Picture is very dim - Mitsubishi WD-65733 65" HDTV

Depends on the model. Have you checked the backlight, (LED in this set perhaps).

Yah kindly follow this tip. After loosing the back cover when the tv power cord is removed from power socket, check for bulged or defect power capacitors in both the primary & secondary side of the power pack if found any kindly replace it with the actual or equivalent value as this electrolytic capacitor defects is much common for Samsung power packs

If its a Sony and a DLP a lot of times just before the lamp life ends it gives a darker or dim picture---if it gets dim enough set will shut down.

The led backlights may be failing or the driver circuit isn't working. TV Parts Universal TV Stands DLP Chips ShopJimmy You can get parts and led testers here.

Does it look like a dim black swirling cloud with very faint images?

i have a wd62528 62" dlp hdtv that shows a picture but very dim. I have tried numerous things including factory reset and checking the lamp. I started to get a new lamp but was told if i have a dim picture getting a new lamp will do nothing. However, Mitsubishi support said that if i have a dim picture but was not continuing to get worse or darker, then they were 100% sure i just needed a new lamp. I'm confused. Will a new lamp solve my problem or no. i would just buy and try but it is very costly. please help

Its probably, the bulb going bad. Sometimes they work great then they slowly fade to a dim light.

I figured it out myself. R243 was intermittently open. Replaced it, and now we can watch the Super Bowl.

change ur backlight ccfl lamp

If the picture is dim with no distortion then replace the lamp.Usually when the lamp is used for around 2 years it starts to have dim picture before it stops working or breaks inside.