Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

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No power after replacing convergence chips

The tv makes a heartbeat sound and won't come on. The light flashes on and off after we replaced the convergence chips. What went wrong?

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Re: No power after replacing convergence chips

Check the pins on the convergence ICs to make sure the solder isn't bridged between any two pins. You will need a magnifying glass to make certain.

Posted on Jan 24, 2008

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My tv won't turn on when the on button is pushed, but the power light blinks 5 times

5 times LED blinks in Panasonic PT-47WX42 shows problem with convergence out chips failure as this tv has two big black ICs STK392-110 as convergence output, replace them to fix tv problem.

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Toshiba tp50g90 projection tv, red flashing light won't turn on

FYI: WHOEVER told you 110 chips can be replaced with 120 chips is wrong.

Easy way at this point to way at this point to see if chips are the problem is to UNSOLDER AND REMOVE BOTH CHIPS. Make sure not shorted connections and power set up---set will function without the chips but look terrible.

Try Suburban Electronics for the correct chips----only safe replacement for them is the 150 chip----stk-392-110 and stk-392-120 are not interchangeable.

The blinking light indicates a short.


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Panasonic projection tv pt-53wx52c no picture red light flashing 3 times have sound

3 times red light flashing is an error code that indicates problem in convergence output section, please check and replace convergence output chips and pico fuse nearby. Chips replacement in circuit board requires soldering work and local tv repair shop will help you if you are not familiar with soldering.
Hope this will help.

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I have a Samsung HCM4715W and it will not turn on. The remote turns on the tv but ther is no picture or sound. There is a red light on the front that flashes. I counted the flashes and it's 22211.

Go to Encompass Parts Distrubtion for List of Parts and Prices to your TV type in Model number.
You need to replace either the convergence board or Both ICs on convergence board they are big black ICs STK392-020s Mats has them 1-800-628-1118
Covergence board# AA95-02002A

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Same problem. Heartbeat sound, no picture, no sound....

If you have no audio or video and the TV is making a chirping or clicking sound the most likely cause is the convergence chips have shorted. You can get the parts and instructions on how to do the repair from

Jul 22, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Hitachi 43UWX10B 43" Power Light flashes Continuously

I doubt if its the fuse. We just helped a customer with a very similiar problem. Its more likely that the convergence IC have failed and shorted out. When this happens one of the symproms is that the TV will shut down and chirp. Goto and click the contact us button. They can provide you with more instructions on how to test if this is the problem.


Jun 16, 2009 | Hitachi 43UWX10B 43" Rear Projection...

1 Answer


Could be shorted convergence chips. There are two of them in the TV. If they short they will shut the TV down. One quick test is to desolder both of them...then power the TV on..if it fires up the chips were shorted and would need to be replaced. You can get a complete kit from

Mar 11, 2009 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Convergence Board (I hope)

check this out I have the same problem check your solder spot make sure the solder points are not touching one another, that could be one of the reason is doing this or just to make sure you can desolder the stk chips clean the holes where the pins go trough the board and power the tv with board and if the tv start fine if could be bad stk chips be very careful when desoldering or soldering good luck about another is not worth it they cost too much around 350-450

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Convergence problem then no power up after replacement

Check to ne absolutely certain that all the wires are plugged back in correctly, also if the wires are correct check the resistors near the convergence ICs one or two of them are likely open as well.

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No power,red power lights keeps flashing.

I had the same problem with the 47" version. I called the Sears technician who tried for more than an hour to fix the problem, even calling Panasonic. Final solution: a board repair for $550. Now I have a plasma and a big desk.

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