[SOLVED]820-3662 dont turn on

Dozer

New member
hello, got this machine as liquid spill around the battery connector



the board dont looked nasty or something like that , only on the battery connector on battery side the markers are red and that one on the left top corner of the board, on that side where battery connector is


after press power button comes the red battery on the sceen, hats all.

i connected a good battery and it is working and charging , everything fine.

so i cleaned the board only with alcohol and set it back in the unit. after that it dont turn on. i heated with 100 grad celsius the area of the battery connector, after that it turn on one time.

now it dont turn on. no green light

i found 2 wholes in u7100, replaced that,

at first i found F7005 blown, after replaceing and blown again i found Q7130 and Q7135 are bad, replaced now.

now i have almost back my green/orange light.

but only 12.20V on L7130

so i checked the SDA and SCL lines of the smc, SDA line has 3.3V changing on oszyloscope it shows trafic

on the SCL line are only 1.7V, resistor ok and before resistor are 3.3V


the lines both have in diode mode somthing of .487

so i replaced D7050 ad have now on SCL 3.03 V but in oszyloscope only a flat line.

smc_reset_l is 3.3V

replacing SMC needfull? or some other ideas? need help please
 
Last edited:

dukefawks

Administrator
SMC or ISL are dead. ISL has been replaced so that leaves the SMC. Make sure there is no corrosion under the battery connector that can destroy another SMC.
 

Dozer

New member
thanks duke.

so would that a good idea for testing to lift off the ISL and check the i2c lines on the smc with the scope? ar that would be working without ISL?

the ISL was replaced before replacing D7050, could be damaged again?
 

dukefawks

Administrator
Nah, if you believe the ISL and D7050 are ok then there is only 1 option left and that is the SMC. Again make sure there is no crap under the battery connector!
 

Dozer

New member
ok, thanks. so i ordered now 2 junk boards in the hope one of them have a good smc and i will report back in about 2 weeks
 

Dozer

New member
so back on work with this board.

i replaced the smc from the donar board and now it is working good. i2c is comunicating, L7130 has 12.54V now.

i replaced the accu to be shure that it will not fail again.

SOLVED, thanks duke for your help.
 
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