My hannspree tv wont turn on i hav tryd switchin it off at mains

To program a Hannspree remote to a Hannspree TV, first turn on the TV and then press and hold the "Code" button on the remote until the LED light turns on.

Next, enter the four-digit code for the TV using the number keys on the remote. If the TV turns off, press the "Code" button to save the code. If it doesn't turn off, try another code until you find one that works.

If you cannot find the four-digit code for your Hannspree TV, you can try using the code search feature on the remote. To do this, follow the steps for programming the remote but instead of entering a code, press and release the "Code" button and then press the "Power" button repeatedly until the TV turns off. Then, press the "Code" button to save the code.

If you are having trouble programming the remote, make sure you are aiming the remote directly at the TV and that you are not too far away. Also, check that the batteries in the remote are fresh and properly installed.

If you accidentally program the remote to the wrong TV or if you want to program it to a different TV, you can reset the remote to its default settings by pressing and holding the "Code" button for at least three seconds until the LED light turns off. This will erase any previously programmed codes.

HI, I'm not familiar with this brand set but in most cases, you can't replace a main board from another size set and have it work. I'd get the right board and see if that fixes it. I'd say the power supply voltages are ok, anything within 10% of rated should be ok, but the voltage to the tcon doesn't sound right, again a main board issue.

Remove power for about 30 seconds and try again.

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Check the power suply caps and backlight inverter for shorts, please read below to understand how the LCD TV works.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

You need to check the power supply module output voltages fist.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Your power supply module may have gone out.
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

You should ensure that 1) the monitor is plugged in, 2) it is set to the proper input (VGA, HDMI, etc), and 3) the monitor power light is green instead of orange.

Good Luck,

NOLA Tech

check for a shorted bridge rectifier or diodes in the main power supply