u/Aliexi

I bought a Cisco WS-C2960-48TT-L second hand for very cheap, but unfortunately the PSU is dead.

The fuse was blown, and after opening the PSU I found a burned 8-pin IC and another damaged component on the primary side.

So far I checked:

• No short across the main 400V capacitor
• Main MOSFET (Q1) does not appear shorted
• Damage seems localized around the controller/startup area

I’m trying to figure out:

• The PSU output voltages / pinout for the internal connector
• The function or part number of the burned 8-pin IC
• Whether this switch can run directly from an external PSU (for example 12V)

Wire colors on the PSU connector:

• 4 black
• 4 white
• 1 yellow
• 1 orange
• 1 purple
• 1 brown

I attached photos of the PSU, connector, and damaged area.

Any help would be greatly appreciated.

I bought a Cisco WS-C2960-48TT-L second hand for very cheap, but unfortunately the PSU is dead.

The fuse was blown, and after opening the PSU I found a burned 8-pin IC and another damaged component on the primary side.

So far I checked:

• No short across the main 400V capacitor
• Main MOSFET (Q1) does not appear shorted
• Damage seems localized around the controller/startup area

I’m trying to figure out:

• The PSU output voltages / pinout for the internal connector
• The function or part number of the burned 8-pin IC
• Whether this switch can run directly from an external PSU (for example 12V)

Wire colors on the PSU connector:

• 4 black
• 4 white
• 1 yellow
• 1 orange
• 1 purple
• 1 brown

I attached photos of the PSU, connector, and damaged area.

Any help would be greatly appreciated.

Hi everyone,

I bought a Cisco WS-C2960-48TT-L second hand for very cheap, but unfortunately the PSU is dead.

The fuse was blown, and after opening the PSU I found a burned 8-pin IC and another damaged component on the primary side.

So far I checked:

• No short across the main 400V capacitor
• Main MOSFET (Q1) does not appear shorted
• Damage seems localized around the controller/startup area

I’m trying to figure out:

• The PSU output voltages / pinout for the internal connector
• The function or part number of the burned 8-pin IC
• Whether this switch can run directly from an external PSU (for example 12V)

Wire colors on the PSU connector:

• 4 black
• 4 white
• 1 yellow
• 1 orange
• 1 purple
• 1 brown

I attached photos of the PSU, connector, and damaged area.

Any help would be greatly appreciated.

I bought a Cisco WS-C2960-48TT-L second hand for very cheap, but unfortunately the PSU is dead.

The fuse was blown, and after opening the PSU I found a burned 8-pin IC and another damaged component on the primary side.

So far I checked:

• No short across the main 400V capacitor
• Main MOSFET (Q1) does not appear shorted
• Damage seems localized around the controller/startup area

I’m trying to figure out:

• The PSU output voltages / pinout for the internal connector
• The function or part number of the burned 8-pin IC
• Whether this switch can run directly from an external PSU (for example 12V)

Wire colors on the PSU connector:

• 4 black
• 4 white
• 1 yellow
• 1 orange
• 1 purple
• 1 brown

I attached photos of the PSU, connector, and damaged area.

Any help would be greatly appreciated.