Hi, I have samsung dlp tv m# HLT5687SX. This tv was turning on with a dot spot but at the same time on the screen my tv was giving message no signal.Even though picture ,audio and video signal is there. After changing the dlp chip ,tv comes on with a great picture but, after two or three minutes i get blue message on the screen not available. jut after that message my tv becomes unresponsive with both remote and button.
SOURCE: Metz CRT TV G3478 color problem in PAL mode
I see from your profile that you have not specified your location which make it tricky to be sure which standard you should be using.
SOURCE: Samsung Flat Screen Won't turn On
Replacing the fuse worked for a few days, and then the fuse went out again. I did this 2 times already. The TV repair shop says it might be the "degaussing unit." He may charge me $175 to fix it.
In this bad economy, it may be worth it to fix it than to buy a $1000+ TV.
SOURCE: VIZIO LCD VX20L, intermittant video/audio with Blue screen message "No Signal"
If the tuner is bad, changing the mainboard should fix the problem.
SOURCE: White dots appearing on Samsung TV screen and multipling each day
It seems you might have an issue with the dmd board. Go to the menu, and if the dots still show on the menu, the issue definitely is with the dmd board but if they don't come up on the menu, the issue will be with the video board.
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