Philips CD Sound Machine Repaired
Customer sent me device Model – AZ329 stating problem Not power symptom.
On initial visual inspection everything looks OK from outside.
Checked power cord for continuity test seems Ok. So for further diagnosis I disassembled the device.
opened power unit for inspection.
Found Burn Mark on plastic but didn’t find any burn mark On the PCB or seen any damaged components.
hence tested every components. every reading in proper range…..not tested that 6 pin IC. Here I decided to check the Voltage of power supply output.
On testing I found output is showing 7.5v DC…. checked Back sticker of the unit for confirming it is showing 9v DC.
I am getting Low voltage here. For reconfirm again I checked voltages on the load.
Now on Load Voltage is dropped to 0.82v. Now I suspect the Power supply itself bad because it does not take Load.
For confirmation I used my Battery eliminator as an external power source to this device. I set the eliminator on 9v connected to input of cd player & turned on the device it started working. Checked every functions of the CD Player everything works fine.
Now it is confirmed Power supply is not working as I am having doubt on that 6 pin IC checked code on the 6 pin SMD IC is C2161DX2 it works as Primary Sensing SMPS Controller. On net I found the circuit diagram.
I Know if IC itself bad it is not economical to find & purchase the IC & repair the unit, instead of wasting time further I decided to eliminate this power supply & put new power supply.
On sticker it is showing 10W power rating indicates nearby 1.1Amp for working. so I arranged 9v 2Amp DC adaptor which can fit inside the CD Player. Opened the New power adaptor & removed the Circuit because it is not possible to put whole adaptor inside.
After fitting new adaptor inside the unit I powered the Unit & checked everything working fine.
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 on Bluetooth Speakers Turn Off Within 10 Minutes
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Andrew F. Ali
February 24, 2023 at 9:22 am
Good work. Good diagnosis and solution.
Yogesh Panchal
February 27, 2023 at 1:06 am
Andrew F. Ali,
Thanks! for your comment.
Albert van Bemmelen
February 24, 2023 at 1:52 pm
Interesting repair with useful datasheet info on the Philips primary smps sensing controller IC.
Yogesh Panchal
February 27, 2023 at 1:07 am
Thank you! Albert
Parasuraman S
February 24, 2023 at 3:22 pm
A well thought out alternative fix! Well done!
Yogesh Panchal
February 27, 2023 at 1:07 am
Thank you! Sir
Waleed Rishmawi
February 24, 2023 at 6:29 pm
the knowledge of the fault eliminator is the best way to go here. is it the power supply or there is a short on board? that is the most important question of all. thanks for sharing and have a blessed day.
Yogesh Panchal
February 27, 2023 at 1:08 am
Thanks!Waleed
Paul D.
February 24, 2023 at 9:41 pm
Good job and wonderful descision on interchanging the SMPS entirely.
I would love to know the culprit on the original SMPS since i did some fixes myself and learned valuable lessons.
From looking at the pictures, the PCB tracks on the live part right after the bridge rectifier look horrible. It almost looks like they are corroded to the point they start to vanish. Especially the negative line.
Could be those two resistors in series that burnt (R902 & R902A). Maybe the big capacitors have drained and fail.
It is very suspicious that the parts for the current sensing (CS pin 4 on IC) or even the track are faulty.
Yogesh Panchal
February 27, 2023 at 8:36 pm
Paul D.
Thanks for your input....Uploaded Photo is not clear. i checked both the resistors marked with 4R7 i.e 4.7ohm are OK & within the range & checked continuity of all the suspected traces found OK.actually i should have checked those resistors out of the circuit.as customer is in hurry because he wants to take this unit with him to his native on the same day if the unit get repaired, that's why i didn't waste time on further diagnosis & provided him instant result.