Question about Toshiba 55H70 55" Rear Projection Television

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My colors all of a sudden went out of wack

I found the screen where you line up the yellow, red and blue crosses.  Am I supposed to get them all on top of one another?  Some of them don't want to move, is that a problem?

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Today, I started researching the exact same problem on the same model TV. From what I've learned, it seems this model TV (and many others with this part) suffers from a part that runs hot and is not very reliable. The part so frequently goes bad, that one person on the forums bought the parts for "when" not if it goes bad. So, you are far from alone.

The failing part apparently responsible for the color convergence problem you are experiencing is the STK392-110. There are two of them in your TV and together they control the color convergence of the 55H70. Basically, these 2 ICs need to be replaced with the newer and more reliable replacements, the STK394-160 (alternatively, you can also use the STK392-150 or STK329-180, but the STK394-160 is the latest and greatest equivalent for the original part). It is best not to replace the STK392-110 with another STK392-110 (which is what many repair shops will do).

To perform the replacment, you have 2 choices:

1. Hire out a repair at $400-$700. However, often TV breaks again with same problem in less than 6 months because many TV repairman replace only the bad ICs but not the "feeder" parts (i.e. resistors) so these bad feeder parts fry the new ICs also in one week to 3 months. If you hire it repaired, make sure the repairmen has checked the resistors around the IC to ensure they are within tolerance. Also, the repairmen should use thermal compound to reseat the ICs back to the heatsinks. Otherwise the repair won't last.

2. Fix it yourself for under $60. The process can be tricky, but if you are slightly technically inclined and know how to use a soldering iron, you can fix it yourself with less risk of it breaking shortly after.

IMO, option #1 doesn't make sense for a TV that is over 4 years old. That's just too much good money after bad. If option #2 is not feasible, personally, I'd rather put the $400 to $700 or more toward a newer model.

However, if the thought of holding a soldering iron doesn't intimidate you, then option #2 can make a great TV _better_ than new. So, assuming you choose to fix it yourself, this is what you'll need to do (AFAIK). First of all, make sure you only get Sanyo original parts (lots of Chinese knock-offs that don't last). The original STK394-160 is best purchased from a reputable Hitachi licensed dealer (Hitachi apparently makes the 55H70 and Toshiba puts in name on it). B&D, acme-sales, vance, tritronics are all good choices to buy reliable, Sanyo parts from. The STK394-160 is newer and harder to find. Best way to obtain this part if via the Hitachi kit part number X480293. I just purchased the part number X480293 , which I just purchased from Tritronics for $37 + $9 shipping at:

http://www.tritronicsinc.com/storefrontB2CWEB/itemdetail.do?action=prepare_detail&itm_id=567178&itm_index=0

This repair kit includes 2 STK394-160 ICs. Both will need to be replaced (even if only one is bad). This kit includes both ICs, plus some extra resistors. While the ICs are used in many TVs, the resistors have Ohm values that are specific to each TV. So, the resistors in the kit will likely be of no use to you on the 55H70. Still, it is a good idea to test all the resistors in your TV (R7711, R7721,
R7116, R7726, R7736, and R7731. are MF, 1.2 ohm, 2W resistors according to service manual) with a meter and make sure they are still reading the manufacturer values they are suppose to. If their resistance has changed from original specs, they will likely destroy the new ICs. Look for bad solder joints and resistors that test bad or look fried and replace and resolder. Pull the old STK392-110 ICs and replace with the new STK394-160 ICs. Be very careful while inspecting those solder joints and resistors because missing even one minor problem can prevent success. Also, remember to use the thermal compound to reseat the ICs against the heatsinks.

If this doesn't work and you have checked all the resistors and solder joints, the convergence yoke may also have problems. But cross that bridge when/if you come to it.

Some useful links with more instruction and pictures on how to do this replacement:

http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
http://www.fixya.com/support/t287302-put_stk392_110_part_in_tv_fix_double
http://www.hometheatershack.com/forums/service-support/5600-crt-based-rptv-convergence-repairs-5.html
http://www.fixya.com/support/t284130-green_pillow_after_conv_ics_replaced
http://www.fixya.com/support/t116226-convergence_ic_stk392_110_vs_stk392_110t

Note: I'm no expert and basically in the same boat as you. Just sharing what I've learned. So, any experts, please let me know if I missed or incorrectly stated anything.

Dean

Posted on Dec 21, 2008

  • jingof Jan 06, 2009

    Update: last week I finally received the STK394-160 replacement parts, and replaced them in my Toshiba 55H70. I had to go over my work twice (had accidentally shorted two neighboring IC pins together by extra solder). But after a closer inspection of the solder joints, it is working perfectly now - all the crazy colors and shadows are gone, and the convergence crossbars move fine now. In fact, after I went through the manual convergence calibration step, the picture is considerably better than I've ever seen it. And this is strange, but the sound quality improved noticeably as well. Now, why would that happen, after replacing the convergence ICs?

    Hopefully, the convergence won't degrade again over time as others have reported. However, I checked all feeder resistor values and they were reading correctly, so hopefully this fix will "keep".

    How about you? Did you try this repair? If so, how did it go?

    Dean


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SOURCE: My colors all of a sudden went out of wack

Is there an advanced convergence setup anywhere in the menu where the screen displays a grid? If so, you might want to get into that and move along the grid to each section that looks off. Adjust until the color falls behind the gridline, and move on to the next. It can be a time-consuming process, but should take care of your convergence issues.

Posted on Jan 20, 2009

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The Color On My Mitsubishi Rear Projection Tv model- WS-55908 looks to be off, picture looks blue and Yellow.


its sounds like the convergence on your TV needs to be adjusted. (this adjusts all of the color guns in the back of the tv to line them up again, when they get off, you start to get yellow blue or red halos around objects in the picture. In the setup menu on your TV under picture or Display there will be an item that says "convergence" follow the instructions in there so all the crosses on the screen no longer have colored halos anymore.

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  • This is a very common failure on Projection TV sets.
  • Screen looks 3D
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  • One or more colors can't be adjusted when using the convergence menu.
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You can see some example photos and find a solution here...

http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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My colors all of a sudden went out of wack


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Convergence Problem - PT-61HX41


Your TV most likely has one or more possible problems.

Problem #1: 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
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

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5 Use arrow keys to aline the red cross to the white cross.Press set/enter
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