My toshiba 36hf72has a broke cord I wired another cord to it but when I plug it in a red light comes on then off what is my problem

One side is power supply the other is 'N' -neutral. Do not reverse

That does not sound good at all.
Support Cobra Electronics Corporation

When the trailer came off and pulled the light cord it stretched or broke wires inside the trailer harness. Start tracing back from the plug, paying careful attention to sharp bends and hold down points as well as connections. Remember that wire could pull apart inside the insulation without breaking it. It might be just as easy to replace the tailer harness. Hope this helps.

Remove battery and power

Remove memory in lower socket, the one on the system board and try reboot with just power cord. May have bad socket

Solved by resoldering some solder joints!!!!!!!
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Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

• Upon turning on set I got flashing red power light and nothing else.
• Removing plug for one minute and plugging in results in:
• Audible click, steady red power light for 2 seconds then slow flashing red light
• Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
• Removing power cord for several hours and plugging back in made no change
• Audible click, steady red for about 2 seconds then slow flashing red light
• Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
• Fuses F850 and F852 found blown

Repairs Made:

• PD0074 DEF/CON Power Board
• There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
• Replaced blown fuses F850 and F852.
• I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
• Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
• Used a fast blow 2 Amp for F852.
• PD0073 SIGNAL Board
• Re-soldered Q751 + Q752 STK392-110 Convergence Amps
• Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10

• Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
• Already owned Service Manual and Circuit diagrams from a different 2004 repair.
• Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
• Some solder. Already owned de-soldering tools, etc.
• Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

Make sure that when you plug the power cord in, a light comes on, on the power cord! If a light dosnt come on, on the power cord, the cord is busted and she needs a new one! Most power cords have lights on them!

Is the fan blocked?
If no air goes in, CPU could overheat.

Try unplugging the 3 convergence yoke plugs and then trying to power on the set. The convergence plugs are located on the board on the left side of the tv looking in from the back and they are 3 identical plugs right next to each other they have a R B and G next to the plugs one letter for each plug just remember which plug goes to which location when you plug them back in.

YUp i have the same prob 2 How can We fix it?

I have the same problem. At first if I wiggled the powere supply cord, and pulled it in one direction, it worked. After a while it wouldn't turn on at all. I ordered another supply cord, but no luck. I opened up the PS2 to see if I could see anything. The male terminal which the power supply plugs into, has three solder joints on the bottom of the terminal. Mine had the main solder joint broke loose. I am going to try resoldering it back on. I will post again if it works. If not will probably just buy another one.