/diy/ - Do It Yourself

Anonymous Wed Aug 23 15:38:44 2023 No.2670729 [View]
File: 639 KB, 2310x1637, LCDPS.jpg [View same] [iqdb] [saucenao] [google]

LCD screen for large industrial machine is blank.
+5v and -22v rails are good, but the LC driving voltage (V0, ~+24v) is only +5v when powered on. Main board supplied with +5v and +12v from external PS, creates -22v on board, and +24v with pot between +5v and -22v rails.

Rather than find faulty component on main board, my thought is to cut trace for V0 at LCD and inject +24v from separate PS. Any reason this shouldn't work? In testing I'm seeing ~+10v at the logic pin VDD when disconnected from machine and +24v at V0.

Datasheet from LCD PS section attached.

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/diy/ - Do It Yourself

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