Vizio LED xvt553sv

[mnpdreed]

Re: Vizio LED xvt553sv

Here is the amber led on back of led driver board

[budm]

Re: Vizio LED xvt553sv

You are not having backlights problem, the T-CON is not getting the the Voltage to run.

[mnpdreed]

Re: Vizio LED xvt553sv

Ok my bad. The cable in main board was not seated well here is the new reading. Same on both sides 106.8 mV

[mnpdreed]

Re: Vizio LED xvt553sv

The backlight is on just no picture or sound

[mnpdreed]

Re: Vizio LED xvt553sv

What voltage should be there?

[mnpdreed]

Re: Vizio LED xvt553sv

Pic of main board

[mnpdreed]

Re: Vizio LED xvt553sv

Main board fuse readings

F1 12.28 V
F3 5.09 V
F8 18.34 V

[mnpdreed]

Re: Vizio LED xvt553sv

Main board fuse readings

F1 12.28 V
F3 5.09 V
F8 18.34 V

[budm]

Re: Vizio LED xvt553sv

What voltage should be there?

per spec, it should have 12VDC.
http://www.lcdsolar.com/products/Pro...8#.VC2qG_ldV8E

[mnpdreed]

Re: Vizio LED xvt553sv

Do you have any suggestions on where to check the main board as to why it isn't reaching TConn

[budm]

Re: Vizio LED xvt553sv

Well, without the diagram, you will have to trace out using Ohm meter from one end of the fuse on the T-CON board to the main board to find out which component has the lowest resistance reading, that will be the switching device (more likely to be MOSFET).
I will guess some thing in that red section I marked.

[mnpdreed]

Re: Vizio LED xvt553sv

Ok will do that and get back with you. Thank you for the help

[mnpdreed]

Re: Vizio LED xvt553sv

I just found out from the guy I got the TV from that when the TV first stopped working having no picture or sound that he bought a refurbished main board and installed and had same results. Based on what you see so far do you think the problem is in main board.

[budm]

Re: Vizio LED xvt553sv

Yes, the new board can be bad, you will not really take the word of the seller that the board is good or bad for sure.

[mnpdreed]

Re: Vizio LED xvt553sv

I traced from TCon to main board then to where the ribbon comes from the power supply to the main board . Only had 5 volts on three pins all other read m volts. Traced ribbon to power supply same readings.

[mnpdreed]

Re: Vizio LED xvt553sv

So I'm losing the voltage at the power supple I think. Do you have any advice from here

[mnpdreed]

Re: Vizio LED xvt553sv

Her is pic of power supply

[mnpdreed]

Re: Vizio LED xvt553sv

On "CN202" the right three pins read 5.1 volts. All others read in milivolts

[budm]

Re: Vizio LED xvt553sv

The ribbon cable from the T-CON on the pin that the 12V from the main board is fed into will get the 12V through a switched device (3-pin device), that is the device you need to find on the main board.

[mnpdreed]

Re: Vizio LED xvt553sv

Ok I will try and find it but I'm not getting the 12 volt at all from the power supply would that matter