LG Plasma 50PA5500

[tom66]

Re: LG Plasma 50PA5500

OK, try to use the EBT number when ordering. Avoid using EAX number as compatibility issues could exist.

[dyel]

Re: LG Plasma 50PA5500

I followed "Test_2", the same:
- Click by click from power board;
- black screen.

[tom66]

Re: LG Plasma 50PA5500

OK, can you show me how you have set up the resistors?

Does the screen glow, visible in a dark room?

Next step will be isolation of the circuit boards.

[dyel]

Re: LG Plasma 50PA5500

>>OK, can you show me how you have set up the resistors?
Please see the files.

>>Does the screen glow, visible in a dark room?
Right now it's not dark, but i'm sure that there wasn't any glow.

>>Next step will be isolation of the circuit boards.
Need to see in the picture

[dyel]

Re: LG Plasma 50PA5500

Have I set up the resistors correctly?

[tom66]

Re: LG Plasma 50PA5500

They appear correct. At this point you will need a digital multimeter, do you have one?

[dyel]

Re: LG Plasma 50PA5500

No, I don't. But seems that I can buy it.
What to check with it?

[tom66]

Re: LG Plasma 50PA5500

You can check the VS and VA high voltage to see if the power supply is working or not.
A basic digital multimeter, available for less than $10 from good shops, will do well.

[Dabbi]

Re: LG Plasma 50PA5500

hm..okay so I got the new main board and put it in. connected everything back plugged it in and it started cycling through the test pattern. I thought well that's odd so I redid the step you had me do earlier minus the bridging And it still went through the test pattern. Only now I have white noise with the pattern where as I didn't before

[tom66]

Re: LG Plasma 50PA5500

hm..okay so I got the new main board and put it in. connected everything back plugged it in and it started cycling through the test pattern. I thought well that's odd so I redid the step you had me do earlier minus the bridging And it still went through the test pattern. Only now I have white noise with the pattern where as I didn't before

Check under the control board to make sure you have no stray conductor/wire (holes on EXT AUTO GEN need be open), and make sure the cable between the main board and control board is correctly connected.

[Dabbi]

Re: LG Plasma 50PA5500

I dbl checked all that and I can't find anything that seems to be wrong....I even put the old board back in and without the jump it still does the test pattern too. only without sound.

[tom66]

Re: LG Plasma 50PA5500

Well, that is very unusual. Nothing under the board at all? Any scratching or contamination between the holes you bridged?

[Dabbi]

Re: LG Plasma 50PA5500

not any that i could tell. I took the board off and looked it over carefully.

[tom66]

Re: LG Plasma 50PA5500

It could be a bad control board, but I have never seen this symptom before...

[Dabbi]

Re: LG Plasma 50PA5500

yay for me finding a first.

[tom66]

Re: LG Plasma 50PA5500

One final thing to try, hold MENU on set and MENU on remote for 10 seconds do you see a menu prompting for password? If so enter 1234 or 0000 and see if you can turn off a test pattern option, if not a control board may be the only way to fix it.

[dyel]

Re: LG Plasma 50PA5500

You can check the VS and VA high voltage to see if the power supply is working or not.
A basic digital multimeter, available for less than $10 from good shops, will do well.

I got a multimeter. Could you draw in the picture, where should i put the negative and positive lead to check VS and VA?

[capkid]

Re: LG Plasma 50PA5500

In the upper-right hand corner, there are two jumper wires labeled "VS TP" and "VA TP". Place your positive lead on each of those, respectively, and place your negative lead on a metal part of the TV chassis.

Edit: I didn't realize that Tom was still online. Kind of late for you, Tom

[tom66]

Re: LG Plasma 50PA5500

I have absolutely no problem with someone else diving in to help. That IS the point of a tech support forum... . Only 10pm here.

[dyel]

Re: LG Plasma 50PA5500

Thanks!
I got the numbers.
The meter was set to DC voltage = 20V - VS was shifted from 5.4 - 6.3
VA was between 5.0-7.0 with DC voltage = 200mV.
So, what the numbers mean?