N9912A FieldFox坏点：硬件故障或固件错误？

我刚刚在我的N9912A上安装了最新的固件（A.06.02）。
我正在观察频谱图显示，发现可能代表硬件故障的东西。
我在显示屏的右下角看到一块总共是黑色的8像素（4宽2高）。
我之前从未注意到这一点，并在固件升级后立即看到它，所以我很确定它刚刚发生。
经过一个小时左右的CAT，NA和SA模式，我发现在显示器中有扫描速度标签的所有情况下像素都“死”，而死像素总是在
相对于扫描速度标签的相同位置：距标签基线约1.25厘米，并且距显示器右边缘约2.5毫米。
即使在“分屏”频谱图显示中，死像素也始终遵循扫描速度标签。
我附加了三个屏幕截图来说明这些观察结果，第三个屏幕截图显示全屏模式下没有坏点（当显示屏上没有扫描速度标签时）。
为莫尔条纹道歉，但你会明白这一点。
这是显示内存故障还是固件错误？
我没有尝试降级回A.05.53以查看问题是否存在，但这可能是下一步。
斯坦



     以下为原文

  I just installed the latest firmware (A.06.02) on my N9912A. I was observing a spectrogram display and noticed something that may represent a hardware failure. I saw a block of eight pixels (4 wide by 2 high) in the lower right corner of the display that were always black. I had never noticed this before, and saw it right away after the firmware upgrade, so I'm pretty sure it just recently happened.
After an hour or so of playing around with the CAT, NA, and SA modes, I find that the pixels are "dead" in all those situations where there is a sweep speed label in the display, and the dead pixels are always in exactly the same position relative to the sweep speed label: about 1.25 cm above the baseline of the label, and inset about 2.5 mm from the right edge of the display. Even in the "split screen" spectrogram display, the dead pixels always follow the sweep speed label.
I've attached three screen shots that illustrate these observations, the third one showing no dead pixels in the full screen mode (when there is no sweep speed label on the display). Apologies for the moiré patterns, but you'll get the idea.
   

So is this a display memory failure or a firmware bug? I haven't tried downgrading back to A.05.53 to see if the problem follows, but that may be the next step.

Stan