Device Selection menu stays on constantly and flickers...

nothing if it is working live with a flickering light

Unplug your device for about 30 minutes to let the circuitry reset itself.
If it works normally after that, it means a hardware part(s) is overheating inside, more likely a power supply is starting to fail and does not provide the proper voltages for the microprocessor.

How long is BlueTooth good for on the source device? There is likely a menu selection on the feeder device.

Scroll circuit board seemed to be replaced,http://www.myksvc.com/camcorder/sony-dsr-pd170-jumpy-menu-scroll-wheel/

COULD BE FAULTY DRL HEAD LIGHT RELAYS OR FAULTY DIMMER SWITCH.SINCE HEADLIGHTS TURN ON AUTOMATIC.TRY USING MANUAL HEAD LIGHT SWITCH ON TURN SIGNAL SWITCH LEVER SEE IF HEADLIGHTS STAY ON IF LIGHTS STAYS ON YOU HAVE FAULTY DRL HEADLIGHT RELAY.IF LIGHTS STILL FLICKER OFF.YOU HAVE BAD DIMMER SWITCH.

You need to replace one STK393-110 and 2 or more 5amp pico fuses. Very common problem.

Unplug the television. Connect the VGA compatible monitor cable from the laptop's VGA monitor Output to the VGA Input on the back panel of the television. You will need a splitter to connect the audio cable from your laptop to the VGA Audio Input on the television. Never mind if you have speakers connected to your computer.

Press the Device button on the remote control or on the television front panel to display the Device Selection Menu. Select the device you want to view, in this case VGA. The only compatible resolution is 640X480 at a sync rate of 60 Hz.

Do not leave stationary or letter-box images on-screen for extended period of time to avoid uneven picture tube aging.

23 is a horizontal deflection error could be ho transistor flyback or high voltage splitter

enter to bios set up then disable the f1 and f2

I had a similar problem: my WS-55511 would not respond to the remote and the front control buttons (with the exception of Power) cycled through the Device Menu. I solved this problem by disconnecting the front panel. Here's how to do it: 0. Unplug the TV
1. Remove the speaker grill from the front by pulling forward: there are no screws. 2. Disconnect the two cables that are exposed after the grill is removed. 3. Plug the TV back in, wait for 5 minutes to reset. 4. Try using the remote.  Hope this helps!