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Old 03-08-2022, 10:04 AM   #1
Storyteller12
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Default Vizio E65-F0 Backlight On, No Picture

Have this TV with no picture. When I first got it the same symptom. Backlight on but no picture. I check the tcon fuse and it was bad. So I ordered new tcon and mainboard packaged together.

I replaced the tcon and mainboard and still have the same symptom but the fuse on the tcon did not blow.

I tried unplugging one side at a time of the lvds cables and still get no picture. Not even half white screen. Just black screen with backlights on.

Anyone have any suggestions or run into this problem on this model?
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Old 03-08-2022, 10:06 AM   #2
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Default Re: Vizio E65-F0 Backlight On, No Picture

Power supply
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Old 03-08-2022, 10:07 AM   #3
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Default Re: Vizio E65-F0 Backlight On, No Picture

Main board
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Old 03-08-2022, 10:08 AM   #4
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Default Re: Vizio E65-F0 Backlight On, No Picture

Tcon
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Old 03-08-2022, 10:10 AM   #5
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Default Re: Vizio E65-F0 Backlight On, No Picture

Also I found this eeprom chip on the panel buffer board. Never seen this before. Maybe itís bad/ corrupt?
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Old 03-08-2022, 10:21 AM   #6
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Default Re: Vizio E65-F0 Backlight On, No Picture

I would be checking t-con voltages. Maybe panel dragging down a voltage.
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Old 03-08-2022, 11:47 AM   #7
Storyteller12
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Default Re: Vizio E65-F0 Backlight On, No Picture

Did some more digging around and found a few shorted caps I believe.

Itís a group of them coming off that eeprom I mentioned on the buffer boards.

I removed 1 fro circuit and it was shorted. However the group of caps still all test short also.

Not sure how to find which one is bad or if itís the eeprom except for removing each 1 by 1.
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Old 03-08-2022, 11:56 AM   #8
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Default Re: Vizio E65-F0 Backlight On, No Picture

Your photo is blurry but they look black not cap colour suggesting they are inductors and so will read as short.
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Old 03-08-2022, 12:44 PM   #9
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Default Re: Vizio E65-F0 Backlight On, No Picture

Quote:
Originally Posted by diif View Post
Your photo is blurry but they look black not cap colour suggesting they are inductors and so will read as short.
I think you are correct. Itís getting harder to see these small things. Guess Iím getting old.
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Old 03-08-2022, 04:18 PM   #10
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Default Re: Vizio E65-F0 Backlight On, No Picture

Have you checked the PS board? What are its voltages?
Where did you get the mainboard and tcon?
Have you had time to check t-con voltages?

Last edited by captainKKK; 03-08-2022 at 04:22 PM..
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