Question about Hitachi 43FWX20B 43" Rear Projection Television

1 Answer

Convergence slowly change red moved about 3 inches all over screen

Red drifted to right over a period of days to about 3 inches off alignment,I search the web and found that the fusible resistors might have blown,checked ok,Unit has stk292-110 2 of them and they were hot,I also was shown that a suitable replacement was the stk 292-150,I did install them now I have sound and no picture,the stk heat-sinks are still hot ,so I've stopped at this point for assistance and to find a schematic for this set,
Any help or comments would be appreciated. will the 150 replace the 110's?

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  • fixit r Oct 19, 2007

    hi, I made a typo,stk 392-110. I did sub in the stk392-150 working good so far.



1 Answer

Hey,I am not a pro at this and this is just my story ,It's fixed and running's the story,The problem was the red convergence lines drifted to the right over a period of days,couldn't watch it no more ,pulled the plug!
Search the net and found this site,others here are having about the same convergence problems too,I first went into manual mode and moved the lines around with the remote,no good too far out to bring back,back to this site,found most problems related to convergence belonged to STK 392-110,yep I had them in my hitachi 43fwd20b,I did plug it in and turned it on,those big heatsinks got hot quickly so I figured those are the problem,also I read that several fuses near them could blow,so I checked all of them around the STK's for opens and correct values,they were all good,so I order 2 STK 392-150,I had found another post that said the 150's would work and also the 180's,I used the 150's and they work fine and are running fairly cool,I did add a fan to those heatsinks and also one on the dm board.ok here's how I replaced the STK's ,DO make sure the power cord is unplugged,remove the lower cover ,the black tray that holds the circuit boards slides out,there is only a few screws holding it in,a bracket that has the red wires has to be loosened 2 screws,I removed all the wires from the holders,because they keep the boards from sliding out far enough to tilt them up and release the power board with the STK's there are a few plastic clips that hold the board to the black tray and also wire connectors that are on the next board over to your left lift up to open,they have a small tab on then,I used a flat blade screwdriver to lift them once I had the tabb pressed,once these are free the circuit board will come up out of the tray,I stood the board up vertically and resolder each pin on the STK's,then used a solder sucker to remove solder from each pin,turn the board down,each STK has 2 screws holding them in,remove the screws with a long philips screwdriver so you can reach over the heatsinks in front of them.BE Careful not to slip when doing this,one nick from a screwdriver can damage traces on the board ,once the screws are out you might have to pry them off the heatsink,I did this with a steak knife.The heatsink compound was hard and dried out,I removed it with fingernail polish remover and a rag,when the new parts arrived,I put new heatsink grease on them(i used quicksilver) and reinserted the stk's,do the furtherest one first,be careful to make sure the pins go in the right holes,then the 2 screws do both of them to this point,then turn the board back up and solder each pin to the pads,If your not good at soldering,practice or get someone that can.put it back together.I left the back panel off
and removed the four screws that hold the front on that has the speakers in it.I did this to set up the screens and any other adjustments,I plugged it up and turn it on,connected the cable,got sound with no picture,found the picture tubes didn't light up,bad connection?yep found a connect near the power board it had 2 wires red and a blue that wasn't pushed down,after that I had a picture,now get the manual or go search for how to do a convergence,and follow it step by step and you'll get it done .This took me about 4 hrs,But now I have a much better picture and the convergence is right on! feel free to add on or correct as needed,,,,,Thanks!

Posted on Oct 24, 2007


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i want to learn how to do convergence on my tv its a hitachi rear projection i have problums with colors not aligning,could you lead me in the right direction ps: i don't have the remote so i

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