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Old 05-02-2018, 04:46 AM   #111
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Default Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Reading through this very long thread it appear from post #1 there is no 5v at the 5V point. Says no wire.

The checks that have been made are:-
Do you have approximately 400V across the two pins of the large capacitor on the power supply when you come out of standby

Pins 1 - 4 = 24V
Pins 5 - 8 = 0V

CN805 with backlights on
Pin 1 0V, Pin 2 = 1.5V, Pin 3 = 3.2V, Pin 4,5,6 = 0V
Pin 7 = 4.9V, Pin 8 = 4.2V, Pin 9 = 12.2V, Pin 10 No connection

On the led driver board
R8129 = 4.1V
C8067 = 1.8V

Do you have these voltages?
Willing to help but I'm no expert.

Last edited by dick_barton; 05-02-2018 at 04:48 AM..
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