Re: Samsung LCD TV: no picture/sound, red light blinks, white light on, ignores on/of

I did some voltage measurements on the pins and found:

* pin Power On/Of pin = 4.2V -- interpretation: power board powered on, also explains white light at the bottom-center of the screen is on; merely connecting main power cable gets TV in this state, can't power off (to get pin voltage near 0) using power button, power off commands seem to simply be ignored
* pin Inverter On/Off = 0.03V -- interpretation: main board not sending inverter-on signal to power board, hence no backlight...

My Samsung LCD TV (LN40A550-P3F-XZC) stopped working :-( I hope someone can help? Symptoms: the red standby light blinks all the time, and the white light at the bottom-center of the screen is on, but there is absolutely no image (not even in a pitch dark room) and also no sound. The voltage on the STB 5.3 pin measures 5.1V and the voltage on the PWR On/Off pin measures 4.33V. The strange thing is that I can't turn the TV off either: as soon as I just merely connect the power cord, the situation will become as described above: white light at the bottom-center of the screen is on, red standby light...