During the incoming inspection in tsc, system error occurred with abnormal noise, and the system shut down.Once rebooted, the display doesn't boot up and a bad smell occurs.Ic of keypad controller pcb has burned out.
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The service technician at the (b)(4) office replaced the assay display cs300 (part numb 0997-00-0524), overlay main keypad (b)(4) (part numb 0330-00-0039-06), label, main display, (b)(4) (part numb 0334-00-1638-06) on (b)(4) 2012.The unit was tested and functioned as expected.The replaced components were returned to (b)(4).The complaint of 'a system error occurred with abnormal noise, and the system shut down; once rebooted, the display doesn't boot and a bad smell occurs' was reproductible.Ic of keypad controller pcb has burned out.The c28 on the 0670-00-1145 keypad controller board had burnt up.Ths was the cause of the bad smell.In addition, component d4 was shorted.These components are part of the +12v supply that operated dc/ac inverter for the display.C28 probably shorted out which caused d4 to short out shutting down the +12v.A root cause of the component failure cannot be determined because c28 was so badly damaged.A new keypad controller was installed into the display head assembly and was powered up for one week with no problem, which indicates that no other components in the display head caused the keypad controller to fail.(b)(4).
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