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Knowledge Base

Decoder power source problem causing camera image emerge 50Hz interference fringe

Publication Date:  2012-09-22  |   Views:  332  |   Downloads:  0  |   Author:  q00229199  |   Document ID:  EKB1000015826


Issue Description

When VP 2000 system use SONY 3ccd camera, terminal emerge 50Hz interference fringe.

Alarm Information


Handling Process

1. TV doesn’t connect RF cable, eliminate the RF problem.
2. Exam TV power supply, it is not interfered when receiving TV, and it means TV has no problem.
3. Replace camera source, only the assistant camera is interfered, the problem should be on power supply.
4. Open camera power source, install a 4700ufcapacitance on camera’s power source output side. Problem is solved

Root Cause

50Hz interference fringe means the power source smoothing has problem. The possible reason may be:
1. TV power source smoothing has problem.
2. TV may connect RF, RF brings 50Hz interference.
3. Camera’s power smoothing has problem.
4.  Long video cable brings power source problem.