Recently had my bedroom Vizio D40u-D1 apparently die while it wasn't being used. Noticed the power LED flashing, figuring maybe a software upgrade, but attempting to turn it on proved that wasn't the case. When powered on, the power LED will flash a bunch of times after about 2 minutes then turn off again. Definitely is no picture even with a flashlight on the screen. Had the opportunity to open it up over the weekend. Doesn't apper to be anything out of the ordinary visibly inside, nor any odd smells of escaped magic smoke. Readings from the connector in the corner of the power supply board are as follows:
I'm not versed at all in these but it seems like the power supply is at least doing something with the exceptiong of BL_ON/OFF which is only changing a smidge (not enough?). Also not sure if the +19V readings should remain constant or if the lower readings on standby are normal. I tried heating up the processors on the mainboard with a hair dryer as I don't have a heat gun but that didn't do much of anything. Other things maybe of note: the small LED on the mainboard is red when in standby and purple/blue (?) when the TV is powered up and when I do turn it on, I can't turn it off with the remote or the power button, have to wait for the TV to power itself off.
So what's my likely course of action here? Swap out the mainboard or test some other things?
desc: | standby: | "powered on" | desc: |
BL_ON/OFF | 0 V | 0.02 V | |
2D/3D | 0 V | 0 V | |
GND | - | - | |
GND | - | - | |
+19V_A | 16.49 V | 19.07 V | |
+19V | 16.49 V | 19.06 V | |
+19V | 16.49 V | 19.06 V | |
+5V | 5.15 V | 5.13 V | |
0.08 V | 3.68 V | PS ON | |
0.08 V | 3.68 V | PS ON | |
- | - | GND | |
- | - | GND | |
16.49 V | 19.07 V | +19V_A | |
16.49 V | 19.07 V | +19V | |
16.49 V | 19.07 V | +19V | |
5.15 V | 5.13 V | +5V |
So what's my likely course of action here? Swap out the mainboard or test some other things?
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