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Old 04-27-2018, 09:21 AM   #15
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Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
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Posts: 38,932
Default Re: Dell U2413 turning off

PS1 is the standby power supply, it is working that is why you are getting the button to light up.
PS2, PS3 are the main switched power supplies that require the PFC Voltage to run, but since the PFC Boosted Voltage is low so PS2/3 stay in the shutdown mode.
At this point we need to verify if the PS-ON is present or not or we can verify to see the PFC Controller IC is getting the switched Vcc to run or not.
If you look at the picture of the top side, I marked the PFC IC, we need to the P/N as printed on the top of the IC, report what ALL the prints on top of the IC, so we can look up the spec. sheet for it.
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.

Voltage Regulator (LDO) testing:

Inverter testing using old CFL:

Tear down pictures : Hit the ">" Show Albums and stories" on the left side

TV Factory reset codes listing:
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