Has anyone out there had any experience with the Mitsubishi LT-52149? (The LT-46149 is identical and uses the same main and power boards, just a smaller panel) I have one that is very intermittent and normal logical troubleshooting steps are not working for me. The set came in with a no sound/no picture problem. After I hit the reset button on the control panel, I got it to come on one time. Snowy screen and loud static in the speakers so I hit the input button to try to switch to an HDMI to quiet it down. It said it was adjusting something and then just shut down. I held the menu and input buttons down for 5 seconds to get the shut down code, and it was 12, normal shut down, no indication of a shorted inverter or panel, and both did seem to be working with the good bright picture. But after that, it would not turn back on again. I tried a different main board from Ebay which acted similar but more erratic. It would turn on, let me autoscan for stations and program fine, but the next time I went to turn it on, it went back into the setup mode like that memory had been lost. And every button on the control panel would make it start autoscanning, including the power button. Other times it would not turn back on at all after just having shut it off a few minutes prior. I also tried a different power board from Ebay which I think may be defective because when it turned on, the screen was pulsating off and on, and the picture didn't seem to have any vertical sync. When I put the original power board back in, it came on solid with no pulsating. Last night it wouldn't turn on at all with the new main board even after a couple rests and unplugging it and plugging it back in. So I put the original main board back in and it turned on right away, let me autoscan to program all the channels, I adjusted the brightness, contrast, backlight, and color for a good picture and it ran good for an hour. So I powered it down, tried to turn it back on 2 minutes later (with both the remote and front panel) and it's totally dead again, no response to the power button. When I press the reset button or unplug it and plug it back in, it goes through the normal bootup routine of the green LED flickering for about a minute then it goes out. But it just won't turn on. I even let it sit all night unplugged and tried it again this morning. Green LED flashes normal for about a minute and stops after I plug it in, but it still won't turn on. At this point, I have no idea if my problem is in the main or power board and if I possibly got defective replacement boards. I suspect the new power board bad for sure with the flickering but not sure about the main board. Also wondering if there is anything else besides the 2 boards that could be causing this symptom? I've never worked on a Mitsubishi before so any advice would be appreciated.
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