Check the electrolytic capacitors in the PSU, you need an ESR meter to do this - often this is all that fails.
Vizio TV Repair, Please Help
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15th January 2009 04:51 PM #1tblake
Vizio TV Repair, Please Help
Hi Guys,
Thanks so far with the great advice. I have another question I was hoping someone might be able to help me out with.
My friend has a 42" Vizio LCD TV. He's had it for over a year. The warrenty is expired (go figure).
When you turn it on, all that is viewed is a bunch of colored horizontal lines flickering and dancing around all over the place. There is no sound, and no way to access the menu/change channels.
He brought it to Best Buy (where he got it from) and the geek squad looked at it and said it would cost more to repair it than a new one is worth.
I offered to find out as much as I could about the problem and possible solutions for him. I did take a sememster of electronics in college and a single class in HS, so I sort of know what I'm doing. I just dont have a place to start with this TV.
Any help would be greatly appreciated. Thanks Again!
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15th January 2009 04:56 PM #2Nigel Goodwin
Super Moderator0PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
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15th January 2009 05:08 PM Thread Starter #3tblake
Thanks Mr. Goodwin. I will have a look. By PSU you mean Power supply unit? I'm unsure if this one has an external power supply or if AC power cord is hooked durectly to the TV. I dont have the TV in front of me.
How would I go about checking capacitors? The only time I've ever dealt with them is when they have melted when transistors when out in other electronic equipment.
How could capicitors cause this screwy display output? (not providing enough voltage?)
Thanks!0Last edited by tblake; 15th January 2009 at 05:08 PM.
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15th January 2009 05:11 PM #4Nigel Goodwin
Super Moderator
Yes, capacitors in the power supply - even if there is an external unit, there is still an internal power supply as well.
You require an ESR meter to test them, although if you're lucky you may spot some with domed tops.
PSU problems can cause all kinds of strange effects.0PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
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15th January 2009 05:21 PM Thread Starter #5tblake
Sorry, my elecronics knowledge isnt up to par (ESR Meter?)
I have a multimeter with all sorts of different settings, am I able to use that to test them with that?
Thanks!0
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15th January 2009 05:37 PM #6Nigel Goodwin
Super ModeratorNo - third time - ESR METER
Originally Posted by tblake
0PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk
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15th January 2009 06:08 PM #7picbits
Based on that statement I'd really advise against messing about with the innards of this set and maybe speak to a local repair guy who will have an ESR meter and the tools to perform other tests without frying themselves Originally Posted by tblake
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15th January 2009 06:12 PM #8blueroomelectronics
Unless you can visually see a damaged component, without schematics and a fairly high level of electronics experience your chances of repair are slim to none.
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15th January 2009 06:30 PM Thread Starter #9tblake
well its a big waste of space as it is.
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15th January 2009 06:48 PM #10picbits
Just hang it on the wall and pretend you are rich. Originally Posted by tblake
I always meant to recess our 32" CRT television into the fireplace to make it look like a plasma many years ago. That was back in the days a plasma cost the same as a good secondhand car
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