Question about Hitachi 57TWX20B 57" Rear Projection Television

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My 57twx20b rear projection tv appears to have 3 images that are not aligned I have been advised it is called convergance failure and the IC's called STK's need to be replaced. What are STK's and how are these replaced

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  • Hitachi Master
  • 3,459 Answers

This is a common problem. Its called a convergence failure.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3D
  • Colors wont align
  • Video may look distorted
Problem #2 CRT Fluid has clouded over. Symtoms
  • Dull looking video
  • White looking video
  • Halos around objects
  • Red/Orange looking video

You can see some examples and find a fix here...

My 57twx20b rear projection tv appears to have 3 - bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Posted on Feb 03, 2010

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1 Answer

Our samsung HCl4715W tv is all connected right but our picture is scrambled where you see double exposure and the color is off. Can not find our manual. any suggestions?


The problem of your tv is the convergence. Projection tv set has a 3 colors red,blue and green this 3 colors must be properly lined up to look the video normal. When this 3 colors is not properly aligned the video will produce a double image of color or like a 3d or wavy. In order to fix this problem you should adjust it in the menu program of your tv you should move any of the colors to up or down, left or right if you cannot align the 3 colors the problem is the convergence ic it must be replace. To locate the convergence ic you should remove the back cover of your tv but be sure to unplug your tv, you will see this ic attached in a large aluminum plate it has a marking of stk--- and followed by a numbers. or you could contact a service technician do do it for you and save you from stress. Good day and best regards.

Jul 17, 2011 | Samsung HCL4715W 47" Rear Projection...

1 Answer

Red and blues will not aligning on projection tv


You will first off need to get the training manual on this TV set, so you will know what this set is all about. The problem you have with your set is the convergence IC's need to be replaced, then you will need to understand the service manual so you can go in without destroying the set, and make small convergence corrections. The training manual is available here http://www.tacpservice.toshiba.com/TACP/training/TV/pjtv05f.pdf You will need to know how to solder, as well as certain terms used in this training manual. If you have no electronic background, I highly advise that you call in a pro to assist you in the replacement of the IC, but have this manual available to the technician, as it might save you a few bucks. Good Luck with this repair.

Jul 29, 2007 | Toshiba TW40F80 40" Rear Projection...

1 Answer

My t.v.focus is like double vision and the color is not right.


convergence failure that tv has 3 CRTs-cathode ray tube- and it has a circuit that keeps each picture projected from the tubes aligned together called convergence. so if you have a picture that has 3 pictures of the same image in red green and blue then it is defintely a convergence failure. the part numbers of the parts causing the failure are STK394-160 and there also can be some burnt resistors in the same circuit.

Jan 06, 2011 | Hitachi 57F500 57" Rear Projection...

1 Answer

I have a 53 inch hitachi ultravision #53UDX10B Its out of focus and when you press the magic focus button it trys then pops up with the # 4 in the corner is this a convergence problem or what ?


Yes, you have a convergence failure. Usually requires replacement of 2 X STK ICs and any burnt resistors associated with the function that is faulty.

Look at the user menu and compare with images on our Convergence Gallery. Try to adjust in the convergence adjust menu. Identify the functions that do not work and make note. When you replace the ICs, pay special attention to the low ohm resistors for the non-working function. They will be located near the colored plug associated with the non-working function. If red vertical will not adjust, check resistors near the red plug.

There are many posts and websites that offer "new and improved Convergence IC substitutes. My advice is to use the original part numbers and replace any burnt resistors with original values. Many ICs purchased on the Internet are very poor quality and do not work. Many users get substitute replacement ICs and never get their TVs working again.

If you have other electronics repair experience, this job may be done with some chance of success. If you have no experience, there are many secondary problems that can and usually do appear. Determining how to fix the secondary faults and how to correctly align the TV is difficult without prior convergence repair experience.

