My light doesn't not come on the circuit board 50a50-241 I have 120volts coming into the board but furnace won't do anything at all. Transformer has power on both sides. I have 24 volts when I check R and W on the board. I think it is a bad board would you agree?

Is there a fuse on the board? If so check it.

No fuse on board

Try jumping R and W on the board. This will eliminate the thermostat or any thermostat wiring problems.

I did that already got 24v nothing came on. Checked all the safety switches.

If you jumped R and W and nothing came on with everything else normal then I would say it would have to be the board. This should be the WR replacement

http://www.white-rodgers.com/wrdhom/pdfs/instruction_sheets/0037-6265.pdf

Also cut sheet

http://www.white-rodgers.com/wrdhom/pdfs/sell_sheets/wr_0541_50A55_843_ss.pdf