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11 hours ago, Kiranbhowan said:

Please can anybody advice why the axpert inverter 5kw lcd screen does not come on , it a new installed inverter it connected to 4 x 200 ah agm batteries  , when it is powered on the lcd screen is blank please advice 

There is a cable from the main board to the LC Display; that that is loose, come off, of forgot to be put back, that would cause a lack of LCD backlight. But you say it's a new inverter; correcting or even checking this could void the warranty.

Do the LEDs come on with the brief "lamp test" at start-up? Any sound at all?

The other possibility is a catastrophic hardware failure, e.g. damaged main power supply, 200 A fuse blown, etc. None of these are likely on a brand new install. Are you sure that 48 V+ is getting to the battery terminals? Could be a missing / faulty fuse, wiring, etc.

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