Re: V042L no picture, but sound, bad MOSFET?
How can I tell if the IC needs to be replaced? Also, if I do the mod linked above by PlainBill, will I still have to replace the IC?
djsmith
Solder Fumes
Last Activity: 08-04-2012, 07:45 PM
Joined: 01-01-2012
Location: Salt Lake City, UT
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Re: V042L no picture, but sound, bad MOSFET?
No, because I damaged it during removal....Leave a comment:
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Re: V042L no picture, but sound, bad MOSFET?
kc8adu: How can you tell that IC is bad? It looks fine to me.Leave a comment:
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Re: V042L no picture, but sound, bad MOSFET?
Before soldering the new MOSFET on to the board, I believe the two pads (where the MOSFET leads connect) actually read low resistance between them. That surprised me, but I am an electronics newb, so I let it go.
Would that indicate a problem somewhere else (not the MOSFET)?Leave a comment:
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Re: V042L no picture, but sound, bad MOSFET?
The plot thickens!
I received my MOSFET by mail today and soldered it on to the board. When I measured the resistance across the two leads, it measured the same as before (much lower than the others), which concerned me. And sure enough, the TV still exhibits the same symptoms.
What could this mean?Leave a comment:
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Re: V042L no picture, but sound, bad MOSFET?
bbjunkie: here's the photo you requested of R202 and R206 (unrelated to this problem for future readers)....Leave a comment:
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Re: V042L no picture, but sound, bad MOSFET?
So what do you think about this mosfet site now that I removed the mosfet?
I added a little solder to the two pads and the mosfet site itself. I took this photo with my iPhone through my microscope (thought that was pretty cool)....Leave a comment:
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Re: V042L no picture, but sound, bad MOSFET?
I attempted to desolder the MOSFET for the purpose of measuring its resistance out of circuit. I'm embarrassed to say that my tools were not up to the task (certainly, my soldering skills couldn't be questioned, right!).
I used a wide-tip soldering iron, untinned (woops), and by applying a little too much torque to the leads to lift them from the pad while applying heat, I actually *broke* the leads free from the mosfet.
In doing so, I appear to have damaged the pad and trace where the leads connected. Photo...Leave a comment:
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V042L no picture, but sound, bad MOSFET?
I have a Vizio V042L. It's about 4 years old, and I had one inverter board replaced by a local repair shop about a year ago when it exhibited the same symptoms as these threads:
[url]https://www.badcaps.net/forum/showthread.php?t=14667[/url]
[url]https://www.badcaps.net/forum/showthread.php?t=18010[/url]
Now it's happening again: no picture, but all other functions in tact, including audio, but my problem seems different from those other threads (hence the new thread).
When I plug the set into the wall, the Vizio logo illuminates orange. When I press... -
Re: Vizio V042L, No picture, Has sound
Orin, could you post a link to the replacement parts (you replaced both boards right)?
I think I have the same problem.
Thanks!Leave a comment:
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