Some of the common problems encountered are:
1. Poor solder techniques, resulting in damaged PC boards or poor solder connections.
2. Poor quality or wrong parts installed and recognizing this problem.
3. Resistors open or burnt. Some resistors are weakened by the initial faulty IC. Replacing with a "good" IC and starting the TV causes the weakened resistors to burn up. IC may be ok but there are one or more open resistors that measured ok when ICs were being replaced.
4. Wrong ICs used, causing resistors to burn up.
5. Resistors that measure normal and become faulty when heated by current flow.
6. Recognizing that convergence circuit is repaired correctly and alignment is needed.
7. Major alignment in service menu required because data is corrupted by multiple tries of magic focus or manual adjustment while faulty circuit conditions exist.
8. Major alignment required because user adjusted centering rings or physically changed mechanical focus adjustment, then mis-adjusted convergence settings trying to correct mechanical alignment faults.
9. User has not connected plugs and connectors correctly and caused secondary damage or mis-alignment trying to correct secondary issue.

Physically replacing the ICs may appear simple but recognizing if a fault still exists or if correct repair is required causes many attempts at repair to fail. Keep it simple. Replace with good quality original part numbers, measure suspect resistors and adjust only what is necessary.

There are only 3 things to fix, IC failure, resistor failure and user induced secondary faults. Data processor and memory is bulletproof.

easyab

Apr 22, 2010 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

The image appears to have excessive yellow tint. and there are no images coming thru the blue projector


This is a common problem. Its called a convergence failure.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3D
  • Colors wont align
  • Screen may look distorted
  • TV shutdown - does not display video
Problem #2 CRT Fluid has clouded over. Symtoms
  • Dull looking video
  • White looking video
  • Halos around objects
  • Red/Orange looking video

You can see some examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Feb 20, 2010 | Philips 55PW9363 55" Rear Projection...

2 Answers

65" rear pro. Convergence IC Repair


This is a common problem. Its called a convergence failure.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3D
  • Colors wont align
  • Video may look distorted
Problem #2 CRT Fluid has clouded over. Symtoms
  • Dull looking video
  • White looking video
  • Halos around objects
  • Red/Orange looking video

You can see some examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Feb 18, 2010 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Red shadow on images and letting


Check your convergence, Using your original remote go to the Menu, in the settings select convergence, try to align the colors to each other.

Apr 20, 2009 | Sony KP-51WS510 51" Rear Projection...

1 Answer

My big screen projection philips tv screen is bleeeding


Mark, if red & blue are seperated from the normal image then the convergence circuit has failed, this means the IC`s will have to be removed and replaced as well as any resistors that may have burned when the chip(s) went bad, the alignment that must be performed after the new IC`s are installed can be a pain especially without the service manual, I`d advise a tech for this one, video-tek

Feb 04, 2009 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

Problem with TV screen?


Good Day, deon453;
Sounds like a convergence problem.
Corrective Action: Replace the defective Convergence Output IC Part Number 23905094 (STK392-110) using the revised “T” version IC Part Number 23135090 (STK392-110T). When Convergence Output failure is
detected, it’s recommended that both IC’s be changed to the “T” type IC
version.
Good Luck, Big Irish.

Jul 02, 2008 | Toshiba 42H81 42" Rear Projection...

1 Answer

Picture is blurred.


SHANK-YOU MOSTLIKELY HAVE THE INFAMOUS CONVERGENCE IC FAILURE.PART #STK392-??? YOU WILL EITHER CALL A TV TECH FAMILIAR W/ THIS REPAIR OR REMOVE THE PC BOARD WITH THOSE TWO PARTS ON IT AND UNSOLDER THEM ,ACQUIRE NEW ONES AND RESOLDER THE TWO NEW ONES BACK INTO YHE PC BOARD.TV TECH IS ABOUT 300.00 DOLLARS.DO IT YOURSELF FOR ABOUT 40.00 DOLLARS. GOOD LUCK JOE TV

Nov 16, 2007 | Sony KP-51HW40 51" Rear Projection...

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