I have an LG 42LC2D tv that recently lost picture. When I turn the unit on I get a click, the red standby light blinks green 12-14 times and then turns solid. When I press the power button, it takes several seconds to turn off. I have replaced several caps including one visibly blown one. The unit is still not working. I started disconnecting wiring harnesses. When I disconnect the 13 pin harness, the unit will power on correctly, but still no picture. With the set still on, I reconnected the harness and I have video. The pictures included have the harness I am talking about circled. Any ideas? Thanks in advance.
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LG 42LC2D no picture
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Re: LG 42LC2D no picture
I took these readings this afternoon. The second 5V pin was steadily dropping. When I first took the reading, it was showing almost 1.5v.
AC DET - OL
RL ON - 1.85v
ST 5V - OL
GND - 0
INV ON/OFF - .012v
5V MNT - .072 dropping
POL/INV - 1.112v
ST 5V - OL
GND - 0
PWM - .118v
6.0 V - OL
GND - 0
LIVE ON - 1.476v
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Re: LG 42LC2D no picture
Originally posted by bestjm View PostI took these readings this afternoon. The second 5V pin was steadily dropping. When I first took the reading, it was showing almost 1.5v.
AC DET - OL
RL ON - 1.85v
ST 5V - OL
GND - 0
INV ON/OFF - .012v
5V MNT - .072 dropping
POL/INV - 1.112v
ST 5V - OL
GND - 0
PWM - .118v
6.0 V - OL
GND - 0
LIVE ON - 1.476v
Right now you are saying you do not have pictures, which you will not see the pictures because the Blacklights are not on for you to be able to see the image on the screen because the main board is not sending the INVERTER ON (BL-ON) signal.Last edited by budm; 05-20-2017, 03:58 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: LG 42LC2D no picture
Sorry. I must have had the range too low.
AC DET - 0v
RL ON - 1.85v
ST 5V - 4.98v
GND - 0
INV ON/OFF - 0
5V MNT - .08v
POL/INV - 1.112v
ST 5V - 4.96v
GND - 0
PWM - .10v
6.0 V - 6.13v
GND - 0
LIVE ON - 1.476v
It looks like the inverter power supply voltages are all above 24v. Thanks for your help.Last edited by bestjm; 05-20-2017, 08:10 PM.
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