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Lenovo PhonesK8 [XT1902] Smartphones
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72 Posts

08-28-2019

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop (SOLVED - Bake the Motherboard inside the Oven)

2019-09-04, 5:44 AM

Yes Convection mode and at 230 C, normally the solder melts between 180 - 230 C, we dont know what type of solder composition is used hence using the higher temperature will make sure the solder melts properly and regains the lost connection. Also if you set the temperature in oven to 230 C the chances are that its slightly lower than that due to the losses and inefficiency of the equipment. i would suggest min 215 and max 250 C. BUT MAKE SURE TO REMOVE ALL THE FLEXIBLE RIBBON CABLES, FRONT AND BACK CAMERAS, RUBBER SLEEVES FROM THE 3.5 MM HEADPHONE JACK, MIC, PLASTIC LENSE FROM SELFIE FLASH OTHERWISE IT WILL MELT. FEW PEOPLE HAVE FORGETEN TO REMOVE THEIER SELFIE CAMERA AND IT COMPLETELY DAMAGED IT, I SHOULDNT BE HELD RESPONSIBLE.

 

If the phone is working dont try anything. But i highly doubt it would work long enough, the moment you put load on the CPU it will heat and the internal connection will break forcing it to hang and boot loop. For permanent 100% solution baking the motherboard is the only solution as i have been using it since 8 days now and it hasnt restarted or boot loop even once. Also since i have applied thermal paste on the CPU and other components now the phone operating temperature has lowered down. During ideling its arround 28-30 and when i am using it for general daily purpose usage such as youtube, whats app and browsing the temperature stays between 32-35 celsius.

 

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66 Posts

08-23-2017

India

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop (SOLVED - Bake the Motherboard inside the Oven)

2019-09-04, 5:57 AM

Yesterday it started bootlooping when I turned on apps, wifi and other stuffs.. So the problem still persists... I'll try follow what you mentioned.. Only afraid that may fry some other chips and ICs...

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08-28-2019

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop

2019-09-05, 3:13 AM

This is a common disease of Android phones, using CWM to solve: simultaneously press and hold the power, the volume is turned up and the home button to open the CWM recovery mode. (The entry method varies depending on the device. Refer to the manual for specific operations.) <Use the volume button to select the “Advanced” option <Press the power button to confirm <Select the “Dustvik cache” under the advanced menu <Return to select “Mounts and Storage” and click "Wipe / Cache" option <Back to the recovery mode home page, select "Reboot system immediately" <Complete the repair of Lenovo boot loop.

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72 Posts

08-28-2019

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop

2019-09-06, 3:17 AM
This is not a Software problem but a Motherboard issue, there are some loose connections on the motherboard IC's due to constant heating effect. When we bake the board in oven than all the solder joints melts and reconnects and forms a solid connection. I would suggest you to apply thermal past on the CPU and other IC's in order to bring down the temperature so that this issue doesn't reoccur.
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72 Posts

08-28-2019

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop (SOLVED - Bake the Motherboard inside the Oven)

2019-09-06, 3:23 AM

The components are rated to much higher temperatures only the plastic and rubber items needs to be removed otherwise they would melt, below is the checklist of items you need to remove before proceeding with baking
1) Remove Flex cable for Volume, Battery, USB Charging board, LCD and Digitizer

2) Remove Front and Back Cameras from the motherboard.

3) Remove Rubber Housing on 3.5mm head phone jack and Microphone

4) Remove plastic diffuser/blur lens from the selfie camera (you can easily forget to remove this as it looks part of mother board and it will melt the when bake)

 

Dont worry and just go ahead with the baking ......it will certainly fix the issue of constant boot loop/restarting. The fix will generaly last you through out the remaining life span of the phone untill you decide to change it.

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1 Posts

09-10-2019

India

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Re: Lenovo K8 Note Auto Restart

2019-09-10, 19:03 PM

I am not getting reboot in safe mode option when pressed and hold the power button

 

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72 Posts

08-28-2019

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Re: Lenovo K8 Note Auto Restart

2019-09-11, 13:05 PM

There is no reboot option in safe mode. Power down the phone and then restart it normally but pressing the power button.

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7 Posts

09-13-2019

India

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop (SOLVED - Bake the Motherboard inside the Oven)

2019-09-13, 3:31 AM

Hi, Brother.

 

First of all i would love to say that-

U R UNBELIEVABLE !!

 

Coming to the point 

as  i have been facing the same issue with the bootloop , suddenly restarting the phone during use ,

i googled and do everything as much possible like,

 

Factory data reset

Hard reset

Firmware change with SP Flash tool

Downgraded to Nougat 

 

None of them worked for me,

i saw your post related to this issue and now i want to do this,

but i would like to know about the HEAT SINK COMPOUND ??

 

WHERE IT IS AVAILABLE AND HOW TO APPLY IT ?

 

THANKS ALREADY.

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72 Posts

08-28-2019

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop (SOLVED - Bake the Motherboard inside the Oven)

2019-09-13, 4:19 AM

You can buy the heat sink compound from local electronic parts shop or even buy online from the below link, its not very important to have it in the first place as its for mitigating the same issue in future. To start with this concept of repair you should first bake it and see if the problem of restart has been resolved. Once its been resolved then you can buy the heat sink compound and apply on the IC/CPU to increase the heat spread and lower the operating temperature of the CPU.

 

https://www.amazon.in/Electronicspices-Thermal-Paste-Compound-Grease/dp/B07Q46QKML?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=_k_Cj0KCQjw2efrBRD3ARIsAEnt0ej0JdDAaje-BCVIXnCtt4gSWQ_P2LRXHn_VoBbMO8BmiELKV0HESyEaAqirEALw_wcB_k_&gclid=Cj0KCQjw2efrBRD3ARIsAEnt0ej0JdDAaje-BCVIXnCtt4gSWQ_P2LRXHn_VoBbMO8BmiELKV0HESyEaAqirEALw_wcB

 

https://www.flipkart.com/river-fox-thermal-grease-paste-heat-sink-compound-carbon-based/p/itmfh9kztzvpqkze?pid=TRPFH8EDHR9CWXKH&lid=LSTTRPFH8EDHR9CWXKHZCW1PE&marketplace=FLIPKART&cmpid=content_thermal-paste_8965229628_gmc

 

also i have attached some photographs about how to apply heat sink compound check out the file Lenovo K8 Note Motherboard.pdf

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72 Posts

08-28-2019

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Re: Lenovo K8 Note - Auto Restart issue/Boot Loop (SOLVED - Bake the Motherboard inside the Oven)

2019-09-13, 11:50 AM

Please watch this Youtube video to solve the restart / Bootloop problem

 

https://www.youtube.com/watch?v=0m630BisNMU

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