Sharp 55R-WP4H 55" Rear Projection Television Logo

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Posted on Feb 27, 2009
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Problem with stk's & low olm resistors on 55 in. Sharp

I replaced my stk's on my 55 inch sharp projection tv.One month later the tv is doing the same as before I changed the stk's(blinking view timer).I did not check the low olm resistors,I am not sure how to check them.Can you check them while they are on the board or do they need to be removed from the board to check resistance?And are the low olm resistors that affect the stk's only on the board the stk's are on?I suppose I will need to replace the stk's again,don't you think?I realy appriciate all your help.

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  • rlawrence947 Feb 28, 2009

    the stk's i replaced were stk-392-040.And you say the low olm resistors that need attention should be located on the same board as the stk"s?

  • rlawrence947 Feb 28, 2009

    the stk's I replaced were stk 392-040.And you say the low olm resistors that need attention should be located on that same board as the stk 392-040?

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  • Sharp Master 1,779 Answers
  • Posted on Feb 27, 2009
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It's always best to remove one leg, however there tolerance is so close you should be able to get an exact ohm reading, and I mean exact. Some are connected in parallel so if they're 6.8 ohm then you'll read 3.4. What is the number of the STK's you changed?
Yes, I would replace them again.

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Convergence IC failure is very common. 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.

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Bill
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