Recently picked up this Vizio M3D550SR for free and figured I'd have a go at trying to get it working. The problem is, this TV has me a little confused. The Vizio light on the front is on, the TV output's sound and when a flashlight is held to the screen, you can see that the lcd is working, but for some reason the LED's aren't turning on.
So I starting checking voltage's going from the power supply to the LED driver board, these are the voltages I got:
24v-23.6v
24v-23.6v
24v-23.6v
24v-23.6v
24v-23.6v
GND
GND
GND
GND
GND
on/off-3.2v
DIM-no voltage
All of those readings seem to be within the range shown on the power supply. So I checked the voltage going from the power supply to the mainboard, this is what I got:
on/off-3.2v
DIM-no voltage
12v-11.7v
12v-11.7v
GND
GND
GND
24v-23.3v
24v-23.3v
PS-ON-1.7v
5v-5v
5v-5v
GND
Again all those seem to be near the range shown on the power supply. Since the power supply is putting out the correct voltage for both the LED driver and the mainboard, I'm guessing I can rule that out? And since the mainboard is putting out sound and a faint picture, is it possible I can rule that out as well?
Another set of voltages I tested were those coming out of the LED driver. The LED driver was showing voltage going out, but since there is nothing printed on the board, I don't have a reference for what these voltages should be. I can post the voltages I got out of it if someone here knows what the voltage coming out of the LED driver is suppose to be.
Sorry about the long post, just wanted to be thorough. Any help on this would be appreciated.
Forgot to add, those voltages are with the TV on.
So I starting checking voltage's going from the power supply to the LED driver board, these are the voltages I got:
24v-23.6v
24v-23.6v
24v-23.6v
24v-23.6v
24v-23.6v
GND
GND
GND
GND
GND
on/off-3.2v
DIM-no voltage
All of those readings seem to be within the range shown on the power supply. So I checked the voltage going from the power supply to the mainboard, this is what I got:
on/off-3.2v
DIM-no voltage
12v-11.7v
12v-11.7v
GND
GND
GND
24v-23.3v
24v-23.3v
PS-ON-1.7v
5v-5v
5v-5v
GND
Again all those seem to be near the range shown on the power supply. Since the power supply is putting out the correct voltage for both the LED driver and the mainboard, I'm guessing I can rule that out? And since the mainboard is putting out sound and a faint picture, is it possible I can rule that out as well?
Another set of voltages I tested were those coming out of the LED driver. The LED driver was showing voltage going out, but since there is nothing printed on the board, I don't have a reference for what these voltages should be. I can post the voltages I got out of it if someone here knows what the voltage coming out of the LED driver is suppose to be.
Sorry about the long post, just wanted to be thorough. Any help on this would be appreciated.
Forgot to add, those voltages are with the TV on.
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