(2) HP Laserjet M428fdw's with black user screens

[JtechC]

Hello,

I have two HP Laserjet M428fdw's from different customers with black user screens. I've replaced the screens and the formatters with the same black screen result. The customers don't want to keep sinking money into parts if they won't fix the problem.
The printers power up and sound like they are running their POST test.

Has anyone experienced this before?
Is it the LVPS or HVPS?

Any help would be appreciated.

Thanks.

Jeff

[wav]

Re: (2) HP Laserjet M428fdw's with black user screens

hi,
i have had this issue be for the screen controller board is faulty - replace the LCD panel and it works
Display Screen For HP M428fdn M428fdw M429dw M429fdn M429fdw M428 M429 428 429 Control Panel Assembly Touchscreen - AliExpress

[JtechC]

Re: (2) HP Laserjet M428fdw's with black user screens

I have already replaced them and the formatters with no luck.

[wav]

Re: (2) HP Laserjet M428fdw's with black user screens

I have already replaced them and the formatters with no luck.

My only other suggestion is see if the ribbon cables are Bent or get a multi meter and go each end and see if it beeps if it does there's no cracked or damage traces on the cable.


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