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Philips 55PUS7272 Hey, today a 55 inch uhd tv rolled in my door and i proceeded with some diagnostics in my attempt to try to learn this kind of stuff. i’m very new but i want to learn hehe. So, to my tests and findings. I plugged in the power, tried powering on with controller and button on the tv. Nothing. I opened it up, unplugged the power cable to the motherboard from the PSU to see if the backlight would turn on. Nothing. I then checked the voltages of said cable compared with the stamped pinout on the board and everything is wrong. Every 5v shows 3.6v and every 12v shows 3.4v. Now, i can replace the PSU, but are my findings a definitive PSU board issue? Also how do i go about finding the exact culprit?
Hi @sikator , Here’s a link to the service manual that may help. I haven’t checked it out but usually service manuals have schematic diagrams that should help you to find out why there is incorrect voltages being supplied. Hopefully this is of some help.
