{"id":13061,"date":"2022-03-24T11:01:00","date_gmt":"2022-03-24T03:01:00","guid":{"rendered":"https:\/\/rewa.tech\/huawei-p30-no-boot-issue-repair\/"},"modified":"2024-05-10T15:24:45","modified_gmt":"2024-05-10T07:24:45","slug":"huawei-p30-no-boot-issue-repair","status":"publish","type":"post","link":"https:\/\/rewa.tech\/es\/huawei-p30-no-boot-issue-repair\/","title":{"rendered":"HUAWEI P30 No Boot Issue Reparaci\u00f3n"},"content":{"rendered":"

In this article\uff0c we will share some HUAWEI P30 no boot issue repair cases for your reference.<\/p>\n<\/p>\n

Case 1.<\/span><\/h2>\n

<\/strong><\/p>\n

Defect phenomenon<\/strong><\/p>\n

phone cannot startup<\/p>\n<\/p>\n

Soluci\u00f3n de problemas<\/strong><\/p>\n

Firstly, change another set of phone parts to test, still cannot startup. The issue could be confirmed is from the motherboard.<\/p>\n<\/p>\n

Then take out the motherboard and check the cosmetics, everything looks fine. After that, connect the motherboard and trigger to check the current value of the boot process, it dropped when reach 200mA. Based on the boot sequence check the below voltage values<\/p>\n\n\n\n\n
\n
  Voltage Name<\/strong><\/span><\/pre>\n<\/td>\n
\n
  Normal Value<\/strong><\/span><\/pre>\n<\/td>\n
\n
  Measured Value<\/strong><\/span><\/pre>\n<\/td>\n<\/tr>\n
\n
  VOUT37_1V2<\/pre>\n<\/td>\n
\n
  1.2V<\/pre>\n<\/td>\n
\n
  0V<\/span><\/strong><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
0V means there should be some shortage on this voltage relative rails.<\/p>\n
As we can see from the schematic, the VOUT37_1V2 is sent out from the U1000 to U300<\/p>\n
\"U1000<\/p>\n
\"\"<\/p>\n<\/p>\n
\"\"<\/p>\n
Apply a 1.3V voltage on the VOUT37_1V2 rail, then check the motherboard under the thermal camera, find the U300 is extremely hot. Remove the U300 and check the VOUT37_1V2 again, there is no short.<\/p>\n<\/p>\n
Replace a new U300 chip then assemble to test, all the functions are OK.<\/p>\n<\/p>\n
Caso 2.<\/span><\/h2>\n<\/p>\n
Defect phenomenon<\/strong><\/p>\n
Press the power button cannot startup<\/p>\n<\/p>\n
Soluci\u00f3n de problemas<\/strong><\/p>\n
Firstly, change another set of phone parts to test, the phone cannot be booted, so the issue comes from the motherboard. <\/p>\n
Then take out the motherboard and check the cosmetics under the microscope, there are no burning components, no mold, no deformation… <\/p>\n<\/p>\n
Then check the current with the DC power supply, try to trigger the boot process, and check the current.<\/span>  <\/span>It keeps jumping between 0-200mA. <\/span>Measure the below 3 sets of voltage values<\/span><\/span><\/p>\n