Repairing Our Big Screen Television

Panasonic_TV_small.jpg

A frantic call. Panic! “My big screen TV has messed up!” Aaron is a devoted sports aficionado. He has had a Panasonic 53″ rear projection television for about 6 years to enjoy his baseball and football in all their glory.

Now, suddenly, the picture looked like something requiring 3-D glasses to enjoy. The red, blue, and green portions of the picture were out of “convergence” with each other. Using the built-in adjustments accessed by the remote didn’t help. Reality was setting in — major repairs were on the horizon. Calling one local serviceman produced an estimated minimum of $325 to repair.

Turning to the internet we used Google to see if others had similar problems. Indeed they did. Our best hope came from one guy’s blog where he actually repaired his own television with this problem. Chris Palmer’s instructions were for a 47″ Panasonic very similar to Aaron’s 53″. Following his instructions – if we could – would cost under $50. We decided to risk it.

I have been using a soldering iron since junior high school (over 40 years) so I thought it was possible. Here was our procedure:TV_module.jpg

  • Order heavy duty replacement convergence amplifier modules from www.electronix.com (replace STK392-110 with STK392-120s).
  • Remove rear of television and take digital photos of internal power and signal connections (turned out to be very important)
  • Pull out wooden frame on which circuitry is mounted. Unplug cables to make this possible.
  • Cut the 14 leads of each module then unsolder each cut lead and clean out solder hole. (Big red arrow in photo points to modules.)
  • Put heat sink grease on back of each module, position into place with leads through holes and solder in each lead.Panasonic_TV_02.jpg
  • Spend a nervous and frustrating hour figuring out where each cable plugs back in.
  • Wipe off lenses and mirror to remove fine dust accumulated over 6 years.
  • Re-insert circuitry frame, reconnect power and satellite inputs, turn on. . . and hope!

IT WORKED! Slight mis-convergence was easily adjusted using the remote’s onscreen guide. Cost including shipping: $40. Time: 2.5 hours.

The end result was the resurrection of an unusable television and saving $300+ at the same time. Further, the image is now brighter and more color saturated than before.

3 Responses to “Repairing Our Big Screen Television”

  1. Brooke Says:

    I have the same problem!! We thought it was the light bulbs that project the red, green, and blue lights, so we took the back and front cover off the tv and tried to adjust the positions of the lights, but it didn’t work out very well.. It moved the colors, but they didn’t line up straight…
    I’m so glad that you posted this, now i know what to get for our t.v. and hopefully save us some money! You think you would suggest us to bring it into a television repair shop?? Or you think it would be simple enough for us to repair from home?
    You can post your response on here or you can just e-mail me at joysee87@yahoo.com
    Thanks! :D

  2. Richard Cravy Says:

    Doing the repair yourself is not for the “faint of heart,” but is reasonable for someone with a soldering iron and some skills replacing electronic components. If you doubt your abilities, perhaps you can print out our info and take to a TV shop to see what their charges would be. Unfortunately, some shops will only replace the entire circuit board ($500+) instead of doing the component repair. Good luck! P.S. Do you know any electronics “geeks” who might help you out?

  3. John Seward Says:

    I have to replace the convergence modules in my 2000 Toshiba 61h70 projection tv.I have the modules but I do not know the correct proceedure to take out the circuit board to get to the convergence modules.Would you be able to tell me the correct way to remove the circuit board that the modules are on?Thank you,John Seward.