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What to build to test Laptop/TV psu?
What to build to test Laptop/TV psu?
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Old 26th July 2019, 06:13 PM   #1
XsamuraiX is offline XsamuraiX  United Kingdom
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Default What to build to test Laptop/TV psu?

Can I build a simple tester to see what a TV external PSU measures under load?


I was thinking a PSU input socket attached to some hair dryer fillament? But then, what will the PSU power up? So I can take a reading.
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Old 27th July 2019, 07:43 PM   #2
russc is offline russc  England
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Car bulb?
Whatever suits the voltage & current.
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Old 27th July 2019, 08:34 PM   #3
rayma is offline rayma  United States
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Use a low frequency current probe, clamped around (only) one of the power cord wires.
Or a DVM on current range, in series with one of the power cord wires.
Run the TV as normal. Gravity: Analog AC Current Sensor-DFRobot

Last edited by rayma; 27th July 2019 at 08:50 PM.
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Old 1st August 2019, 10:13 AM   #4
warrjon is offline warrjon  Australia
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I have an element from an old fan heater I use as a load. just use alligator clips along the wire to get the load R correct.
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Old 1st August 2019, 11:21 AM   #5
Mooly is offline Mooly  United Kingdom
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What to build to test Laptop/TV psu?
Bulbs are OK except that they can (they do) appear as a very low resistance load when cold and this can cause some PSU's to react badly or trip thinking there is a shorted load.

A pure resistive load is best... and old element wire is great for low voltage testing.
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