which is main board lg lc2d

[mattstolte]

I got this tv its a older lcd and it tuens on but screen just blue. No sound or anything so i figure its main board but i cant determine which one of these boards is the main or please explain to me why there is two baords and what the difference is?

[MagicSmoke]

Re: which is main board lg lc2d

Looking on fleabay this appears to be main.

http://www.ebay.com/itm/LG-part-3911...item2ed3b5ee86

[tom66]

Re: which is main board lg lc2d

Dark blue, only faint backlight glow, or solid blue, like "No Signal" colour?

[mattstolte]

Re: which is main board lg lc2d

Like a faint backlight glow maybe a dark blue? But i would say its dark blackish blue with a faint glow

[mattstolte]

Re: which is main board lg lc2d

So which one of these would be considered main?

[tom66]

Re: which is main board lg lc2d

Left hand one. Right hand one is just analog inputs.
I do not think it is main board. Have you checked the fuse on the T-con board?

[mattstolte]

Re: which is main board lg lc2d

but tom wouldn't I have sound if it was tcon?

[tom66]

Re: which is main board lg lc2d

Not always. In one example I had, a user had muted the TV accidentally whilst trying to get the picture back. The fault was the inverter - only - fixed that and then unmuted the sound. Also the previous owner could change the sound options in the menus for example turning off the speakers, changing audio output mode, etc. Don't rely on a single fault for troubleshooting - you need to check some things 1st.

[mattstolte]

Re: which is main board lg lc2d

fuse is good

[mattstolte]

Re: which is main board lg lc2d

ok so I replaced the main board which is he one on left side. and still same thing. tv lights up but screen still black. so I got 2 other options either tcon board or is it possible its the input board on the right?? I tested fuse on tcon its good. but I imagine tcon still go bad with fuse being good. so any help guys?

[multimeter]

Re: which is main board lg lc2d

what voltage are you getting on the t-CON fuse,using black probe to cold ground red to fuse?

any visable faint picture using a strong light?

tried re-seating LVDS cable?at both ends.

do you see backlights through the holes in the rear of the panel with lights off?

voltages ok on power supply?

[mattstolte]

Re: which is main board lg lc2d

what voltage are you getting on the t-CON fuse,using black probe to cold ground red to fuse?

any visable faint picture using a strong light?

tried re-seating LVDS cable?at both ends.

do you see backlights through the holes in the rear of the panel with lights off?

voltages ok on power supply?

yes backlight is on the whole time. I resetted lvds cable both ends. its just backlights no picture

[tom66]

Re: which is main board lg lc2d

I think you should check AVDD, VGH, VGL and 3V3/VDD/VCC on the T-con board, there should be test points. I do not think the analog board can cause the issues you are having.