mcplslg123
Badcaps Legend
Last Activity: Today, 03:46 AM
Joined: 06-01-2015
Location: siliguri
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Yes, unless you want to replace the SOC. -
Both +1.8V and +1.05V rails are enabled by PCH_PWR_EN which in turn is issued by SIO. It should be 3.3V and not 2.4-2.5V
Measure PCH_PWR_En on SIO pin-is it 2.4V there? If yes, remove PR506/507 one by one to see if it rises to 3.3V....Leave a comment:
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It could be for many many reasons like CPU/GPU/VRAM/Thermal issues.Leave a comment:
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ACOK/ACIN /HW_ACAVIN_NB status?
Charging ic pin1-2 connectivity to PR917 intact as per rated resistance value?
SDA/SCL communication on pin21/22 checked with DSO?
PQ1202/1213-gate voltage?Leave a comment:
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This a costly mobo and hence you should take comments at post#7 positively in your interest itself.
We're here to help you and not undermine your skills.
But think honestly if every laptop mb can be fixed in this forum ,How we professional people survive and get work?
Its always wiser to leave it to experts specially when stakes are high and knowledge/skills is not upto 100%....Leave a comment:
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Answer post#13 first.
We cant advise without proper feedback.Leave a comment:
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The dc jack light behaviour is perfetly normal for a probook.
The 3V/5V regulator is also behaving correctly as DSW is activated.
In summary, nothing wrong so far. Move ahead and check the mb for corrossion/liquid spill.
If nothing visible, check RSMRST#/ECRST# present or not?
have u checked RTC section?Leave a comment:
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This is not bios issue for sure. You already got the correct advice at post#5Leave a comment:
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Short on +3VLP coupled with short on +1.0V rail= Shorted SOC.Leave a comment:
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On newer gaming motherboards, usually only 5V should be present on the coil and 3V will be generated after pressing power switch.
Whats the mb part number?Any schematic available?Leave a comment:
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What is the point of circling some points on the pdf file without specifying what voltage is present or absent there?
Its wiser to mention all the enables/inputs along with outputs of this IC. this IC is a combination of multiple ic-so the info should be very detailed.
If anything is missing, its standard practice to check resistance to GND on that rail.
Overall, not much info to help you out.Leave a comment:
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+3VALW will come up only after triggering the mb as per power sequence but EC_ON should be present in off condition(seems contradictory to me).
Have you checked RTC circuit? Main bios flashed?
Have you checked resistance to GND on switched rails like +3VS/5VS etc.(Pg 78)?...Leave a comment:
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Yes, its very common for newer lenovo's to have cracked solder joints under SOC. the reason is solder used by lenovo.It melts at very low temparature compared to other brands.
So when the SOC heats up, the balls gets cracked underneath-A very usual feature with lenovo's.
I'm betting on this 'coz you have intermittent display. If you have BGA machine try to reflow it a bit(dont use hot air gun).
However, if my doubt is correct,then reflowing wont fix your issue as there is black glue underneath SOC. It needs reballing and thats not easy.
I just...Leave a comment:
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PL502 at 14 ohms is not correct.Should be close to 70-80 ohms.
Remove the core IC and check resistance to GND on VR_ON pin again. Is it same?
If yes, SOC is bad.Leave a comment:
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DSG-Drain-Source-GateLeave a comment:
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No one have it? have a liquid spill case with damaged tracks and resistors.
Any other similar boradview that can be used as reference?Leave a comment:
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WHEA error is mostly 'coz of bad SOC.. It'll work intermittently without issue 'coz of heat applied during repair process. has faced this on a couple of Asus/Dell. Only on one occassion, i got success by replacing SOC. Rest i gave up as i dont had same SOC to replace.Leave a comment:
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Remove the fuse and check resistance to GND on both pads of this fuse. Definitely one pad is shorted to GND and that's why when you put the fuse,19V is pulled to GND.
Its a simple issue and can be easily solved with some basic troubleshooting.Leave a comment:
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Remove the 2R2 resistor on pin 5 of this chip and measure resistance to GND on both pads of this resistor. Very likely the chip is damaged.Leave a comment:
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Since 5VALW/3VALW is presemt,EC_ON has to be there-so not an issue.
What about ECRST# and RSMRST#?Leave a comment:
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