Lg 60UF7300-UT Display Concern

[whiz62]

Picked this up today probably should have known better. Will show pic of screen when I got it home. Took back off and saw a red wire from the PSB disconnected as if it had been pulled out of the harness connector as the pin connector was still in the harness connector that goes to the T-Con. That pin connector is labeled SCLK, ( serial clock)? Anyway it made no difference when connected.

I know this TV has major concerns with the Main board. I have all the power board voltages and it fires right up and that is all she does. Got the 12 volts to the T-Con. Disconnected each ribbon cable to the LCD and they alternated from white on side and black on the other. Anyone have an idea on this?

[nomoresonys]

Re: Lg 60UF7300-UT Display Concern

Need better FOCUSED pics. of each board and one of the whole back as to see how they are all connected.

[whiz62]

Re: Lg 60UF7300-UT Display Concern

Nomoresonys, Hope these pics are good enough.

[nomoresonys]

Re: Lg 60UF7300-UT Display Concern

Check P201: Test the voltages at the connector on the powerboard with EVERYTHING hooked up, it's the connector that the cable from powerboard to mainboard hooks into, most times there's a legend/map nearby that gives the expected voltages, you measure them with your mutimeter, set meter to 20 vdc then report them, put neg probe on chassis metal ground, pos probe on pin of connector, measure in standby take note, leave probes where they are then power on tv and again take note of voltages, report them here, example pin 1-ps-on-0 volts standby-power on-3.3 volts.

[dick_barton]

Re: Lg 60UF7300-UT Display Concern

Where is the red/pink wire connected to in your first photo of the power supply?

[Davi.p]

Re: Lg 60UF7300-UT Display Concern

check white fuse on tcon.

[dick_barton]

Re: Lg 60UF7300-UT Display Concern

Where is the red/pink wire connected to in your first photo of the power supply?

missed out "going"

[whiz62]

Re: Lg 60UF7300-UT Display Concern

Where is the red/pink wire connected to in your first photo of the power supply?

It appears it goes to sclk pin which is second from from top because there is a connector pin still in the plug connector.

[whiz62]

Re: Lg 60UF7300-UT Display Concern

check white fuse on tcon.

Fuse good, 12v on both sides.

[Davi.p]

Re: Lg 60UF7300-UT Display Concern

sorry you already told it.. seen the hands already put in i suspect wrong mainboard model..

[whiz62]

Re: Lg 60UF7300-UT Display Concern

Check P201: Test the voltages at the connector on the powerboard with EVERYTHING hooked up, it's the connector that the cable from powerboard to mainboard hooks into, most times there's a legend/map nearby that gives the expected voltages, you measure them with your mutimeter, set meter to 20 vdc then report them, put neg probe on chassis metal ground, pos probe on pin of connector, measure in standby take note, leave probes where they are then power on tv and again take note of voltages, report them here, example pin 1-ps-on-0 volts standby-power on-3.3 volts.

With TV plugged in not turned on: With TV turned on:
Sin=0v Sin=.043v
Sclk=0v Sclk=.029v
Gnd=v Gnd=.004v
24v=0v 24v=25.02v
24v=0v 24v=25.02v
Gnd=0v Gnd=.004v
12v=0v 12v=11.82v
12v=0v 12v=11.82v
12v=0v 12v=11.82v
Gnd=0v Gnd=.004v
3.5v=3.5v 3.5v=3.5v
3.5v=3.5v 3.5v=3.5v
P-Dim=.005v P-Dim=2.639v
Pwr_on=0v Pwr_on=3.530v
vsync=0v vsync=.018v
Gnd=0v Gnd=0v
N.C.=0v N.C.=0v
Gnd=0v Gnd=.003v
24v=0v 24v=25.01v
24v=0v 24v=25.01v
Gnd=0v Gnd=.003V
12v=0v 12v=11.82v
12v=0v 12v=11.82v
Gnd=0v Gnd=.004v
3.5v=3.5v 3.5v=3.5v
Gnd=0v Gnd=.004v
P-Dim2=.005v P-Dim2=1.718v
Drv_on=.002v Drv_on=3.487v

[nomoresonys]

Re: Lg 60UF7300-UT Display Concern

What all sources have you tried hdmi, rca, over the air antenna?

[whiz62]

Re: Lg 60UF7300-UT Display Concern

What all sources have you tried hdmi, rca, over the air antenna?

I can't get anything on screen but the 10" wide white strip in the middle of the screen and black top and bottom. Remote only turns unit on and off.