cracking sound from TX32PL10

PMF

Active Member
Hi, Looking for advice for a friend who own a Panasonic TX32pL10. Around 30 minutes after switching on the set, it gives out a single loud cracking noise, but continues to work fine. Its only a couple of months old. Engineer called out initially couldn't find fault but the noise never occurred whilst he was there. Second engineer blamed it on being connected to a SKY digi box, however friend later disconnected from that and it still did it after around 30 mins of being switched on.
Anybody any ideas, to avoid friend being brushed off by engineers when he reports it again.
I searched the the forum but couldn't find anything on this.
Thanks
 

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