this machine came to me as DOA and immediately found the issue as a 12v short to ground. Is it okay to inject voltage into that rail or does it have a potential path to the cpu or something?
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Flux and remove fuse @ F5200. Then power up again and measure the voltage to ground on pcb pad # 1 on the removed fuse @ F5200. Is the voltage present and stable? What is the voltage?
Then remove all power. Meter in resistance mode. Measure the resistance to ground on pcb pad # 2 on the removed fuse @ F5200. -
12.38v is stable on #1. direct short to ground on #2. 0.3 ohmsComment
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Inject 1 volt (not higher) onto the pin #2 side and test who heats up. If it is a capacitor, it will crumble / crack under the pressure. The fault may be the CPU but TBD.Comment
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was a bad capComment
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Board booting ?
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it boots
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Good morning. I deliberately bought a motherboard in unknown condition, hoping it would work, but unfortunately, Murphy's Law worked as usual this time. Asus Tuf B360m-E Gaming motherboard. After connecting the power supply, the component marked B45PO3 lit up like a Christmas star, and the NCT5582D also overheated. After desoldering the B45P03, nothing heats up anymore, but there's a problem with a short to ground on the coil and in the area marked PO3001 on the board. I'm not sure if it's lines 3, 5, or the main power line.
Could anyone suggest where I should start looking for the cause... -
hello everyone , working zebronics power suply 450 watts , 5v ,3.3v givin short to ground black wire, also in circuit at output, resistor was charred but shows right values , after removing resistors 39ohms, 51 ohms, there was no short , no continuity beeps with ground , but after replacing new resistors (now i am not switching it on) ,again short still exists . when i put bigger ohm resistor like 100k ohm , no short beeping sound comes , lower ohm resistor gives continuity beeps ,other big ones donest , as its a working psu , i am confused what to remove now or how to go further now .
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Hello, I have a pcb from an e scooter which had a faulty diode but even after removing it from circuit, it still has a short to ground on the three components circled. I have removed every cap on the board and tested one by one and the short is still there and all the caps test ok. Could this be because I haven’t put a diode back on it yet or where do I go next please? -
Good day, everyone. I've got a B450 Gaming Plus motherboard, which upon plugging into a PSU lights up the miscellaneous LED's, and BOOT, VGA, DRAM LED's, which are constant.
It does not boot, the fans don't spin.
I've started troubleshooting it, by checking voltage rails from 24 pin to ground, and found all 5V shorted to ground. Visually the board looks good everywhere, I don't see any burns neither on the front, nor the back.
If I leave it plugged in for sometime, the chipset gets warm.
Please help, I have attached the schematic I found.... -
Hello everyone,
Firstly sorry for my english, french guy inside.
I brought a macbook pro A1708 - 820-00840 logic board, wasn't powering on.
History is a day, nothing happened when opening the laptop.
Nothing special inside, no corrosion, no liquid damage, never opened.
First, with the logicboard alone on the desk, mesures are :
5v017 and 0.000 amp. nothing else.
Finding a short on the PP3V3_G3H_VR, but not on the PP3V3_G3H (0.540 on diode mode), PPDCIN_G3H_CHGR_R present (5,1 volts) PPVIN_G3H_P3V3G3H around 4.1 volts. PM_EN_P3V3_G3H...
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