20 Most Recent Samsung LE26R74BDX 26 in. HD-Ready LCD Television - Page 3 Questions & Answers

Found this on FixYa and it worked:

I had a similar problem and the way to solve this is to reset the set from the remote. Set TV to standby and press Info, menu, mute then power. The set should turn on with the service menu available scroll down until you select reset press right hand arrow next to enter and then enter. TV will turn off. When switched on it goes into Plug and Play mode to reset the analogue and digital tuner. Allow a full reset then you should be ok.
Peter

That is because the tv is in protect mode.
Try unplugging the power cord for ten minutes first.

Set TV to standby and press Info, menu, mute then power. The set should turn on with the service menu available scroll down until you select reset press right hand arrow next to enter and then enter. TV will turn off. When switched on it goes into Plug and Play mode to reset the analogue and digital tuner. Allow a full reset then you should be ok.

I had a similar problem and the way to solve this is to reset the set from the remote.  Set TV to standby and press Info, menu, mute then power.  The set should turn on with the service menu available scroll down until you select reset press right hand arrow next to enter and then enter.  TV will turn off.  When switched on it goes into Plug and Play mode to reset the analogue and digital tuner.  Allow a full reset then you should be ok.
Peter

2590,220184839

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/ Blinking codes details to many popular brand TVs are given. Surf the site with patience. If blinks continue without any pause, the main board is faulty.

you will need to replace the leaky capacitors in the power supply circuit. You can locate the faulty capacitors with a visual check. Those that are bulging need to be replaced.

i need the model,but the problem is in the T-con board.

Most likely the power supply capacitors. you can identify them by their bulging tops.