Re: LG 42" Plasma Colored Vertical Lines and No Video, No Menus

Hi Wizard and All,

I am approaching wits end! You are right, the PS is OK, confirmed by swapping another (trial avail. at no cost, fortunately). I also swapped another LVDS main logic board with no change in the symptoms. Please note that I have not changed the LVDS CABLE as you may have thought, and I have not suspected the cable itself since it is mainly a mechanical part, and the failure mode was sudden.

However, when I unplug the LVDS cable between the main logic board to the...

Re: LG 42" Plasma Colored Vertical Lines and No Video, No Menus

Hi Wizard - thank you, I will replace the PS and report back. I swapped main boards already and the same exact symptom persisted, so hopefully that means it comes down to the PS.

Cheers,
Michael

Re: LG 42" Plasma Colored Vertical Lines and No Video, No Menus

Hi PlainBill - please do not incur any marital wrath over my LG plasma problem - LOL. Yes, anyone reading this forum knows of Wizard. I offered Wizard a note inviting him to visit this thread and to opine, so awaiting his expert input. Maybe you can let him know he is really needed here

Thank you again for your all your help to date. I am really stumped. Since the screen is bright with some video behind a bright random pinstripe image, I tend to infer the power supply and the panel must be good?...

Hi Wizard - hoping you might take a look and opine on this thread involving a stubborn LG 42 plasma problem:
[url]https://www.badcaps.net/forum/showthread.php?t=10777&goto=newpost[/url]
Thank you in advance, Michaelhttps://Hi Wizard - hoping you might...vance, MichaelHi Wizard - hoping you might take a look and opine on this thread involving a stubborn LG 42 plasma problem:
[url]https://www.badcaps.net/forum/showthread.php?t=10777&goto=newpost[/url]

Re: LG 42" Plasma Colored Vertical Lines and No Video, No Menus

Hi Bill, here are some results for your consideration and advice if you please:

The panel label is:
PDP42X2
Va: 60 Vs:200
80 / -200 / 120 /NA / 90

So, following are the (spec) voltages, the actual measured voltage, and V adjusted in some cases:
(12) = 11.9
(3.4) = 3.318 adj to 3.39
(5.0) = 5.1
(6.0) = 5.93
(19) = 18.81
Va (60) = 60.9
Vs(200) = 185 at power supply, unable to adjust up to min. spec of 195 using PS potentiometer....

Re: LG 42" Plasma Colored Vertical Lines and No Video, No Menus

Hi PlainBill - thank you for your advice. I have reviewed the available manuals. From the symptoms I think the voltages are OK and will confirm that. Another clue: maybe narrowed down to the Main LVDS board OR the Controller board, since if I disconnect the signal cable between these 2 boards (set unpowered) the colored vertical lines across the display do not appear and the plasma display still primes (comes on blank) upon power up. Also, this was a sudden one way failure i.e. not time or heat related, so I suspect...

Hi - see attached photo of LG model DU-42PX12X with vertical pinstripe lines across the full screen changing colors. No video, so no access to menus, so unable to test if sound works.

Can anyone tell from the attached picture if this is most likely caused by which faulty board:
* Ysus
* Zsus
* Control board
* LVDS board
* or some other most likely cause?

Fuses, caps, driver chips appear good and no signs of distress in the set.
I infer that that the slab panel is good from the bright full screen consistent picture, the driver...