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标题: dell latitude 2100 no power [打印本页]

作者: johncarter 时间: 2016-8-29 14:37
标题: dell latitude 2100 no power

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…

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

作者: H55 时间: 2016-8-29 15:55
ACAV_IN 爆掉。。明白了

作者: 兵哥数码 时间: 2016-8-29 16:13
说实话看起来头晕只有找网页翻译

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