Question about Panasonic PT-47WX49 47" Rear Projection Television

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Smoking Replacement IC'S!

I have the panasonic ptv47 projection set and ordered the sanyo stk394-160 replacement ic's. After soldering both new ic's to board and turning set on, i see smoke and the set turns itself off. Checked solder joints to ic's to make sure their not touching and as far as i can see they are not. Is there anything else that could cause the smoke? The lamps do not turn at all by the way. Could I have fried something on the board when I desoldered the original ic's? Help!

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  • Panasonic Master
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You used the wrong ICs STK392-110s upgrade to 392-180s.

Posted on Nov 29, 2008

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Posted on Jan 02, 2017

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2 Answers

Tv turned itself off. turn power back on, picture


Your TV is experiencing a convergence issue as indicated by the 3 blinks. The only way to fix this is replacing the convergence ICs. It is not a hard task to replace these ICs. You just need to know how to solder and work on printed circuit boards.

The convergence ICs are mounted on a large heat sink and are marked with codes starting with the letters STK and there are two of them. You need to replace both.

Look for the heat sink with two ICs mounted on it and check the markings.

Once found, cut the IC legs with a small side cutter and unscrew it from the heat sink. Remove the legs left soldered on the board.

Take note of the IC markings for ordering the right part and how it was installed. Don't forget to buy along with the IC a thermal compound.

Check the pico fuses on the same board. Most likely you will find a blown one. These fuses look very much like a resistor, not like the usual transparent fuse, and usually yellow.

Once you have the replacement ICs, put it on the board in the same way as it was installed before. Make sure the screw holes are aligned before soldering the legs into the board.

Put a reasonable amount of thermal grease/compound between the ICs and the heat sink and fix them with the screws.

Double check the board for any splash of solders that might cause a short circuit and damage the board.


Dec 07, 2009 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

Bowed picture with color divergence


Hi, The Mitsubishi TV set you have uses two of the STK 392-570 convergence correction IC's. These IC's can be purchased from here http://www.mcminone.com/search.asp?keyword=stk392-570&btnSubmit.x=6&btnSubmit.y=7 These are the original Sanyo replacement type IC's. No aftermarket cheapo ones. Unfortunately this board that the IC's come on is part of the main Printed circuit boards. If one was available for a replacement, it would cost in the range of about 400 bucks. The way it sound that your TV set is intermittent, is that the IC's are not bad, but need to be simply re soldered. This happens a lot with this model number or set of convergence IC's. To tell you the truth, I have had to replace these types of convergence IC's very rarely. Mostly when the set come on with bad convergence and does not change. Find a friend or a neighbor who can solder, find the black STK392-570 IC's standing up against a large metal plate, turn over the printed circuit board and resolder all of the pins, just double check all of the solder points for solder bridges. Good Luck

Aug 02, 2007 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

Panasonic (PT-56HX41PF) rear-projection tv with no picture


The three blinks indicates a convergence IC fault. The convergence ICs must be replaced with the manufacturer replacement part. Use only the original replacement part. Your set uses STK392-110 convergence ICs.
These ICs are mounted on a large heat sink. Yes, you can replace it yourself and save few hundred bucks. But you must be knowledgeable enough on how to solder, resolder and use a multimeter.
You will need:
  1. Convergence ICs
  2. Heat sink grease or thermal compound
  3. Soldering iron
  4. Solder lead.
  5. Digital multimeter
  6. Solder pump
  7. Small side cutter
Feel free to inform me if you decide to replace the ICs yourself

Dec 03, 2009 | Panasonic PT-56HX41 56" Rear Projection...

5 Answers

Stk394-160 Convergence IC, number on top right of chip


I have read both of the above posts.
On the first post, the 'codes' are the date codes. Both parts were manufactured in 2007, and will have no bearing on performance, should both lots not be the same as they were manufactured on different weeks.

On the second post:
There is allot of misinformation on the web pertaining to the applications of STK394-160(E)'s.
This special device was manufactured by Sanyo exclusively for Hitachi PTV's. They will not work in any other projection TV's except for Hitachi. Let me say this again, "They will not work in any other projection TV's except for Hitachi." The 'E' suffix is the nomenclature for PB Free or lead free. All STK394-160's were manufactured as 'lead free'. The 'E' will not appear on the part. Here's more information:

For Hitachi PTV's ( Projection TV's ), STK392-150 replaces STK392-110. STK392-120 should be replaced with STK392-120 or STK394-160's in matched pairs. The -120's are 4 amp devices while both the -110's and -150's are 3 amp. We market replacement kits for -110's that contain two original Sanyo STK392-150's and the associated resistors along with solder and resistor designations for all models. We also have an STK394-160 Kit, along with solder and resistor designations for all models.

Prelco electronics is a direct purchaser of STK's IC's directly from Sanyo Semiconductor Distribution. If you would like the real parts, your search has ended. Parts can be ordered on line, or toll free: 888-773-5268, ( 908-429-9999 local ) Sales X 2, http://www.prelcoparts.com
Feel free to contact us via email: sales@prelcoparts.com

Nov 29, 2008 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

Toshiba 42h81


STK392-110 's = replace with Toshiba or Sanyo quality only..
What was the location & value of the resistor ?
An IC, if shorted internally,can prevent the tv from powering up..
Re-check soldered in 5 amp micro fuses F850,851,852,etc
Fix it ! ..............................T.

Aug 28, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Panasonic 55" PT-53TW53G


Thats a strong possibility that the converegence feed resistors could be open. Also double check the wire connections especially the white bridge connectors that are from one board to the other. Also recheck the IC pins for any sign of bridged pins or inadequate solder.

Jul 08, 2008 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

IC replacement Question


Check this site for more info on a rebuilt board becuase I do no think Panasonic will have new boards.

Apr 07, 2008 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

Panasonic TV Repair


You will need to replace or have the convergence IC's replaced. They are soldered into the printed circuit board. You will need to know how to solder also un-solder on solid state printed circuit boards. If you do not know this, play it safe and call in a pro to assist you in this repair. Good luck

Feb 11, 2008 | Panasonic PT-53WX42 53" Rear Projection...

1 Answer

Panasonic pt-51g42v


You might have bad solder joints on the vertical output IC. I do not know where it is located in this set only that it will be mounted on a metal heat sink near three wires that have identical plugs which go to the deflection yokes on each crt tube. Sets vary as to placement of vertical IC. Solder joints should be easily seen if you have good eyes or use a magnifying glass. I do know that the vertical IC will be on the board that has the highvoltage transformer on it (has big red wire). You may have to unplug the board and turn it to the soldered side or just turn the entire chassis up 90 degrees to see the connections. If this is not the problem I don't know how to get into the service mode at this time.Hope this helps

Dec 28, 2007 | Panasonic PT-51G42 51" Rear Projection...

3 Answers

Samsung hcm4215w Convergence board problem


Use PANASONIC STK's.They are expensive,but they hold up!Safe,durable repairs require OEM or BETTER quality replacement parts.

Sep 27, 2007 | Samsung HCM4215W 42" Rear Projection...

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