Re: Lenovo ideapad 1 14|GL05 No display
The main power IC here is BD2670MWV. What are the essential signals and voltages I have to check to figure out why VCCGI_DRVEN is not high? Really complicated issue for a beginner....
senakahks
Member
Last Activity: 09-25-2023, 12:42 AM
Joined: 05-23-2020
Location: Auckland
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Re: Lenovo ideapad 1 14|GL05 No display
PL5103: 1.8V
PL5001: 1.05V
PL5002: 1.05V
PL5003: 1.05V
PL5004: 1.05V
Normally I took all reading while the battery and main power are connected.
No ram slots and all are onboard other than WLAN card.
Appreciate your time....Leave a comment:
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Re: Lenovo ideapad 1 14|GL05 No display
I checked the voltages again.
My bad PMIC_EN is 3.24V
Pin 30: 1.5V
PCH_PWRGD: 2.7V...Leave a comment:
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Re: Lenovo ideapad 1 14|GL05 No display
ALL_SYS_PWRGD: 2.8V
PCH_PWROK: 2.7V
Are these values acceptable as 3.3V?Leave a comment:
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Re: Lenovo ideapad 1 14|GL05 No display
Some other reading I got is given below. I took them since there are test pads near the power management chip
May be useful for an expert to advise me.
ALL_SYS_PWRGD: 2.8V
At BD2761MWV
PCH_PWROK: 2.7V
RSMRST_B: 3.3V
PWR_EXTMODE: 0V
PWR_EXTMODE2: 0V
SLP_S0_B: 3.3V
SLP_S3_B: 3.3V
PMIC_EN: 0V
PWR_DATA: 1.8V
PWR_CLK: 1.8V
PWR_IRQ_B: 1.8V
VCCGI_CSP: 0V
VCCGI_DRIVEN: 0V
VCCGI_FBN: 0V
VCCGI_FBP: 0V...Leave a comment:
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Re: Lenovo ideapad 1 14|GL05 No display
PL4501 - 3.3V
PL4551 - 5V
PL4401 - 8.1V
PU5102 - 1.2V
PL4701 - 0V
Some other voltages were measured.
0D6V_S0 - 0.6V
1D05V_S0 - 1.05V
1D8V_S5 - 1.8V
1D2V_S5 - 1.05V...Leave a comment:
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Re: Lenovo ideapad 1 14|GL05 No display
I tried to locate U9 to check whether I can read the number. Can you please send a photo of the location?...Leave a comment:
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Re: Lenovo ideapad 1 14|GL05 No display
Resistance to the ground is 205 Ohms.
An Image of the motherboard and schematic are attached herewith.
MOD Edit: Schematic -> https://www.badcaps.net/forum/showthread.php?p=1261114
Reminder: rules and organization of this section -> https://www.badcaps.net/forum/showthread.php?t=117483
....Last edited by SMDFlea; 08-11-2023, 01:56 AM.Leave a comment:
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Wistron LS1511G Schematic
Wistron LS1511G Schematic...Last edited by SMDFlea; 08-11-2023, 01:54 AM. -
Lenovo ideapad 1 14|GL05 No display
I am trying to fix Lenovo ideapad 1 14|GL05 (Wistron LS1511G 19705-1M).
When I press the power button its bulb turns on. But no display. When I keep the button pressed for a while. It goes off.
I have the following rails working
3.3V
5V
1.2V
The big coil (PL4701) which should be the CPU power supply doesn't produce any voltage. 19V is coming to the MOSFET.
The microprocessor is not getting warm and no display. Is bios signal needed to power on CPU/GPU vcore?
I flashed the bios but had no success. Please... -
Samsung UA55HU7000 TV: HAVDD missing
I am working with a Samsung UA55HU7000 TV and backlight and sound works (volume up and down sound checked). But no picture. T-Con was replaced with a new one and still the result is same. Even with the old T-Con and new T-Con found that some voltages are missing. I feel the heat of main IC of the T-Con.
HAVDD: 0V
AVDD: 0V
VCC3.3: 3.3V
VCC 1.15: 1.1V
What can be further investigates. Appreciate any support. -
Lenavo Yoga 720: Is 7 Ohms a Vcore short to ground?
I am trying to fix a Lenavo Yoga 720. The buck converter near CPU shows 7Ohms short to ground. No schematic and I guess that is CPU VCore. Is is something normal? -
Macbook 820-2915 (A1286) White Screen after apple logo
Dear All,
I have a problem which results white screen while loading with apple logo. Found in internet that it is a failure of C9560 which needed for PP1V5_GPU_REG.
I checked the voltage of PP1V5_GPU_REG and it is 1.36V
Removed C9560 and capacity is 250 uF.
Original values should be
PP1V5_GPU_REG: 1.36V
C9560: 220uF
Even after removing C9560 the voltage of PP1V5_GPU_REG is 1.36.
Any idea to go ahead? -
Re: HP Pavillon G- Fan error (90B)
3 wire fanLeave a comment:
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HP Pavillon G- Fan error (90B)
I trying to fix a l HP Pavillon G which gives the error message 90B fan error.
Fan is slowly running for about 2 seconds and stop about 2 seconds. that runs as a cycle. What could be the problem.
No much dust and connector has no problem. -
Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0
Yes. That is what I am using now.
What can I check for missing PM_SLP_S4_L?Leave a comment:
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Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0
The charger I have used is a 15V one. So, once charger is changed, SYS_ONEWIRE gives 3.3V
Still no luck with FANLast edited by senakahks; 08-24-2020, 06:54 PM.Leave a comment:
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Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0
Some voltages may be useful:
PM_PWRBTN_L: 3.4V
SMC_ONOFF_L: 3.4V
PM_SLP_S4_L: 0V
When trigger SMC_ONOFF_L, PM_PWRBTN_L goes down and come up.Last edited by senakahks; 08-24-2020, 06:47 PM.Leave a comment:
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Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0
Tried to trigger by touching the ground to SMC_ONOFF_L. Fan doesn't move at all.Leave a comment:
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Re: 820-2533 Macbook Pro - SYS_ONEWIRE: 0
Now SYS_ONEWIRE: 2.8V
Green Light is ON
S3 rails are not active yet.Last edited by senakahks; 08-24-2020, 04:13 AM.Leave a comment:
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