Blue LED light comes on but nothing else happens when turned on

Check the power source?Replaced the power supply board it dead.

It sounds like it is the picture tube. The same thing just happened to me. The back of my television started smoking and then there was no picture.

You need a main module----Part #909-kso-gf321xa Encompass Parts.com
List price is $462.00
Craig----Hi-Tec Electronics

Try to read your product manual caferfully all information are cited in the manual in order to have a smooth operation of your unit.

Hi there!

I work in an electronics store and I've come across this problem before. The only solution that has ever worked for the people who call in or come to see us is pretty simple. You need to unplug your PC from the TV (if you haven't already done so), turn the TV on by using the "channel +" button. Some TV's when turned off at the wall will not turn back on again unless you press the channel + button. Give it a go and see what happens. Let me know if you need more help.

Also, it sounds like your laptop may not have been supported due to the wrong resolution being outputted through your VGA connection. When you get your TV turned on again I'll see if I can help you get them to work together,

Cheers and good luck!

Abby.

Try pressing the "channel +" button on your TV.

Usually TV's have that period of time where they'll turn off after an hour or two of no one pressing  a button. If the problem persists, You could get another one and return the old one with the new one's receipt. 

The problem is with your "control box". I just went through this also. You didn't say how old your TV was. My TV was 1 year, 3 months, 26 days old when my control box went out. I finally got the number to Polaroid and called until I got help. (don't expect any help with their call center) They sent me a new control box and the TV works fine now and the box has a 90 day warranty. Unfortunately, if your TV is older than mine was, its unlikely they will help you. You can watch ebay for a unit, they come up regularly. You will need to know which one is the model version for your TV. Look at your serial number, the 4th and 5th characters tell you which version. If your model version is 00, 01, 02, 03, A1, 23 then the unit is: *909-KS0-GF371XAH. If it is 12, 13, A2 then the unit is: *909-TE1-GF378XCH. This info on the serial #/model version was given to me be a repair tech that had a control box for sale on ebay. I have not verified the information, nor did I have to use it, but it sounds accurate and he seemed knowledgeable. I hope this helps, good luck.

Go here for your fix http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_tv_black_screen. It was originally posted by Stiv0, but you will see my reply down about 10 entries or so. Read both his and mine before you get to work on it.