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Old 12-13-2017, 01:18 PM   #1
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Join Date: Jan 2016
City & State: sheffield
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Default LG Plasma ZSUS Flashing Screen, No Booting! - 50PB690V

Replaced Zsus beginning of year as most transistors were short stopping tv powering up.

Now screen flashes on off continually and ZSUS ticks. Looking like replacement maybe faulty or could something else cause it to shut down.

If I remove both tabs from ZSUS to screen but keep all other connectors to ZSUS on then TV boots properly but screen very dark without ZSUS output, no ticking from ZSUS. So it only shuts down when under load from screen.

If it is ZSUS then how to fault find, I already looked for shorts. No transistors shorted or caps and its happy to stay on when not connected to screen and makes similiar quiet buzzing as YSUS which I think is normal?

All voltages on PSU and Y/Z SUS boards normal when screen not connected to ZSUS.

Please advise what I should test or how to test the various transistors on the ZSUS?

Control Board LED flashes normally when booting without screen attached to ZSUS and can run the test patterns.

Attached some pics, can do more if necessary.

ZSUS Board - EBR77256501.

Many thanks.
Attached Images
File Type: jpg IMG_0179[1].JPG (2.27 MB, 8 views)
File Type: jpg IMG_0180[1].JPG (2.09 MB, 6 views)
File Type: jpg IMG_0181[1].JPG (2.27 MB, 6 views)
File Type: jpg IMG_0182[1].JPG (2.06 MB, 4 views)
File Type: jpg IMG_0183[1].JPG (2.38 MB, 4 views)
File Type: jpg IMG_0184.JPG (2.27 MB, 4 views)
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