I replaced my dryer cord in our Lg dryer and now there is no heat

you can buy a new block and you don't have to replace the whole harness if the wire just burnt at the block,you can cut it,put on another wire connector and reconnect it to the block with the cord,make sure when you're done all the nuts and connectors are tight so this doesn't happen again and use the metal cord bracket,if it's not on your cord buy one,it holds the cord in place so when the dryer moves it holds the cord in place,if you don't use it the cord could cut on the metal frame and the wire connectors on the block will come loose from the cord moving or vibrating with the dryer running

Have you checked your circuit breakers to make sure they have tripped??
Look at the junction box behind the dryer where the power cord connects to the electrical system of the dryer. Open the panel and make sure that the connection is clean and tight. If it has any burn marks, you will need to replace the whole wire harness under LG's repair policy.
If these problems are eliminated, then you may have a problem inside the heating element or it's high limit switch which is inside the dryer and require disassembly.
Hope this helps.

There are several things that can prevent a dryer from not heating. UNPLUG DRYER BEFORE TESTING ANYTHING.
1- power- Test the receptical to make sure you are getting 220 volts. To do this you need and voltage tester. Both legs should pull 110 and together 220. If one leg is not pulling any power than your breaker is half tripped. Reset breaker to cure your problem. If problem persist it is in the breaker or receptical.
2- cord- To test this unplug dryer. Take the panel covering the cord connections off. Remove cord entirely from dryer. Test each leg for continuity. If any are not showing cont than replace cord.
3- Themal fuse- To test this remove access back access panel on some front panel. By the blower housing there is a fuse white thin sliver or round fuse with 2 wires going to it. The one with 4 wires is your low limit cycling thermistat. The thermal fuse is near that. Disconnect the 2 wires and check fuse for continuity. If meter shows cont fuse it good. If not replace fuse.
4- Hi Limit Thermistat- test same way as thermal fuse. On the heating element housing at the bottom are 3 wires running to a fuse. Test the left and right. The bottom is attached to one of the sides.
5- Thermal Cutoff- Test same way as thermal fuse. This fuse is near the top of the heating elemnt above the Hi Limit. 2 wires with usually plastic covers on them.
6- Heating Element- Below high limit 2 wires. Test for continuity.
If all these fuses are good than you may need to call a technician. The motor may not be getting to the right rpm to activate the senfrigrial switch in the moter. Timer or control board may be out.
7- Motor- If

Several things can be the problem.
Is 220v present @ the outlet?
Heat element?
High limit thermostat?
Main computer?
Bad dryer cord? Ect...

Proabably time for a service call.

If you move the cord @ the outlet and the dryer shuts off replace outlet if the prongs on the cord are not damaged.

If you wiggle at the dryer side and it shuts off un plug the dryer remove acess cover and inspect end of cord. Ck. and make sure terminal nuts are tight. and not burnt due to a loose connection.

Most likely cause is a miswire of the house 240V outlet if the dryer cord was installed properaly.

Your circuit breaker may be bad. Run dryer and if breaker gets hot after 10min or so the breaker is bad.
Higher heat settings draw more amperage thus tripping the bad or undersized breaker. 30 amp 2 pole breaker required.
Ck. the power cord for signs of arching. Replace power cord or outlet if damaged.

The following link explains how to properly wire a three or four prong 220VAC appliance:

http://www.fixya.com/support/r793520-3_prong_4_prong_power_cord_conversion

Read through the link provided, and make sure you have the power cord wired correctly at the terminal block in the back of the dryer. NOTE: If this is a new installation, you are required to be using a four-prong outlet with 4-prong power cord. If you have any questions, please let me know. I hope this helps solve your problem.

Download the user manual. http://www.retrevo.com/support/LG-DLE5977-Dryers-manual/id/438ag222/t/2/

Most likely you have a bad electrical connection, resulting in only 120 volts to dryer. (enough to run the 120 volt motor, but not enough to power the 240 volt heating elements) Turn off breaker. Make sure wires on breaker are tight. Make sure nutral wire is tight in breaker box. Take cover off dryer recepticle and check the wires in it to make sure they are all tight. Check that the connections of the cord at the dryer are tight.