Lg 60pn5000-ua

[ingsting]

When this set was brought to me, it would not turn on. I replaced the main board and plugged the set in, it then immediately came on after the relay on the power supply clicked. There was an orange banner (please tell me what this is if you know) across the top of the screen that said something about power but due to my excitement that the set was on I ignored it and moved on to trying to change the inputs. I didn't have the remote so I was using the keypad on the left side of the set to select volume, channel, etc...each time I selected an input it highlighted and I was unable to "un" highlight them. I turned the set off thinking that would reset the selected inputs but when I turned it on again I got nothing but an all white screen (BTW it was an all white screen when the orange banner was onscreen too).

The Tcon flashes one long one short twice before repeating the code.
The VS voltage is 203.
The VA voltage if 55.
The 15V that goes from the Zsus to the Ysus is 17.87

Please help!

[dick_barton]

Re: Lg 60pn5000-ua

It would be helpful to post pictures. You say what Va and Vs are but not if they agree with the voltages given on the panel sticker.

You could try and run the Ext_Auto_Gen by disconnecting the ribbon cable to the mainboard and bridging the two holes under R651 & R652 and see if you have the test patterns displayed.

[ingsting]

Re: Lg 60pn5000-ua

Yes, the Va and Vs do match what is on the label on the panel. As to pictures, there is nothing to show but a white screen. I did disconnect the ribbon cable to the mainboard and got a black screen. Jumpered R651 and R652 on the Tcon but got nothing other than the black screen I already had.

[dick_barton]

Re: Lg 60pn5000-ua

Check the voltages as given in the following post

https://www.badcaps.net/forum/showth...ht=60pn5000-ua

[ingsting]

Re: Lg 60pn5000-ua

VS = 203.2
VA = 55.06
VSB = 115.8
VSC = 149.4
PS_On = 5.133

[dick_barton]

Re: Lg 60pn5000-ua

Yes, the Va and Vs do match what is on the label on the panel. As to pictures, there is nothing to show but a white screen. I did disconnect the ribbon cable to the mainboard and got a black screen. Jumpered R651 and R652 on the Tcon but got nothing other than the black screen I already had.

At what rate (on/off) is the led blinking on the control board. The one with the pins you jumped.

[Andrew F. Ali]

Re: Lg 60pn5000-ua

This is a PLASMA TV therefore there will no T-CON Bd......

[ingsting]

Re: Lg 60pn5000-ua

@Andrew F. Ali - There is a Tcon

Dick, the flash is long (slow) short (fast) long short, it does this twice then repeats.

[Andrew F. Ali]

Re: Lg 60pn5000-ua

Hmmm....must be a new design I am unaware of in my 45yrs of electronics. That would be the LOGIC CONTROL Bd and NOT a T-CON Bd. T-CON Bds are associated with LCD TVs, my friend.

[ingsting]

Re: Lg 60pn5000-ua

Point taken...now that we have that established, do you have any ideas drawn from your extensive experience that will help troubleshoot the problem?

[dick_barton]

Re: Lg 60pn5000-ua

So all the voltages match what's given on the panel. Disconnecting the cable from the control board to the mainboard and jumping the EXT_AUT_GEN does not display a picture. However, while running that test is the screen still white and does the power stay on while testing.
If so it may well be the control board needing to be replaced.

[ingsting]

Re: Lg 60pn5000-ua

The screen is black when the ribbon cable from the "logic board" to the main board is disconnected. When running the test the screen is black. The power does stay on while testing.

[tvtimmy]

Re: Lg 60pn5000-ua

I would try the $12 logic control board from shopjimmy or find a cheaper one on e bay.

[ingsting]

Re: Lg 60pn5000-ua

Thank you tvtimmy, did that already and got the same results.

[diif]

Re: Lg 60pn5000-ua

Thank you tvtimmy, did that already and got the same results.

Since post #1 ?

[ingsting]

Re: Lg 60pn5000-ua

yes, actually before post 1.

[tvtimmy]

Re: Lg 60pn5000-ua

Maybe you got a dud.