Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Can you help me finding the problem in those type of power supplys.Problem with load

Status
Not open for further replies.
I

interneti

Member level 4
Joined
Nov 6, 2011
Messages
69
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,288
Activity points
1,715
When i test the power supply the voltage are good, but when i connect the power supply with THE device, The voltage drop and the device cannot turn on. Can you help me please to locate the problem in the schematic in photo.
I have check all capacitor in the secondary and primary section. This problem is very common in power adapter. Please help me to solve this problem. I need to repair this power supply.

THANKS IN ADVANCES.

 

Either test the power supply with an equivalent load or the "THE device" (what's it?) with a lab power supply to clarify which side is faulty.
 

I have tested and with other devices, but again the voltage are good but when i connect with the device the voltage drop.

In common were i have to check at first if this problem happend in any power supply ?
 

is your device is ok. first check your device.
interneti said:
I have tested and with other devices, but again the voltage are good but when i connect with the device the voltage drop.

In common were i have to check at first if this problem happend in any power supply ?
Click to expand...
 

Your 50W supply design may be unregulated on the output. How much drop vs I and is it resistive load or ?

R14 senses overvoltage. Does the LED come on?
 

Just a question:

Why is needed the second diode D3? The diode D4 isn't enough?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top