Vizio e241-a1 not powering up

[FocusMiah]

Hello all! Thanks for reading.

I received the tv as it was not working. When i first got the tv the power light would come on white.

I opened it up and started checking regulators. All seemed fine but the two in red boxes. They are both the same 1084 regulator. The one on the left read from left to right .24, 1.47, 5.08 and the one on the right read 2.06, 3.31, 5.08.

After having the TV plugged in for a half hour or so the reading from all the regulators started to surge. For example if i held the multimeter an anything that was 5.08 i would hear a very faint hum and the power would drop to 4.2ish for a split second and come right back up. Same for any point that showed it had power.

[budm]

Re: Vizio e241-a1 not powering up

5.08V is the standby power supply that feeds those two regulators, the output voltage readings of those two regulators are correct. It sounds like you are having standby power suppl problem or the main board is drawing too much power from the standby power supply.
Please up load the pictures of the whole back side of the TV so we can see all the boards.

[FocusMiah]

Re: Vizio e241-a1 not powering up

Here are the rest of the boards

[budm]

Re: Vizio e241-a1 not powering up

Please up load pictures using 'GO AVANCED'
No pictures of the back side of the TV so we can see how all the boards are connected together?

[FocusMiah]

Re: Vizio e241-a1 not powering up

Sorry misunderstood!

[FocusMiah]

Re: Vizio e241-a1 not powering up

Also if i disconnect the power supply board from the main board. The power no longer surges on the power board, and all the pins from the connector stay steady at 5.08 and 15.86. When its plugged back into the main board the surging starts again and the regulator i have in the square to the left gets extremely hot.

[FocusMiah]

Re: Vizio e241-a1 not powering up

Where would be a good place to start to learn more about circuit boards, components, and how they work or test them.

Books or websites.

[Mike's TV Repair]

Re: Vizio e241-a1 not powering up

Did you find a fix for this TV? I have 2 with the same problem..

[dick_barton]

Re: Vizio e241-a1 not powering up

If the fault is identical and the regulators are geting hot and the voltage is dropping then I can only think of two possibilities.

1. The current required by the main board is excessive.

2. There is considerable voltage ripple on the supply and the capacitors/diodes on the power supply need to be checked.