The tv was working fine except for an occasional popping noise which i also heard in other tv's in the house. all tv's are connected to separate cable boxes. tv was working fine and then the next time i tried to turn it on, nothing happens.
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It sounds like you have taken the steps to isolate the problem to the TV. it seems to be a bad tuner on the Main board. The no signal displayed indicates the TV is otherwise okay. If you have a DVD player or other source you can connect, and you get a picture, then your TV has a bad tuner for sure.
Make sure the speaker wires are not touching at the back of the receiver or at the speakers. Make sue the cable(s) connecting the two is not damaged or shorted. If the wires are ok then the amp/receiver is the problem. Possible bad capicitors are the problem in the amp.
Following up on my Feb 7 post. My new lamp arrived, and I replaced it and it works great. The old lamp had many shards of glass come out of it. It was tore up. I saved some money buy purchasing just the lamp and not the cartridge. It's a little bit more work to take apart, but saves money. Mitsubishi wanted $289 for the lamp replacement kit. I got a lamp for $114. TV is working just fine now!
Yep, same problem with mine. After many trial fixes, I discovered that it's the HDMI connection. I tried two different new HDMI cables in two of HDMI ports on the TV, but still got intermittent sound. The only way I solved it was going to component cables (RGB) with a separate audio cable. Works great now. Other Web sites say that HDMI connections do not always electronically "handshake" well between devices. Not sure how this HDMI problem can be permanently fixed, but using the component connection works fine.
Has anyone heard of something like this where the cable box/service is causing popping sounds?
yes & it is common problem.
And is this something I should be concerned about causing damage to the TV's speakers?
not at all.
The Sony tech-support representative (over the phone) diagnosed it further to a problem not with the TV but with the cable box/service because there were no popping sounds when I played a DVD on my Playstation 2 that is attached to the TV.
they are right that your problem is not due to tv.
it is due to cable box/service?
but not defective it reqires to change the way you have connected tv to cable.please call tech to get it connected in such a way so that you do not get popping sound when you you put off cable box.
HLS4266W 43" dlp. In less than 1 yr whining grew worse, but did know what it was. Year passed with warranty and lamp went out. Replaced lamp. Worked for 3.5 hrs. Turned on next day and did not work. Got another lamp, but did not work. Figured out might be color wheel. Replaced it too. TV started up. Watched that night. Turned on next day, heard loud pop. Lamp never came on. Withdrew and reinstalled lamp a couple times to see if that worked. Did not. Currently, with new lamp and color wheel installed, lamp light blinks, but no lamp comes on. What now?