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REFERENCE Redmi 9T Can't Turn On

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Dr. Einstein

Dr. Einstein

Registered
Joined
Oct 31, 2022
Messages
17
Brand: xiaomi
Model: Redmi 9T
Detailed Issue: Lumalabas ang charging indicator sa screen kapag lagay ng usb cord pero try pressing power button, HINDI MAG ON.

ACTION TAKEN:
1. Test ang power button key flex if good or bad. In my case, good so hindi un ang sira.

2. Voltage check sa testpoint between J2999 and J2858. See image for reference. Ung testpoint sa upper left ay dapat present ang pull up voltage na 1.8V. In my case present. If hindi present, hanapin kong saan nanggaling at bakit wala. Note: no 1.8V sa nasabing testpoint, hindi mag oon ang board.

3. E-Short ang Testpoint gamit ang tweezers or any metal ng upper left testpoint to ground atleast 4 to 6sec pra maverify if mag on or hindi. In my case hindi na On.

4. Merong power button signal ic na responsible para sa On and off ng model na ito. Ito ung U1800.. see image for reference.. EREFLOW ang ic. Kong hindi gumana, reball ic. Kapag wala parin. Change Ic. In my case, nereflow ko lang using may unmodified quick 2008 with temp: 320 and air 30.

5. Ulitin ung step 3, or try to power on ung board. In my case, resolved ako sa step 4.. ☝️

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Last edited by a moderator:
Dr. Einstein said:
Brand: xiaomi
Model: Redmi 9T
Detailed Issue: Lumalabas ang charging indicator sa screen kapag lagay ng usb cord pero try pressing power button, HINDI MAG ON.

ACTION TAKEN:
1. Test ang power button key flex if good or bad. In my case, good so hindi un ang sira.

2. Voltage check sa testpoint between J2999 and J2858. See image for reference. Ung testpoint sa upper left ay dapat present ang pull up voltage na 1.8V. In my case present. If hindi present, hanapin kong saan nanggaling at bakit wala. Note: no 1.8V sa nasabing testpoint, hindi mag oon ang board.

3. E-Short ang Testpoint gamit ang tweezers or any metal ng upper left testpoint to ground atleast 4 to 6sec pra maverify if mag on or hindi. In my case hindi na On.

4. Merong power button signal ic na responsible para sa On and off ng model na ito. Ito ung U1800.. see image for reference.. EREFLOW ang ic. Kong hindi gumana, reball ic. Kapag wala parin. Change Ic. In my case, nereflow ko lang using may unmodified quick 2008 with temp: 320 and air 30.

5. Ulitin ung step 3, or try to power on ung board. In my case, resolved ako sa step 4.. ☝️
Click to expand...
salamat sa binahagi mo boss ;)
 
Dr. Einstein said:
Brand: xiaomi
Model: Redmi 9T
Detailed Issue: Lumalabas ang charging indicator sa screen kapag lagay ng usb cord pero try pressing power button, HINDI MAG ON.

ACTION TAKEN:
1. Test ang power button key flex if good or bad. In my case, good so hindi un ang sira.

2. Voltage check sa testpoint between J2999 and J2858. See image for reference. Ung testpoint sa upper left ay dapat present ang pull up voltage na 1.8V. In my case present. If hindi present, hanapin kong saan nanggaling at bakit wala. Note: no 1.8V sa nasabing testpoint, hindi mag oon ang board.

3. E-Short ang Testpoint gamit ang tweezers or any metal ng upper left testpoint to ground atleast 4 to 6sec pra maverify if mag on or hindi. In my case hindi na On.

4. Merong power button signal ic na responsible para sa On and off ng model na ito. Ito ung U1800.. see image for reference.. EREFLOW ang ic. Kong hindi gumana, reball ic. Kapag wala parin. Change Ic. In my case, nereflow ko lang using may unmodified quick 2008 with temp: 320 and air 30.

5. Ulitin ung step 3, or try to power on ung board. In my case, resolved ako sa step 4.. ☝️

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Click to expand...
salamat nang marami dto idol.....
 
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