Question about Toshiba 43H71 43" Rear Projection Television

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More on signal board jumpers

Thanks for the quick response. So these are wires in parallel with the traces for better current carying? I see an inductor and 4.7k resistor in the +/-16v paths to the STKs, but no jumper wires near the STKs (actual board is back in the set right now). If this is something I need to add, what do the numbers you list mean? Where should thes jumpers be connected - are there specifics posted on another thread somewhere (I tried to search)? Thanks!!!

(By the way - I have just replaced my STK's, but F850 in 16v path continues to blow.)

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  • hobbystuff Aug 24, 2008

    I used genuine Sanyo STKs.

    With the board out of the set again, I was able to identify the jumpers as described (thanks for your patience!). 010 did have a broken solder joint! I then replaced F850 and 852 on the power board and everything comes up - Yea!!!

    I went into the convergence service menu and re-aligned the grid. But at the end, I get "Touch Focus Error". Any thoughts? Picture looks fine. Thanks!



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I will try my best to explain.....hard wires connect two circuit
traces together and are not in parallel with any component.They are used where a component is not needed.....however, the 16v
supplies must travel from the main board where the F850 &F851 fuses are to the signal board where the STK's are....after the two B+ volts pass thru the two PCB edge connectors,typically on an "H" line Toshiba en route to the STK current limiting resistors there are hard wire jumpers with NUMBER locations marked on the PCB.Just " Follow the path the voltages take" & solder all connects.......
Next thought = What brand / quality / price were your new,replacement IC's ?? = Toshiba,Sanyo or.....Chinese junk?

Posted on Aug 22, 2008

  • Vista Electronics Aug 24, 2008

    Touch Focus Error means convergence in servicer mode is not

    adjusted tight enough......if pix looks good to you I wouldn't worry about will not harm set............. T.



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