low ohm resistors in that youke return. A resistor doesn't have to look burned to have changed in value...
Where do you get them... Try Acme Enterprises in Florida.. They have quality Sanyo original Ics and prices are cheaper than anywhere else you'll find in the US... http://www.acme-sales.net/index.shtml
Have a great day and good luck on your repair!
Bill

Dec 09, 2007 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Toshiba projection television


If setting the convergence in the menu doesn't help it's most likely the convergence amps. Your set takes two STK394-250A Sanyo built amps at Q751 & Q752 Toshiba p/n# 23135048. Also check, or have checked, the low ohm resistors in that circuit referred to as the yoke return resistors.
Bill

Dec 01, 2007 | Toshiba 51H84 51" Rear Projection...

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