Philips lcd 42PFL5522D Backlight Clicking ?

[buncey]

morning everyone.

i have a philips 42PFL5522D in workshop.

set suffers from a weired problem when you first switch the tv on you can hear a type of clicking noise for about 2 mins.

also when you switch the tv off you can hear the clicking noise again for about 2 mins?


checked power board the clicking is not comming from psu but seems to be comming from i think the backlights as the sound is comming from middle of set behind metal cover. the sound is quite loud which i can only describe as its like somethink is clicking on the metal chassis.

i have noticed this problem on 2 identical model sets.

anyone have any ideas or come across this problem before on this chassis?

thanks

[chrissie jones]

i had one of thease sets.i gave up on it and put it one side.if you have any luck let me know.

[sparky]

hi
do you think it might be arcing,can you smell any tcp type
smell,check the connecters to the ccfl tubes for burning
dave

[buncey]

hi dave no its not a arcing sound its like a metal clicking sound when you first switch on from cold and also does it when you switch the tv off ?.

i have attached a sound clip i recorded of the sound as might help. ( might need to turn your sound up as was recorded off my phone)

[chrissie jones]

thats a strange one.perhaps its a poltergeist.

[davenjax]

could samsung be using morse code now to identify a fault lol .seriously though strange one

[buncey]

its as if the blacklights are hitting off the metal?

i have had another exact model which had same problem which i stripped.

surely someone must have come across this before?

[sparky]

hi
it sounds like arcing switch all lights so its jet black
and see if you can see it tracking over when you
switch on
dave

[buncey]

no arcing sparky?

sound like the backlights are expanding  when warm and also expanding cooling down. causeing this strange sound?

i have never heard of this fault through?