20 Most Recent Toshiba 42H83 42" Rear Projection HDTV-Ready Television - Page 4 Questions & Answers


What you might be experiencing based on your symptom sounds like a damaged convergence IC.

With any Projection Television that has a damaged convergence IC, you do not want to continue the use of the set. If the IC’s continue to fail they will cause a short in the power supply and cause your television to not power up, and possibly damage the CRT’s in the set.

With that aside I have some support suggestions that I have put together that may help you make an informed decision.

You should be able to get a local service center to repair this at your house for between $350.00 - $450.00, If you want to repair this set yourself, I have some instructions below that will be a help to you.
While it is not a very hard repair, this repair can be a bit tricky. If you have a 45W soldering iron, solder, solder wick, and heat sink compound you can repair it yourself.

When you remove the old IC's, please be sure to remove all of the old heat sink compound, as it can act as an insulation for the new IC's and cause them to overheat. I usually clean the heat sinks with alcohol and a small rag.

There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets only have one. If you only have one, it is right in the middle of the set on the center circuit board. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110.

Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.

If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is
http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.

I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.

You can also try
http://www.tvrepairkits.com/ , I have not tried them yet, but they do carry OEM or better parts.


I hope this information allows you to resolve this issue.
If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up)
Please Note: If you cannot rate this post with the highest rating, then please do not leave any rating. I am doing this for free and I do not think that any rating other that the best is needed.
If you need further assistance please comment to this post and I will try to help you further.

Thanks for using FixYa
asnowman


I have attached some photos of really bad convergence problems; your picture may not be exactly as bad as these.

c8f5ee7.jpg

c630b2e.jpg

Toshiba 42H83... • Answered on Nov 02, 2009


Check all wires cables go to the tv,shakes,jiggles might,see the prob.than change the wires cables.Not wires cables,than ur main video board is the prob.must change.

Toshiba 42H83... • Answered on Oct 27, 2009


you can try cleaning them with just damp water and then drying them once there dry reassemble them and see
its a good bet you should probably be looking for a set of screens

Toshiba 42H83... • Answered on Oct 25, 2009


To fix the shaky picture on the toshiba rear projection tv model number 42h83. You need to either replace the 13 capictors on the hyper module or simply replace the hyper module itself. It's cheaper to replace the caps, but you'll need decent soldering skills to do this. You can replace the entire hyper module with less soldering skills, but I believe the module costs about $100, maybe alittle more. You can find the entire fix by googleing "hyper module". Good luck and I hope this helps

Toshiba 42H83... • Answered on Oct 24, 2009


a) having sound on your Toshiba 42H82 means horizontal deflection circuits are partially OK. b) one reason why you do not have a picture is the heater of the CRT check if there is at least 4 V ac on its supply. assuming it is OK we proceed c) another reason why you do not have picture is the G2 ( Screen) voltage, might be low on the screen settings each CRT have individual settings we just presume it is from the main supply, since the 3 guns are not emitting lights. d) another reason is the blanking circuits that mute the Video circuits to produce raster on the screen. e) in addition to d) these circuits are connected to the ABL of the horiz circuits. f) all of these can be done with a help. hope i have helped you, thanks for using Fixya!

Toshiba 42H83... • Answered on Oct 18, 2009


You have one or more bad convergence amplifiers. Best to replace both convergence output ICs as well as check low value resistors associated with them.

Toshiba 42H83... • Answered on Oct 16, 2009


Hi, I used to work in Best Buy and one of the key things about rear projection TVs and the reason they push those service plans on you is that the tubes/colors need to be calibrated each year. You can do this yourself by checking out the following website:  

http://lgknowledgebase.com/kb/index.php?View=entry&EntryID=3229 

Hope this helps :) 

Toshiba 42H83... • Answered on Sep 17, 2009


Absolutely! if the consumer control has failed to rectify the problem you need expert help. There are two control boards near the power supply 1 or both are involved and more than 90% of the time both of the boards have to be replace otherwise the problem will occur again in a short time.
It is not a DIY project for the unskilled as it has to be tuned correctly when it is installed.
Better to leave it to the professional

Please rate the help to keep the FREE service online ++++

Toshiba 42H83... • Answered on Aug 31, 2009


This set uses two STK-392-110 convergence IC chips; both need to be replaced and any of the resistors around them(usually low value between 1.5 and 2.7 ohm) all need to be checked with a multimeter(like checking a fuse).

