Hi,
I'm new to fixing TVs. I usually just stick to computers. I have an LG 42lk450-UB. It got hit with a power surge. The red standby light comes on when plugged in and when powered on it will flash twice and then turn blue. I get no picture and no sound. The backlights do not come on at all and I cannot see a picture when shining a light on the screen. I checked the caps with an ESR meter and they are fine. The two large caps (82uf 450v) are bigger than what I normally deal with so I don't know the specs on them. I got a .22 on the ESR and in standby 168v and powered on 388v. I checked both fuses on the power board and the one on the t-con board. I measured all the voltages at the connection between the power board and the main board.
12v – 12.3 Err - .07
12v – 12.3 P-dim - .01
12v – 12.3 A-dim – 2.91
3.5v – 3.4 Inv on/off – 0.3
3.5v – 3.4 3.5v – 3.4
20v – 21.6 3.5v – 3.4
Power on – 3.2 20v – 21.6
20v – 21.6
Not sure what to test next. Thanks.
I'm new to fixing TVs. I usually just stick to computers. I have an LG 42lk450-UB. It got hit with a power surge. The red standby light comes on when plugged in and when powered on it will flash twice and then turn blue. I get no picture and no sound. The backlights do not come on at all and I cannot see a picture when shining a light on the screen. I checked the caps with an ESR meter and they are fine. The two large caps (82uf 450v) are bigger than what I normally deal with so I don't know the specs on them. I got a .22 on the ESR and in standby 168v and powered on 388v. I checked both fuses on the power board and the one on the t-con board. I measured all the voltages at the connection between the power board and the main board.
12v – 12.3 Err - .07
12v – 12.3 P-dim - .01
12v – 12.3 A-dim – 2.91
3.5v – 3.4 Inv on/off – 0.3
3.5v – 3.4 3.5v – 3.4
20v – 21.6 3.5v – 3.4
Power on – 3.2 20v – 21.6
20v – 21.6
Not sure what to test next. Thanks.
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