SORRY I have just read your reply just this time, good news, i have replaced U8130 with a part from donor board. confirmed that U8130 is pulling my PM_RSMRST_L down. now after replacement, the voltage of all that i mention with 2.7v reading still same, macbook now running.
L7560 = 2.8V
L7520 = 5.1 V PP5VRS3
PM_SLP_S4 = 2.8 V
USB port has power, camera is working, wifi is ok. battery is charging. sleep mode is ok.
i will update again if there is a problem that will manifest.
thanks [USER="295753"]mon2[/USER] for the link. that helps...
jamesp
Senior Member
Last Activity: 04-19-2025, 02:28 AM
Joined: 03-10-2017
Location: cavite
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latest....found out PPDCIN_G3H_ISOL only has 15.5v but i can measure though a 3.42v on PP3V42. SAD i dont have other magsafe for verification. note that it is a original magsafe that i used. maybe this causes my 3.3v rail to have 2.7volt only of reading...Leave a comment:
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thats also i thought eventhough the chip has a minimum working voltage. the only correct voltage reading is PM_DSW_PWRGD which is i measured @ 3.42 v. all items in 11+1 checklist on the link that you gave me is 2.7v and the item no.6 i got a correct32khz clk. i will give another update, sorry o disturbed your sleep....Leave a comment:
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here is an update....@Mon2 and others
i followed this link [URL]https://www.it-tech.com.au/pm-slp-s4-l-timing/[/URL]
i have stopped at no.11 ...PM_RST_L is low , reading of 0v but pull-up resistor is ok at 100k and PP3V_SUS has 2.7 volts.
pls. see attached diagram with my readings
also checked for shorted to gnd on that signal PM_RST_L but ok not shorted. so probably i should jump to conclusion that it is the chip U8130 is the culprit as datasheet tells us that MR pin is high and threshold voltage is within the design....PIN 6 SHOULD have a high reading and not zero....Leave a comment:
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wow, thank you very much for the link, its very informative, i might sleep now and do this tomorrow morning. its past midnight here in our place. i will share some update as quickly as i can. thanks again....Leave a comment:
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PPBUS_G3H reads 8.4vdc and both SCL AND SDA line on battery connector are logic high 3v , my friend who owns this laptop said there is accedental water spill on this long time ago but wait a week before trying to power up, and voila...problem occurs. through my scope theres no visible water damaged observed. i only stuck at the PM_SLP_S4_L signal. btw....letter L in signal name means Low?? if it does, maybe i should not expect a high logic value on this pin, am i wrong ? whats your idea on this? if this signal comes from CPU U0500, what other signal that triggers this cpu to give a logic high...Leave a comment:
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PM_PWRBTN_L has a reading of 3v and pulled down as i press the pwr switch button on keyboard, when released it goes high again...Leave a comment:
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i am stuck at 0v on PM_SLP_S4_L , PPBUS_G3H is stable, i also have reading of 3.42 on OO3V42_G3H, And yes i am using oem pwr adapter...Leave a comment:
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yes thanks, i am at S4 stage where i can get no voltage reading that will enable the u7501 chip, and that PM_SLP_S4 comes from U0500 chip...Leave a comment:
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NEED help with my a1466 macbook with mb 820-00165-a
problem is no voltage reading both pins of R7551 to send enable signal for pin 4 and will result to PP5V_S4RS3, measured L7520 indcutor for possible short to gnd but none have found. i watch yt videos of louiss rossman and he said before replacing U7501 we must check first PM_SLP_S4_L , and i did check but nothing i measured. is it correct to conclude that U0500 chip is the culprit? i checked also the PM_SLP_S4_L line and no short found. pls. help thanksLeave a comment:
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soyy, i am not familiar, what is MBD?...Leave a comment:
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same result, Dead MB....Leave a comment:
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thanks, i will post my result here...Leave a comment:
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ah yes, i have tried also on my RT809H just to be sure, attached here is the 32 mb backup from rt809h. i just thought that TL866CS can read it properly though it finished reading the bios chip it only results in a 16mb bin file.
so thats it, my backup file via RT809 was attached here. sorry if i done it wrong the previous post.
the chip is a W25Q256FV...Leave a comment:
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Thanks for the response, but that is the only bios backup obtained from reading the bios chip thru TL866CS.
do you mean the EC bios?...Leave a comment:
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Please Help, i need my Bios to be fix.
Model is Latitude 3420 with service tag G5ZQ1B3. mainboard is CYBORG-L14 TGL-203068-1
Problem is laptop not powering ON, MBIS cant perform...Leave a comment:
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Acer Aspire A315-55 Dead mainboard
Hello, can someone please help me. i have a dead laptop mainboard, aspire a315-55 with board model DA0ZAWMB8G0 rev. G
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need help, i have a laptop that i encountered having keyboard and touchpad not working, not immediately going to BIOS i already tried replacing even just the keyboard with a new one but still problem exists. now i only realized to checked it from bios to erase doubts. i found out both touchpad and keyboard are working only on BIOS but not on windows.
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Thanks for the enlightenment. i misunderstood this until you response. so i should be looking for an edp type panel 30 pin from my stack of panels....Leave a comment:
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Hello Guys, can you lend me a helping info out here...
sometime ago i teardown my ASUS X550LC laptop because of not powering up, 19v rail was missing. to make long story short, i was able to repair my board, problem is...i have mixed up my lcd panel to my spare of lcd panels in my table and i am confused which is which. all of them not working including the supposed to be my original lcd for this laptop. i cant test all of my panels because some of them are edp type and my lcd tester on hand is for LVDS Type only. my final solution is to buy a new one for this but dont know what is the exact...
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