Question about Toshiba 57H81 57" Rear Projection Television

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42h83 hyperboard mvpu14 problem i had the schematic

I paid for the schematic to do this the right way but the hyperboard schematic in no way matches my part the part was directly behind the AV connections and labeled mvpu14 and needed to be desolderd in 4 points to remove it. after i removed it i desoldered 4 tabs to take off the front top shell i just want a diagram to repair this board or and location to buy a new one for a reasonable price. I would prefer to fix mine since I have all the right tools and many free parts available to me. tex64 @ hotmail. com (without the spaces is my email)

if you want a picture of my board and a copy of my schematic let me know but i'm pretty sure its different and i do have experiance reading these from work but I could be wrong 50h52 65h82 is what the manual says and the company sent me something stating its the same

some guidence please

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  • tex64 Mar 02, 2009

    i had the described wavy horizontal picture but the menu's were very clear so i pulled the hyper board assuming this was the problem and started to change the larger smt capacitors i thing i burned part lz35 and i'm assuming it was an inductor after i changing a few caps some of wich tested bad after i pulled them i went to test the board in the tv and the tv red light comes on but seems to almost not power up so i want to test the board I'm much better at testing boards w/ a schematic to follow. I started by changing the 100uf capacitors and not the 10uf caps since i pulled the wrong ones first. lz35 is located in the top left corner of the board if someone other than that I think i changed all the 100uf 6v and 16 v w/ 50v rated caps and would continue w/ the 3r 10 16v caps next and change them w/ a 10uf cap rated at 16v or above



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It is common to use similar or the same board in multiple models. 'Can you describe your problem with the set and what you have done thus far to resolve it.


Posted on Mar 02, 2009

  • ABRsvcs Mar 07, 2009

    Sorry about the delayed response. I did a little research on the initial problem and believe that you may have a power supply problem. Normally when the menu appears OK but standard video has waves it is poor filtering in the power supply. Since the menu is generated directly further down the video processing line, the AC present in the DC power supply lines don't effect it. Look for a bad cap on the 12V or 5V lines.

    Keep me posted.




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