BTubbs200
Member
Last Activity: 02-25-2025, 10:45 PM
Joined: 01-23-2025
Location: Sheridan, AR
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I had reflashing bios in the back of my mind, unfortunately I decided to go a different route and botched a PD controller replacement. Board is completely dead at the moment.... -
My attempt to replace the PD controller has put me in a worse spot than before, and now the charger is supplying no voltage to the board and my CC lines are absent, so I'm not sure I can help with this query. I did check, though, by probing CT44 which feeds into pin 5. Couldn't get a reading, multimeter said OL....Leave a comment:
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I haven't. Spent a long time studying the board but couldn't find anything that pointed toward being the cause of the problem.
I tried replacing the USB-PD chip thinking maybe it was failing to negotiate voltage properly but I'm pretty certain I botched it. Absolutely tiny 50-pin BGA made of silicon, it was a pain to work with. Didn't fix the issue.
Only thing I haven't tried at this point is reprogramming the BIOS...Leave a comment:
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Elaborate? Does one of my 0v readings correspond to the standby converter?...Leave a comment:
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I still haven't solved this problem but have narrowed it down considerably. I'm fairly confident the CPU/PCH is still good, there's nothing to suggest either is dead, power rail isn't shorted. My current hypothesis is that it's a dead PD or EC chip....Leave a comment:
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[B]CC1/CC2 pins [/B]
TBT_A_CC1: 744mV
TBT_A_CC2: 743mV
TBT_B_CC1: 744mV
TBT_B_CC2: 742mV
[B]DT11 [/B]
CC1: 613mV
CC2: 602mV
[B]DT22[/B]
CC1: 614mV
CC2: 602mV
The port of concern is JBUSBC1. No visual damage but the components are tiny and I don't have an appropriate magnifier to see in detail.[B]CC1/CC2 pins [/B]
TBT_A_CC1: 744mV
TBT_A_CC2: 743mV
TBT_B_CC1: 744mV
TBT_B_CC2: 742mV
[B]DT11 [/B]
CC1: 613mV
CC2: 602mV
[B]DT22[/B]
CC1:...Leave a comment:
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The ports look fine, I forgot to mention there's actually two of them and they're both showing the same symptoms. Flipping the connector 180 degrees resulted in no change on one of the ports, but on the other it resulted in 0 volts supplied to the system.
I do need to pick up a USB-C power meter, I will look into getting one shortly so I can proceed with some more detailed information.
Thank you...Leave a comment:
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Dead Dell Latitude 5420 not receiving 20 volts from USB-C charger
Hello,
Dell Latitude 5420 P137G
Board: LA-K491P REV A01
I have received this laptop which was described as "does not power on or accept charge." Battery shows no sign of charging when charger is plugged in, nor does the board show any signs of life when battery is unplugged and charger is plugged in. No light from the LED at all or any other indications of activity.
Board seems to have no shorts, all power rails are fine and show high resistance.
When charger is plugged in, voltage is present in 3.3V rail but absent in others.... -
Dell Latitude 5420: No charge, no boot; amber LED for as long as the power button is held.
Dell Latitude 5420 P137G
Board model LA-K491P REV A01
Laptop is stone dead and only reacts to the power button being held while the charger is plugged in, in which case a dim amber LED fades in and immediately fades out when I let go. Battery being plugged/unplugged does not change anything.
CMOS battery was removed and reinstalled; no change.
No shorts to ground have been identified on the board whilst probing the power rails in resistance mode. No visibly damaged components.
No indication that the CPU is receiving power; CPU fan does not activate.
Of... -
Hello, I've been following PC repair for a while and am finally trying my hand at it myself. I have lots to learn but I'm looking forward to it.Leave a comment:
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