PCB board mounting hole locations wrong.

1) dislocation: PCB board electrodes and electrode not correspond screen, this time to analyze the cause of dislocation.
① PCB board mounting hole locations wrong.
② screen trimming inaccurate.
③ I assembled in the assembly due to problems caused by the way, then, to re-assemble.
④ shell alignment reference made inaccurate.
2) PCB board is bad, then the available test board and then measured again tooling plate, from the display outside interference may also cited confusion, then find out outside interference, can be excluded.
(2) shows uneven, shallow strip
In this case, you want to exclude him after careful analysis.
① a piece of display 5.7 TFT display module unevenness, but the wiring irregular. This is usually the reason screen, reassembled after replacement.
② a few display unevenness. In this case, generally zebra distorted, resulting in poor contact. After the need for demolition, the zebra flat, assembled again. If you can not be excluded, it is necessary to analyze other reasons, such as zebra high aspect ratio is inappropriate, improper compression ratio, conducting wide bandwidth inappropriate.
③PCB plate slightly Weld. Remove the PCB, the PCB post-test and re-assemble.
(3) lack of planning 7 TFT display module shows exclude:
1) PCB plate electrodes are contaminated, causing zebra poor contact.
2) zebra contamination, resulting in poor contact.
3) conducting electrode is contaminated, resulting in poor contact.
Just over three cleaning treatment, can be reassembled. When assembled, the site can not hand after touching the cleaning process.
4) PCB board break, Weld. Retest board a return, such as bad, for the board.
5) The screen electrode breakage or screen itself off, short circuit. The need to screen for reassembly.
6) The shell failed, after re-shedding assemble.
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