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Hi I got Sony kdl-46w905a and it won’t turn on and no red blinking code and all I hear when I plug it in is a clicking noise and a pause for a second then another clicking noise as if the power supply has a relay and is relay is turning off the power supply bcuz of a problem, bcuz of this I have no way to check voltages anywhere as there’s no standby light but I think I get a white light for a second then goes off, I’ve checked for bad capacitors or shorted mosfets but haven’t found a problem, and I was thinking if there’s a way To bypass the protection so it stays on so I can check voltages ? Or maybe someone can help me on what to try ?

Imran Ali  right now this sounds like a power board issue. We need to see what you see and need to know how you checked the MOSFETs. Post some good pictures of your power board with your question. Adding images to an existing question Unless there is a schematic available it will be almost impossible to determine which component has failed. Since you do not get standby etc. it is most likely that you will need a new power board. Let’s see what your boards look like etc. ===Update (10/21/2019)

Imran Ali   here is the Sony triage chart for your model. It will be most common errors for your symptoms

After that you want to go to the troubleshooting for the “no power” situation

To identify the component you will have to check your board model

Let us know what you find out