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HAVE A 51G500A MODEL AND ALL OF SUDDEN IT SHOWED RED LINES AND SHADOWS ITS NOT BEEN MOVED OR TOUCHED I TRIED MAGIC FOCUS ON AUTO AND MANUAL CANNOT FIX IT CAN YOU HELP

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Your symptom sounds like a damaged convergence IC.

There are two and large IC’s that control the convergence in a big screen set. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110, and they are located on the signal board (on the left as you look into the back of the set).

Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.
There are also two resistors on the front of the board located in the middle that are fusible link resistors, these should be checked for opens and replaced if they are found so.

I would suggest that you contact a service center in your area for a complete diagnosis and repair, as this type of repair can get a little tricky. But if you want to repair the set yourself, just remember to be careful. The capacitors and CRT’s can hold a charge and may shock you.


If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.

I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.

You can also try http://www.tvrepairkits.com/ , I have not tried them yet, but they do carry OEM or better parts.

I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
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If you need further assistance please comment to this post and I will try to help you further.

Posted on Sep 28, 2009

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  • Hitachi Master
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The 51G500A uses two convergence chips(IC chips) for convergence output.

Most of these sets use a STK-392-110 AND a STK-392-150----not often you see a set with two different number chips used---the 150 is a higher current device than the 110 chip----You need to replace both(a good idea is to replace both with the 150 chip---they last longer)

You will find them (as you look from the back of the set) on the right side on either one large or two separate metal heat sinks---the chips each have 18 pins and are black in color with the STK number printed in white on the face of them(they are about 2 1/2 inches wide x 1 1/2 inches tall).


Usually just both chips need to be replaced and the set adjusted--sometimes there will be a resistor near them discolored or burnt--you need to look for this if you do this repair---You can buy both the chips on Ebay for less than 15 dollars plus shipping.

If you are not able to do this yourself shop around your area---most shops charge 300-400 for this type of repair----I have done hundreds of them here and charge 200-250 and do the repair in the customer's home----if a shop tells you it has to go to the shop keep looking---any good tech can do this repair in your home in about a hour.

I am here to help people---if you need help or advice or have ANY questions reply to this posting here and I will try to assist you.

REGARDS, SD TECH

Posted on Sep 28, 2009

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