i-sensys LBP7750cdn startup failure

[jaro74]

Hello,

maybe someone knowledgeable can point me in the right direction here:

My i-sensys LBP7750cdn won't start - it's trying to (making sounds of motors running for a few seconds) but then stalls whilst trying to boot, goes quiet and won't go any further.

By way of background it had not been used in years and it may be just dirty inside from the smog, but before I dismantle it, maybe there's a way to diagnose it?

Enclosed a picture at which with the progress during the start up procedure - can it be deduced from it what initial test it fails to stall and not boot up?

Thank you in advance for any suggestions.

[GIUBOSS]

Probable power supply failure , check if you see any faulty electrolytic capacitors

[MOLICN]

In this fault, first check whether the interface of the detachable main control board of the machine is corroded, you can try to clean the gold finger of the main control board first, and then test whether it can enter the system normally. Generally, the motherboard is broken, but some of them return to normal after cleaning the connector.