G_sene
Member
Last Activity: 07-22-2025, 01:34 PM
Joined: 07-29-2023
Location: Cachoeira Paulista/SP
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So what can I do to see if I can resolve the VIN issue, is it a jumper from a component in the VIN loop to the PR304 resistor?... -
One side of PR306 continued with PR304.
Hitting 200k as shown in the diagram.
But one question remains.
How is the battery voltage getting to the charger connector? The input MOSFETs shouldn't allow this to happen, due to the internal diode, right?...Leave a comment:
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I just measured from PL706 (VIN) to PR304, I got 3Mohm...Leave a comment:
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It arrived and wouldn't turn on. It seems it was out of order because it stopped turning on and only the LEDs were on.
The PR306 is also in line with the VIN, from what I saw....Leave a comment:
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I removed PQ303 and it still has 0V at the gate.
PR304 has 47kV and no voltage from the adapter.
PQ308B
Pin 3 - 0.200mv
Pin 4 - 0v
Pin 5 - 0.230mv...Leave a comment:
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Whether on or off, it stays that way.
With the adapter, the voltage rises to 14.09V drain and source, 0.018V gate (battery and adapter)....Leave a comment:
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Only battery
source 13.92v
drain 13.92v
gate 0v...Leave a comment:
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1) 3.4v and 5.1v
2) 0v the both
3) 0v the both...Leave a comment:
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It had 1.44v before putting the extra resistor...Leave a comment:
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561ohm...Leave a comment:
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It didn't work.
560 ohm resistor on pin 3 of the jack (ID pin) and the other terminal to ground....Leave a comment:
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I replaced the PQ301 and it still doesn't work.
The charger isn't recognized, and the voltage on pin 1 of the jack is 14V.
Oh, I managed to test another charger with a lower amperage, but it wasn't identified either.
Bad battery?
Strange that it doesn't even identify the charger, and the computer remains connected only to the battery....Leave a comment:
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I'll measure it again.
But before replacing the PQ303, it looked like this:
With charger and no battery:
PQ301 and PQ302
Pins 1, 2, and 3 = 20V
Pin 4 = 9V
Pins 5, 6, 7, and 8 = 20V
With battery and charger:
PQ301 and PQ302
Pins 1, 2, and 3 = 14V
Pins 4 = 5V
Pins 5, 6, 7, and 8 = 14V
Another detail: the 14V battery voltage reaches the charger input! I don't think this was supposed to happen.Leave a comment:
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PQ301
source (pin 1) - drain (pin 8) - 544k
source (pin 2) - drain (pin 7) - 543k
source (pin 3) - drain (pin 6) - 543k
source (pin 1, 2, 3) - gate (pin 4) - 200k
gate (pin 4) - drain (5, 6, 7, 8) - 343k
PQ302
source (pin 1) - drain (pin 8) - 1M
source (pin 2) - drain (pin 7) - 1M
source (pin 3) - drain (pin 6) - 1M
source (pin 1, 2, 3) - gate (pin 4) - 200k
gate (pin 4) - drain (5, 6, 7, 8) - 390k
Only with the battery plugged in, I still have 5v at the gate of PQ301 and P...Leave a comment:
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Model: PA-1900-72
20v - 4.5a
90w
I didn't ask if this charger was used before.
According to the customer, the laptop no longer turned on and was stored without working.
Another observation, when the charger is plugged in with the battery, it makes a ticking noise, it sounds a lot like a clock, something like that....Leave a comment:
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5.59k in ADAPATER_ID
Pin 3 of JDCIN1...Leave a comment:
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This Lenovo's bios doesn't show anything about this....Leave a comment:
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I'll try to attach a photo. But it appears to be straight, without any damage....Leave a comment:
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Sorry
I tested pin 84 ADAPTER_ID_ON(3.3v) and pin 72 ADAPTER_ID (1.44v)...Leave a comment:
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