Control unit will not respond, the lights are flashing but not responding

Serial communication error. This means that the indoor unit is not communicating with the outdoor unit usually because the outdoor unit is faulty. You can check the indoor unit by switching it to 'fan' mode and seeing if all functions work normally (fan speed, louvers move as directed). If it responds normally, then it's probably ok so you can turn your attention to the outdoor unit. A common problem with the outdoor controllers is that they are susceptible to bugs, geckos, etc. shorting them out which will mean replacement of the board.

My soundbar won't power up. So I pull the battery out of remote, press a few buttons, put the battery back in and all of a sudden the device can be powered up and controlled. Until next time it stops responding. I replaced that original battery with a new one but the problem still persists.

I think you still have warranty, it sounds you have faulty control panel, even if it's new does not mean it is good.

do you have a maytag? just curious
sounds like you have a bad touch panel
if you can not control the keypad and no keys respond, you have a bad keypad

Philips TV model 34PW9815 the LED on the front of the unit turns green when first plugged into electrical outlet, and then immediately starts to flash red. nothing on the unit works and it doesnt respond to controls either on the set or the remote

you have to reconnect it. Click the home button on your remote click connection settings, and hit reconnect. Then press 1 and 2.

Remove the batteries from the controller for a few minutes to reset it then try again.

Check your remote control by using a camera or cellphone camera as your eyes to confirm if the remote control is ok. Point the remote control transmitter to your camera and check if a light emits in your remote control transmitter. If no light then the remote control is defective, but if the light is present then the remote is ok and the unit receiver board itself is defective.

Check also if there is a reset or rst button on the remote control, press the button and test the remote.

Unit probably needs belts. Over time, belts may become slack or decompose into tar-like compound. In this case, the deck will need to be cleaned and belts replaced. Take to pro/tech

http://www.directv.com/learn/pdf/System_Manuals/RCA/RCA_DRD221RD.pdf

See Page 15.

Worked like a charm! Good luck!