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Old 08-24-2013, 10:39 AM   #1
guruji
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Default dell inspiron L502X NO POWER

hello,
i have a dell insp l502x board no quanta DA0GM6C i have only stdy voltage +3.3v coming from tps51427 dc/dc the +5v is absent due to alw_on signal not there.i have checked the 3.3v login power on no problem there changed the micom ite8518e. I have doubts with the ec bios can anyone upload the dump for it.also does the ALW_ON come from the micom after power switch pressed or it is present always.anyone faced power issue with this laptop. pls helpp
thanks
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Old 08-25-2013, 08:24 AM   #2
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Default Re: dell inspiron L502X NO POWER

i have the same computer with bios password . i can upload the ec dump . will do it tomorrow but i need also yours (4Mb spi rom dump and 512kb ec dump)
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Old 08-25-2013, 09:54 AM   #3
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Default Re: dell inspiron L502X NO POWER

no problem does yours power on i will anyways upload for you the bios and ec pls check and let me know.
thanks
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Old 08-25-2013, 12:30 PM   #4
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Default Re: dell inspiron L502X NO POWER

yes mine is working .just password on boot
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Old 08-26-2013, 01:21 AM   #5
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Default Re: dell inspiron L502X NO POWER

today will dismantle mine and will let you know If alw_on is always present or come after pressing power button .
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Old 08-26-2013, 02:05 AM   #6
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Default Re: dell inspiron L502X NO POWER

ok thanks meanwhile i am attaching the bios and ec.this one is without password but pls check the bios and tell me.
Attached Files
File Type: rar DAGM6CMB8D0_DELL-L502X_BIOS.rar (2.07 MB, 117 views)
File Type: rar DAGM6CMB8D0_DELL-L502X_EC.rar (50.8 KB, 66 views)
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Old 08-26-2013, 02:15 AM   #7
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Default Re: dell inspiron L502X NO POWER

ok will let you know today
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Old 08-26-2013, 06:12 AM   #8
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Default Re: dell inspiron L502X NO POWER

wow wow wow wow wow wow wow wow wow wow wow wow wow it work fine the 4Mb dump thank you very very very very very very very very very much guruji thanks again.

now for your faulty board notice that the ALW_On is always present when you plug the adapter . before pressing the power switch button you must get 3.3v and 5v . i think if you don't have 5v you must check arrond coil if there are no short or the tps51427 is dead
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Old 08-26-2013, 06:30 AM   #9
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Default Re: dell inspiron L502X NO POWER

the ec dump is also good . sorry forgot to tell you
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Old 08-26-2013, 06:54 AM   #10
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Default Re: dell inspiron L502X NO POWER

okay that good pls can you click a good photo around the ite8515 as i think someone have removed some resistors. so i can see if any missin parts.
thanks
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Old 08-26-2013, 07:06 AM   #11
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Default Re: dell inspiron L502X NO POWER

do you have the diagram
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Old 08-26-2013, 07:12 AM   #12
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Default Re: dell inspiron L502X NO POWER

.
Attached Files
File Type: pdf QUANTA GM6C.pdf (1.10 MB, 75 views)
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Old 08-26-2013, 07:12 AM   #13
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Default Re: dell inspiron L502X NO POWER

yes i do have the schematics i am not getting alw_on does it come from the ec
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Old 08-26-2013, 07:19 AM   #14
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Default Re: dell inspiron L502X NO POWER

can you send me a photo of the components around ite8515e as i feel something missing
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Old 08-26-2013, 07:36 AM   #15
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Default Re: dell inspiron L502X NO POWER

have already screw the lapy. but notice that only with battery the alw_on signal come after tou press the power switch button . but with adapter the alw_on signal is already present when you plug it
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Old 08-26-2013, 07:42 AM   #16
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Default Re: dell inspiron L502X NO POWER

EC pin 83=alw_on = 3.3v
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Old 08-26-2013, 07:43 AM   #17
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Default Re: dell inspiron L502X NO POWER

ec=ite8518 not ite8515
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Old 08-26-2013, 08:16 AM   #18
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Default Re: dell inspiron L502X NO POWER

tps51427=isl6237=rt8206b
first check ONLDO signal pin4 of tps51427 onldo=+PWR_src*(pr122)/(pr121+pr122)

then check LDO signal pin7 of tps 51427 LDO=+5v_ALW2

the LDO signal activate +3.3_en1 an +5_en2 to provide +3.3v_ALW and +5_ALW
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Old 08-26-2013, 12:03 PM   #19
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Default Re: dell inspiron L502X NO POWER

Hi i have replaced the tps51427 also a new micom ic.i get all the voltages accept the +5v alwp.will check if there is a short in the 15v-alw.will check tomo anyhow
Thanks again for your help.
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Old 11-09-2013, 10:56 AM   #20
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Default Re: dell inspiron L502X NO POWER

thanks dycc , guruji for sharing your files .
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