Tuesday, 6 November 2012

tricks to overcome short phone after on / off

Hi friends of technicians, introduce my name is wahyu,,, would have known for sure,,, already on the blog profile hehehehehe,,, friends technicians must already know the hardest part of the repair hp for SW (software), especially at HW (hardware) ,,,, I personally think the hardest thing for the following HW in repairing mobile phones:
1.a short phone after on / off
2.pure short mobile phone,,,, although not as hard as it no 1,,, but we as engineers are not uncommon in for dizziness,,,
3.(contact service)
4.signal search not found
5.total dead phone
6.handphone break point
to solve problems on the course we as engineers should not be hasty in their stride, instead of profit or loss even what mobile phone in the living conditions, can(total death) if we are wrong to execute, well before we go any further on how to properly execute a mobile phone and the right, let us see review below:

a mobile electronic communication device that includes a series of components that consist of, pcb, capacitor, resistor and diode ic, which etc.yang interconnected with each other,

where the components in dire need of voltage 3.7 (VBAT) which we call battery to maximize the performance of each komponen.vbat itself flows through the capacitor where the line should not be leaking (short) bit, if VBAT is leaking then it can be sure the phone will be(wasteful batteries), as I mentioned above the in 2 types:
1.short after on / off
2.short before on / off

I tell:
1.short after on / off
we turn on the phone with the PS (power supply) if the indications on the screen above the normal rate exceeds the 20A then it can be sure the phone is short after the on / off. as shown below:


But if the indications on the screen PS normal then we have to wait until the phone is standbye. mobile stanbye normal circumstances 0A voltage, if the voltage exceeds or up and down the mobile phone is erratic short after on / off. as shown below:



Why is Short after the on / off???
Short after the on / off occurs because there is a leak VBAT at working voltage, working voltage (vana, vio, v core, vaux.etc)

How to overcome the short after the on / off:
1.If indication amperes voltage exceeds 20A PS, then we
quite touching each component of the mobile phone, if any one of the hot components (except the cpu and flash ic) before we replace the ic is we're trying to pull the first capacitor closest ic, if still then we must change the ic.
2.If his short time standbye the steps we need to do:
1.setting avo us at 25A DC mode
2.When avo plus end of the cable (red) and min (black), black cable that we give VBAT voltage (3.7V) from ps. then the ground wires on the PS we snap to ground mobile, cable plus avo is what we use to inject the working voltage mobile phone, the way we used to pick out voltage capacitor works, only then we shot the voltage to the capacitor, as shown below:


remember! Distinguish between his ground,,, need to keep in mind the cpu and flash ic not be short, good luck and hopefully useful. See you on the post following his

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