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Audio Video System Connection Troubleshooting

Table of Contents

Improvement instructions on the burning of the input and output chips caused by improper connection to the ground in the video system


Solution:


1.1. The simplest solution: the LCD splicing screen has more than one input port. Connect any signal input port of all LCD splicing screens with the corresponding cable (not Regardless of whether it is HDMI, DVI, or VGA, it can be used). Connect the metal shell at the port of this cable to the ground, or the ground pin of the power strip (please Make sure the ground pin of the socket is indeed connected to the ground).


1.2. It can be connected to the mounting hole of the LCD splicing screen shelf (make sure there is continuity here, not insulating paint)


1.3. If it is a standard construction, the LCD splicing screen should have a ground wire buried here. Please connect the ground of this input cable of all splicing screens to this ground wire.


1.4. If there is no buried ground wire, please connect the ground of this input cable of all splicing screens to the ground pin of the AC power strip (please ensure that this ground pin joined the earth).


1.5. Any one of the above three methods is acceptable.

How to simply judge whether it is well grounded:


2.1. Use a test lead of the multimeter to measure the “ground” of the socket (before testing, please make sure that there is actually a ground connection here)


2.2. Another test pen to test the product shell, or the metal shell of the HDMI female seat, the metal shell of the HDMI female seat of the splicing screen, etc.


2.3. The multimeter uses DC or AC gear, and when it is properly grounded, it is 0 V.

connect earth

Failure cause analysis:


3.1. Customers use LCD splicing screens on site. Customer feedback that it is easy to burn the output board of the matrix.


3.2. According to our test, although the output board has ESD protection, the chips in the board will be burnt after rework. The most probable cause is improper grounding.


3.3. We speculate that there should be equipment related to frequent switching on and off at the customer site. Because there is no good grounding, when the power is turned on, the “ground” voltage between the various devices Poor cause the chip to burn (not caused by static electricity).

Perfect grounding method

connect


Actual grounding method – signal source


5.1. DVD: Generally, it is a national standard two-phase plug at the end of eight characters. Impossible to touch the ground.


5.2. Camera: Generally, it is powered by an external 12V power adapter, and the national standard two-phase plug at the end of eight characters. Impossible to touch the ground.


5.3. Laptop: external power adapter, generally a three-phase plug with a national standard suffix (including a grounding pin).


5.3.1. It is necessary to confirm that there is a ground pin in the socket (the standard construction has a ground pin)


5.4. PC: Built-in power supply module, usually a three-phase plug with the suffix of the national standard product (including the grounding pin).


5.4.1. It is necessary to confirm that there is a ground pin in the socket (standard construction has a ground pin)


Actual grounding method – matrix


6.1. All are three-phase plugs with national standard suffixes (including grounding pins).


6.1.1. It is necessary to confirm that there is a ground pin in the socket (the standard construction has a ground pin)


6.2. The chassis is equipped with ground screws separately. Please purchase a compliant grounding cable and connect it to the grounding of the cabinet.


Actual grounding method – display device


7.1. Ordinary LCD TV: generally a national standard two-phase plug at the end of eight characters. Impossible to touch the ground.


7.2. LCD display: Generally, it is a three-phase plug with the suffix of the national standard product (including the grounding pin).


7.2.1. It is necessary to confirm that there is a ground pin in the socket (the standard construction has a ground pin)


7.3. LCD splicing screen: The power module used for regular splicing screens is generally a three-phase plug with a national standard suffix (including grounding pins).


7.3.1. For non-regular splicing screens, common TV power modules may be used, and the national standard two-phase plugs at the end of eight characters may be used. Impossible to touch the ground.


7.3.2. Even if the power module adopts the three-phase plug with the suffix of the national standard, it is necessary to confirm that the grounding pin of the AC power socket is connected to the ground of the driver board.


7.4. LED dot-matrix wall: the power supply module used for regular dot-matrix walls, generally a three-phase plug with a national standard suffix (including grounding pins).


7.4.1. It is necessary to confirm that there is a ground pin in the socket (the standard construction has a ground pin)


		

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