Question about Vizio VW46LFHDTV10A 46 in. LCD TV

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Will not turn on i replace the power supply and the same. should i be getting 24volt and 12 volt reading from power supply.or is there something i need to do to turn that part of the suppy on.

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Did you ever fix this tv? I just baught this model of tv used, got it home and the kids threw a toy at it and shattered the left bottom corner of the screen. am looking for a replacement screen before I sell the rest for parts. You can contact me at facerhighperformance2006@yahoo.com. Thanks.

Posted on Dec 14, 2009

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The power supply, much like the Motherboard on a PC has a "Signal Good: type power switch. You can short it out or use a small microswitch to keep it on. Even though the power button on the TV itself may be a momentary on/off switch, the circuitry in the Main Board of the TV keeps the connection back to the power supply shorted until you press the power button again. You should be able to just short across from the 12V to Pwr On - in most LCD TV's it should be on the same connector. This is the connector that goes to the Main board - as opposed to the two other adpators (on most) which will go left and right to the TV's Inverters.

Posted on Oct 18, 2009

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You should be getting the same reading of voltage from the power supply as it is rated on the case of the supply. There should be a output rating the the cas of the supply and whatever reading you are getting should be within 1 volt. If you replaced the power supply and this one is testing at the right voltage then the problem is within the television.

Posted on Oct 07, 2009

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When my computer starts the power light will blink and the fan starts. When the computer first had problems it froze and the fan turned on and wouldnt stop. I also smelt a burnt rubber smell. I read to...


Yes the voltmeter measures the voltage.
When you power up the computer to test the voltage on the 4 wire connectors.
Test the voltage red and balck wire should read 5 volts.
Test the voltage yellow an black wire should read 12 volts
If the burning smell is from the power supply then most likely a capacitor has blown in the switch mode power supply.
I would advise you purchase a new power supply, do not try and repair it, these mains devices can be dangerous if you don't have knowledge.

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You press the button and it donest turn on all the time


DO NOT OPEN A POWER SUPPLY!!!!

NEVER!

Inside an SMPS, (Switched Mode Power Supply), are Electrolytic Capacitors.

http://en.wikipedia.org/wiki/Switched-mode_power_supply

http://en.wikipedia.org/wiki/File:ATX_power_supply_interior-1000px_transparent.png

http://en.wikipedia.org/wiki/File:Capacitors_electrolytic.jpg

(Radial. The bottom capacitor in the photo)

Electrolytic Capacitors slowly build up a charge, then release it all at once.
You can compare it to a large swimming pool being filled up with a garden hose, and then one wall of the pool being taken down all at once.

At the bottom, of the Radial (Style) Aluminum Electrolytic Capacitor shown in the above photo link, are two leads.
One is Positive, the other is Negative.

Touch your finger/s to the terminals on the bottom of one of these babies, and the shock can be BAD to FATAL!

If your fingers touch, and complete a circuit that one, or more capacitors are in, the shock can be BAD to FATAL!

Don't open that power supply!

Besides, a fuse goes out All At Once.
There is no work a little bit, then turn off.
It just goes Poof!
(The fusible element inside burns into two separate pieces)

Now,

"You press the power button, and it doesn't turn on all the time"

As has been suggested, I also concur that you have a bad power supply.

But you could also have a bad Power On switch, located inside that plastic Power On button.

This is an example of a Power On switch, that I have found fits a lot of computers,

http://www.directron.com/atxswitch.html

I'd like you to get this switch, and install it.
From there the diagnosis will go to the Power Supply.

Also would like you to make sure the ram memory is seated tight, and the Processor fan is spinning, and looks to be spinning at the right speed.

If the fan spins a few times, and stops, then spins a few times, you know the fan has a bad bearing. Replace.

If it looks to be spinning too slowly also, you'll know it

Be sure to follow anti-static precautions before you reach inside your computer, and the computer is unplugged from power.
If you do not know what anti-static precautions are, I'll be glad to tell you. Simply state so in a Comment.
(Believe upper right of your page)

As for the Power Supply test, you need either a multimeter, or a power supply tester.

An inexpensive multimeter, that will work just fine for this application, ranges from $6 to $12. The Voltages are only 3.3 Volts, 5 Volts, and 12 Volts. (DC)
Two C cell flashlight batteries are 3 Volts. (DC)

Your computer power supply puts out three main Voltages, as stated above.
A) 3.3 Volts (3 point 3)
B) 5 Volts
C) 12 Volts

Orange insulated wires are 3.3 Volts
Red wires are 5 Volts
Yellow wires are 12 Volts

ANY Black insulated wire is a Ground wire.

This is DC Voltage.
There is a Positive, and a Negative.

The Positive (Red) probe lead of the multimeter touches a power wire. (3.3, 5, or 12)

The Negative (Black) probe lead touches ANY Ground wire. (Black)

IF, the 12 Volt power rail shows 11 to 13 Volts, the diagnosis indicates the Power Supply to be good.
(However read on)

IF the 12 Volt power rail shows 11 Volts, or less, the Power Supply is bad.

This is an example of a power supply tester,

http://www.directron.com/pst03.html

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I would suspect a bad power supply. Before doing anything make sure power is actually getting to the computer. Check the power cord with a volt meter. You should have around 115 volts. If all is well you need to see if the power supply is putting out the correct voltage. Open the PC up and set the multimeter to DC voltage.
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply. Curtorsey: IT Professionals

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Power supply suddenly 'dead'


You check the power supply using multimeter. but before everything make sure the you are getting power from the power outlet.

Here is how you can check the power supply with multimeter

If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

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