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Too dark sony model kv21gmr1

Ihave sony model kv21gmr1 whe i power on picture and sound ok but after a minute the picture goes dark and dark until you cannot see anything but the sound is ok and the osd display is ok i check the supply for abl section supply is good and screen g2 is also good plsssssss can u help me with my problem. thanks a lot

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Warning: The following procedures should be done by an expert.
1.First step is to check the physical condition of the set.Before starting troubleshooting try to resolder the board and find any cold or loss solder.Then after plug the set and see if the filament of the tube glows.If not the trouble is in heater circuit.
2.After seeing the filament if it glows, check the CRT socket and open it.If you can see a sign of terminal decay such as greenish unwanted element on terminal surface,replace the CRT socket.
3.If replacement does remedy the problem check RGB drivers and resolder or replace jungle IC.
4.Try also to adjust the screen adjustment found in the flyback transformer.
5.Another possible cause is the vertical IC.Adjust the screen to full and see if their is a white horizontal line on the screen.If so the problem isin vertical circuit.

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

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