I have a Toshiba 46G300U1. The front LED lights up but has no audio or picture. The power supply board is a PK101V1380I and has all voltages +5, +12, and +24. The backlight doesn't power on and there is no image on the sceen after I did the flashlight test.
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. Surf the site with patience. 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. ..
Testimonial: "Your link have no past posts for this model. I do my own servicing since 1966, and worked with RCA radios and TVs with vacuum tubes, so all I need was a guide to confirm that the main board could be bad. BTW, how can I test the backlights? They have two signals "Dimmer" and "Inverter" which are always at zero volts. Which one will turn the backlight inverter on?"
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