Got a Dell Wistron board with a charging problem. The board starts fine with adapter only. If the battery is connected by itself-no start. It also wouldn't start with the battery and adapter together, so I tried to short the power button and it blew PU4004 and 4006 (p.40). Have replaced the charging chip and PU4004 and 4006 but now every time I simply plug the adapter in the board is instantly shorted and it's always 4004 and 4006. I'm suppose to have 1.4-3.6v from PL4001 but it's way high because the voltage coming from pin 19 of PU4005 is about 15v, it's suppose to be a lot lower. I'm guessing that high voltage is what's killing 4004 and 4006. I bought 2 new charging chips and the output of pin 19 is the same on both of them. what to do?
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Last edited by p1muserfan; 09-26-2014, 08:41 AM. -
Re: Charging circuit hell
Replace Pu4005,4004,4006 all at the same time -
Re: Charging circuit hell
ok replace pu4005 only and check the the out at pin 19 ,4004/4006 out
and pl4001 coilLast edited by cyberhack; 09-26-2014, 10:01 AM.Comment
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Re: Charging circuit hell
Charging chip is not blowing 4004 and 4006, removed 4005, installed new 4004 and 6, plugged in board and they still crapped outComment
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Re: Charging circuit hell
If you remove pu4006 no ground pu4004 and what voltage did you get on pin 19 and I told you to remove l4001 so no voltage is coming from the battery or battery not shortComment
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This board attaches to 2 12v batteries in tandum (Black/Red squares). There is a 24v power supply that attaches at the 2 pin molex connector (circled in red). I need help to determine which components run the charging circuit in an effort to determine a point of failure. There are multiple via's, making it difficult to trace the circuit. Nothing appears to be shorted but I wasn't able to fully test as I do not have 2 12v batteries available. My assumption is that the micro controller (red question mark) determines when to turn the charging circuit on & off. I'm pretty sure a regulator and...
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Hello everyone
Small technical problem on a Nintendo Switch lite
Here's what I noticed: the USB port has been damaged internally, with a short circuit on the power supply line to the small fuse.
After replacing the USB connector, the short circuit went away and I can't see any other short circuit in the whole motherboard.
When I charge the console, it seems to be charging: I get 15 volts and an amperage of 0.450 A.
Then, after a while, the amperage increases to 1.1 A and the BQ24193 charging chip starts to heat up, as evidenced... -
For Badcaps Readers, Please note that I am hopefully going to present this same message to Lenovo to see if they have any insight to the matter as well and figured to share the entirety here for clarification. The System is out of warranty as it is but does have the option to have it extended.
Model Information: T14 Gen 2 (Type 20XK, 20XL) Laptop (ThinkPad) - Type 20XK - Model 20XK0069US
Board: T14 Gen 2 (Type 20XK, 20XL) - Type 20XK.
System Hardware:
Processor: AMD Ryzen 7 PRO 5850U
Memory: 1x 16GB DDR4 3200 (Soldered on Board); 1x Crucial 32GB DDR4...09-08-2025, 10:46 PM -
Hello,
i have similar problem as https://www.badcaps.net/forum/showthread.php?t=37828
QUOTED
-It works on charger (without battery connected-only charger)
-It works on battery (without charger connected-only battery)
-& it also works when plugged in battery & charger, but it's not charging the battery
//Confirming, i have same issue, but problem started from charger, centre PIN is outputing 10V+ and jumping randomly 19V
and..
QUOTE
The IC cannot maintain the input current level... -
1. Some theory
1.1. Introduction
Almost every laptop has a charging circuit of some sort, that does a few things:- Manages switching between AC adapter and battery power
- Manages battery charging and generates power rail to charge battery
There are 2 different designs to handle switching between AC adapter and battery power and feeding the system:- Hybrid power boost (HPB) and traditional circuits without power boost (see Warning in HPB section)
- Narrow VDC (NVDC)
Texas instrument has a nice overview of these technologies with some more details at https:...
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