LG 42PG60UD - Clicking & cycling on/off

[Amraks]

Hey guys

Model: LG 42PG60UD
PSU: LPX54
Mainboard: 60PG30UD-AA

Have disconnected the Y-sus and The Z-Sus. The symptoms are still there.
So I figure its not the Y-sus or Z-sus.

It cycles about 4 times then stays on with a faint picture.
Remote won't change the channel or turn tv off. the remote does make the led blink as if its communicating with TV.

If anyone can help that will be great.

I have attached a photo I found of the same PSU.
as I haven't got my parents camera at the moment.

Readings I have.

VS: 181v
VS: 181v
VA: 59v
VA: 59v

It's writting on the tv what these should be
VS :187
VA:60

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

Just disconnected mainboard and shorted the Auto_gen now I have a test picture.
So this could mean a faulty main board?

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

That would make sense.
Is this an LG plasma, with a Samsung power supply?!

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

Yes its a samsung psu

Yes its a LG plasma

Why do you ask?

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

Well, it's unexpected. It's the first I've seen like that. I rarely see any Samsung parts in LG sets and vice versa -- I think the companies being such fierce competitors rarely buy from each other.

It does seem like your main board is at fault.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

yeah its uncommon lol.
I think I have figured out why though, I rang LG and got the number for statewide they are LG spare parts, Samsung Parts and Panasonic Parts.
http://www.statewideapp.com.au

So get a new main board?
or try find the fault?

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

5v_det: 4.7v
av_det 4.6v

not sure if these mean anything.
should they be reading 5v?

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

Those both appear to be OK.
You can check LDOs, switching regulators, etc.
Also, if you can, try checking the RS232 output and see if a message is output.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

what message output will it be?

Will it be along the lines of the software loading?

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

I don't know, I've never tried, but there may be -something- on the output.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

Ok got the readings for the voltage regulators.

IC1003
EH16A
819F25
1. 0.00
2. 3.27
3. 5.05

IC803
6F
B26
1. 3.27
2. 0.00
3. 3.25

IC1004
EH13A
825F07
1. 0.00
2. 1.78
3. 3.30


Are these fine?

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

#2 probably isn't a regulator. Others are fine.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

I thought that much

I wasn't sure as it was my first time testing this kinda stuff.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

LDO's next?

Not sure what these look like.

Thanks heaps for helping me you are always helping around here.

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

LDOs = low drop out regulator, same as regulator, different name.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

ok so I have done these hmm whats next

[tom66]

Re: LG 42PG60UD - Clicking & cycling on/off

Can you post an image of the main board?

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

not the best photos but what can you do when you don't own a good camera.
I thought I would throw in 3 for good luck.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

Hey not sure if this helps but its the mainboard diagram.

[Amraks]

Re: LG 42PG60UD - Clicking & cycling on/off

should I take a gamble and recap a few caps on the psu?

or just buy a new mainboard?