lg 32lk450 black screen

[Techboxcomputer]

I am very unfamiliar with the inside of this one as it has a different type of board in it. To make a long story short, No display at all, I checked my voltages from the power board to the main,all are correct according to what is printed on the board, ran the flashlight test and I see no type of image. I have a red standby power light that switches up to a regular power light and holds steady after pressing it to turn it on. That's where I am at and what I know how to do with this one.
Suggestions or experiences with this model?

Thank you

[dick_barton]

Re: lg 32lk450 black screen

Some photo's of your boards and connector pin names with voltages alongside will probably get this thread some attention.

[budm]

Re: lg 32lk450 black screen

Show us good clear pictures of the whole backside of the TV showing all the boards.
You said the power supply Voltage are OK, it that including ALL the control Voltages?
What are the control Voltages you are getting when TV is OFF and when TV is turned on?

[Techboxcomputer]

Re: lg 32lk450 black screen

Thank you all for the quick responses. Here are the pictures. The only board I am unfamiliar with is the black board to the left. I measured the voltages only that were printed on the power board that feed the main and they were on the dot.

Thank you so much

[budm]

Re: lg 32lk450 black screen

There are two column on that power supply board that goes to the main board.
You need to report the Voltage of each pin when TV is off and when power switch is activated to turn the TV on. Right now we have no idea what the control Voltages are.
Report in this format:
TV OFF/ON
PS-ON = XXX/YYY

BTW, the black board is Inverter board that produces about 1500 ~ 2000VAC to drive the CCFL.

You may want to read Basic LCD TV and Monitor troubleshooting guides to understand what the control Voltages are for.

[dick_barton]

Re: lg 32lk450 black screen

The second connector goes to the inverter board. The voltages on this connector would be useful as described above by budm.

[nomoresonys]

Re: lg 32lk450 black screen

One pretty easy check is, with tv UNPLUGGED from power, take the black cover off the long inverter board, look for the fuse should be labeled starting with F and test it for continuity to make sure it isn't blown. Be EXTRA CAREFUL specially when powered up, if you are working with or near that inverter board, that 1500-2000 volts Bud referred to can KILL instantly, there's some DEADLY voltages on the HOT/PRIMARY side of the powerboard too. Just a warning for anyone looking on that might not know.