Replaced bulb about about 3 months ago with an original bulb and now tv went back out and front lights indicate a bulb problem. I have taken out the bulb and didn't see any broken glass. Does anyone know how to physically tell if the bulb is bad or if it may be the ballast?
It is a common practice that the ballast to repalce along with new bulb. There is no way to check the internal winding short of ballast. Repalce both at the same time. If ballast has any damage, it will surely ruin the bulb too.
SOURCE: i updated my lcd samsung firm ware and the picture went crazy .
you need to go into the service menu and adjjust the option bytes. When you upgraged you changed them. The other solution would be to replace the main pcb
SOURCE: TV turns off by itself
Check the interlock switch on the rear lamp cover. Sounds like the cover might not be seating completely, allowing this safety switch to shut the TV off. When you remove the cover, it's just to the left of the big black plastic ventilation guide for the lamp, and it's a little tiny blue lever that moves up and down. Make sure the wires going to this switch are OK (not pulled out or 'hanging by a thread').
SOURCE: LE40R74BD VOLUME OK BUT BLANK SCREEN
sounds like the backlight is out, can you see a picture when shining a flashlight on the screen. if yes you have either a bad inverter power supply or bad screen (panel).
both are serious , also could be just a few bad capacitors on the power supply, if you want you can do a visual of the power board caps will appear swolled on top and are easy to solder in cost about $1 EACH
I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771
SOURCE: my samsung 50
The only thing that will cause the lamp to fail that fast is the ballast. The ballast is part number BP47-0037A and I am including a link so you can purchase the ballast. Please take a few moments to rate my answer. Thank you..
http://www.partstore.com/Part/Samsung/Samsung/BP4700037A/New.aspx
SOURCE: I have a Samsung HLT5075s. Last Sunday the Tv
Not the light engine. But it could be the power supply. I've seen a few than pass "dirt" power to the ballast and damage it. Have a peek at the ballast, there's a big 47uf, 450v capacitor on it. If it is swollen, it's a dead give away. You need both. I hope this was helpful.
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