Help reviving DS-2CD4526FWD-IZH

[hieppo]

Hi,

I got 10 of these DS-2CD4526FWD-IZH from a company upgrade. These were in service over 10 years. But recently 4 of them had the dreaded cap hiss. All 4 had the same bulging cap 470uF 10V. I replaced them with 470uF 25V. However, I was only able to recover 2 out of the 4.

I am not sure if there is a fuse or short but the board looks clean without any char marks.

I did notice that the 3.3 and 1.35 volt test points were not providing proper voltage.

Any assistance would be greatly appreciated.

 

[DGMAX99]

Hi,

I got 10 of these DS-2CD4526FWD-IZH from a company upgrade. These were in service over 10 years. But recently 4 of them had the dreaded cap hiss. All 4 had the same bulging cap 470uF 10V. I replaced them with 470uF 25V. However, I was only able to recover 2 out of the 4.

I am not sure if there is a fuse or short but the board looks clean without any char marks.

I did notice that the 3.3 and 1.35 volt test points were not providing proper voltage.

Any assistance would be greatly appreciated.

View attachment 142363View attachment 142364

Hey hieppo, I realize this is an really old post of yours, and this is a long shot, but did you ever happen to figure out why your DS-2CD4526FWD-IZH cams would not come back after the cap replacement?

I have one of these cameras and it recently quit working. I found the "bulging" 470uf 10V cap also, and as you did, replaced it with a 470uf 25V cap, but the camera still shows no sign of life. I suspect there may be a fuse cleared, but without a schematic, it is hard to tell where it may be since SMDs are not always marked well. There is what appears to be a 5A next to the connector strip, but it checks good. I had been operating it off PoE power, but I don't see anything marked as a fuse around the ethernet connector general area.

Anyway, hoping you get notice of this post, and are maybe able to assist.

Thanks!