Use the Vivo T1 In the Rain and Won’t Turn On

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The client uses the Vivo T1 in the rain and won’t turn on after that. Let’s see the detailed troubleshooting and fixing process.

Defect Phenomenon

The phone looks very new from the cosmetics, it can be seen that the owner should cherish the mobile phone very much. But the screen turned black and cannot be turned on after using it in the rain, so it should be the boot or the display circuit with the problem. 

We should disassemble the phone and check the parts and accessories to know the exactly defective reason.

01 The cosmetic looks good

Disassemble the Phone

First, let’s disassemble the phone to have a check.

Place the phone on the heating pad, set the heating temperature at around 90℃, and heat for 3 minutes. After that, the glue between the rear housing cover and the middle frame will get soft, then we can separate it easily with the plastic pry opening tool.

02 Separate the rear cover from the middle frame

Secondly, let’s remove the screws.

03 remove the protective screws

In the 3rd step, let’s separate the middle frame

04 Sperate the middle frame

After taking off the baffle, we can see there do have some water-damaged traces.

05 Take off the baffle we can see there do have some water damaged traces

And the corresponding location on the motherboard is the battery connector. 

06 Corrpsonding location is the battery connector

The waterproof mark sticker on the motherboard is also turned red.

07 water proof sticker

Then, let’s protect the cameras with tape stickers. And take out the motherboard to check carefully, after checking, there are some corrosive defects around the two shielding covers

08 there are some corrosive on the shielding cover

Troubleshooting & Repair

After separating the phone, we found the most obvious defects located on the two shielding covers of the motherboard. Let’s remove the shielding covers to deal with the components and chips inside.

Place the motherboard on the PCB holder

09 Place it on the PCB holder

Heat the 1st shielding cover with the hot air gun and take it off with tweezers when the tin is melted

10 Heat the 1st shileding cover with hot air gun and take it off with tweezers when the tins are melted

It does have a lot of electrolytes in it, we can clean them with the PCB cleaner first.

11 Clean the It does have a lot of electrolytes in it with PCB cleaners

After that, apply a proper amount of solder paste flux, and heat with the hot air gun to reflow the components

12 reflow the components with the hot air gun

After processing is complete, solder back the shield.

13 Solder back the shield

For another shielding cover, we can deal with it with the same process

14 Deal with another shielding cover

When all the components under the two shielding covers have been reflowed, let’s assemble the phone to have a test.

15 Assemble the phone to have a test

Plugging the USB charging cable, we can see the charging symbol, but there is no charging current

16 Charging Symbol
17 But there is no charging current

So we should also check the charging-related parts!

Take out the motherboard again and check the the battery connector with multimeter. After checking, one connector pin is open line, the diode value is OL!

18 One pin is OL

Check under the microscope, some of the battery connector pins are corrosive.

19 Battery pins are corrosived

Let’s fix the pins by scratching off the surface corrosion first, then apply a little bit of solder paste to fix the open line rail.

Measure the diode values on the battery connector again, the OL is gone!

21 Diode value back to normal

The battery flex connector should also be ‘refreshed’ too. We can apply a little bit of solder paste and scratch with the soldering iron slightly to make the pins shine as new.

Assemble and Test

Clean the motherboard and assemble the phone to test again.

This time, the phone can turn on normally and the charging function is OK. As we can see there’s a 1.6A charging current when connecting with the charging cable.

23 The charging function back to normal

Test the other functions are also OK.

In the last step, assemble the rear cover with special glue, then the phone issue is perfectly repaired.

Vivo T1 In the Rain and Won't Turn On

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REWA Academy

As an enthusiastic educator and expert in mobile technology, REWA Academy has dedicated its career to empowering individuals through technical education. With a keen focus on cellphone repairs, they have developed comprehensive online and offline courses at REWA Academy. Their expertise spans a wide array of areas, including iPhone repair training, phone hardware, software, and advanced troubleshooting techniques. Through their writings, they aim to demystify mobile technology complexities, making it accessible and understandable for both novices and professionals in the field.

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