hi , my motherboard is short after ram change. here is some pics. i think this component is short. thank you
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The angle of the shared last pic is not clear but appears to be with topside markings of "LE=" ? If there is an '=' in the markings, the part is from Richtek. Only the first 2 letters of the markings are relevant. The markings after the '=' are the manufacturer's datecode for this component and can be ignored.
In searching for 'Richtek LE=', the part is:
Richtek RT6258BGQUF
https://www.richtek.com/assets/produ...S6258BC-03.pdf
To confirm if this part is shorted, remove all power -> meter in resistance mode -> measure the resistance to ground for the output of this regulator. Also a good idea to test the same in DIODE mode on your meter. Red meter probe to ground; black meter probe onto the output of the point to test.
Post each measurement. -
thank you mon2 . i see now from datasheet that VCC and VOUT have short to ground also when component removed . but now there is no overheating component . when i test the component outside the board there is no short on it . how can i know what component is short ???
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From the schematic, there are a number of this part onboard. This exact part must be the one with a 'B' in the suffix. Based on this search, your defective part is @ U6002.
Can you confirm that VCC (pin # 9) is with a short? Remove all power -> meter in resistance mode. What is the exact resistance to ground? Same question for VOUT (pin # 10).
Respectively, VCC is a LDO (low current) output rail that accepts the high voltage on VIN and lowers it to a suitable 5 volt to power thic IC. Only being loaded by the IC and C6028. Carefully flux and remove C6028. Then check the resistance to ground again for VCC.
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ok thank you .i think cpu is shortingComment
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Hi All, I have a 9th Gen Dell Optiplex micro PC motherboard which doesn't power on. When I connect the motherboard with power adapter, it goes into safe mode and turns off. So from info I have gathered online, it looks like there is a short circuit on the motherboard. So can you guys help me with figuring out the issue?
I am new to electronics repair, so my queries could be naive but I am ready to learn.
So I have a multimeter and a solder with me. But I can try to get a variable voltage power supply with a thermal camera as well. From what I seen online, best way is... -
Hi,
I am working on an Asus ROG laptop repair. I was able to find that there is a short on the motherboard, and the 20 volts from the charger only gets to the first mosfet before disappearing.
When looking around with a thermal camera, I noticed the chip marked "14C" in the picture was getting warm. Nothing else was receiving heat.
I found a boardview diagram and schematic for a motherboard that looks nearly identical, that has the same component. This appears to be marked as "AC Short Protection" with a value of 13.7KOhms.
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Hi beginner here, so I'm not sure of I've done this right 😅 trying to diagnose my laptop's motherboard (dax31mb1aa0 rev a). I don't quite know how to read the schematic, so I'm attaching the pictures of the motherboard and the measurements.
I was attempting to measure resistance to GND on inductors. I disconnected motherboard and used "continuity testing" setting on my multimeter. I put black probe to Ground & red probe on an inductor. Did I measure this right? Am I correct to think that 0.3 ohm measurement indicates a short circuit? Thank you for your help!... -
the comon problem they say , the charger will shut off power once plugged to laptop , i dont have battery, its long gone ago , i use it for backup with adapter and vga port to external monitor(yes no screen lcd) in case my desktop needs fix . one thing for sure i could say the clr resistor - r010 beeps ,short at both sides , the checked all the coils , the 3 coils together gives all of them beeps short along with their respective capacitors . i dont have voltage ampere injection dc machine as in videos i have seen they see where its getting hot and they remove the short and replace components... -
Hello!
The image is visible, but there is no backlight! On older Lenovo laptops, this problem could have been solved by replacing a fuse, but now I can't find the solution!
ThinkBook 13s-IML (20RR)
P207JXJ6...
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