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LG 42 PN4500 abnormal picture

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P.R.Gore:
Hi,
LG plasma tv ; model number 42PN4500 is showing picture with enormous number of black spots or say patches. All voltages that mentioned on panel steaker seem normal.(Vsus & Vad ). Please observe attached photos & suggest solution.
Regards
P R Gore

downunder:

Looks like a faulty Z-Sus to me.

You could disconnect the flexi from the main board to the control board (under the PSU). At probably around 4 o'clock position on the big chip on the control, you should find the auto gen test points - could be marked R51/R52. Short these out and check the test patterns. If OK, main board is faulty.
If not, probably Z-Sus.                       Bruce

P.R.Gore:
 Bruce,
As per your suggestion I connected jumper, the same fault appears in test pattern also. So fault should be in Zsus board. Can Zsus be repaired at component level ? Any repair hint?
Thank you very much for this repair suggestion! Waiting for your further reply.
P R Gore.

downunder:

 No specifics, just to check FETs and Diodes for shorts and dry joints.     - Bruce

P.R.Gore:
Ok. I will check & update.
Thanks.

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