Question about JVC AV-65WP74 Rear Projection Television

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Thanks for the help

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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Terryfic
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Rating: 87%, 1104 votes
B+ voltages to run the convergence circuit missing == check power supply for open fuse devices..........................T.
I am a novice with a repair manual and a passion... could you step me through it? Sorry for the inconvenience.

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

Posted on May 07, 2008

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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

I have a 53 in. sony projection tv,. bowed picture tubes?!?


Replace Both STK convergence ICs will have part number on them STK392-560 use same part number on your STKs. Also around ICs ck pico fuses 5/6amps they are green or yellow.

Jan 07, 2009 | RCA P56930BL 56" Rear Projection...

1 Answer

Ws 55511 convergence lines bowed down at bottom of screen


Hi,
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

One color Bow-tie Effect.


SAMSUNG Convergence Problem


It looks like blue convergence. Look at menu, select convergence and see if blue top is bent down on convergence adjust screen. Probably won’t adjust.

Some Samsungs have convergence IC’s on a separate convergence board in the back of the TV. Others have the IC’s mounted on the main deflection board. Either way the board has to be removed to get at the dud IC’s and associated burnt resistors.

You remove the appropriate board, determine if any resistors are burnt or damaged, replace any burnt or out of tolerance resistors, replace 1 or 2 IC's and re-install the board.

Now you have to adjust it to look like new.

If the unit has not been misadjusted and everything is OK now, running the auto focus may put the picture back to it’s previous stunning quality as it was before IC failed.

If after Perfect Focus it is still misadjusted noticeably, try the customer convergence adjustments. Operators’ manuals are available on web through searching.

If convergence can not be adjusted properly, you messed up chip install or resistors may be wrong value or open; or it needs major adjustment.

If you live around Calgary, Alberta try me instead:

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


Or try to the find the repairperson part of this website (on the Homepage) and search postal code. Maybe you will be lucky and someone from your area is listed for Projection TV repair.

Most rookies doing this job will cause damage and not be successful. They will pay double for someone to fix their mess or end up scrapping the TV. It is not a simple task. It is more difficult than batteries on a remote.

Good Luck

easyab

Jun 05, 2008 | Samsung HCN4226W 42" 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

Convergence


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

Apr 06, 2008 | JVC AV-65WP74 Rear Projection Television

1 Answer

Convergance issue still exists


did you ever solve this?
v_incent_mills@hotmail.com
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...

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