YOU can buy both chips on Ebay for less then 13 dollars plus shipping(look for Sewsales----called Surburban electronics- they have the best price and give a 6 month warranty on the parts.

After the chips are replaced(you need to unsolder both) apply heat sink grease to both of the new ones and solder them in. If you need more help with this let me know here--the hard part of this repair is getting at them to unsolder and remove them.

If you cannot do this repair yourself, look in your area--usually a good tech can do this repair right in your home--some shops are charging 300 or more for this repair--I do it here for 200-250 in home for most sets.

After the chips are replaced the set needs to be adjusted with the original remote---MAKE sure if you get someone to do this for you that they change BOTH of the chips.

200-250 is a price that you could not replace the set for--This is the slow time of year for most TV shops--shop around and if they want to 'TAKE IT TO THE SHOP" KEEP looking.

If you need any help or have questions let me know here.

I do this for free here so if this has helped you please give me a vote here.

Regards, SDTech

Toshiba 42H83... • Answered on Aug 26, 2009


If it is a 42h83, this is a 2003 model that uses two STK-392-110 convergence IC's---both need to be replaced along with any open resistors around them(most of the time only the two IC's are bad but whoever does the repair should check to see if any of the protect (called feedback) resistors are open---they are checked with a meter just like a fuse.

I do this here for free so if this has been helpful give me a vote here. If you have questions or need help:

[email protected]

Toshiba 42H83... • Answered on Aug 22, 2009


this sounds like a convergence loss... the most likely cause of this is what is known as stk's or convergenc ic(chips) have gone bad.. also it cound be the output resistors. most likely need replaced

Toshiba 42H83... • Answered on Aug 20, 2009


the problem is going to be a bad NEXT HYPER UNIT module. this is the digital scan card in the tv. try using the componenet inputs and if the tv works ok then you know that the HYPER UNIT is the problem. the reapir process for a "do-it-yourselfer" is too involved and would recommend a serivce center for this repair.

Toshiba 42H83... • Answered on Aug 19, 2009


I have the same problem i am looking to solve it

Toshiba 42H83... • Answered on Aug 11, 2009


It sounds like a convergence problem---go into the customer menu and select convergence---set should offer center and multipoint adjustment--in the multipoint look to see if the outer crosses adjust--if red or blue will not adjust somewhere--bad convergence IC's.

Toshiba 42H83... • Answered on Aug 07, 2009


Most of these Toshiba sets have a "hyper board" that processes all the signal and a lot of them are going bad---lots of surface mounted filter caps on the board dry out and usually it begins that lines in the picture and after several minutes the problem slowly clears up and or goes away---as time goes on it takes longer and longer for it to go away----For most of these sets the only way to repair is remove the board and send it out for rebuild--rebuild of the board and labor may be more then the TV set is worth.

Toshiba 42H83... • Answered on Aug 07, 2009


They are adjusted through the convergence control in the menu.If they do not adjust, the convergence IC's are bad and need to be replaced.
Call a good TV Tech.

Toshiba 42H83... • Answered on Jul 30, 2009


from your decription i would guess that you have a bad hyper module ideally you need to replace this but their hard to find. so toshiba has issued repair instructions for repair of this board which involves replacement of very small micro capacitors. our shop ussally charges around 200 for this repair. this is not a easy repair you need experience tech to solder becuse you can easly damage this nonreplaceable board

Toshiba 42H83... • Answered on Jun 17, 2009


Your TV most likely has a Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together convergence repair kits for most models.

The kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, etc. Everything you will need to do the repair yourself.

Toshiba 42H83... • Answered on May 19, 2009

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