Repair Dell Optiplex 7010 SFF board Need assistance fixing your motherboard?
Repair Dell Optiplex 7010 SFF board Need assistance fixing your motherboard?
I write this subject to provide details about fixing this kind of motherboard made by Dell with an unusual layout. The model in question is a Dell 7010 Sff, version 0WR7PY. Issue: It won’t power on and the diagnostic LED keeps flashing. Even when connecting the ATX power supply without pressing the power button, it attempts to start, but the fans activate and then shut down instantly. I’ve noticed similar problems in regular boards with a short circuit somewhere in the circuit, not near the CPU 4-pin connector. Using a multimeter, I detected an inductor coil shorted to ground close to the ATX connector—possibly an LDO IC or an SMD capacitor (photo 2 red circle). It seems the coil shouldn’t connect to ground since the coils are on positive lines. Next, I plan to test by applying voltage through the positive rail to see if current flows and to check for overheating. At this point, I don’t have the schematic or completed tests yet. I’ll also look up the datasheets for any ICs in that section that might be involved. If you’d like help with this topic, your contribution would be appreciated. Have a great day!
The simplest solution I found to bypass shorting problems is simply submerging the board in water after fully discharging it (clear CMOS and press power button for 2 minutes). The main drawback is it doesn’t work for shorts that aren’t caused by dirt. I don’t have any electrical expertise or tools, so I haven’t tried to fix shorted boards yet.
The image appears to show only MOSFETs, not any ICs. It's typical for an inductor to be connected to ground during testing. I question if the inductor was improperly soldered, as that would suggest poor manufacturing. Additionally, the board seems intact, so the issue likely lies elsewhere.
This IC (marked in the photo with red lines) is called a DDR Bus Termination Regulator based LDO regulator. When shorted to ground, the coil inductor also shorts. Fixing the faulty parts will resolve the issue. The next action will be reviewing the datasheet to identify the positive and ground connections.
You possess the correct information but not fully. The list section starts from left to right: 1pz.- AON6414A 30V N-Channel MOSFET, 2pz.- AON6418 N-Channel AlphaMOS, 1pz.- RT9646A 5 Channels ACPI Regulator. I have the datasheet and plan to test the positive line for short detection. The small SMD (CP202) capacitor indicates a short across its terminals.
Hi Jaseem, Im helping you in this thread, but you need to be 100%sure you have a short circuit in the board, before anything: Use the motherboard with cpu, memory ram and both fans connected: cpu fan and case fan, connect power button with testing leds (you need to have 2 leds look for the image in this tread), connect atx 24pin and 4pin cpu, now turn on the atx Psu or connect to electric wall plug. is the diagnostic led blinking and what code is showing? is the speaker beeping and what code? If the motherboard not start up, search for fails codes on inernet, ill explain how to detect the short circuit in the motherboard: you can use this datasheet to know IC´s pinout, https://html.alldatasheet.com/html-pdf/2...T9645.html Disconnect ram, atx and retire cpu for testing and search with multimeter. Whti multimeter search for a short circuit between Gnd and Vcc terminals, SB5V means Standby positive terminal. If you found short circuit between Gnd and positive lines may be this Ic is failed, but may be its a smd capacitor or another component. For to be sure you ll need injecting voltage and found the component is overheating, watch this video to know the technique: