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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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#1
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Panasonic CT27S18S - No picture, sound OK
TV Started few months ago with extra ghosting hor.line on top 10% of
screen. Then losses screen. Resoldered most joint, replaced LA7838 vert IC. TV back to condition before with a couple of horizontal line on top of screen. 2 days later returned to no screen with sound/ channel ok. How do I fix the root cause - the extra horizontal line appears on top section of screen? OR could it be something else? Thank you! |
#2
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Panasonic CT27S18S - No picture, sound OK
Try to tweak the G2 pot : you will see a fine and bright line across
the screen. Turn off the set, and turn down G2 pot. You have a fault in the vertical deflection! |
#3
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Panasonic CT27S18S - No picture, sound OK
The fault was never repaired. ESR or jump out the vertical circuit
capacitors. As the new ic has completely failed by now, you also need to replace the vertical output ic and probably a fusible resistor. |
#4
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Panasonic CT27S18S - No picture, sound OK
Change these caps and the IC again ( My notes show that IC is a LA7836 NOT a
7838) C451 220/16v C455 100/35v ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ======================== "TGK" wrote in message lkaboutelectronicequipment.com... TV Started few months ago with extra ghosting hor.line on top 10% of screen. Then losses screen. Resoldered most joint, replaced LA7838 vert IC. TV back to condition before with a couple of horizontal line on top of screen. 2 days later returned to no screen with sound/ channel ok. How do I fix the root cause - the extra horizontal line appears on top section of screen? OR could it be something else? Thank you! |
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