Hello The laptop had a damaged charging plug. was replaced. I have also measured the voltages at the point of contact with the motherboard are correct. The charger has been checked on another laptop and vice versa so I exclude it. The symptom is a complete lack of response to the power supply....

This is a CD under Leonovo (Intel i3-i7 IIIgen.) P / nr. 69N0B5M10A01 - Pegatron platform or something from Asus HM70 (Intel SJTNV) / sometimes HM76 KBC IT8528E FXA stby TPS51225C GPU chip (N14M-GE-B-A2) GT720M Measure the stba and LDO voltages (see datasheet), see if it warms up? Then take care - if you have a small resistance after LDO (it powers the NCB and Power button) it's 99% KBC to exchange Similar to G500

Incorrect socket replacement could lead to various faults. You do not write anything about the behavior of the power supply - if it has a light / diode, it does not dim after connection. Measure the resistance + of the power supply socket in relation to ground to the beginning - there is no short circuit. If it does not have to plug in the power supply and measure the voltage - do you have those around 19V on the power supply socket.

I have exactly the same problem TPS51225 warms up LDO3 - 3.36V to a mass of 3.4k Ω LDO5 - 5.19V to mass 23k Ω Maybe someone has a schematic of this CD or can send the page itself with the vicinity of TPS51225

Schema unavailable. Take the system off and give the appropriate voltage to the LDO pins from the service power supply and see what effect it has. Measure the resistances on the main transformer coils and pass along the keys.

Hello. TPS51225 is in the Acerach M series, PM50 platform, it may be helpful in the diagnosis, because the BAMBI (G700) and DUMBO2 (G710, Z710) schemes are nowhere to be seen. By the way, the slaughtered nest in these models results in damage to KBC ITE8528E.

I put in a new TPS51225 because I just had it at hand. There is no change, the laptop still does not react and warms up TPS51225 I think, just like piotrp26, that the NCB is damaged, I will replace it and it will turn out, I just have to wait for the package because I do not have one.

Lenovo G700 Laptop: Damaged Charging Plug Replaced, BAMBI Motherboard Rev 2.1, No Power Response

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#1 15110640 31 Oct 2015 13:56

marshal22 marshal22

Level 2
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Post #1
15110640 31 Oct 2015 13:56

Hello

The laptop had a damaged charging plug. was replaced. I have also measured the voltages at the point of contact with the motherboard are correct.
The charger has been checked on another laptop and vice versa so I exclude it.

The symptom is a complete lack of response to the power supply. The battery charging indicator or any warning sound is not on. Nothing squeals as in the posts already posted about this equipment.

A request for advice may be some kind of fuse that could burn out when you snatch the socket or some other item that needs to be checked - replaced.

BAMBI motherboard main board rev. 2.1

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#2 15110678 31 Oct 2015 14:16

miecho18 miecho18

IT specialist

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Post #2
15110678 31 Oct 2015 14:16

Plate designation enter.
#3 15111325 31 Oct 2015 18:23

lisek lisek

Service technician RTV

» | Helpful post? (+2)

Post #3
15111325 31 Oct 2015 18:23

This is a CD under Leonovo (Intel i3-i7 IIIgen.) P / nr. 69N0B5M10A01
- Pegatron platform or something from Asus
HM70 (Intel SJTNV) / sometimes HM76
KBC IT8528E FXA
stby TPS51225C
GPU chip (N14M-GE-B-A2) GT720M

Measure the stba and LDO voltages (see datasheet), see if it warms up?
Then take care
- if you have a small resistance after LDO (it powers the NCB and Power button) it's 99% KBC to exchange

Similar to G500
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#4 15111368 31 Oct 2015 18:38

sk1977 sk1977

Company Account
IT specialist

» | Helpful post? (0)

Post #4
15111368 31 Oct 2015 18:38

Incorrect socket replacement could lead to various faults. You do not write anything about the behavior of the power supply - if it has a light / diode, it does not dim after connection.
Measure the resistance + of the power supply socket in relation to ground to the beginning - there is no short circuit. If it does not have to plug in the power supply and measure the voltage - do you have those around 19V on the power supply socket.

Helpful post? Buy me a coffee.
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#5 15168043 20 Nov 2015 14:24

Balzat Balzat

Level 14

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Post #5
15168043 20 Nov 2015 14:24

I have exactly the same problem
TPS51225 warms up
LDO3 - 3.36V to a mass of 3.4k Ω
LDO5 - 5.19V to mass 23k Ω

Maybe someone has a schematic of this CD or can send the page itself with the vicinity of TPS51225
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#6 15168151 20 Nov 2015 15:14

boro1234567 boro1234567

IT specialist

» | Helpful post? (0)

Post #6
15168151 20 Nov 2015 15:14

Schema unavailable.
Take the system off and give the appropriate voltage to the LDO pins from the service power supply and see what effect it has.
Measure the resistances on the main transformer coils and pass along the keys.
#7 15172651 22 Nov 2015 00:14

piotrp26 piotrp26

Level 13

» | Helpful post? (+2)

Post #7
15172651 22 Nov 2015 00:14

Hello. TPS51225 is in the Acerach M series, PM50 platform, it may be helpful in the diagnosis, because the BAMBI (G700) and DUMBO2 (G710, Z710) schemes are nowhere to be seen. By the way, the slaughtered nest in these models results in damage to KBC ITE8528E.
#8 15183882 25 Nov 2015 15:07

Balzat Balzat

Level 14

» | Helpful post? (0)

Post #8
15183882 25 Nov 2015 15:07

I put in a new TPS51225 because I just had it at hand.
There is no change, the laptop still does not react and warms up TPS51225
I think, just like piotrp26, that the NCB is damaged, I will replace it and it will turn out, I just have to wait for the package because I do not have one.
#9 18461697 10 Feb 2020 11:19

bekirsalman bekirsalman

Level 8

Helpful post? (+1)

Post #9
18461697 10 Feb 2020 11:19

SCL SDA 3.3 V
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Topic summary

The Lenovo G700 laptop is experiencing a complete lack of power response after a damaged charging plug was replaced. The user confirmed correct voltage measurements at the motherboard contact points and ruled out the charger as the issue. Responses suggest checking the TPS51225 chip and LDO voltages, as well as measuring resistance at the power supply socket. There are indications that the KBC (ITE8528E) may be damaged due to the socket replacement. Some users have replaced the TPS51225 without success, leading to speculation about potential damage to the NCB. Schematic diagrams for the BAMBI motherboard (Rev 2.1) are not readily available, complicating troubleshooting efforts.
Summary generated by the language model.

Lenovo G700 Laptop: Damaged Charging Plug Replaced, BAMBI Motherboard Rev 2.1, No Power Response

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