Question about Toshiba 55H70 55" Rear Projection Television

2 Answers

Theory of Operation for 55H70? part two

See my original post, plus Techman's helpful first step in the thread "Theory of Operation for 55H70?" This is the convergence screen in 480i mode now. 1080i without an input sig looks the same. 1080i with signal is rock solid.

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  • 6 more comments 
  • Paula Something Jul 23, 2007

    (comment)

  • Paula Something Jul 23, 2007

    (Green gun only)

  • Paula Something Jul 24, 2007

    Been there. Done that. Besides, the initialization after replacing QA02 wouldn't leave it like this I shouldn't think. But, thanks.

  • Paula Something Jul 24, 2007

    A blank. Now that my assumptions are in doubt, is there a specific item in the service menu you would suggest?

    I did note that after the initialization, the settings matched those listed as default in the service manual.

  • Paula Something Jul 29, 2007

    Thanks.

  • Paula Something Aug 04, 2007

    No fix yet. My thanks to Techman for his efforts.
    I am thinking it has to be something in "designer/address mode" that I messed up. I have seen listings of these settings for other models posted but I am reluctant to go shotgunning without specific settings for this Toshiba series.

    My best recollection is that I hit 'TV/Video', then 'Exit' on the remote as I was leaving Service Mode.

  • Paula Something Sep 11, 2007

    Nothing yet. The only info I can add is that it seems to be related to sync lock. If *any* input does not have a signal source, the TV looks like the photos and shuts down.

    I have also noticed that in the service manuals for this and similar chassis, other models have the adjustment procedure for adjusting 'free running horiz osc). The 55H70 does not.

  • Paula Something Dec 04, 2007

    Solved!

    This proved to be a TV way out of convergence as a result of my hitting the wrong buttons in Service Mode.

    To keep the set from shutting down while coaxing the green convergence rectangles back into place, the red and blue yokes were disconnected. Then red-only; blue-only. The process took a couple hours -- just to get a rough convergence.

    Mid way through a final alignment, oscillations began to appear. The grid was still shifted by one rectangle!

    This was a very slow process but in the end the 55H70 is back in working order.

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Was this resolved? Did you end up shotgunning it, or working it out in email with techman, or giving up on it? I'm not sure how much help I can be, if he hasn't been able to help you, but if you need some specific information, I can probably find it for you if it exists on the web.

Posted on Sep 11, 2007

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The service menu needs to be reprogrammed.

Posted on Jul 24, 2007

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  • Larry  Dillon
    Larry Dillon Jul 24, 2007

    Did you get a preprogrammed eeprom, or a blank?

  • Larry  Dillon
    Larry Dillon Jul 24, 2007

    Send me a copy of the service manual, I will look it over.

  • Larry  Dillon
    Larry Dillon Jul 24, 2007

    Oh to techman32k@yahoo.com

  • Larry  Dillon
    Larry Dillon Jul 29, 2007

    I am still looking, I have not given up on you yet.

  • Larry  Dillon
    Larry Dillon Jul 29, 2007

    No problem! :>)

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Sep 02, 2014 | Televison & Video

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on May 10, 2010 | Televison & Video

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Download Toshiba 55H70 Projection Television Manual

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Have you misplaced your Toshiba 55H70 Projection Television Owners Manual?

Would you like a digital, searchable, pdf version of the Toshiba 55H70 Projection Television User Guide?

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I hope that helps.
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on May 10, 2010 | Televison & Video

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You have me one solution but my computer did't reboot. Before I have vista how I do?


Unfortunately you have posted a new thread rather than comment on your original one which means it is very difficult to advise you as I don't know your original problem.(nor will anyone else).

Either post a comment requesting further help in your original post or comment back here with full details of the problem and the steps taken so far to resolve it.

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1 Answer

NO PICTURE, NO VIDEO, HAVE RASTER


you need to repair the connections on the two main power supply capacitors and replace the blown fuse. but make sure if the fuse is bad repair those connections FIRST!!!!!
techman

May 12, 2010 | Toshiba 55H70 55" Rear Projection...

Tip

Toshiba 55H70 Service Manual Download


Download Toshiba 55H70 Projection Television Service Manual

Models: 50HX70 / 55HX70 / 61HX70 / 55H70 / 61H70

8035beb.jpeg



Have you misplaced your Toshiba 55H70 Projection Television Service Manual?

Would you like a digital, searchable, pdf version of the Toshiba 55H70 Projection Television Service Guide?

Follow this link
(& click FREE) to download a pdf version of the Toshiba 55H70 Projection Television troubleshooting & repair instructions.

I hope that helps.
_______________________________________________
Toshiba 55H70 Manual Download

on May 10, 2010 | Toshiba 55H70 55" Rear Projection...

Tip

Toshiba 55H70 Manual Download


Download Toshiba 55H70 Projection Television Manual

Models: 50HX70 / 55HX70 / 61HX70 / 55H70 / 61H70

8035beb.jpeg



Have you misplaced your Toshiba 55H70 Projection Television Owners Manual?

Would you like a digital, searchable, pdf version of the Toshiba 55H70 Projection Television User Guide?

Follow this link (& click FREE) to download a pdf version of the Toshiba 55H70 Projection Television instructions.

I hope that helps.
_______________________________________________
Toshiba 55H70 Service Manual Download

on May 10, 2010 | Toshiba 55H70 55" Rear Projection...

1 Answer

Toshiba 55H70 convergence problem fixed but now vol.is gone


I just posted a question about a convergence problem( juice07 ). I am unable to adjust the red color in the convergence adjustment mode. Did you have a similar problem ?? Please help.

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1 Answer

Sound but no picture


sound to me a power supply problem but this is not my field, techman will help you.....good luck

Aug 08, 2006 | Toshiba 55H70 55" Rear Projection...

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