Question about Toshiba 43H70 43" Rear Projection Television
I HAVE A TOSHIBA 43H70 I BOUGHT IN 2001 AND THE RED AND BLUE ARE OFF ON THE RIGHT SIDE. I HAVE TRIED TO USE THE CONVERGENCE BOARD TO STRAIGHTEN BUT MY RED WILLNOT MOVE TOWARD THE BLUE OR GREEN. ON NUMBER 1,3,7 THEY ARE RIGHT BUT ON 2,8 THEY ARE ABOUT HALF WAY AND ON THE 3, 6,9 THEY ARE WAY OFF AND SLANTED DOWNWARD. THEY ARE OFF ABOUT 1/2 INCH. CAN YOU HELP ME DIAGNOSE WHAT IS WRONG WITH MY TV OR IS IT WORTH FIXING. tHANKS RENEE AUSTIN
Hello Renee, You have a convergence problem, but you are adjusting the wrong system. You need to adjust the convergence rings first ok You need a dot and crosshatch generator to properly set convergence for this set. Connect the generator set the TV to channel 3 and turn on the generator set it to dots adjusting the convergence try to get the center dot RGB all together and then adjust for the outer edges using the convergence board. the use the crosshatch to adjust convergence along the lines of the crosshatch pattern. Remember use the rings first and the the convergence board adjustments.
Posted on Sep 24, 2007
I was told I need to replace my convergence output IC'S STK392-110's and also convergence generator. I was wondering where the convergence generator was and how to go about replacing it? Thanks!
Posted on Feb 29, 2008
My Hitachi 43 UWX10B had severe convergence problem making it unwatchable. repaired by technician for $285 made this 5 yr old set work like new!
I lack equipment, tools and skills to diagnose and repair these rear proj HD monitor TVs..so I bit the bullet. hope it will last some 5 yrs or so.
Posted on Nov 24, 2007
I had a convergence prob with a Tosh' 43H70. The Green gun had a bend in the lower left hand side of the screen and red and blue looked bad. Ther are two large convergence driver IC's that control much of the convergence function. Their part # STK392-110 and cost about $14.00 each. You might want to find a geek who is good at removing and re-soldering parts on a typical printed circuit board. These IC's are quite large and are screwed to a set of cooling fins that are also soldered to the PC board.
Start by taking some digital pix of the back of the tv as you take it apart. There are some wire harness connectors that you will have to un-hook so you can pull the main board frame out, work slow and only take off the ones needed to pull out the board frame and flip it over to de-solder the IC's. DON'T try to take out the whole thing, just slide the board frame out enogh to flip it over. Make a drawing or note how many and where these connectors came from it will make it a lot easier to put it back together.
I used a good quality soldering iron and lot of "solder wick" to soak up the solder from the IC's and the heat sink cool fins and they came out pretty easy. There are a few small parts soldered next to these guys so be careful. After you solder wick the pins clean, grasp each pin with a small set of needle nose and move the pin from left to right and up/down to free up any remaining solder. Do the same at the heat sink solder point and the heat sink and IC should come out.
Add a dap of heat sink grease to the back of the new IC and screw it to the cooling fin haet sink and re-align the IC to the holes in the PC board. Have a helper ready to hold the IC in place and re-solder the cooling fins frist and then you can solder in the IC. TAKE YOUR TIME and work carefully.
After soldering the new IC's, re-check for solder "blobs" that may short two pins together. This is a BIG IC and shold be fairly easy to work with. If everything looks clean, re-install the main board frame and hook up all the wire harness connections. Be sure to put ALL the harness wires back into those plastic wire support looms to prevent arcing of the high-voltage CRT cables. (Large Red Wires)
My TV looked like a new unit after I re-converged it. Parts cost $24.00 total. Good luck..... Alex
Posted on Nov 22, 2007
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