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Knowledge Base

There is interference in multi-image local export

Publication Date:  2012-09-22  |   Views:  125  |   Downloads:  0  |   Author:  SU1001048203  |   Document ID:  EKB1000015690


Issue Description

When we use multi-image local export, we may see the image has interference like fishnet or crooked stripe.

Alarm Information


Handling Process

1. The TV for local export doesn’t access other signal cables for other use.
2. Don’t use the cable too long. Please short circuit one or two inductor in board if it’s necessary.

Root Cause

There is a protect inductor in local export’s signal cable and ground trace, so it will become voltage drop in image signal. It’s normal popularly, but it wound product interference in these two situations.
The first is the TV has accessed other signal cable except local export. Because there is a inductor in ground trace, when other signal cable’s ground level is not the same with local export level, the current will take voltage drop in ground inductor. There will be interference in image.
The second is the video cable for transmission is too long. It’s not the inductor’s problem, but the voltage drop of inductor make the image easy to depress, the length of cable become short. So we can see the interference if the cable is too long.