LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

[stephenc]

This 7 year old TV is like new, but sadly doesn't work at all. Just to be clear, there is absolutely no sign of power.

It just would not switch on one day. I moved it about and it came on but then went off.

I replaced the power cable and even removed the back to ensure there was life going to the power supply (which there is) but am frightened to go any further.

Any advice on next step would be greatly appreciated.

With some research, I found a manual at http://elektrotanya.com/?q=showresul...oria=&kat2=all

[ReeceyBurger123]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Do you have standby Led ?

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

How about uploading good clear pictures so we will know what we are dealing with?

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Do you have standby Led ?

Actually I'd forgotton that if you tap it hard on a work bench (which I've just done) you can get the power LED to come on, but as you move it around it goes off again and you have to give it another sharp tap or bang.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Actually I'd forgotton that if you tap it hard on a work bench (which I've just done) you can get the power LED to come on, but as you move it around it goes off again and you have to give it another sharp tap or bang.

Bad connections, bad mounting screws for the circuit board grounding, bad connection on the connectors, etc. you will need to do really good visual inspection.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

images attached - even when there is no sign of power and the LED light won't come on there is still 240V on either side of the fuse as shown.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

OK.
1) The connectors of the power supply have labels for each pin to tell us what they are, you need to check the DCV of each pin to see if any of them has any DCV on them.
You will need to report the readings and you MUST pin the pin number and pin names AFTER each pin so we can see what is present and what is not present.

2) What is the power supply board P/N as shown on the barcode sticker?

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

OK.
1) The connectors of the power supply have labels for each pin to tell us what they are, you need to check the DCV of each pin to see if any of them has any DCV on them.
You will need to report the readings and you MUST pin the pin number and pin names AFTER each pin so we can see what is present and what is not present.

I'm not sure I fully understand this? Is DCV the DC voltage across the connector block? Do I just stick the probes up the connector block? If so, should I set the multimeter to DC which seems odd as it's 240V AC.

By the way, I've checked and there is full continuity from the pins right back to the plug which goes into the wall socket.

2) What is the power supply board P/N as shown on the barcode sticker?

The part number looks like B791B330585010904 and I've tried to attach an image of it.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Not sure if this is what you have asked for but the blue negative cable has a label with E13933B (or maybe the B is an 8). There is NO AC voltage between it and earth chassis.

The red live cable has a label with 600V FT1 22AWG and it has 232V AC between the terminal and earth chassis.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Anyone any suggestions where I go from here please?

[Rickig]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

I think what budm is asking is next to the white connectors on the top right of the power supply is writing (printed on the board) which tells you what each pin does.
What are those? Ie top pin (1) =
And so on

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Apologies for confusion. I have now attached an image of the pins for the 2 connector blocks. Their details are below -

1 AOC - 5.09
2 ON/OFF - 0
3 ST 5V - 5.09
4 GND - 0
5 I-C - 0
6 ERR - 0
7 I-B - 0
8 ST 5V - 5.09
9 GND - 0
10 DIM - 0
11 6V - 6.08
12 GND - 0
13 ???? - 0

1 19V - 18.47
2 19V - 18.44
3 GND - 0
4 GND - 0
5 6V - 5.95
6 GND - 0
7 3.4 - 0
8 GND - 0
9 12V - 11.82
10 GND - 0

To take these DC voltage readings, I removed the connector blocks from the board and connected the probes between the earth chassis and each pin in turn.

Pin 7 on the second block should I assume have a 3.4V but has 0

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Just to follow up on earlier posts -

1 There definitely seems to be a bad connection somewhere as I can easily get it to come on and off by a sharp tap on the worktop.

2 When it comes on, there is 3.4V from Pin 7

Should I assume it is definitely in the power board and order a new one??

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

OK, you need to have all the connectors in place and then take the readings again because the main board sends some command signals to the power supply board and the backlights circuit. So far you do have STANDBY Voltage.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

OK thanks budm, I've now taken another 2 sets of readings -

1 With the power connected but the TV in the fault state.

1 AOC - 4.5
2 ON/OFF - 0.04
3 ST 5V - 4.5
4 GND - 0
5 I-C - 0.03
6 ERR - 0
7 I-B - 0
8 ST 5V - 4.5
9 GND - 0
10 DIM - 0
11 6V - 0.01
12 GND - 0
13 ???? - 0.04

1 19V - 0
2 19V - 0
3 GND - 0
4 GND - 0
5 6V - 0.1
6 GND - 0
7 3.4 - 0.05
8 GND - 0
9 12V - 0
10 GND - 0

2 With the power connected, TV knocked on the bench and the pilot light on.

1 AOC - 5.04
2 ON/OFF - 2.8
3 ST 5V - 4.98
4 GND - 0
5 I-C - 4.93
6 ERR - 0
7 I-B - 0
8 ST 5V - 4.98
9 GND - 0
10 DIM - 0.44
11 6V - 6.33
12 GND - 0
13 ???? - 0.04

1 19V - 18.51
2 19V - 18.51
3 GND - 0
4 GND - 0
5 6V - 6.34
6 GND - 0
7 3.4 - 3.43
8 GND - 0
9 12V - 12.35
10 GND - 0

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

Anybody any thoughts on the next step please?

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

https://www.badcaps.net/forum/attach...8&d=1444936903
What is that hanging red wire from the inverter board?
So you do have pilot lights, one signal that does not look right to me is the:
10 DIM - 0.44 which looks to be too low for the backlights Dimming signal.
BTW: 1 AOC - 5.04 is actually ADC (AC DETECT signal).

Your Voltage readings looks normal except the DIm pin 10.

[stephenc]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

https://www.badcaps.net/forum/attach...8&d=1444936903
What is that hanging red wire from the inverter board?

There is both a red and a black wire suspended neither of which look as if they have ever been connected.

The part number looks like B791B330585010904 and I tried to attach an image of it in an earlier post.

[budm]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

There is both a red and a black wire suspended neither of which look as if they have ever been connected.

The part number looks like B791B330585010904 and I tried to attach an image of it in an earlier post.

Sorry, I found the board on SHOPJIMMY.
Those wires should not be floating around like that, need to find which pins on the inverter connector they are connected to. Did any one else work on this TV before you?

[vinceroger69]

Re: LG 32LC46 Model 32LC46-ZC not turning on or showing any sign of life.

in this thread post 14 first picture it shows the red and black wires connected? are these connected on your set
https://www.badcaps.net/forum/showth...ight=LG+32LC46
can you post a clear picture ot that connector on your set?