No pix on model # TLX03210B red light on power board flashes. smells burnt but no noticeable burn marks

Any ooze coming from under a cap? The simple fix is to get another mainboard for around $45-65 bucks online from lots of sources.

like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

YOULL NOTICE WHEN YOU SEE A BLACKISH TAN COLOR BURN MARK ON THE COMPONENT OR IT COULD BEVERY WARM WHEN YOU TOUCH IT AND NOT HAVE A BURN MARK ON IT AT ALL

Look at the corrosion man! the transformer is rustier than an old swingset! Replace that junk before ya burn down your house!

The flashing red light means there is a problem that cannot be fixed on it's own. there is a good chance it is shot. You may have to take it in but most likeley it will cost close what replacing it would cost.

If a fuse was blown, it likely would have no power. However if the power board has overheated, the capacitors may have swelled up and burnt out and will only allow it to power on for a few seconds, then shut down. The capacitors can look swelled up or burnt or have burn marks on the power circuit board. You can test them with a continuity meter. Each component has a printed number of it's voltage and ohm resistance so you can test them.

check whether adapter smells like it has been burnt , if it so change theadapter if no i might board problem

There is a burnt capacitor somewhere in the unit. Look for any burnt or swelled up capacitors. You can also usually locate a bad cap if there is burn marks on the system board. Also test power supply with voltmmeter to make sure it is a constant volt reading.

Make sure the brake switch is working. Leave it hooked to the wire harness and work it by hand while someone checks the lights. If the switch works it just needs to be repositioned on the pedal and adjusted. If it doesn't work, check the fuse. If the fuse is burnt or burns out again you have a burnt wire. Start tracing them out one at a time looking for a burn mark. I'd start with the power wire first. It's usually red or orange,it's the most likely problem. Cut out the burnt piece and splice it back together. Tape it up well and look for anything it could rub on to prevent this from re-occuring. This should get you back on the road.

Erratic power supply, at least hope its just that and not a burnt CPU thats keeping it from posting.