Kshi
Member
Last Activity: Today, 07:57 AM
Joined: 08-04-2024
Location: Quezon City
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Ordered new charging IC, I will update you guys when I replaced it. Thank you for helping me -
PR311 reading is 65Kohms
in ground 95K ohms in both legs...Leave a comment:
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Sorry for the confusion on my post. +3VLP and +19VP were present before I found a jumper wire below the first mosfet. I replaced the mosfet, and now 19V is not passing through the first mosfet. The problem I have now.
I use mdu1511 to replace EMB04N03H. I don't really think if this is compatible.
I attached value of each mosfets
The resistance of PR304 is 0 ohm, and PR305 is 1.5 ohm. The measurement of VDD to ground is 90k ohms.
Is it that one of the resistors is faulty?...Leave a comment:
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this is the measurement i got on charging ic
ACIN_CHG 4.50v
AC_IN 0.05v
EC_SMB_DA1 0.02v
EC_SMB_CK1 0v
N16860695 0v
AMON_ISL955 0v
BMON_ISL955 0v
N16860688 0v
PROG_CHG 0v
COMP_CHG 0v
CCLIM_CHG 1.6v
FSET_CHG 0v
N16860560 0v
CSON_CHG 0v
CSOP_CHG 0v
ACLIM_CHG 1.3
N16860799 0.92v
N16860474 18.7v
VDD_CHG 5.2v
VDDP_CHG 5.2v
LG_CHG 0v
LX_CHG 0v but sometimes unstalbe 3v to 0v
UG CHG 0.6v
BST_CHG 4.8v
BGATE_CHG 4.2v
VBAT_CHG 0v
OPCP_CHG 4.8v...Leave a comment:
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Its manual select 2m,200k,2k,200 I tried all settings but not measuring any
tried to remove 1st mosfet on donor board and i got readings on itLeave a comment:
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After removing pq311 I get ol in ohms measurement of all s&d s&g g&d pins
but in diode mode the measurement of souce and gate is 400
I remove pq310 same pinout measurement but in diode mode of g&s is 400
is this normal? Or shoul i have value of the pinout in ohms modeLeave a comment:
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Pq 310
source & drain 400
source & gate 500
gate & drain ol
PQ311
source & drain 450ohms
source & gate 500ohms
gate & drain ol
Leave a comment:
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Acer a515-52g no power 19v not passing through first mosfet
I purchased this laptop from fb marketplace
and the previous tech jumped 1st mosfet. maybe it got fix, then time comes by jumpering fried the charging ic?
tried to change mosfet but it does nothing 19v is not passing through 1st mosfet
tried to jumper again, I got 5vlp and 3vlp but 5valw and 3valw is missing
I suspect that the charging ic is bad? If so how do i test if it is bad.
Cant see any short or corrosions on board
schematic and brd view attached below... -
I remove the 2nd mosfet and it seems to be working fine, this what im getting now without it
PQ311
Source ol
Gate ol
Drain 4.5k
I think one of this mosfets is the problem?
PQ312
Source 520k
Gate ol
Drain 4.5k
PQ305
Source 520k
Gate 520k
Drain 4.5k
or the charging ic is broken?Leave a comment:
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This is the measurement i got at PQ311
Source- ol
Gate- ol
Drain- 4.5kohms
1st mosfet is
Source- ol
Gate- ol
drain- 330kohms...Leave a comment:
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So I test the 1st mosfet source and drain and i found that is short so i remove it and found a jumper wire below the chip.
I replaced the 1st mosfet but now i get
Drain 19v
source 0v
gate 0v
maybe the charging ic is busted because of jumper on first mosfet?Leave a comment:
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acer a515-52g-4830 5valw 3valw missing
hello,
this is my third time trying to revive dead laptops.
I got this acer does not have power light
First I test
dc 19v-ok but +5valw and +3valw is missing
i remove the board to test more but i didnt find anything
no shorts no corrosion
but i get +3vlp and +5vlp present
and now i dont know what to do anymore
hope someone can help me and improve my skill
Link to schematic - https://www.badcaps.net/forum/troubl...nd-mobile-devi...Last edited by SMDFlea; 07-25-2025, 03:21 AM. Reason: https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/83799-acer-a515-52-la-g521p-schematic-n
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