6 red blinking lights

Brand and model would be helpful.

You still have power supply trouble, even after replacement of the board. Recheck the replacement work; could be something wrong there

Likely damage to main power supply-------try to see if there is a specific number of blinks then a pause and repeats like 7 blinks a pause and repeats---that is an error code if there---with it AND THE MODEL NUMBER OF THE TV I might be able or not to help.

Probably defective power supply. Fixya is unable to recommend replacement parts sources.

Hi there,
5 blinks means there is a problem with the video board. It could be as simple as unplugging everything, includding power. Wait 3 minutes then plug power only back in. Or it may be a damaged component that requires replacing.
Hope this helps
TV_Doctors

You have a bad thermal fuse.

Those 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://electro-medical.blogspot.com/
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

The power supply has failed. The best approach is replacing the power supply board-about 390.00

Probably a failing power supply

6 blinks is usually the D board