help satellite c855 not working with batt.

[ala_borbe]

hello ppl

can you pls assist me?

i have satellite c855-1uu
pskcae
mb
PLF/PLR/CSF/CSR UMA MB
REV 2.1

H000050950

it works on DC but wont turn on or work on bat.. it instantly shuts off
i have tried it with another working bat, also tried this bat in another laptop, so batt is ok
no schematics found for this one

found no faulty mosfets...

it would be nice if someone posts 100% tested and working dump of bios, read in other thread that bios can be problem...
current ver
SYSTEM bios: 6.80
EC version : 1.70

pls guide me

[ala_borbe]

Re: help satellite c855 not working with batt.

i wanted to replace moset located near BATT con but i cannot identify it

AOR F8707

http://www.alldatasheet.com/view.jsp?Searchword=F8707

by markings should be P type mosfet, but datasheet says N type
need some substitution

help pls???

[ala_borbe]

Re: help satellite c855 not working with batt.

ok, not bios problem, found a way to flash official last version form toshiba support

attached here, may help others

any help from you guys? shed some light on me, not experienced as you, but learning

[highpulse]

Re: help satellite c855 not working with batt.

hum reedit didnt read well your post , well first of all cheked with schematic , if its a P channel type your gate must be near 0 or negative values , only that way it will make passage from drain to source .

Also chek charger ic for GATE signal as also LDOs

let us know pin result

[ala_borbe]

Re: help satellite c855 not working with batt.

do you happen to have schematic? i cant find one...

[highpulse]

Re: help satellite c855 not working with batt.

i dont have , but tell me , with battery on the laptop , chek and tell me what are the voltages on all pins of battery . you can measure on board solder points on directly on the battery pins .
also cheking visually chek the mosfet that will feed main line , chek source drain and gate and tell me , also let me know the model of the mosfet that feed battery and wich is the QFN for charger system

[ala_borbe]

Re: help satellite c855 not working with batt.

its hard for me to trace with schematics but il try

thank you very much for taking time and interest to help me!!!

this board have very little number of mosfets, checked all, found no shorts in diode mode nor resistance mode

no battery
main mosfet near dc jack
ior f8707
pin 1-3: 19.19v
pin 4: 24.65v
pin 5,6,7,8: 19.19v

same with battery

near it, smaller one
fds 8884 same voltage

no bat
near bat con
ior f8707
pin 1-3: 3.25v
pin 4: 3.25v
pin 5,6,7,8: 19.19v

with bat
ior f8707
pin 1-3: 0.44v
pin 4: 0.40v
pin 5,6,7,8: 19.19v

bat con, no bat
pin 1: 0v
pin 2: 0v
pin 3: 3.3v
pin 4: 3.3v
pin 5: 3.2v
pin 6: 0v
pin 7: 0v
pin 8: 3.2v
pin 9: 3.2v

with bat
pin 1: 0v
pin 2: 0v
pin 3: 3.2v
pin 4: 3.2v
pin 5: 0.2v - very different
pin 6: 0v
pin 7: 0.4v - very different
pin 8: 0.4v - very different
pin 9: 0.4v - very different

fuse near bat con when bat inserted 0.4v, if no bat 3.2v... no good, right? no power to bat :/

battery status blinks every 5-6 sec red color

i cant figure out what is charger... no markings on board, no schematics

but

[highpulse]

Re: help satellite c855 not working with batt.

well , if you tryed on another laptop and its working , then its surely a problem on dc detect circuit or charger circuit .

the mosfet you mention 8707 its a N channel so for it can provide passage from source to drain , gate must be positive , more or less voltage will be added to gate depending on how much voltage will be on the drain .

If you leave the battery charging , do you notice the 0.4 volts incresing in any way ? ir not , then there is a problem on SENSE signal on charger IC , not detecting or detecting anormality , if he detect anormality on the segment it will drive very few voltage for the gate making the computer not to charge battery , can you provide voltages on pins of the charger IC ?

[selmansanli]

Re: help satellite c855 not working with batt.

did you solve the problem? I can help you!

[crysisanu]

Re: help satellite c855 not working with batt.

Lenovo IdeaPad Y530 bios dump plz help

[erhanabdullah]

Re: help satellite c855 not working with batt.

ideapad Y530 rev 2.0 (08G2005FB20GLV) bios is here ..tested
http://dosya.co/qwj43cge80ay/ideapad...ginal.rar.html