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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Hello everyone
Small technical problem on a Nintendo Switch lite
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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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