Prima LC-32R25

Feb 18, 2009 1 Replies
V

Morning guys:



I just picked up a Prima LC-32R25 LCD TV (garage sale). The past owner said the unit had no picture or sound. After pluggin it in, I notice that the back-light comes on, but no video or sound.



I've disassembled the unit and have checked the SMPS and all of the secondary regulators on all the boards.They are all where they should be, with little or no ripple.The only control that works is the "power" button.



Anyone have a schematic, or insight on what to check now? I've been a tech for 25 years but this is my first look at an LCD display!



Thanks,



Tedd, ve3tjd


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M

Look for high ESR capacitors or shorted rectifiers in the smps power supply. Probably not much else you can do. If you should find a shorted rectifier, be sure to use a fast recovery type suitable for switchers. These will usually show a lower forward resistance on a DMM diode-check function.

Mark Z.

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