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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Re: Problem with stk's & low olm resistors on 55 in....
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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It could be one of two things: Either a bad solder joint or convergence IC failure.
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.
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
The tv have a problems known as a convergence problems,it dead.The tv have colors lines R,G,B misalignments,have colors shadows pictures or 3D pictures look alike?The tv convergence board have dead 2 STK convergence ICS and some or all of it resistors are dead too.These parts on the tv convergence board,must be replaced to solved the tv pictures convergence problems.The shop,will cost u like $300-350 for parts and labors.
That's a convergence issue. It's an electronic failure in the convergence circuit. Most likely cause is defective convergence output ic's. Depending on make and model, they are usually stk's and need to be replaced by a qualified service technician as those ic's can cause other components to faill also (i.e. resistors). There may also be numerous alignments reaquired after those ic's are replaced...
Premtech suggest you unplug that. I unplugged the bigger of the 3 and it came on but looked horrible. Ordered up some stk392-040s installed and my tv came on still looked funny. After talking some via email wiht premtech I found that one the low ohm resistors was faulty replaced it and bam back to sittin on the couch and enjoying tv.
I called SHARP electronics and didn't stopp calling until I got the head of cstomer relations. After about 18 months I finally got them to replace the digital board assembly with no cost to me. They agreed this was a defective part and at first offered to pay half ($537 - my half). again, I was persistence with this being a defective part. Key here is don't give up! Sharp needs to stand behind their product, period. I don't care if I am out of warranty.
Here is the phone number I have for Customer Relations
Hope this helps.