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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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1cm lighter vertical band on right edge of screen
Hi everyone
I have a problem with my television set. It's a Daewoo 2594ST model using the CP775 chassis. Service manual can be downloaded for free from he http://www.eserviceinfo.com by entering the model or chassis number in the datasheet search field, or I can email the whole manual or just the schematics in PDF format upon request. There's a 1cm vertical band which is lighter than the rest of the screen at the right-hand edge. It tapers slightly as it gets toward the bottom. Also the top-right corner has a couple of columns of pixels not lighting as though corner adjustment is off, and the same towards the middle of this right-hand edge, as though pincushion needs adjusting, although this goes when the overall screen brightness increases and the picture 'breathes'. I thought maybe the corner and pincushion might need adjusting, or since it tapers slightly, maybe even the trapezium adjustment, but I can't do geometry adjustments without a "Remocon" service remote according to the service manual, and I've never seen this lighter band effect when geometry is out before. I have seen something like it when horizontal linearity was over-adjusted on a set, as though the picture was folding over at the edge or horizontal centering was adjusted too far over to one side causing that side to have a siilar effect to this, but all that seems ok - channel logos are in the correct positions. Only one thing in the sci.electronics.repair FAQ sounds slightly similar but the cause (electrolytic decoupling the 205V supply to CRT base amps) isn't the case in this set as substitution today of the 10uF, 250V one with a known good replacement made no difference. Two more caps on the same feed on the CRT base itself are also good. Anyone got any ideas please? Regards, James |
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