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CCTV Power Adapter Repaired
Visited one of my customer sites with the complaint of none of the CCTV Cameras were working.
Symptom found was-
On the monitoring screen it shows “No signal” error. By visual inspection I found power to the camera was not working. So I went to the DVR room and found that the SMPS provides the power to the Cameras has no indicator light glowing. I checked the SMPS output with multimeter it does not showed life.
Adapter is 12V – 2Amp. So customer have arranged new adapter and I have fixed the same and all the cameras were working now. Now I took the bad adapter with me to fulfill my curiosity that what went wrong with the adapter.
On return to the workshop I took the adapter on the work bench and opened it for inspection, visually I found everything was fine and there was no physical damage or burn marks only main primary capacitor was bulged.
Bulged Capacitor is of value 22uf 450V .So I have replaced the mains Capacitor. After replacement I have powered the adapter but LED Indicator not glowing. With the help of multimeter I started to test the voltages step by step.
First checked the DC voltages on the Mains capacitor I got 340V DC that means primary side up to mains Cap is ok. Still no voltages on secondary side.
Checked secondary side components everything seems to be OK but no voltages so up to LNK666E IC there were no voltages. LNK666E is a 7 Pin IC (High-Power Off-Line Switcher with Accurate Primary-Side Regulation IC).
So this is the one component which I am unable to check, so on doubt I have arranged the new IC from our market.
After replacing the IC I have powered the adapter and see.
This way I have brought this adapter back to the life.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles in the link below: