Hello guys I need a little help here. I'm trying to fix this graphics card regarding it's 5v missing. The card came to me with a shorted buck converter GS9230 (U501) with zero output. I replaced the IC with a new exact same model and the short is gone, but still no output. I checked surrounding components and there seems to be nothing else is at fault as to my knowledge.. I removed coil (L500) to isolate furthermore.
Thinking that the new buck converter could be defective, I decided to replace it again with a new one but same result. This buck converter is a standalone IC which outputs 5v as gate driver and is powered by 12V bus supply (pin22), which meter reads at 11.99v. I also have 5v in VCC (pin21). Enable, pin2 is at 4.8v (not sure if this is correct). What else do I need to check? I uploaded boardview, schematic and image. Hope someone helps. Thanks!
Thinking that the new buck converter could be defective, I decided to replace it again with a new one but same result. This buck converter is a standalone IC which outputs 5v as gate driver and is powered by 12V bus supply (pin22), which meter reads at 11.99v. I also have 5v in VCC (pin21). Enable, pin2 is at 4.8v (not sure if this is correct). What else do I need to check? I uploaded boardview, schematic and image. Hope someone helps. Thanks!
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