Question about Toshiba 61H71 61" Rear Projection Television

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Red covergence The red convergence won't move vertically....image has sharp red shift outward from center and extreme at edges, especially right edge.

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  • Anonymous Nov 16, 2007

    My red covergence will not move horizontal but will move vertical when i try to align with the blue

    & green cross hairs in th covergence mode.When all three color are covergaged together the cross hairs should turn white meaning in focus.

    Could someone please help!

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Http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Posted on Dec 05, 2007

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1 Answer

Words are doubled red borders???


Just to clarify, it sounds like what you are saying is that the image appears to duplicate in either red or blue along the edges of the image (especially white lettering and probably increasing along the boarder of the TV). This is resolved by converging your TV. Convergence will drift normally on large screen projection TV's over time or through moving them. The Hitachi 57f500a has a feature called "Magic Focus" (pg 36 in your manual) which will auto converge the image. If the auto converge feature doesn't work, on page 37 in your manual, it explains how to converge manually. If you do not have the manual, I have the image of the pages below. If for some reason this doesn't work, please provide additional info and detailed prior to rating the help.

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1 Answer

Image problem


IF I understand the problem from the limited info in your question, the problem is a distorted picture on whatever surface [probably a wall, or screen] onto which the image is projected.

With all lenses, the axis [centerline of the lens projected] MUST be absolutely PERPENDICULAR [in both the vertical and horizontal planes] to the perfectly plane [flat] surface onto which the image is projected.

IF for example, the projector is mounted in a rear corner of the room, and the camera is aimed downward and to one side to project the image on the center of the opposite wall, or a screen located there, the image will be distorted. It will be larger on one edge [fartherist from the lens] and smaller on the opposite [nearest] edge.

If it is non-perpendicular in only one axis, then two opposite edges will be different lengths, and if out of perpendicular in two axis then no edges will be the same length.

The solution to this problem is that the center axis of the lens must be perpendicular to the surface projected on, in both vertical and horizontal axis.

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RGB on Barco Reality Sim 6 diverge at edges...


Should be possible to adjust the convergence having a projector this quality! Call Barco in Belgium and ask them!

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1 Answer

KP-46WT510 - Red has shifted away from blue and green.


hi,
first replace the 2 convergence chips they are the big ones with heat sink atached,they start with stk letters and like six numbers,change'em with same ones you can buy'em at www.pacificsemi.com for cheap and original parts,friendly people,ok and that should fix problem,you won't need service manual,or you can get that too at www.asm-service-manual.com for cheap too,ok,let me know how was evething,your friend,faradio.

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1 Answer

Double image - not covergence


http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

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1 Answer

Red & Green seem "off centered"


Your set uses the 195 series chassis, which has separate components for each of the 6 convergence channels and a separate power supply for the convergence circuits. If all 3 colors have drastically shifted, especially around the edges, then chances are your convergence power supply has stopped working. This is usually caused by the failure of the STK730-010 switching IC. If one of the colors has dramatically shifted by itself then something has stopped working on the convergence board. Sometimes I see CRT coolant leaking onto the convergence board as the cause. In either case this is something that should be repaired and realigned by someone experienced with RCA projection TV convergence circuits.

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2 Answers

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Covergence is off... Check convergence and see which color will not move in the convergence settings... That is the STK that needs to be changed out...

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1 Answer

Yellow vertical bar on right edge of screen


Your set is starting to get a convergence problem and the only way to repair it is by changing the convergence IC's,(3)one for each color,the blue migh be showing more now but soon all 3 colors will be out of alignment and you will not be able to correct it with the custumer controls,is great that it has worked for so long without this problem,if you are familiar with tv service you have a place to check but if you are not too familiar be safe and call for help from a pro-servicer.Let Us know how it goes.

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