Question about Panasonic PT-53TW53 53" Rear Projection HDTV-Ready Television

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I've replaced the STK392-110s but Red Vertical convergence is still bowed

I have a convergence problem. The Red colour is several inches up from where it should be, and it is bowed such that it is more severe in the lower center of the screen. I replaced both STK392-110 convergence voltage regulators but... no change. I'd appreciate any suggestions. Someone suggested changing the feeder resistors - anyone got the specs on these?

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  • carne4 Sep 12, 2007

    One of the resistors was discolored and open-circuit. This is R7013, a 2.2ohm 2W resistor associated with IC7001 (STK392-110). I'm ordering the part. Anyone got a circuit diagram please? It's a Panasonic PT-53TW53G rear-projection TV. Thanks.

  • carne4 Oct 24, 2007

    I ordered the resistor from Panasonic. Thanks SRTECH for the tip about clipping the legs of the old resistor since unsoldering it might have needed a little too much heat on the board, so it was easier to do it your way. After clipping away the old discolored i.e. burnt out resistor R7013 I soldered the new 2.2ohm onto the old legs. Tip: when reassembling all the connectors onto the board I noticed that for one of them it is possible to plug it onto the board incorrectly. It is the rearmost chunky black connector (it has 4 wires connected to 4 of the 6 positions on the connector). Turned the TV back on and IT WORKS FINE NOW! One slight problem remains - the remote control is cracked and so I can't complete the fine convergence adjustment. Where can I buy a new remote control for this PT-53TW53G ?

  • Bill Apr 09, 2008

    I replaced the STK392-110s also the resistors but the red is still having problem, HELP

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Hi can you please post if you fix the problem? I have the same set and it just picked up this problem today -- must have come from the same production run as yours!

Posted on Sep 13, 2007

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Some are 2.2 ohms/3.9ohms/4.7ohms if you dont have the service manual and your not sure which b+ resistors are gone and from where they get the drive b+,call a tech and have it repaired

Posted on Sep 07, 2007

  • g w Sep 12, 2007

    you already have the location and value to replace it your ok,check the other ones anound it and remember thery use duplicates on both ic;s eg: r7013 2.2 ohm r7014 for the opposite side but the 2.2 2watt seems like its a b+ line feed, clip the legs on the opened one and tack it in from the top of the board and see what happens you should be ok if you already replaced the amps.

  • g w Oct 24, 2007

    call panasonic or sears for a replacement remote don't take a sub if offered you can still get the original one ,you will loose form function and features with a sub.

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Sony model #kp51ws500. Common problems for screen appearing warped


Need more details about how the screen is appearing warped.

if you have color separation and distorted image (warped,bowed, etc), then your Convergence ICs have failed. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.

Try This:
When you notice the symptons Use this simple test to verify.
Go to the users menu on the tv.
Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.

If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section.
If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.

If you can move both in each direction then the problem is something else.


Note if one STK chip fails, you replace both regardless.


Note: The STK chips are black about 3 inches long and will be mounted against a large aluminum heat sink (metal fins). They have about 20 pins on them. I believe they are STK392-560s in that set.

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You will need to replace both convergence ICs they are STK392-110 and you will also need four 6.8 ohm 1watt resistor. You can get replacement ICs and resistors at the following link with free installation instructions.
http://servicemanuals.vstore.ca/

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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

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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
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Has anyone had problems with connecting an 'HDMI to HDMI + SPDIF + RCA L / R Audio Extractor Converter (HDMI input,HDMI+ Audio output)' to a Panasonic PT-53TW53? I have a TiVo Premiere hooked up to my Panasonic PT-53TW53. I use the HDMI out, and RCA R+L outputs on the TiVo, and hook up to the digital in connections on the TV. The conversion of the HDMI out is via an HDMI to DVI cable. This has worked perfectly for years, but recently I wanted to disconnect the TiVo and replace with my Roku or Amazon Fire TV. Both have a single HDMI output. So I purchased an AGPtek HDMI to HDMI + SPDIF + RCA L / R Audio Extractor Converter (HDMI input, HDMI+ Audio output) box, hooking up the HDMI output from the Roku or Fire TV to the input on the extractor/converter, and simply disconnecting the HDMI to DVI and RCA R+L outputs from the TiVo, and plugging them into the outputs on the converter/extractor. The converter/extractor has a 3 position switch: PASS, 2CH audio, or 5.1CH (via and SPDIF or Toslink cable). I have had 2 of these converter/extractors, and with both the Roku and Fire TV I got the same results with both converter/extractors: With the switch on 2CH, which is where I understand I should get HDMI video and 2CH RCA audio, all I get is the RCA audio. No video. If I switch to PASS I get video with no audio. Of course on the 5.1 setting I get nothing, since the TV does not support SPDIF. Yet I see reviews all over Amazon indicating folks are using this converter/extractor for this very purpose, and it is working fine. I can't possibly imagine that it is some sort of incompatibility issue with the TV, since the TiVo has worked (and continues to) fine for years. Any ideas?

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