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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
I have purchased 2 remote controlled toy cars from Costco over the years. These New Bright batteris and charges last only a few charges, and then they go bad. I am disappointed. I will go to Walmart and buy a new battery and see if it works better, if not, i will return to Walmart.
I have one with no backlight. The capacitors on the board are bulging. In my opinion they were designed too close to tolerance and "cooked out". As long as it's still working change the ones in the Regulator circuit(3 in the middle of the heatsink area), and the four really small ones over by the transformers. Should be right as rain.