Acer HARLEY TAB A3-A20 Service Manual page 78

6.3 Back Light----Back Light Test
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Click on this test item, the levels of back light brightness in turn as shown: 1.00.750.50.25.
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Check whether the back light weakens in turn by visual inspection.
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Check whether pass or not by visual inspection.
After the test is done, click on ―Pass‖ or ―Fail‖ button to exit the test. Test result will be automatically
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written into ―/sdcard/Factory/Diagnostic/ _TestResult.txt‖.
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Test result interface as below.