Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.
SOURCE: Vizio 42" 1080p HDTV LCD.
This is likely due to heat expansion (turned on) and contraction (turned off).
SOURCE: Monitor wont turn on green light blinks but makes a clicking noise
hi there, light blinks constanly means a shorted electronics parts, most of it are in the horizontal sec., and power supply. check first the power supply if you have a constant voltage output, else your prob . is in the horizontal section. do somr test and check up. ty
SOURCE: Vizio P42HDTV Power on Diagnosis
Please check the U29 8 pin little surface mount mosfet it has this letters > FDS4935 > > In this part inputs 13.2 volts which is ok for the near 12 vdc but it > outputs 1.250 vdc i am 100% sure that this is all the problem > > check it out, and tell me if you´re agree with me > > On this output pin it feeds the audio Ic, the 7809 and the tuner side board > which needs de 12vdc too and its getting only the 5vdc part > > what do ya think?? > > Richard
SOURCE: NEC PX-42VP4G Power supply
Check to be sure that there is no voltage on the input line. You don't indicate what input you are using. Since the set appears to work without an input connected, try looking at the input cable. Also, if the problem is internal to the set, shorting the input jack would cause the same behavior. Please update this with what you find.
Dan
SOURCE: Yamaha DSP-E1000
Check for fuse inside the amp. please take care to unplug amp before opening it.
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