Consumer All-in-one screen backlight related voltage measurement manual V3.0

Knowledge Point Analysis:

Consumer All-in-one screen backlight related voltage measurement manual V3.0

Scope of application:

1. This manual is suitable for the host to add the Self-Test normal, but black screen, no backlight, backlight weak, screen flash type fault.

2. Some of the content is from the Knowledge base, thanks to the original author.

Operation Steps:

Measuring principle:

1. No TV model measuring board for Inverter power supply (can measure the motherboard to the inverter interface or inverter to the motherboard interface), inverter to screen power supply is normal to determine the cause of the screen backlight fault.

2. With the TV model measuring board to power the scalar board (can measure the motherboard to the scalar board interface and scalar board interface), scalar board to the inverter power supply (can be measured scalar board to the inverter interface or inverter to the scalar board interface), The inverter to the screen interface power supply is normal to determine the cause of the screen backlight fault.

Note:

Note:

1. The above interfaces are DC output (except CCFL LCD), the measurement is external use table Black pen grounding (the main body of the metal parts are grounded, such as: One machine inside the metal skeleton), Red pen one by one contact corresponding pin measurement.

2. Some models inverter and screen to match, and some models inverter matching screen to jumper. The inverter corresponding to different screen has different output voltage.

3. A600, some A700, some B300, some B305, B500, B505, B520_3d, C100, C200, C205, C300, C305, C315, the screen are all CCFL backlight, can not measure the inverter to the screen voltage.

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