vizio vp50 hdtv20a black screen but sound works

[jcer93705]

Hi guy's I have a vizio vp50 hdtv20a I don't have knowledge to fix them and so I wanna learn. https://www.youtube.com/watch?v=GJKMWbSXwf0 Very odd logic board one led is blinking the other one on same board isn't but the y main board has a sold yellow light. Now is the logic board letting me know that the y main board isn't working? I heard when y buffer top and bottom that connect to y main board when that fail mostly y main board fails too is that true? Please help me. Ty

[Sparkey55]

Re: vizio vp50 hdtv20a black screen but sound works

Hi guy's I have a vizio vp50 hdtv20a I don't have knowledge to fix them and so I wanna learn. https://www.youtube.com/watch?v=GJKMWbSXwf0 Very odd logic board one led is blinking the other one on same board isn't but the y main board has a sold yellow light. Now is the logic board letting me know that the y main board isn't working? I heard when y buffer top and bottom that connect to y main board when that fail mostly y main board fails too is that true? Please help me. Ty

Mine does the same thing with the blinking green led and one solid led. Just recapped the power supply it had some swollen Samxon caps. The TV is working fine though except the tuner does have problems with OTA channels in the VHF range.

[jcer93705]

Re: vizio vp50 hdtv20a black screen but sound works

Mine does the same thing with the blinking green led and one solid led. Just recapped the power supply it had some swollen Samxon caps. The TV is working fine though except the tuner does have problems with OTA channels in the VHF range.

Would that cause the Y main board to have solid green?

[jcer93705]

Re: vizio vp50 hdtv20a black screen but sound works

Mine does the same thing with the blinking green led and one solid led. Just recapped the power supply it had some swollen Samxon caps. The TV is working fine though except the tuner does have problems with OTA channels in the VHF range.

I did found a fuse with a crack on it.

[dick_barton]

Re: vizio vp50 hdtv20a black screen but sound works

Ceramic fuses don't generally crack. I've see glass fuses vapourise. I would remove the fuse and check that there's no short circuit before replacing it.
There's no photo's so I don't know where this fuse is in relation to your set.

[dick_barton]

Re: vizio vp50 hdtv20a black screen but sound works

I see you're running this on two threads which is going to prove confusing to anyone offering help.

[jcer93705]

Re: vizio vp50 hdtv20a black screen but sound works

Okay so I powered without the top y and no picture. Led is off on Y main board. The logic board one led still blinking. The y main board is buzzing. Without the bottom y board. Then I removed the bottom one. Y main board still have led off still have a buzz. The logic board still blink. Any ideas? Also powersupply has been replace few years back. And that broken fuse still works still attach.

[jcer93705]

Re: vizio vp50 hdtv20a black screen but sound works

Bump

[tw2005]

Re: vizio vp50 hdtv20a black screen but sound works

Is this the board? samsung panel?

As far as I'm aware, the lit LED on the ymain indicates a fault.

This series is well known for blowing the upper y board and usually takes the ymain with it.

you could probe the FETs for short cct. the 88N30W are common ones to short out.

The upper buffer often you'll find a pin hole or burn. But you may have to use a meter to see if the buffer outputs are shorted.

I don't think you will get any image running just the lower board.

There should be some videos around for the buffer checks.

Not sure how obtainable those ybuffers are. They were hard to get about 4-5 years ago.

here's some models you could search for more threads.

50PFP5332D/37

P50HDTV20A VP50HDTV20A

DP50747 P50747-00

HPT5064 HPT5054, HPT5034X

PS50q91hd, PS50C91HD, ps50q96hd

https://www.youtube.com/watch?v=u3kxguwyIpw

https://www.youtube.com/watch?v=e1ulsDRLxfk

https://www.youtube.com/watch?v=3fdmJbJyYmI