Issue with the motherboard's power regulation.
Issue with the motherboard's power regulation.
Looking for a replacement choke for your Gigabyte Z97MX Gaming5 motherboard? The issue seems linked to a short in the eight-pin CPU power supply socket. After testing continuity with a multimeter, the problem appears near the plug. The part number is 1 RO L 1504. Spent a lot of time searching online and on marketplaces without success. Any suggestions?
The issue for a choke to fail would be when it stops conducting, meaning you wouldn't check continuity but instead see an open circuit or extremely high resistance. As @Kilrah mentioned, a blown high-side MOSFET or a shorted decoupling capacitor is more likely the cause. A faulty component later could lead to the choke blowing up, functioning somewhat like a fuse. Simply swapping the choke won't solve the problem, and it's probable the choke itself is still operational.
Thanks for your responses. I'm new to troubleshooting dead motherboards. I took off the heat sinks and, based on my limited knowledge, used a multimeter to test the MOSFETs. No unusual smells and they passed the check. (It might be hard to verify them on-site properly). Other motherboards tested show no connection across the 4 or 8 pin CPU power supply, which suggests there could be more to it. The main concern is where to purchase one, as this is my first step.
You're asking about the setup and readings in your circuit. One side of the MOSFETs needs direct connection through the inductor to 12V, and if the 8-pin shows a short, the high-side MOSFETs should too. There seems to be some inconsistency—either the readings are off or the measurement point is incorrect. Check the resistance across the 8-pin: one side should be all 12V, the other all ground, but it should show a measurable value in ohms or megohms. The choke, being just wire, should have very low resistance.
Thanks all. Like I say, I'm new to all this repair stuff and am more the hobbiest not wanting to let go of the bone. This YouTube video, I have used his test Picture of the board with failed mosfets. Photos don't clearly show the leakage on the choke side. I have not been able to find replacements with this code. In fact the code is alien to me, having no idea of voltage etc. I have Emailed who I believe are the manufactures (Vishay) and am awaiting a reply. Surely there must be a comparable items that will safely work for a replacement, though this comes back to the fact, I have no idea. Cheers