Re: Vizio P42HDTV10A: no picture, no sound
Bringing this thread back from the dead. I've finally decided (after 2 years!) to dig into this TV to see why the DTV tuner does not work.
I've been using the Cable, RGB and Composite inputs for years with no issues. Picture and sound all work for those. However, the TV does not seem to recognize the Digital Tuner. If I pick DTV as an input, it does not even bring up an icon to scan for channels, and ultimately will just turn itself off from "no input". I have spare DTV and Main AV boards that I have swapped in with...
MattC
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Last Activity: 11-18-2013, 09:20 PM
Joined: 08-19-2011
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Re: Vizio P42HDTV10A: no picture, no sound
There is a switch on the main power board labeled AUTO/NORMAL. It was switched to AUTO. I switched it to NORMAL and all is well. Everything now works as it should. I have 3v or so going to the sus boards when plugged in and the power off; and no light up of the screen. Perfect.
TV shuts itself off when I try to use the DTV tuner, but I have another tuner board I can swap in, or I'll just leave it as is. I don't plan to ever use the tuner and all the other inputs work fine; so we'll see.
Thanks for all your...Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
They are getting the proper voltage as if the power button was on - 186v and 60v....Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
So I think I'm largely good to go. I was measuring the Ysus outputs wrong, one pole to ground instead of across the resistors. (told you I was a beginner!) So, now I have a clear picture, TV turns on and off at will and everything generally works. I didn't have an oscilloscope to measure the waveforms but instead tuned them in to where the TV looked clearest. Maybe I'll borrow one to do it right, but for now, seems everything works.
I still have one issue I mentioned above.
In addition, here is the status of...Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
Did a little more testing and noticed I get power out of the main power board to the x and y sus boards regardless of if I hit the power button on or not (ie front led is green or orange). Is that right?
if i tmeans anything, with all output wires disconnected form the y sus board (including the y buffer board) the Vsc output is 5v and the Vy is 16.Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
Update: So I got and installed a rebuilt Ysus board from Coppell TV Repair in Texas via eBay. I installed it and have both X and Y boards hooked up and getting proper voltage to them from the power board. Seems all is now well there.
I still get the proper 100v out of the XSus board.
On the Ysus board the output voltages are off. A) I can't reach the proper output voltages (Vy = 200 and VSC = 125), even with the adjusters turned all the way up, and B) the output voltages constantly change by up to 20v. I have...Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
So then tonight, out comes the Ysus board! Looks like online/eBay replacements are not terribly expensive for a full board. My soldering skills are average, so I'd probably cook the board trying to replace the hybrid.
Yea, I saw U33 mentioned in some other threads. I couldn't find it either. Worst case, if the main was bad too, I have an extra for this thing I can swap in.
Stay tuned, I'll let you know how things go with the Ysus....Last edited by MattC; 08-30-2011, 08:51 AM.Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
PlainBIll, thanks for your replies!
I'm using board mounting screw heads as ground points. Generally either the one on the bottom middle of the main power board, or the one below that, that only holds down a ground wire. I try other random ones as well to confirm my readings.
Also, I ran to the shop and got my decent meter instead of the crappy harbor freight one I keep at home. I think it may be busted or I was on some wrong setting when I tested prior.
I pulled all three connectors in the upper left...Last edited by MattC; 08-29-2011, 11:22 PM.Leave a comment:
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Re: Vizio P42HDTV10A: no picture, no sound
You know, in all the forums I frequently post on, it drives me nuts when people don't use the forum to host pictures for threads; so I have no Idea why I didn't do that here! Sorry!
In any case, attached are 3 pics. If they are not good enough, let me know....Leave a comment:
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Vizio P42HDTV10A: no picture, no sound
I've done a bunch of forum reading and have a similar story as often posted: I got a Vizio model P42HDTV10A 42" plasma for free from a friend. No picture (either from any source or a startup screen) and no sound. TV has an orange led when on standby, turns green when powered on. Can not be turned off other than by pulling the power cord.
I can solder, desolder, can read a circuit diagram and work a multi meter so I thought I'd make a project out of getting it to work. That being said, this is my first experience inside a TV. Hopefully with all your help I can get it going again,...
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