H10: device evaluation: the device was returned for investigation.A visual inspection and functional test were performed.Visual inspection did found the tamper seal was removed.The reported complaint was confirmed and verified after power on the returned 8400 monitor and there was a missing segment on the lcd.There was also a crack found on the lens at the bottom center.Opened the monitor, found the c02 pump shifted out of position.Due to all the damage found on the device, this was determined by impact to the monitor.The c02 pump and speaker connection on the main board was swapped.The tamper sticker was removed.The on/off switch was intermittently working.The lcd, lens and keypad were replaced.The root cause was established to be determined by the user interface and interaction with the device.The missing pixel lines and cracked lcd lens are consistent with unit being physically impacted.The protective boot around the housing acts as shock absorber preventing damage to the housing, however pressure to the display and centrifugal forces in the time of impact affects pixels alignment in the lcd grid are known for resulting in pixels damage.Operation manual warned at its chapter 1 and 3 in the warning section as follow -any monitor that has been dropped or damaged, should be inspected by qualified service personnel, prior to use, to insure proper operation.- first time in for service after 5 years in the field and the failure resulted from a combination of physical impact to the monitor and malfunctioning keypad.The dhr review is not applicable or relevant because the results of the complaint investigation do not indicate a problem with the initial manufacture or prior repair of the device.
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