I hope someone can give me some insight. I just got a Sanyo DP47460 given to me cause they didn't want to try to fix. Well I can't pass up at least trying to fix. Anyway, it will power on and then it will just shut off on its own. Like when I brought it home I plugged it in and it powered up I was messing around with all the menus etc for like a minute or two and it didn't power off. So I turned it off my self and then powered it back on and it worked for like 30 sec. Then shut off. I then powered it back on and it would power on for about 10 seconds then shutoff. Then I tried to power on again and it didn't power on at all. I just unplugged it completely and going to see if it will turn on at all in the mourning. However, I wanted to pick your guys brain and see what everyone thinks I need to replace on this tv. I don't mind putting money into it. I just don't want to replace one part and it not work and then keep replacing more parts. So if you guys can give any insight I greatly appreciate it. Thanks ahead of time. ,Rich
First check the power supply voltages that go to the main board (where the tuner, hdmi and other inputs are located). You will see voltage readings alongside of each wire. You obviously have your 5v stand by, but check the ps-on wire when you push the on/off switch (this voltage turns the rest of the power supply on and gives you the rest of the voltages to run the TV). If this comes up about 3.5 volts and then goes off it means the TV is going into protection mode and shutting off the set. Try using a 1000 ohm resister from the 5v standby to the ps-on wire, If it now stays on or the backlight remains lit you will need a schematic to check the different protection circuits in the set.