Vizio M602i-B3 No Backlights

[landyboy]

Re: Vizio M602i-B3 No Backlights

yes to the 15v and no change to screen if Tcon is disconnected.

[landyboy]

Re: Vizio M602i-B3 No Backlights

Possible bad Main board?

[budm]

Re: Vizio M602i-B3 No Backlights

Can we see the pictures of the whole back side of the TV showing all the boards?
You also need to find out if there is 12VDC at both ends of the SMD fuse on the T-CON board or not.

[landyboy]

Re: Vizio M602i-B3 No Backlights

There is 12vdc at both ends of the SMD fuse on Tcon

[landyboy]

Re: Vizio M602i-B3 No Backlights

Bad TCON?

[budwich]

Re: Vizio M602i-B3 No Backlights

which cable(s) are you disconnecting at the tcon? you need to do one at a time and also you need to hit the menu or have something feeding an input to hopefully find some thing on the screen otherwise it might go into "screen saver / no input mode".

[landyboy]

Re: Vizio M602i-B3 No Backlights

The top hard connectors. Are they correct ones?

[budwich]

Re: Vizio M602i-B3 No Backlights

not really... those provide the "inputs" to the tcon... if they are disconnected, then the tcon will be somewhat "mindless". The bottom connectors pass "processed" signals to the panel... disconnecting them one at a time may tell you more about whats happening from the tcon to the panel and beyond.

[landyboy]

Re: Vizio M602i-B3 No Backlights

so when I disconnect the bottom ribbon cable one at a time. Ones side disconnected half of screen turns grey fuzzy, no response from pressing menu or any other key. Reconnect that side disconnect other same half of screen that was grey turned purple. Still no response from menu key.

[budwich]

Re: Vizio M602i-B3 No Backlights

hmmmm... somewhat unusual for a vizio... I would have expected the disconnected half to go white while the connected side maybe anything but white... depending on what the input is. Can you post a picture of the display during these two tests... note: all other cables are connected appropriately during this test... right?

[landyboy]

Re: Vizio M602i-B3 No Backlights

Ok did it again. Not sure why I got the purple before. These are the two screens I got.

[budm]

Re: Vizio M602i-B3 No Backlights

The cable you are doing are the flat pinkish color cables between T-CON board and the LCD panel, correct?

[landyboy]

Re: Vizio M602i-B3 No Backlights

correct

[budwich]

Re: Vizio M602i-B3 No Backlights

Ok did it again. Not sure why I got the purple before. These are the two screens I got.

that's more like it.... to me this indicates that the tcon to panel (and beyond) appear to be responding appropriately, so the question remains, why isn't the signal getting into the tcon to be displayed. Are you sure that you have something to display... either menu or some other input.

[landyboy]

Re: Vizio M602i-B3 No Backlights

Yes I have tried menu key on remote and many other keys with nothing appearing on the screen.

[vinceroger69]

Re: Vizio M602i-B3 No Backlights

do you get sound if you try a dvd/games console?

[landyboy]

Re: Vizio M602i-B3 No Backlights

no sound I introduced a video source and still nothing

[landyboy]

Re: Vizio M602i-B3 No Backlights

I'm now thinking maybe a bad main?

[landyboy]

Re: Vizio M602i-B3 No Backlights

Ok ordered and replaced the main board. Now it gets weirder. When first powered on the back lights get brighter than before but then get dimmer and lightly flash occasionally. I press the menu button and the screen appears to lighten in the area of where the menu is supposed to be but still no picture or menu. I disconnect the ribbons one at a time below the tcon and this time nothing really happens. No one side grey like before.

[landyboy]

Re: Vizio M602i-B3 No Backlights

Changed power supply no change.