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Re: blue and pink dots displayed on screen
Looks like the display has developed some problem. Try changing the input device to some other like a DVD player, VCR etc. If the problem persists, this might require attention by a qualified service technician.
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Is this from the tuner, or using HDMI/composite inputs? If it's HDMI/composite inputs, unplug and replug the cables at both ends. It could just be dust/corrosion on a connector. If it's from the tuner, connect another source through one of the input cables and see what happens.
It's also possible someone sat on the remote, or otherwise changed the settings by accident, or playing a trick on you. Go into the video menu and check the color and tone settings.
Before you replace any parts, try a few experiments. Have you tried using the video input rather than the tuner? The menus are generated internally and enter the video stream later on in the processing than either the tuner or video input. Please try one or more of the video inputs and report the results here. If the video inputs work, the problem is the tuner. If neither work, then the video processing section is defective and will need further troubleshooting.
The HDTV tuner is out. Analog tuner, and video inputs work fine.
TV Model P50HDTV10A Screen Size 50 in. TV Manufactured Date Jan 1, 2007
Part Type MAIN UNIT Alternate Part Type SIGNAL BOARD Part Number 3850-0042-0150(3A) Alternate Part Number 0171-2272-2163
This is possibly a problem with the low voltage power supply, or it could be a problem with the tuner. To test this out. What I need for you to do is to disconnect the cable from you cable TV set top box to the RF connector of your TV. Then I want you to connect either your composite or component video cables from the set top box to the TV and using the remote switch the input from the RF (tuner) to the composite input and note if this removes those lines. The select the component video input from the menu and note if this gets rid of those lines.
If the lines disappear for the composite and component video input test. Then the problem is in the tuner, if the lines remain then the problem is in the power supply or there is a video problem.
In either case after the test I would suggest that you have a qualified TV technician troubleshoot the TV and repair the problem. At least you will have input to tell the technician on whether the problem is in the tuner or the power supply/video section.