Analysis of short flows / konslet nokia bb5

For BB5 phones that use RF IC AHNE using non Processor v1.1 RAPGSM RAP3G.
RAPGSmv1.1 include Dlm CMOS Processor (MOSFET), which is a combination of a number of Vdd Field effect transistors (Drain) as a teg. Positive and VSS (source), as a negative.

RAPGSM the need for 2 kinds of voltage as follows:
Microprocessor Vcore Voltage = 1.4 V
Signal Data Processor Voltage 1.8 V = Violence
It is 19 meters RAPGSM Vddcore who receive a positive supply voltage 1.4 V (drain) of 19 meters and TAHVO VssCore negative voltage (source) to the ground.
And 11 meters, which will VddIO voltage 1.8 V.

Now almost fifty meters from the input supply voltage (Vdd / VSS) to this page rap, often have problems in the short kaki2nya. So, presumably due to the RAPGSM.
But if you want a more accurate measurement of short or not this RAPGSM difficult when injecting Heat stress and sense (touch it Best answer.) Or referred to given voltage (set teg work. Honored if necessary, directly to Power Supply, no more than IC regulators retu & TAHVO them, and seeing the reaction of PD power consumption).
Why? Because IC module RAPGSM data Vdd / VSS have diode protection switching time for shorting. Such a short rap itself is not perceived as heat, but heat is a voltage regulator, which provides (retu / TAHVO). So that may be incorrect detection, heat does not mean retu retu reply brief.

Method of elimination to determine which components of brief as follows:
(How to remove the tension is eliminating ingredient, which is suspected, then compare the current power supply included.)
1. Elimination TAHVO
Unplug L2302, or deleted, Vcore will be lost. