I have a Vizio 550I-B2 LWJ2PPAQ Tv. One day screen went black but had sound. I never could see any semblance of pic with flashlight check. I replaced power supply board - tv booted up and picture went black with sound in 5 minutes. I will attach images of original and new power supply as well as LED driver. One capacitor looks crooked but unsure if that means anything. 16 pin connection looks fine.
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Check CN101, CN201 and CN202 with a multimeter. See if you get the voltages that are needed from your board. This "tv booted up and picture went black with sound in 5 minutes." is usually an LED issue, so check/replace your LED driver board (if your power board supplies the right voltageto it (CN201/CN202)). The only thing after that is your main board.
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There can be a number of reasons for a black screen, but the most common is a failure of the back light. This can be a power problem where the LEDs don't get power or even an LED or two being open and thus not lighting. The fact that no picture was seen with a flashlight concerns me a bit. This may indicate that the TV is being told to produce a black screen. If so, than this may be a problem with the logic board (the one under the shield in the pictures.)
Some poking around with a meter is called for here. If you feel comfortable doing this, update this posting and we'll provide more instructions on what to check.
Dan
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Jolee, did you get this fixed? I replaced the power board but still nothing. I can see with a flashlight that the tv is on though?
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Similar answer for you. A single LED can be out or a strip. It can also be a component failure on the LED driver board. Check the voltages as suggested by Oldturkey03 as well.
I'm in the same boat. I replaced the power board. And I can't get my tv remote to work. I hate to trash the tv, but this is frustrating. BSOD!
@John Todd what make and model is your TV? Why did you replace the power board? what were the symptoms before you changed it and what are the symptoms now?
F****** Chinese POS! I now have exact same problem of no backlight but can see Pic with flashlight. I'm done with this Chinese POS. Wasted a whole day f****** around with it.
@ozzie72 "no backlight but can see Pic with flashlight: good indication that this is your backlight array that has failed. Definitely fixable but a PITA
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Check CN101, CN201 and CN202 with a multimeter. See if you get the voltages that are needed from you board.
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