Question about Toshiba 42H81 42" Rear Projection Television

1 Answer

Toshiba 42H81 Hyperboard

Hello Premtech,
I have a Toshiba 42" 42H81 TV and have the hyper board problem. It doesn't seem to affect the component inputs, just the RCA inputs and Coaxial cable inputs. It seems to have gotten progressively worse.This is the 2nd or 3rd time, except this time the warranty has run out. I would appreciate it if you would send me a manual or schematic for this set. I am going to pull the card and repair it myself. My email: tominflorida@juno.com
Thanks a bunch,
Tom

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  • 2 more comments 
  • tomalex Nov 04, 2008

    Bill,
    Thank you for the manual. And the caution. I am doing research on proper soldering techniques. I understand there are 11 caps that will need to be replaced. I am assuming that is all I need to replace.
    Tom


  • tomalex Nov 07, 2008

    Bill,
    I'm looking for a vendor to buy the caps. Based on the manual you sent me, the Toshiba part# for the caps is 24619040. After that it lists the part as: Chip, 10pF, +/-20%, 16V. Notice it says "10pF" (picofarads?), not 10uF. Is this a typo? Or is the 10uF intended to be an upgrade?. I have seen 10uF mentioned on this web site as the caps to order. Could you please clarify? I wanted to make sure before I ordered. Thanks again.
    Tom


  • Anonymous Nov 25, 2008

    I have this same problem (warm up 20 minutes) now I am an electronics assembler, these newer components don't hold a charge like the older through hole capacitors do correct? I will be using smt hot tweezers to remove the capacitors. I noticed you specified 10pf tolerance and voltage but could you tell me the size I might have them at work and not have to order them.



    My second problem is a buzzing/humming coming from the speakers does that have to do with the same problem or is that a completely different issue?



    Thank you for taking the time to help me



    Regards

    Catherine

  • scottgarry Jan 11, 2009

    Could I also get the service manual. I have a guy wanting to charge me 300.00 to do this fix. I am also a CET and can do the work just didn't know what the problem was. I paid him to come tell me what it was, so I need to fix it now

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  • Master
  • 934 Answers

Tom,
I'll send the svc manual directly following this post, but as a word of caution be EXTREMELY careful removing the smd caps. You can easily damage the traces and make the module useless.
Bill

Posted on Nov 04, 2008

  • William Rayburn
    William Rayburn Nov 04, 2008

    That should do it Tom. They're smd cap so once you desolder each pole there will also be a spot of glue to contend with in the center of the cap. Use a tiny jeweler's screw driver to carefully lift each pole while applying heat (if necessary). Don't want to get it too hot and lift the trace as well. Use mini camcorder caps as a replacement, bending and cutting the poles to fit. Place a little spot of solder on each pad of the trace and position the new cap on top. Then just a slight touch of heat on each pole should weld the new cap in place.

    BTW the cap positions you'll be replacing are:

    1. Cx261
    2. Cx270
    3. Cx230
    4. Cx178
    5. Cx221
    6. Cx250
    7. Cx670
    8. Cx241
    9. Cx541
    10. C514
    11. C5030



    Good Luck!

    Bill

  • William Rayburn
    William Rayburn Nov 07, 2008

    Most techs use the mini camcorder caps, for two reasons, and simply bend and cut the leads to fits the board. First they are a more reliable cap and secondly easier to install, especially the two up and near the wall of the module.

    I would order those from Glen at Acme Sales in Florida along with the other bits of stuff you'll need to complete the job. Don't order by part numbers you have in the service manual those are smd caps and I'm fairly sure you don't have a flow station to put them on with...

    Bill



    William Rayburn, CET

    Premium Technologies

    PO Box 442

    Long Beach, WA. 98631

    360-642-4993

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