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Fix Huawei Enjoy 5S /GR3 No Power  

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Gsm4arab
(@mtpro)
Member Moderator
Joined: 2 months ago
Posts: 32
22/01/2020 6:44 am  

إصلاح هاتف هواوي Enjoy 5S /GR3  لا يعمل

Fix Huawei Enjoy 5S /GR3 No Power

Huawei Enjoy 5S /GR3 (TAG-AL00)
No Power ON repair case:
First:Phenomenon problem description
-the No Power ON is split into a single board
and powered up.
Second, the analysis of ideas
Since the board is powered by a large current, it indicates that
the board has a short-circuit fault and should be analyzed and
repaired from the voltage direction required for power-on.
Third, the positioning process
(1) Visual inspection of pmu and related device appearance, no liquid,
mildew and other defects.
(2) Because it is a large current for power-on, first measure the
pin3 pin or pin6 (vbat path) of the battery connector j501 with a
multimeter, the impedance to ground is 0.362, the path is normal; the
channel of vchg/usb_pwr is measured, and the path is normal;
Secondly, measure the output voltage of the pmu power chip, for
example: vsys_pmu, vlte_pmu, vcore_pmu, vio18_pmu, etc., find that
the vsys_pmu path is shorted to ground (measuring point c515), and
the other voltage outputs are normal. Because of this channel network,
only A chip u501, so judged to be caused by internal damage of u501.
The circuit schematic is as follows:
Fourth, the solution and effect
After the u501 is removed, the short circuit disappears and the fault
is repaired after replacing the new material.
V. Experience summary and suggestions
For a single board that is powered by a large current, a short
circuit phenomenon generally occurs; we carefully analyze the short
circuit phenomenon; as long as the short circuit fault is repaired OK,
This measurement
point is shorted to ground
This network is shorted to ground
the No Power ON fault is solved.

-----------------------------------------

TAG AL00 No Power ON repair case

هاتف هواوي GR3 لايعمل
و تبين معنا أنه يوجد دارة قصر (شورت) في التغذية
1-نتبه لايسي الباور PMU و نتأكد من حالة الجهاز  ،
عدم وجود اي سوائل ،العفن وغيرها من العيوب.
2-نقوم أولاً بقياس pin3 pin أو pin6 (مسار vbat) لكونكتر البطارية j501 مع
المتر ، ومقاومة الأرض 0.362 ، المسار طبيعي ؛ ال
يتم قياس قناة vchg / usb_pwr ، والمسار طبيعي ؛
ثانيا ، قياس الجهد الناتج من ايسي الباور pmu ،
على سبيل المثال: vsys_pmu ، vlte_pmu ، vcore_pmu ، vio18_pmu ، وما إلى ذلك ، نكتشف أن يتم تقليل مسار vsys_pmu إلى الأرض (نقطة القياس c515) ، و
مخرجات الجهد الأخرى طبيعية. بسبب شبكة القناة هذه ،
رقاقة U501 فقط ، لذا يُمكن أن يكون سبب التلف الداخلي لـ U501.
بعد إزالة U501 ، يختفي الشورت  والخطأ و يتم إصلاح بعد استبدال الايسي.

 


Quote
Tayser Homsi
(@tayser1986)
Member Moderator
Joined: 2 months ago
Posts: 15
22/01/2020 6:54 am  

شرح جميل يعطيك العافية اخي


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