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I have a circuit board and the fuse keeps blowing. also sometimes the thermistor next to the fuse blows as well. What could be the problem and how will i trouble shoot the circuit board. Please see a photo of the circuit board attached. would really appreciate some help.
Cuircut board problem
- Thread starter kevinkhan
- Start date
Dr.killjoy
- Joined Apr 28, 2013
- 1,196
Have you tried to search Google for the schematic and work from there ... Also for help we need some basic info like wha
t is it for and model numbers and such ...
t is it for and model numbers and such ...
The circuit board is off a disco light which can be seen from this page www.thomann.de/ie/mobile_prod.html?AR=222332 i cant seem to find diagram on google. 
Im not sure about that. Ill check this tomorrow when i wake up. Why do you ask this?
apprenticemart2
- Joined May 7, 2013
- 67
Use your nose.
??? Please only respond with useful information
That acutally was useful, often you can pinpoint the bad component by smell. Also please post more detailed photos of both the components and the bottom of the board.
Ah, it's used to limit inrush current and allow the circuit to warm up gradually.
Most damaged components have neither visual indication nor smell.
He describes a typical inrush current limiter. Damaged because some other failed part is probably causing excessive current flow. A part causing excessive current and the resulting damage probably has no smell nor visual indication.
-1
Visual inspection is a key tool, and smell can occasionally supplement what your eyes are telling you. A big dark circle that smells like phenol is like a red flag. You won't find everything this way, but you'd be rash to ignore the easy signs.
