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the picture getting darker means the lamp has aged and u need to replace it another thing u need ti replace the mirrors in the light tunnel of the light engine they have faded secondly the noise means the colour wheel has aged you need to replace it u will have to replace the whole light engine cos the color wheel comes inbuilt the light engine and u will be ok ontact lg dealer in your area
remove all the electrical wire connections from the back of the tv .remove the power plug from the electrical outlet and wait for two minutes and replug the wire and then ckeck.it should work.
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This is the Famous 3 strikes and out for RCA's--it tries to come on 3 times and if fails shutdown occurs.
The high pitched sound may be a short or could be something arcing--if the sound comes from near the very front of set--could be the HV splitter this set has arcing.
chirping sound is a short of some kind, could be the flyack or horizontal output, could also be a bad picture tube or power supply capacitors, you really need a tv repairman to troubleshoot this.
TV tries to come on - yellow light next to power light flashes but then it turn itslef off.........It tries agin after few sceonds and sequence repeats. I can hear the sound but no video
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