Question about Panasonic PT-53WX42 53" Rear Projection Television

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Replacing STK Modules in a Panasonic Rear Projection HDTV

I've read the posts on this board from February and March regarding replacing the STK modules in Panasonic rear-projection HDTV's. I have a 7-year old Panasonic and am having the same convergence problems with it that other people seem to have had prior to replacing the STK modules. I found a Sanyo STK392-180 module for about $15 and I'm considering attempting the repair.

Before I order the module(s), I have a few questions about the prior posts:
1. Is there more than one STK392 module in this HDTV that will need to be replaced? The prior posts all talk about getting an STK392-180 rather than a -110, but seem to suggest that there is more than one of these modules which will require replacing. I haven't opened up the back of the set yet and won't do so until I have the parts. How many of these modules do I need to order?

2. Most of the suggestions recommend against ordering generic brands and instead suggest ordering name brands and paying a bit more. The module I've located was made by Sanyo. Is this a quality product?

3. I saw on epost which suggested checking for blown resistors. Is this a visual check or do I need a meter to perform this test?

Thanks for any hints, tips and recommendations.

John A. Franczyk

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Hi there.

If you look up the datasheets for the 392 series, you'd find more differences than power and voltage ratings... Using a similar IC (even if it is the same series) may make it difficult, if not impossible, to converge. It's recommended to change the 2 ICs as a matched pair. Since one already is failing or failed, the other probably isn't too far away.

The resistors mentioned are to bias each output stage for proper deflection and must be within tolerance. They're precision blue flameproofs, so if anything really heated up from a bad IC you'd easily catch any browning / burning. Red is IC7001, blue IC7002, and green is split between the two ICs.

Tha advantage getting a factory supplied or authorized distributor part is you know the LOT NUMBER has been approved by the manufacturer. Generics or unusually cheap originals are often rejects from the manufacturer as being out of tolerance.

The originals are only $29 each directly from Panasonic. Why go through all the effort tearing the thing apart twice to save $30?

Good luck, Mark

Posted on Nov 28, 2008

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