Question about Toshiba TW40H80 40" Rear Projection Television

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Toshiba TW40F80 diode D7702

Your last solution was perfect. However a tiny tag, about the size of a dime, just fell out of the cabnet telling me this is a TW40"F"80. Does your earlier answer still apply. Thank you.

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  • Toshiba Master
  • 8,617 Answers

I will check the specs to that set and post an answer if a few moments

Posted on Jan 26, 2008

  • 1 more comment 
  • Sonny Berry
    Sonny Berry Jan 26, 2008

    No the TW40F80 is a different Chassis that is chassis N5SS

    I will research the specs on that chassis and post that info After I research it.

  • Sonny Berry
    Sonny Berry Jan 26, 2008

    I am still seaching. D7702 is in the +15v pump up circuitry for the convergence output protection. D7701 should be the same , but let me check into it further as D7701 handles the -15v protect crcuit. I will post when I can locate the specs on that diode.

  • Sonny Berry
    Sonny Berry Jan 26, 2008

    I am still seaching. D7702 is in the +15v pump up circuitry for the convergence output protection. D7701 should be the same , but let me check into it further as D7701 handles the -15v protect crcuit. I will post when I can locate the specs on that diode.

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Toshiba TW40F80 with convergence problems


That link is pretty good--most of the chips use low value resistors like the ones in the photos--most in this set are 2.2 ohm--check like checking a fuse.

1.) Some notes for you:
a) go into the customer menu and see if convergence is skewed and will not adjust.
b) if you replace the chips look at all the blue resistors in the photo--info for this model indicated all are 2.2 that you need to worry about.
c) use liquid solder flux before you try to unsolder them and clean the board after with acetone or denatured alcohol--remove all the old white heat sink grease and clean also.
d) apply fresh compound before you install the new chips--you have some choices--the reason the chips fail is the grease dries out but if you want to upgrade a little--use STK-392-150 CHIPS--same part but longer lasting.
e)DO NOT REMOVE 20 PLUGS TO GET AT THEM--GET THE CHASSIS IN THE SERVICE POSITON--yes, you will have to remove a few plugs and let some wires out of places where they are bundled--keep it simple--
f) use a good soldering iron at least 40 watts and do not force or apply too much heat when you un-solder and then re-solder.

The reason you want to use the liquid flux along with a wick is this set uses lead free solder--does not like to be removed--apply it before you solder the new chips in.

If you miss any bad resistors you will have the same problem you have right now--in these sets when they open they usually look perfect.

I have fixed hundreds of sets with this kind of trouble--not hard and much cheaper than having a shop do it--there is good seller on Ebay I buy from--a pair of the 150 chips is about 12 dollars--6 month warranty.

If this info helped you rate this solution as I do this here for free.

If you have questions or need any help let me know--I am here to help people.

SD TECH

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Dec 18, 2009 | Toshiba TW40F80 40" Rear Projection...

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Toshiba tw40f80 cannot adjust green and blue


ok, if you do have a sound problem it is separate from the convergence trouble; this set uses two STK-392-110 ic's. you need to change both and any of the resistors near them that may be gone or open---then adjust the set with the original remote--you can do the adjustments in the customer menu or if needed in the TECH menu-I can tell you how to get into that menu--if you have no sound from the speakers in the set that is a separate issue.

I do this here for free--if you have questions or need help reply here--if this has helped you give me a vote here.

Most of these sets with a convergence problem just need the two chips replaced and the set adjusted---you can buy both chips on Ebay for less than 14 dollars plus shipping.

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