Growtopia Jaw
Member
Last Activity: 12-05-2024, 11:40 PM
Joined: 08-07-2023
Location: Kiamsam
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Sorry for the really long wait. I've ordered the chips SY8288BRAC_QFN20_3X3 (PU301) and SY8288CRAC_QFN20_3X3 (PU502) as recommended and it took about 2 months to arrive. Just had it soldered on just now (PU301). I haven't soldered on PU502 yet....
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PU502:
pin #14 = 0V
pin #15 = 4.9VLeave a comment:
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I measured PU501 like this, meter in DCV mode -> turn on and connect adapter -> black probe on GND -> red on pin #9 PU501. I've also measured the same linked lines of pin #9 just to confirm whether the readings are consistent (See yellow marked box below for same lines of PU501's pin #9). As before, I got "No reading" for said pin.
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3206183}[/ATTACH] Original unedited image: [ATTACH=JSON]{"data-align":"none","data-size":"small","data-attachmentid":3206184}[/ATTACH]...Leave a comment:
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PU301:
pin #17 to GND = 24.95k ohms
Sorry, by "No reading", I meant to say that the values are "floating" like when digital multimeters aren't connected to anything and the values just float around sometimes in the positive and negatives. Simply put that the probes aren't getting any values from the connection sort of like an "open circuit".
When I get a 0V measurement, the display will hold at 0V at least for a few seconds and respond to changes whenever I lift up the positive / negative probe to indicate they are really 0V.
...Leave a comment:
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pin #3, #4 = 0V
pin #31, #32 = 19.63V
PU301:
pin #1 = No reading
pin #2, #3, #4, #5 = 19.63V
pin #6, #19, #20 = 0V
pin #9 = 0V
pin #11 = 4.5V
pin #12 = No reading
pin #13 = No reading
pin #14 = 0V
pin #17 = 0V
PU501:
pin #1 = 19.63V
pin #2, #12 = 0V
pin #4 = 0V
pin #5 = 4.5V
pin #6 = 0V
pin #7 = No reading
pin #8 = 0V
pin #9 = No reading
pin #10 = No reading
pin #13 = 0VLeave a comment:
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Unfortunately no, I can just short the pins on the keyboard connector to turn on this motherboard but there is no response and the fan does not spin.
All coils are still 0V....Leave a comment:
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PUB1:
pin #1 = 19.63V
pin #2 = 3.227V
pin #18 = 18.96V
pin #30 = 24.8VLeave a comment:
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I've reapplied solder on the charging IC pins and they now look fine on all four sides. I'm now getting 5.32V on both pin #19 and #20.
Yes, I'm using the same factory adapter that came with the laptop itself from the beginning of this thread. Unfortunately, I don't have any other adapter that has the same barrel plug size even though they have the same output voltage but slightly different amps. I had thought of maybe swapping the female barrel jacks but unfortunately the connector size on the motherboard is different. The other adapters are all ASUS which for the negative conductor...Leave a comment:
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Getting 3.936V on VDD_CHG and 49mV on AC_IN
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3205746}[/ATTACH]Getting 3.936V on VDD_CHG and 49mV on AC_IN
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3205746}[/ATTACH]...Leave a comment:
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I got 110k ohm on VDD pin #19 to GND.
I've removed both resistors PRB8 and PRB9 and it looks like I'm only getting a few millivolts on both PRB8 and PRB9 resistor pads.
Edit: 5.8mV on CMSRC_CHG
8.6V on +19V_P1
0V on ASGATE_CHG
No reading on N16860566
I'm not sure why I'm getting inconsistent readings on all four of the pads. The values shift sometimes and just to make sure it isn't the probe's fault, I crossed both probes and am getting 0V which should indicate the probes are working fine.
[ATTACH=JSON]{"alt":"Click...Leave a comment:
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I've soldered on a new charging IC.
ACIN / pin #1 = 2.308V
ACOK / pin #2 = 49mV
DCIN / pin #18 = 19.28V
VDD / pin #19 = 3.95V
ASGATE / pin #30 = 0VLeave a comment:
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Looks like everything became 0V other than a few like
ACIN / pin #1 = 2.308V
DCIN / pin #18 = 19.28V
ACOK / pin #2 = 0V
ASGATE / pin #30 = 0V
VDD / pin #19 = 0V
Seems like I burnt the charging IC. Luckily I've bought spares and have around 5 of them. Might be back tomorrow after soldering the charging ICLeave a comment:
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I might've accidentally shorted the pins between #17 and #18 / #18 and #19 due to the leads being too big. It released a little smoke and I've put a stapler piece in place temporarily for the red probe to make the leads smaller.
Not sure which pins are ACDRV and REGN. I don't see it in schematics and boardview.Leave a comment:
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Sorry, I got confused between ACIN and ACIN_CHG.
ACIN aka pin #1 is 2.308V
ACOK aka pin #2 is 49mV
Main voltage rail is 19.63V
Didn't manage to measure pin #18.
Unfortunately I burnt something while measuring DCIN on pin #18.Leave a comment:
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Got 49mV on ACIN.
Edit: Got confused between pins. Correct voltages below.Leave a comment:
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I'm back with a Kyoritsu Model 1009 DMM.
PRB7: 0.485M ohm
PRB11: 64.8k ohmLeave a comment:
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I'll try to obtain a digital multimeter. In the meantime, here is the photo as requested
PRB7:
[URL=filedata/fetch?filedataid=325098][ATTACH=JSON]{"data-align":"none","data-size":"small","data-attachmentid":3183064}[/ATTACH][/URL]
PRB11:
[ATTACH=JSON]{"data-align":"none","data-size":"small","data-attachmentid":3183065}[/ATTACH] I'll try to obtain a digital multimeter. In the meantime, here is the photo as requested
PRB7:
...Leave a comment:
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I have an analog Sanwa YX360TRF multimeter and if not mistaken, according to its spec sheet
[ATTACH=JSON]{"alt":"Click image for larger version Name:\timage.png Views:\t0 Size:\t907 Bytes ID:\t3183051","data-align":"none","data-attachmentid":"3183051","data-size":"full","title":"image.png"}[/ATTACH]
source: [URL="https://overseas.sanwa-meter.co.jp/products/analog_multitester/yx360trf.html"]YX360TRF | Sanwa Electric Instrument Co., Ltd. (sanwa-meter.co.jp)[/URL]...Last edited by Growtopia Jaw; 01-21-2024, 09:13 AM.Leave a comment:
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I've took measurements of PRB7 and PRB11. I got
PRB7: 450k ohm in 100k range
PRB11: 60k ohm in 100k range
PRB7: 90k ohm in 1k range
PRB11: 65k ohm in 1k range
both doesn't make sense when put into digikey voltage divider calculator since they are 2.24V and 7.97V respectively whereas when measured directly in ACIN pin it's still 1.8VLast edited by Growtopia Jaw; 01-21-2024, 09:01 AM.Leave a comment:
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ACIN - 1.8V
DCIN - 19V
ACOK - 0VLeave a comment:
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