Question about Toshiba 57HDX82 57" Rear Projection HDTV

5 Answers

Convergence problem unchanged after replacing amps, etc.

I've read most of the material posted here on convergence problems and have done the following:
1) replaced the convergence amps - replaced both STK392-110 with -180s.
2) inspected and checked resistors (inline) - all look ok
3) checked pico-fuses - all ok

Convergence is still bad and doesn't adjust.

Please let me know if you have ideas on what I can do next...

The TV is a Toshiba 57HDX82 Rear Projection. It is 6 years old. I have the schematics, a multimeter, and I'm borrowing an oscilloscope this weekend.

---

History: The TV recently developed the hyper-board disease (video sources were shaky on power-up, then remained shaky, etc.). I had guys from a local shop come out (for $95). They took the big board with them (power and signal) to diagnose the problem. They wanted $300 more to fix it, so I declined and asked them to put it back together. They had a very hard time putting it back together, and the convergence problem began in the middle of this 2 hour struggle. I had the hyper-board repaired (online guy, by mail, $75) and the only problem I have now is convergence. Replaced convergence amps, etc. (see above), and now I'm stuck.

thanks!
Matt

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  • 6 more comments 
  • mhomiller Aug 15, 2008

    The solution posted refers to an RCA set. My problem statement clearly states that I have a Toshiba TV. Also, the $400 figure I mentioned was for the hyper-board repair (I provided this info for history).

  • mhomiller Aug 15, 2008

    The second solution posted is not useful either. It referred to the wrong make of TV - mine is Toshiba. And it linked me to a site selling convergence amps... Please read my post!

  • mhomiller Aug 15, 2008

    Not a solution.

  • mhomiller Aug 15, 2008

    Please don't respond "take it to a tech". Perhaps the experts that log in during the day have a real solution. Thanks...

  • mhomiller Aug 18, 2008

    Thanks for suggesting things to check. Everything checks out ok, but some of the voltages are off a bit... Please let me know if these voltages are a concern, or if there's anything else I can try.

    The 1.8 ohm resistors measure correctly - there are 3 per convergence amp. Solder joints look fine. I measured continuity from all convergence amp pins to another board connection.

    Voltages Measured at Convergence Amp Pins (vs. Schematic):

    Q751 (Vertical)
    [pin3] -31V (-32V)
    [pin 4] -32.3V (-32V)
    [pin 5] 31.8V (32V)
    [pin 8] -21.8V (-20.5V)
    [pin 10] 22.8V (20.8V)
    [pin 12] -16.6V (-16V)
    [pin 17] -21.8V (-20.5V)

    Q752 (Horizontal)
    [pin3] -31V (-32V)

    [pin 4] -32.3V (-32V)

    [pin 5] 31.8V (32V)

    [pin 8] -16.6V (-16V)

    [pin 10] 22.9V (20.8V)

    [pin 12] -16.6V (-16V)

    [pin 17] -16.6V (-16V)

  • mhomiller Aug 18, 2008

    I have a picture showing the set's convergence problem, if that is
    useful. Send an email to mhomiller (at) hotmail (dot) com if you want
    me to send the picture.



    thanks...



  • mhomiller Aug 19, 2008

    More comments posted here: http://www.fixya.com/support/t940928-tos...

    As indicated on the other link, I'll probably consider replacing my new -180s with -110s as a last resort. I'm wondering if my -110s were bad in the first place since the set is unchanged.

  • mhomiller Aug 19, 2008

    Still looking for ideas...

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I would suggest to measure the voltages -32V on pins 3, 4 and +32 on pin 5 as well +20V at pin 10 and -20V at pin 17 on both ICs. Compare all the voltages that you're measuring to the schematic.
Double check the solder joints on the ICs as well and measure continuity from the pins to where they're connecting to other components. Also make sure the 1.8 resistor are measuring the correctly values.

Posted on Aug 15, 2008

  • Jaime Hernandez Aug 20, 2008

    Thank you for the rating.

    Did you find the data sheets for the STK392-180?

    If you have them you can compare all the specs between both ICs.

    Please keep us posted when you replace the STK392-110.

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Better take it to a tech

Posted on Aug 15, 2008

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U shoud go with a professinol service parson

Posted on Aug 15, 2008

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This sit might help u to find the proper STK392-110 and RCA chaedaper chaedaper !!
i geuss the expert got reason!!
the link1

rate me fixe you!!

Posted on Aug 15, 2008

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The convergence is controlled by a separate power supply board and that board needed to be replaced.


take a look at the following web site information. Unfortunately, some RCA sets have manual convergence boards - which means you can do nothing but replace it and adjust the manual controls on the board itself.

But some of the newer ones (Maybe yours) can be accessed through the service mode. So, give it a try. I have also copied the part of the web site that gives the entry code to get into the service mode:

---------

http://myweb.accessus.net/~090/how2adj.html#5.4


5.4 GE / RCA / PROSCAN
Read the _ SERVICE MODE WARNING _ before proceeding.

To enter service mode, push and hold the [Menu] button on the set. While holding, push and release the [Power] button, then the [Vol +] button.

You will now have some information on the screen: "P0 V0"

To actually be able to change these values, you must push [Vol +] on the remote so the information reads V76. Then pushing on the Channel +/- will change the "P" value.

P1 - 3 are error codes. If there is a problem with the set that can be self-diagnosed, the "V" will report the code. These codes are available in the RCA repair manual.

P4 - 7 control the horizontal size, shift, vertical size and shift.

You may also find a summary leaflet for the service tech clipped somewhere inside the chassis. The procedures for getting into the service mode, as well as the service items of interest will be there.

If you're attempting to adjust color or geometry errors, you'll need the Video Essentials DVD, Laser Disc or some other source of test material.

--------

With luck, you MIGHT be able to adjust it back into better alignments.

If you end up needing service, the price of the convergence board - if you can get it from RCA Parts - should not be over $100, but I have not actually checked it lately - and it depends on the model.

The installation is quite time consuming, so it may take a couple of hours for a tech to install and align it.

In my opinion the $400 plus charge is way high. I encourage you to look elsewhere. Also, the RCA web site has a link to authorized service centers; you might try that, also.

Wishing you the best,

Posted on Aug 15, 2008

  • Maanita Chadha
    Maanita Chadha Aug 15, 2008




    Replace the convergence IC and
    check power resistor for leakage, if values are not exact replace
    them. Once the parts are in place perform the alignment

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

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Here is a quick test....

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Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

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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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
77ea520.jpg
f0900cb.jpg
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.


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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.

578ba6c.jpg
TV set after fluid change

65af323.jpg

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

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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.

578ba6c.jpg
TV set after fluid change

65af323.jpg

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  • 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.



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

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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.

578ba6c.jpg
TV set after fluid change

65af323.jpg

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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
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.

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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.


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Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

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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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