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LED 7-segment display stopped working

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First post, by CuPid

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hello,
I recently got a very nice AT case with a 2 digit LED display. The small PCB gets three inputs : +5V (and ground), the turbo light, and a single wire for the turbo light status (that plugs to the mainboard). It worked for a while, but after I tried to change the setting, it stopped working : the LEDs stay unlit, and the turbo light status is not updated with the mainboard information anymore 😵
I made sure that the +5V is well on the wires, and I also checked the display segments with a multimeter (I made the segments lit very lightly by pluggin the anode and the catode with a multimeter), just to make sure that it worked.

But now I'm dry, and I don't know what else I could check to figure out what is wrong 😢

Any suggestion would be very welcome. Thanks in advance !

I need a vacation.

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Reply 1 of 3, by wiretap

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Replace the two voltage regulators on the board. You'll have to remove the 7-segment display to desolder them.

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Circuit Board Repair Manuals

Reply 2 of 3, by CuPid

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I'll try that, thank you.

I need a vacation.

tbmtg3-99.png
zav4kj-99.png

Reply 3 of 3, by sf78

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wiretap wrote:

Replace the two voltage regulators on the board. You'll have to remove the 7-segment display to desolder them.

In this case I would just cut the legs and solder replacement parts to stubs. You can add more solder to the PCB part if you want to make sure there's a good connection.

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