No picture/ chirping noise

If it is a belt noise, sprinkling baby powder on the belt will make the noise go away. Apply liberaly with engine off onto the belt and start the vehicle. The belt may have gotten coolant on it and this will cause the chirp. Also a defective belt tensioner will cause the belt to chirp

Either the battery is dead or you need to change the sound setting that keeps unit off when it does not detect sound to protect the battery.
Another person said.
".We have this one. It must be in the sound activation mode, which helps to save the monitor's battery life. If it's in that mode, you'll see what looks like a crying baby icon along the top of the screen and the screen only turns on when sound is detected in the room.

To turn the mode off and keep the monitor on all the time, just press the Menu button on the right (in the middle of the arrows), press the right arrow until you reach the crying baby icon on the far right (so the icon gets big), press the Menu button, and a check mark and an X will appear - the X will be pre-selected and appear red. Just press the Menu button again to select the X and turn that mode off. Once back to the Menu screen, arrow up to the Return button on top right and press the Menu button to exit."
First years talk and soothe video monitor help

It sound like its fly-back transformer side circuit fault. This is not a user repairable fault. Contact any service technician.

sounds like the Main Elec on the PSU is bad and needs changing

The convergence is dead.It cause 3D colors misalign
and clicking chirping noise with no power on.Know how how to solders?The 2 Convergence ICS must change and all it resistors. Tries Tv Repair World.com,Tvrepairkits.com for the convergence kit to repair it ur self.The shop will cost $300 for parts and labors.

Is the FBT,the high voltage transformer.The big black block of plastic with a red wire solder to a board.MIght even have to change transistors deflection board also.

Components in Power supply are bad most likely a 35v 100ufd capacitor if not then your Flyback transformer is bad

No sounds like the blue CRTs coolant has congealed and thats whats giving you the trouble. the blue tube get congealed and will cause the blue to not even show up properly in the convergence menu

power supply discharging.even after the set is unpluged.

Rich that chirpin noise is somthing over loding it try checking your horzotal output for short and diodes around the transformer...