PQB11 is reading zero ohms in circuit. At this point, having informed my manager, he has declared the board BER and to stop attempts to repair it. I've located a replacement board - only £1,800 - so, nah, not happening.
Unfortunately, the story ends here.
Thank you Mon2 and Reformatt for your help.
CPUFiddler
Katie
Last Activity: 06-14-2025, 08:13 AM
Joined: 05-12-2012
Location: Flintshire, N. Wales
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I am in the UK so China shipping times can be excessive as can be the import costs. Also, if I haven't made it clear, I'm volunteering at a charity. No saving spared on a job.Leave a comment:
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I have ordered replacements for PQB1, PQB2 and PQB13. If there are any other components you would recommend I replace, by all means, let's reduce the shipping time by immediately grabbing them. Sorry if language is unfriendly.Leave a comment:
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Some of these readings did vary and I'm not sure if that's simply because the currents are so small. I'm using a Fluke autoranging multimeter from the 80s.
PQB1
Source-Drain (Pins 1 & 8) = 2MΩ
Source-Gate (Pins 1 & 4) = 210KΩ
Gate-Drain: (Pins 4 & 8) = 1MΩ
PQB2
Source-Drain (Pins 1 & 8) = 2.2MΩ
Source-Gate (Pins 1 & 4) = 190KΩ
Gate-Drain: (Pins 4 & 8) = 1.7MΩ
PQB13
Source-Drain (Pins 1 & 8) = 1.2MΩ
Source-Gate (Pins 1 & 4) = 2.5Ω
Gate-Drain: (Pins 4 & 8) = 1MΩ
...Leave a comment:
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I have access to the board today, and a multimeter. The two MOSFETs arrive tomorrow.Leave a comment:
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Unfortunately I won't have access to this board again until Saturday 10am UK time. Thank you for the advice so far.Leave a comment:
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red probe on pin 3, black probe on pin 1 = meter shows 217
black probe on pin 3, red probe on pin 1 = meter shows open circuit, 1
red probe on pin 2, black probe on pin 1 = meter shows 217 or 218
black probe on pin 2, red probe on pin 1 = meter shows open circuit, 1
red probe on pin 3, black probe on pin 2 = meter shows 360
black probe on pin 3, red probe on pin 2 = meter shows open circuit, 1...Leave a comment:
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Resistance from pin 19 to pin 20 on PUB1 is 20.5 ohms, allowing for probe lead resistance. PLB1 and PLB2 are intact, as is PRB19. The MOSFETs PQB1, PQB2 and PQB13 all appear undamaged with no discoloration when viewed under the microscope.Leave a comment:
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Will do so in around an hour's time. What sort of value should I expect?Leave a comment:
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Acer Nitro 5 AN515-45 not charging
Hi there. I am trying to repair an Acer Nitro 5 AN515-45 and it's giving me some trouble. I have access to SMD rework station, variable power supply, digital oscilloscope, thermal camera, multimeter, stereo microscope.
This laptop will boot and run from the power brick and/or the internal battery, but it will not charge the battery. NirSoft BattInfo tells me the charge/discharge currents, so I'm confident in saying that it's not charging. In addition, there's no increase in voltage at the battery connector when the laptop thinks it's charging, not even a few millivolts.
I've downloaded...
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