Vizio d50-f1 no bl no image yes sound

[Afro420ninja]

So I get black screen, but has white light on front when turned on that will fade to off. Has no backlight, had sound, and could see menu with flashlight. Have already replaced tcon and power boards. Not sure if it popped when it went out as I had fallen asleep watching it and woke up to it not turning on. After visual inspection of boards can't seem to find any blemishes or bad capacitors to my eyes. Haven't tested any voltages because I'm an amateur when it comes to electronics so far. Cars have been my specialty for repairs until my Xbox and now my TV went out. Fixed the Xbox, now to fix this any help is greatly appreciated.

[CapLeaker]

Re: Vizio d50-f1 no bl no image yes sound

Measure the voltage on the led strings, see what you get. I am guessing one or more is open (bad LED’s).

[Afro420ninja]

Re: Vizio d50-f1 no bl no image yes sound

Is that possible without removing the panel?

[Afro420ninja]

Re: Vizio d50-f1 no bl no image yes sound

Found the labeling on the pa board I apologize. Forgive my ignorance :/

[CapLeaker]

Re: Vizio d50-f1 no bl no image yes sound

cn5502 on the psu

[Afro420ninja]

Re: Vizio d50-f1 no bl no image yes sound

All I see is cn8602 if you mean that plug in. I tested it and got 20v with TV powered but not on. Also tested on main board at cable going into the back panel from the main board and got 20v and without that cable plugged

[Afro420ninja]

Re: Vizio d50-f1 no bl no image yes sound

What SHOULD it be? And that only comes through on 2 pins. The rest are 0

[R_J]

Re: Vizio d50-f1 no bl no image yes sound

All I see is cn8602 if you mean that plug in. I tested it and got 20v with TV powered but not on. Also tested on main board at cable going into the back panel from the main board and got 20v and without that cable plugged

You need to check the voltage on CN8602 pins (14,13,12, or 10) while turning the tv ON. I suspect you have an open led in the panel, There seem to be 8 led's per string with 4 strings.

[CapLeaker]

Re: Vizio d50-f1 no bl no image yes sound

My bad, CN8602… couldn’t read it. you need to manage to read the Voltage on each LED string while being connected to the LEDs. LEDs are current controlled, not voltage controlled. With that LED plug disconnected, you should see voltage ramping up fast while turning the TV set on, then ramping down again while then staying at a low voltage like your 20V.