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Old 08-17-2019, 03:18 PM   #141
nomoresonys
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Default Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Ok, now to make the fix last as long as possible, cut a hole in the back cover of the tv, right where the bga is and install a fan so it can run as cool as possible.
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Old 09-15-2019, 10:01 PM   #142
d(-_-)b
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Thumbs up Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Quote:
Originally Posted by philtvman View Post
Digging this old thread up. Had a unit with same symptoms...no picture, no backlights, power light slowly faded out...Replacing EEPROM didn't fix it. Before I picked up a board for $125 on eBay, I threw the old main into the oven at 400F for 12 minutes, let it cool for 30, and *poof* fired up just fine. No idea how long it'll last, but hey it's better than a dead set


IT WORKED!!! THANK YOU ALL !!!

I cooked the Mainboard for 12 min @ 400 F and let it cool until next day (I actually forgot about it) and next day I decided to give it one more try before dumping the whole set in the dumpster since nothing worked in the past 4 months (EEPROMs, transistors...). Sure enough the tv is working just fine for 2 days now (roku and plex mostly) with no issues whatsoever.

I'll post back if/when (hopefully not, knock on wood) the tv goes bad again. Till then many thanks to those who posted this possible fix since my board it's not available anywhere.
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Old 10-20-2019, 04:01 PM   #143
d(-_-)b
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Default Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Quote:
Originally Posted by d(-_-)b View Post
IT WORKED!!! THANK YOU ALL !!!

I cooked the Mainboard for 12 min @ 400 F and let it cool until next day (I actually forgot about it) and next day I decided to give it one more try before dumping the whole set in the dumpster since nothing worked in the past 4 months (EEPROMs, transistors...). Sure enough the tv is working just fine for 2 days now (roku and plex mostly) with no issues whatsoever.

I'll post back if/when (hopefully not, knock on wood) the tv goes bad again. Till then many thanks to those who posted this possible fix since my board it's not available anywhere.
Well...looks, like any miracle, it didn't last for too long. Slightly more than a month. Last night I baked the board again and it's working fine again. This time for 15 min and slightly lower in the oven.

Will see how much will last this time.
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Old 05-09-2020, 10:54 AM   #144
JeffN9
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Default Re: Vizio P502UI-B1E has no backlight, no voltage from driver board to LED's

Hi. New member here, first post. Not meaning to revive an old thread but just wanted to add myself to the list of folks that had success with the main board oven baking trick.

I purchased the tv for next to nothing from someone that wanted to get rid of it. The symptoms included no backlights, picture or 24V anywhere on the power supply board. It did have 12V but not 24. The power light either came on and then faded after a few seconds or flashed 15 times and then repeated that after a minute or so, as if it was cycling. I removed the sticky pads from the bottom of the board and cleaned the gunk off as someone else did. After that I baked the board for 12 minutes at 400 deg. F. I let it cool for 30+ minutes and then reinstalled the board. VOILA the tv fired up and appeared to have all normal functions. 24V is now where it's supposed to be.

Of course the question now is how long the repair will last?? At the very least I now know which board was defective and can replace that when/if the problem reappears.

I want to thank those that posted their oven bake successes! I was very close to buying a power board thinking that was the culprit until I found this thread. The information saved me a lot of time and money. This forum has a lot of great information.

What I would like to know now is how long this repair is lasting for those that have done it.
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