Question about Sony Grand WEGA KDF-50WE655 50" Rear Projection HDTV

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Blue vertical lines

I have blue vertical lines that go from top to bottom across the whole width of the tv about 1/4 inch wide. can still see the picture behind it. any idea what would cause this.

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Re: blue vertical lines

Yes...your light engine/optical block is shot... 1500 dollars.

Posted on Jan 25, 2008

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Do yourself a favor and dump this old TV, new ones are much better and cost is very low due to low demand.

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I have a 27 inch panasonic and have about 19 real thin lines across the top of the screen. It is in the top 4 inches of the picture tube.Model CT-2701G Built 9/03

Scan coils (field) measure about 5 to 15 Ohms from the plug where they connect to the main PCB
Look for the cables that come down from the scan coils (deflection yoke) to the main pcb
its either two cables and two plugs or a 4way cable with one plug to the main pcb
2 of the wires goto the vertical(height) and 2 to the width
try to work it out which (the fattest wire is width)
The width ones go towards the loptx(line output/flyback transformer),
and the height ones go to the field output chip (or transistor pair) Follow the printed circuit from the plug and look for a 7 or 9 pin chip on a cooling plate(heat sink for the posh),
it should have a diode connected to it and about 25v on both ends of the diode.

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Red line across top/blue line across bottom of screen

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This is for the original problem.. Not the second post.

It's a problem in the horizontal deflection circuit. The parts will be available, but you will be in for some daignostic repairs also to find out why it failing or if it has failed on it's own.
There should be a few caps near the IC (an LA7840) that could also be causing the problem. Click the link, it will make it easier to locate the part inside.

This is the kind of repair best left to a TV tech, but get it done now and it won't cost anywhere near as much as it will later.

Apr 18, 2008 | Toshiba 42H81 42" Rear Projection...

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Vertical lines problem

On your blue tube there is a crt broad that may have a bad capacitor 4.7uf 250 volts most likely it can be leaky not able to hold correct charge also it might have video ic on same broard breaking down, this will cause your problem unplug crt broad from bottom neck of tube turn set on see if problem goes away if so then it means you have problem with crt broad or it could be your tube.Hope this helps you out!

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1 inch lines on top and bottom of screen

Is the picture overall too small by 1 in. on top and bottom? Or is it cut off by the lines?

If it's too small, look for an adjustment labeled Vertical Height. This may only be accessible internally, it's normally a service adjustment, not a user adjustment.

Your problem is a vertical deflection issue, either an adjustment or the vertical circuit requires repair by a technician. In the latter case, electrolytic capacitors are a likely cause.

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That TV uses the PTK195 chassis, and the fact that you see only a thin line for each color near the bottom of the screen tells me your vertical output IC has stopped working, and is putting a small DC voltage across the yokes. I have seen this caused by a defective vertical output IC and I have also seen vertical problems caused by a small CRT coolant leak which drips onto the main board near the vertical output IC. If you do not have experience servicing the PTK195 chassis than have a qualified tech handle it for you.

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