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You are here: Experts > Home/Garden > Home Appliances > TV/VCR/Stereo Troubleshooting > Failure of Convergence Circuit
Expert: cleggsan
Date: 9/20/2008
Subject: Failure of Convergence Circuit
Question
I have a Hitachi 43FWX20B and had a failure of the convergence circuit last July (I learned all about this from your previous posts.) As you stated, it cost me a little more than $400 to get it fixed.
I am now having trouble again. Last July, we had the red shadow and red warped grid lines....this year, it is green. Can you shed some light on this for me - is there a different circuit for each color? Should last year's repair (new circuits) also help green and blue? I guess I surprised that after 1 year, it is having problems again. I'd like to know what I'm dealing with before calling the repair shop back...my thought is for $400, green should not be giving me problems already (i.e. did he fix red and skip out w/o doing a full job to ensure blue and green were OK)
Answer
Yes, I am sorry to say, the repair is the same. It involves replacing two ICs (Called stk 392 s). If you know how to solder and can replace them by yourself the cost will be much less. You can obtain the chip set for about $20 (there are $7 units on the web, but I don't recommend them) and unsolder the old ones and put in the new ones. There may be a burnt resistor or two as well.
Most Hitachi's use the STK 392-110 chip. They are 18 pins each, so you would be pencil soldering 36 pins. But, if you can solder good in a tight space you can do it. Usually, it is just a replace, put it back together and turn it on. No electronic testing and alignment procedures are necessary (usually).
On the other hand, if you can't/don't want to do the dirty work you should call around; there are many shops now days that are doing this replacement job for $300 - because they do so many of them it gets easier each time for them and they can still make money at the reduced price.
Hope this helps.
C
Here is a discussion about the replacement job that might encourage you or discourage you!
http://www.fixya.com/support/t116226-convergence_ic_stk392_110_vs_stk392_110t
Here is the original Sanyo stk that is under $20 each. Nearly all Japanese manufacturers of tvs use the Sanyo parts.
http://www.mcmelectronics.com/product/STK392-110#?gclid=CLaXsa-v6ZUCFQkiagodD0Zl...
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