Question about Toshiba 55H70 55" Rear Projection Television

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PROBLEMS AFTER CHANGING CONVERGENCE IC'S

I changed out my stk392-110 after some overlaping red convergence problems to the stk392-150 and now my set has no picture. It sounds like it is going to start up by clicking and speakers poping but no picture. Also the red light starts blinking after a few seconds.

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  • joshrp Jan 04, 2008

    The stk392-150 I bought is supose to be a better replacement for the stk392-110. Around the web alot of people recomend this upgrade the specs are identical between the 2 but suposedly the 150 runs cooler.

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Hi Josh,
I suggest you install a new stk392-110 back in the convergance board. If the set refuses to start at that point, make sure all the wires that you have unplugged are installed in the proper jacks. Also check close for any pins on the jacks that could have gotten accidently bent. Good Luck
Ed
NC Electronic
Mills, Wyoming

Posted on Jan 06, 2008

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And why did you not use the same part #?

Posted on Jan 04, 2008

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1 Answer

What is convergence IC problem


Convergence has to do with how different colors are displayed on a screen or monitor - typically the rear projection and some other types. When colors are overlapping to create unexpected combinations, or leave gaps between areas where overlapping is expected that results in a shifted red, green or blue image strip or edge - that is an indication of a convergence issue. They can look like this in severe cases:

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Colors will drift, so manufacturers often include a utility to help you nudge the colors back in the right place. Most times this utility is buried in the Set Up Menu and when activated, produces a screen like this:

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You will need to adjust the red, green and blue colors for each cross so that only a white cross is displayed. Keep red, green and blue fringing to a minimum. When you're done, the screen should look black and white, symmetrical and straight - like this:

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Problems arise when you are no longer able to coax the utility to give you these crisp, B&W results with no red, blue or green ghosting. This is often due to a failing convergence integrated circuit ("Convergence IC"). Many times, replacing it will solve the problem, but other times it can be the result of failing components either ahead or after this IC. If you're attempting to replace this IC, please make sure the TV or monitor has been *unplugged* for 24 hours or more to allow the dangerously high voltages to dissipate.

Sep 08, 2014 | Hitachi 50VS810 50" Rear Projection HDTV

2 Answers

50H13 Red Convergence Problem


I do wish people like troylove11 would stop giving advice on things they obviously know very little about. The Toshiba projection sets never have loose connections on the convergence IC's, and there are never bad resistors in those sets. There is no separate convergence board and there are no adjustments on any boards. The convergence adjustments are done electronically, through the remote in the service mode. Also, moving or bumping a projection set cannot cause a solder joint to crack loose. Your set has 2 large convergence IC's and one of them has burned out. This is very common in projection sets. Do not attempt to enter the service mode to make adjustments, because you will only be messing up the correct settings and when the new IC is installed, the colors will still be way out of alignment. Replacing a convergence IC is a very simple thing for an experienced tech, and it is well worth getting the set fixed. If your set uses the STK392-010 IC's, it is probably a good idea to go ahead and replace both IC's with the newer, upgraded STK392-150 IC's. If you have not changed the convergence settings, the picture will return to normal once the IC is replaced and very little realignment will be necessary. When I do a housecall for a set like that it takes about an hour and a half and I charge $150, but shops in your area will vary so ask around.

Sep 07, 2007 | Toshiba 50H13 50" Rear Projection...

1 Answer

Picture


This tv have convergence problems,it dead.Red,green,blue misaligns colors,have colors shadows,3d colors pic like.All these problems are the convergence board have 2 STK convergence ICS some or all it resistors are dead.These parts must change to solved convergence problems.The shop will cost u $300-350 for parts and labors.

Jun 07, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

3 Answers

RCA 52 HDTV working fine when suddenly a band of color, red, blue and green appeared at top of screen. Picture curved inward from top and bottom. Picture is blurry and has double images. Television is less...


There could be a convergence problem. Try these:
  1. Press MENU then choose SETUP>AUTO CONVERGENCE.
  2. When Auto Convergence is complete, the Red center convergence menu appears. The cross in the middle of the screen should be yellow. If it is not, use the arrow buttons to move the red cross to overlap the green cross. Press OK when adjustment is complete.
  3. The Blue center convergence menu appears with a cyan cross in the middle of the screen. If it is not, use the arrow buttons to move the blue cross to overlap the green cross. Press OK.

Sep 25, 2009 | RCA HD52W59 HDTV Projection Television

1 Answer

Changing convergence I.C.s in Toshiba 61HX70


the 392-110 used in this set can be replaced with either 392-110 or 392-150----The 150 is a higher current rated IC-------I do a lot of these sets---I would not go to the 160 IC as you may run into problems----also---the 110 should last 3-5 years and the 150 longer---make sure when you change them to check all the protection resistors in front of them and do not forget to put heat sink grease on the new IC's

If this answers your question give me a vote here----I have repaired hundreds of sets with convergence problems---its ok to go up a step or two on the quality of the IC, just don't get carried away---keep it simple

if you need direct help: etower.766@netzero.net

Aug 16, 2009 | Toshiba 61HX70 61" Rear Projection...

1 Answer

I have a Mitsubishi Rear Projection tv (vs-50705). The picture shows a concave image on the top and bottom of screen and the edges go off the screen. I have red blue and green ghost images on the screen...


Well, you did the right first step. However, when the convergence outputs toast up they sometimes cause other problems. First would be the fuses that supply them voltage. These are pico fuses back in the power supply. Second would be open supply resistors that have opened up because of the excessive current draw caused by the whacked out convergence amps. When changing the outputs doesn't solve the problem it takes the repair out of the realm of the do-it-yourselfer. My recommendation is to let a professional take over.

Jun 06, 2009 | Mitsubishi VS-50705 50" Rear Projection...

3 Answers

Red color distortion hitachi 46f500


Can't remember which this one uses but its right on the chips. Check your resistors too.

Apr 08, 2009 | Hitachi 46F510 46" Projection HDTV

3 Answers

Poor colour balance


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.
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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.

Mar 17, 2009 | Hitachi 46F500 46" Rear Projection...

1 Answer

Jvc convergence


1024x768 Normal 0 Convergence

When A REAR PROJECTION TV has coloured outlines or a 3D image the Convergence Circuits most likely need attention.

Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and no more color outlines.

This is the most common fault in all makes of rear projection TVs.

Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design that causes other power supply or vertical deflection problems. The poorly designed products require a "bench" repair that can typically cost from $350 t0 $700.

Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail. The ones that usually allow reliable on-site repair are JVC, Samsung and Hitachi.

It is normal to have some resistors in the circuit burn up or increase in value from the heat (from 2.2 ohms to 5 or 10 ohms). These resistors must be replaced with the right value or the chip may fail again.

This is not a simple repair like changing batteries or a fuse. Reading through the other posts shows many that try and end up with bigger problems.

Your JVC uses STK 392-110 IC's. Misinformed people replace the IC's with other "new and improved" IC's, like STK 392-150. These are devices with different characteristics and require different value resistors in the circuit. Replacing with the STK 392-150 will cause overheating of the resistors and a damaged IC.

If you are in Calgary, I can help. If not, get someone that has experience working on your JVC. My website is below with some costs and explanation.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab

Jun 18, 2008 | JVC AV-56WP74 56" Rear Projection...

2 Answers

Red convergence out of range.


Replace STK393-570 convergence IC. located on center PCB.
re-check alignment........T.

Oct 24, 2007 | Mitsubishi WT-42311 42" Rear Projection...

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