Hitachi 50"comes for about 10 seconds then cuts off.

If you have a flashing red light, try this first: The flashing red light is, according to the Hitachi service manual, an indication of exactly one problem. It is that the fan (internal, blows air over the power supply heat sinks) has failed. In my case, it failed by continuing to spin (very confusing), but put out a signal (3V on the white wire of the fan harness) that it has failed (I had to look up the data sheet on the fan to figure this out). A new fan from Arrow $10 fixed the problem. If you suspect your fan, spinning or not, you can safely short the white to the black wire to see if your TV remains on after being turned on (solid red light), and then try turning your TV on (blue light) to see if it works.

Yes,ur tv need a new lamp.The lamp last only about 1 1/2 or 2 max,if the tv in used like 4 or 5 hours of watching the tv a day.

lamp door has to be closed

first step to take:
refer to the user's manual to find: How to replace the lamp?
and second replace the lamp. www.andrewselectronics.com. prefer original ones.

Sadly to the end I can now explain the "problem" of my question by myself ...
Because I'm was not sure if I can handle the "problem" by myself I gave the Screen to a technican at our City with all the Information I found until this point (By the way my suspicion was the defect of something at the power supply unit). Two days later he gave me a call with the information about the error: An error at the power supply unit - spare parts => 50€, Work => 200€).
Unhappily im not yet got at soldering on screens, but for 250€ i would have made a good course for this (and if I can establish i will learn it).

So now again a bit more objectively:
Error / Problem:
TV - Step 1: Power Off
TV - Step 2: Stand-By
TV - Step 3: Power-On
TV - Step 4: Short flashing picture
TV - Step 5: Reverse to Step 1

Solution:
1. Find the defect Fuse/Safe/...
2. Buy the Spare part at eshop2.euras.com
3. Change the parts -> et voilá

Hopefully I could have been a little help for someone.
With kind regards,
NatureOneFreak

my hitachi model number:55fx48b suddenly just stopped. I can unplug the tv, then turn it back on and red led light will come on for 2 seconds and shuts back off! Can you please help me

Ditto for Jan 13th with a Panasonic 50"!

Hey king901, must be a Hitachi gremlin. I have the same problem on the same day - how weird!!! My red light flickers for a second and then goes out. I wonder if it is a power supply problem??? If you find out can you email me at [email protected]. Thanks. BTW, my set is about 8 years old.

the flashing light often shows malfunction ,check the wire connection of your devices something must be wrong .the surge protector you have is for overpower or low voltage too?Ask your neigbours if they have shame problems

You can download a PDF from here: http://www.servicemanuals.net/results.aspx?type=SM&brand=0&model=50EX20B Make sure that the coolant is not leaking out onto the printed circuit boards. i have had the remote sensor cause this problem before and also I have had bad capacitors in the sweep and the main power supplies. Good Luck