Joined: 20 Oct 2017
Location: Las Vegas
|Posted: Fri Oct 20, 2017 10:05 am Post subject: Sanyo FVF5044 No Power
Thanks in advance for any assist on this. This TV was given to my parents and they asked if I could fix it. I am no electronics engineer by any means, but I had some vocational classes in high school (mid 80s ha, ha).
The symptoms are no power at all, I don't see any reaction when plugging in and powering on. I have no details on the history, I don't know if it was a gradual problem or sudden.
The TV is a Sanyo Model FVF5044 LED 50" (picture below of model)
The power supply checked out fine. I shorted the standby and power on/off pins and have the correct voltage on every pin (they are labeled on the back of the power supply). Figuring the power supply was fine after this, I mounted it back in, and started to check the main board. When I started checking voltages there, two pins marked 24v were only measuring 12 volts (pictures below)
I started to second guess if I'd measured properly, so I pulled the power supply again, and verified pins from the power supply were in fact measuring 24 volts. So, I mounted the board on to the TV again, didn't plug anything in, and the voltage dropped back to 12 volts. I don't have enough experience to know if this can be normal or not. Everything else on the power supply looks fine as far as that tells anyway. Physically, no visible problems. Once the power supply is grounded to the TV (bolted back in place) the voltage measures 12 volts. Take it off, the voltage measures 24 volts.
TV Model Information:
Where the power supply pins connect to the Main Board Back:
Where the power supply pins connect to the main board front:
Full picture of the main board front:
Where the power supply pins come from the power supply to the main board (back of power supply):
Where the power supply pins come from the power supply to the main board (front of power supply):
Power supply model:
Full picture of the power supply front: