jedjann

hi can anyone help me with this prob when the camera has light it is normal but when all lights are off and the infrared lights are all on it turns in to grainy or noise pic.. anyone can help me with this issue.. i posted a sample below.. i open the cam and it has sony ccd camera. thanks

http://www.mseedsystems.com/products/view/124/vandal-proof-ir-camera 1/3"Sony CCD 420TVL 3.6mm With IR thats all its info.. That problem came up 1 year 1/2 after it was installed.. It was a fine camera when it was its first year of operation.. The more month follows the grainier it be came