Question about Sharp 55R-WP4H 55" Rear Projection Television

1 Answer

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.

Posted by on

  • 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?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Sharp Master
  • 1,779 Answers

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.

Posted on Feb 27, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

TV just flashes different colors I have a sharp aquos 4K 55 inch I bought like 3 month ago and keep flashing color blue, red ,white , green what should I do ??

I would at this point send it back. It has a year warranty. The problem is most likely the inverter but like I said, return it for a replacement.

Jul 10, 2016 | Sharp Televison & Video

1 Answer

On my HD1080 Mitsubishi projection flat screen 55809 the picture is bowed on top and bottem and it look as if the projectors themselves are offset, but the picture is clearer as you come toward the center....

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

Feb 20, 2011 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

My Sharp 61 inch projection HD tv has a blue band of shadow that dips below the image. Looks like 3D without the glasses.

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.

Nov 20, 2010 | Sharp 61RWP4H 61" Rear Projection...

1 Answer

I have 64' rear projection tv the picture is showing double images. how do i adjust the horizontal focus

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...

Jul 31, 2009 | Sharp 64LHP4000 64" Rear Projection...

2 Answers

Convergence Problem

if you know the STK number you can get them on EBAY or

Mar 26, 2009 | Sharp 55R-WP4H 55" Rear Projection...

2 Answers

Sharp 55R-WP4H view timer blinking


Jan 16, 2009 | Sharp 55R-WP4H 55" Rear Projection...

1 Answer

Sharp view timer blinking

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.

Jan 15, 2009 | Sharp 55R-WP4H 55" Rear Projection...

1 Answer


turn your red screen voltage down till you get grey, your convergence out puts will need replacing
also the limiting resistors usually a low resistance, cheers parts from global look for stk -*.*

Oct 08, 2008 | Toshiba 55H70 55" Rear Projection...

1 Answer

Sharp 55R WP4H

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.
Good Luck!

Mar 29, 2008 | Sharp 55R-WP4H 55" Rear Projection...

2 Answers


Try unplugging the B+ to the convergence circuit and see if it will power up.. If so replace the convergence amps, two STK392-040 and check all the low ohm resistors.

Dec 13, 2007 | Sharp 55R-WP4H 55" Rear Projection...

Not finding what you are looking for?
Sharp 55R-WP4H 55" Rear Projection Television Logo

Related Topics:

235 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharp Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74459 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Jaime Hernandez

Level 3 Expert

2318 Answers

Are you a Sharp Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides