Question about JVC AV-48WP74 48" Rear Projection HDTV-Ready Television

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Seemed to Fix Convergence problem; Now TV power doesnt work.

I only had a convergence problem , now I have more!. I removed the Convergence PWB, and Replaced BOTH IC804 and IC805 with two STK392-150's. Now, when I plugged the TV in, the "power" button would go on "blue light" but, no picture, no sound. The "blue" power button is not workable; the only way to turn the TV off is to unplug. Thanks for the help.

Posted by Vinnie Batra on

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Anonymous

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You need to check first for solder splashes or bridges created when the new Ic's were installed,the next thing to check is a disconected conector or might not in place fully and then check for loose conections in the main board,all that movement might have loosen something more than before,check the horizontal driver transformer,the horizontal output transistor.Be careful

Posted on Oct 03, 2006

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4 Answers

Toshiba 50h82 convergence problem?


Need to replace STK392-110 convergence locate these two chips on the left side near the inputs attached to huge heat sinks.


Thanks for using Fixya

Sep 28, 2008 | Toshiba 50H82 50" Rear Projection...

2 Answers

Need schematic for Convergence PWB of Hitachi


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

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

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

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

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos aroundimages.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Mar 09, 2009 | Hitachi Televison & Video

1 Answer

Zenith R60v26 has burnt resistor at RK5 on convergence board


Hello, I have the exact same issue with my R49W36, I replaced the convergence chips but there are also two 1 ohm resistors with the same color pattern as yours that are bad. I have looked all over and cannot find a 1 ohm resistor anywhere. Where did you find it?

Dec 31, 2008 | Zenith R60V26 60" Rear Projection...

2 Answers

What dose a convergence board look like?


This is what the convergence PWB looks like. Its located on the extreme right side of the chassis looking in from the rear of the set.9cc0c04.jpg

Nov 27, 2008 | Hitachi 43FDX20B 43" Rear Projection...

4 Answers

Black pop-up screen when pressing any menu features on remote


check for closed captioning. make sure it's set to off.


C-Dog

Feb 03, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Tv troubleshoot for me


chances are that IC804 has failed. You have two ICs that allow you to converge the three colors. IC804 is used for Red Horizontal and Vertical Convergence and also for Green Vertical Convergence. IC805 is used for Blue Horizontal and Vertical Convergence and also for Green Horizontal Convergence. These ICs run very hot and have a very high failure rate which sometimes will cause damage to resistors in their associated circuits. They are both STK-110 and it's best to replace them both at the same time. It's also a good idea to upgrade them to either STK-150 or STK-180. These will run a lot cooler than the STK-110.

Before replacement do inspect for any open or overheated resistors as I stated earlier. Being you only have problems with Red Convergence the plus and minus power supplies should be okay since they are common to both ICs.

Try www.tritronicsinc.com. They have the Hitachi CZ00433 (STK392-150) in stock for $20.11 ($32.43 retail). These are Hitachi OEMs. I've had very good results replacing STK392-110s with these chips. Do check for open or overheated resistors before replacing these chips

Dec 29, 2007 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Convergence


Ringmaster,
It sounds to me also as though the convergence amps are out. That unit has two STK392-110 IC's which are multi-pin IC's and not something the ordinary laymen should consider replacing for several reasons - more on that thought later...
The convergence circuit for that system is in the 800 location numbers on the board. IC804 and IC805 are your amps. They're mounted to an aluminum heat sink via screws and are backed with heat sink compound for added heat dissipation. You would also need to check all the feed resistors to those IC's for change in value. I have RARELY changed out the convergence amps and not found at least one of the feed resistors had changed in value. In that unit they're 2.2 ohm 2 watt.
Another insider tech advisement is to replace the present amps with STK392-150's instead of the 110's for greater reliabilty. They do cost a bit more, but are well worth the investment.
Lastly, can you so this yourself... If you're the kind of guy that could remove your appendix yourself with simple phone instructions from a doctor this will be a breeze. If not, get a professional. Not only can you ruin the amps putting them, heat damage, line-up or simple static blow out - after the job you'll need to do a complete convergence and may need to touch-up the parameters in the service menu (not a customer menu). And it relies on hex-decimal input. In short, you would be a penny wise but a pound foolish to do this yourself.
Bill

Nov 10, 2007 | JVC AV-56WP30 56" Rear Projection...

1 Answer

Ic replacement


Replace both IC's or you will re-visit later! STK-392-110 X 2....

Nov 10, 2007 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Jvc 56wp30


1st guess is bad convergence ic-either IC804 or IC805. Both are part #STK392-110. May be bad connections in convergence circuit, or open resistor(s) As for too much green, not sure, shouldn't be because of convergenece circuit, possibly green CRT screen voltage needs adjustment.

Dec 22, 2006 | JVC AV-56WP30 56" Rear Projection...

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