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How do you test an internal power supply on a 46" lcd sharp…

Customer Question
How do you test...

How do you test an internal power supply on a 46" lcd sharp tv ? It powers up for 3-5seconds then shuts off

Technician's Assistant: What Sharp model do you have? How old is it?

Sorry, i dont have it right now

Technician's Assistant: Does the TV menu work? Do you have the same problem on all sources/inputs?

It doesnt stay on long enough to do anything

Technician's Assistant: How long has this been an issue with your Sharp? What happened right before this?

I dont know ,my nephew gave it to me and said he had brought it in to see what was wrong and tech told him power supply

Submitted: 3 months ago.Category: TV
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Answered in 2 hours by:
3/14/2018
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 3 months ago
Dan
Dan, Master Tech and Repair Facility Trainer
Category: TV
Satisfied Customers: 7,480
Experience: USAF trained; A.A.S Electronics; A.A.S. Education; Currently teaching advanced troubleshooting and repair for the DoD.
Verified

Welcome to the site! I'm Dan. Before I can help you troubleshoot, I need to know the model number from the TV's rear panel.

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Customer reply replied 3 months ago
Lc-46sb54u
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 3 months ago

Great, thank you! OK do you want assistance in replacing the power supply, or do you have a multimeter and the ability to measure voltages?

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Customer reply replied 3 months ago
I have multimeter and ability to test for voltage.
TV Technician: Dan, Master Tech and Repair Facility Trainer replied 3 months ago

OK, great. When the TV shuts off, what do >>the LEDs<< on the front of the TV do? Do any of them flash?

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