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November 19th, 2022 07:00
Dell Inspiron 5770 Charging Troubleshooting
Inspiron 5770
Hi,
recently, my Inspiron 5770 has encountered the problem of powering on, but not charging. Right off the bat, I checked the voltage coming from the charger, from the charging port and saw that it reads 19V which is good. Next, I followed the traces to component "PJP1." Turns out that the component was in contact with a loose screw and messed something up. Now, my questions:
*Mosfet was measured to verify PJP1 and mosfet was connected.
-It seems odd that the component is outputting 3.1V, is this normal?
-What is PJP1? Is it a resistor? Does dell provide a list with what each component is?
ejn63
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November 19th, 2022 07:00
You would need to purchase a schematic for that level of detail -- no major manufacturer provides schematics for boards.
See here: http://laptop-schematics.com/
Even if you do identify the faulty part, until you start replacing components, you won't know exactly what is faulty. Logic circuit MOSFETs can output 2-3 V, so that may be normal.
The problems:
1. A short (which is no doubt what happened here) can take out other components on the board.
2. Even if the only issue is the circuit that allows the system to identify the adapter, just finding a replacement part (unless you live in Southeast China) will be difficult to impossible. Even repair shops keep dead boards on hand to salvage components from for this very reason.
3. You would still need a hot air station to even attempt the part replacements.
With replacement boards running $100-150 for this model, and given that replacing the board is the only sure repair path, if you want to repair the system, look around for a replacement system board.
AFE123
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November 19th, 2022 11:00
Thanks for linking to the schematic. I was asking about what exactly the component is. I was also saying that the mosfet was taking in 3 volts. I just put that in my first post to confirm that it's connected to PJP1. I'll probably look for shorts. I'll try and solder a wire from the source to the drain. It might isolate my issue.