Gunitronics Posted September 7, 2019 Report Share Posted September 7, 2019 Hi, I have a mostly functional v570 that I would like to refurbish to build a demo machine. Unfortunately, the LCD ccfl backlight inverter is shot and the screen does not turn on but the rest of the PLC is fully functional - which I confirmed by connecting over COM1, updating the OS, downloading a new project, monitoring/controlling registers/IOs, reading touch coordinates/toggling the onboard buzzer, etc). I am very interested in ideas how any of you were able to resurrect dead LCDs. (This is not a question about the boot / blank screen issue, I know how to recover from that. This is a hardware issue with a bad ccfl backlight inverter (or bad LCD). and/or If any of you happen to have a functional v570 CCFL backlight inverter (hitachi invc695) or an LED backlit LCD/driver combo and willing to donate or exchange it for a fully functional V120-22-UN2 model, please let me know. Thanks Quote Link to comment Share on other sites More sharing options...
AlexUT Posted September 8, 2019 Report Share Posted September 8, 2019 Are you sure CCFL inverter is working? LCD and CCFL are combined in one module, so it is better to replace both. Before you are looking for LCD+CCFL assembly, check inverter with other LCD. B.R. Quote Link to comment Share on other sites More sharing options...
Gunitronics Posted September 9, 2019 Author Report Share Posted September 9, 2019 In case someone else runs in the same situation: I ended up testing the I/O voltages of the inverter, input was ok at ~5VDC, but there was no high voltage output. As a secondary test, I hooked up the input of the CCFL backlight to the inverter of an "old" laptop LCD... and the PLC screen came back to life ! Since the original hitachi invc695 seems to be obsolete (and overpriced $100-$300), I ended up buying a "universal"/laptop ccfl inverter for <$10. Should be a smooth sail from here: some hand soldering then securing the universal inverter (no mounting holes on the pcb). Quote Link to comment Share on other sites More sharing options...
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