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Old 07-23-2021, 08:09 PM   #1
knoxrebel
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Join Date: Oct 2009
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Default Bad vizio v505-g9 backlight or video board.

Getting picture but no backlight. Getting 45v every white wire on led connector. Could it be anything else other than a bad backlight? Would assume that the 4 strips would be independent of each other.
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Last edited by knoxrebel; 07-23-2021 at 08:19 PM..
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Old 07-23-2021, 08:25 PM   #2
R_J
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Default Re: Bad vizio v505-g9 backlight or video board.

45v is the led supply, which might be high indicating an open string. There seem to be 9 led's per string at 3v each would be 27v. The 4 return lines are 0 volts likely because the led driver is in protection.
I would suspect bad led's in the panel

Last edited by R_J; 07-23-2021 at 08:35 PM..
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Old 07-23-2021, 10:26 PM   #3
knoxrebel
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Default Re: Bad vizio v505-g9 backlight or video board.

Unfortunately you were correct. 1-2 bad leds per strip.
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