dell latitude 2100 no power

会员1002445

Dear friends,,,

today i m sharing delllatitude 2100 [quanta zm1]

actually when switchedon laptop its getting pulse and within second its off......

attached power supplyand its take 0.002 amps then switched on laptop its take 0.439 amps and off...

on pu1 [max 17020]

vin pin =17v ,, ldo=  0v, vcc andvdd =0v,,  ref =0v,,  but +3.3V_RTC_LDO = 3.3v

on i/o chipPOWER_SW_IN# 2.73v and its also on power switchbut when switched on laptop itson and off

now reprogram bios butstill same

then change max 17020but still same problem...

so i have checked itall signal and voltages...

               >    LDO its 0v butwhenswitched on its 5v and within second its 0v

              >    VCC &VDD  its 0v but when switched on its 5v and withinsecond its 0v

              >   PL5  its 0v but when switched on its 5v and withinsecond its 0v

              >   PL6  its 0v but when switched on its 3.3v andwithin second its 0v

              >   REF  its 0v but when switched on its 1.99v andwithin second its 0v

              >    +5V_EN1&+3.3V_EN2  its 0v but when switched onits 3.3v and within second

THEN  on i/ochip

               >   ALWON   its 0v but when switched on its 3.3v andwithin second its 0v

              >   SIO_PWRBTN# its0v but whenswitched on its 3.3v and within second its 0v

              >  ICH_RSMRST#  its 0v but when switched on its 3.3v andwithinsecond its 0v

              >   SIO_SLP_S3#   its 0v but when switched on its 3.3v andwithin second its 0v

              >   SIO_SLP_S5#    its 0v but when switched on its 3.3v andwithin second its 0v

               >  SUS_ON  its 0v but when switched on its 3.3v andwithin secondits 0v

              >   SUSPWROK     its 0v but when switched on its 3.3v andwithin second its 0v

              >  ALW_PWRGD_3V_5V  its 0v but whenswitched on its 3.3vand within second its 0v

              >  1.05V_VCCP_PWRGD  its 0v but when switched on its 3.3vandwithin second its 0v

              >   RUN ON  its 0v but when switched on its 3.3v andwithin second its 0v

              

Then check allregulator section getting accurate voltages depend on its require..

last and finally oni/o chip ACAV_IN = 0v when switched on its also 0v and its comingfrom charging ic pu3 [max8731a]

in this case  ACAV_IN  is important signal of chargingic to i/o chip but I m missing to check that signal bcoz of laptop gettingpulse and off so I don’t think about this signal…

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anyway it is goodexperience for me …I hope you will like this case study….

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会员513420

ACAV_IN  爆掉。。明白了

会员1113868

说实话看起来头晕 只有找网页翻译