Electronics > Beginners
Dell LCD TV turns off by itself after a few seconds
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MrAl:

--- Quote from: kasumyku on April 21, 2019, 05:50:15 pm ---Hi everyone,

I just got a Dell Tv W3207C. It powers up, backlight comes on for a couple of seconds then it shuts of by itself. Only once I had it on for a bit longer and I could see onscreen menu for a brief moment then it disappeared and it shut off again.

Things that I tried and found so far:

-looked for obvious burn marks, swollen caps: seem to look OK
-checked power board output voltage: not OK. 3 pins should read 5Vdc but instead they read 1.591Vdc as bellow

Power board has 3 output connectors:

1st connector: +12VS reading 11.8Vdc
                      GND                0Vdc
                     +5V                 1.591Vdc
                     +5V2-STBY       5Vdc
                     +3V                 3Vdc

2nd connector: +24V             24.32 Vdc
                       GND              0Vdc
                       ON/OFF         0.466Vdc

3rd connector: GND              0Vdc
                     +24V              24.04Vdc

I removed T-con and inverter connectors one at a time to see if there is any difference in the output voltage but nothing changed.

I'm not sure if I really narrowed it down correctly to the power board or there's more to it. I also searched online for service manual and no luck.

Any advice would be really appreciated because I don't really know where to go from here due to my little knowledge of troubleshooting electronics to component level.

Thank you in advance!!

--- End quote ---

Hi,

That's what happens when the electrolytic caps go bad.  You said you visually inspected them but maybe you have to do some electrical tests.  I've had same thing happen on an AOC tv set and other things too.
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