Question about JVC AV-65WP74 Rear Projection Television

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Convergence same problem. top bows down and bottom bows up. no adjustability on the manual mode. already changed the ic's. no effect.

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B+ voltages to run the convergence circuit missing == check power supply for open fuse devices..........................T.

Posted on Apr 06, 2008

  • Vista Electronics Apr 08, 2008

    Soldered in small pico fuses are what you look for.......

    Do you have the service manual ?............



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My 57hx81 has a slight concave bow in the middle top to bottom

Sounds like a problem in the vertical sweep circuit. Check voltages to your convergence ICs. If they are  not to spec then look for bad fuses and capacitors on the power board. These will throw off the DC voltage to the convergence chips causing the bow effect. I've had a single bad pico fuse ($1) cause this symptom. 

Dec 06, 2009 | Toshiba 57HX81 57" Rear Projection...

1 Answer

Ws 55511 convergence lines bowed down at bottom of screen

Check resistors might have cold solder joints are changed resistance values around replaced STK393-110
Pay attention to faded colored or fried resistors.
You can download service manual for WS-55511 from HERE to get schematics and technical info. (download all 3 parts of file and use WinRAR to extract file)
Good luck.

Dec 13, 2008 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

43F300 convergence

convergence kit # x480306 , dont go into the service mode unless you know what your doing in there and what your adjusting./st.

Aug 22, 2008 | Hitachi 43F300 43" Rear Projection...

1 Answer

Thank you

Check pico fuses in power supply with ohmmeter......
Check current-limiting resistors near convergence IC's.......
Measure B+ supply voltages ( use manual)................

Apr 08, 2008 | JVC AV-65WP74 Rear Projection Television

1 Answer

Thanks for the help

check the resistors right next to the ICs usually the 1.5ohm resistors will open when the ICs go out

Apr 08, 2008 | JVC AV-65WP74 Rear Projection Television

1 Answer

Convergance issue still exists

did you ever solve this?
I have the same problem with mine.

Mar 21, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

Red convergence is bad.

Hi, you need to change the convergence ICs , STKs: and some resistors,low values; , after changing them, you will have to go into the service mode, to do some adjustments.that's it.

Nov 27, 2007 | Samsung HCN4226W 42" Rear Projection...

2 Answers

Horizontal bow and shadow

Replace convergence IC's--then re-check convergence alignment in servicer mode,if necessary.

Sep 27, 2007 | Philips 9P5544C 55" Rear Projection...

2 Answers

Convergence Problems

If you did not use heat sink compound then you probably have not hurt the new IC's yet but you should remove them and add the heat sink compound NOW. If the convergence IC's are bad then you will have access to the convergence menu but the adjustments will have no effect. The fact that you switched the IC's and got the same results shows that the IC's are good. If your red convergence is still way out when the new IC's are installed then the old IC probably burned out the low value resistor associated with the Red Vertical (RV) channel.

Jul 02, 2007 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Convergence no adjustment

There are black in color circuit protectors in the set that have blown because of the bad convergence IC's. You will need to measure the voltages on the ICs and make sure you have the correct plus and minus voltages. There should be about + and - 24 volts on each IC. I'm afraid the only way you will know what voltage are what and where they should be would be to get a service manual. i am sorry i do not have this model to share with you. Good Luck.

Apr 27, 2007 | Mitsubishi WD-52525 52" Rear Projection...

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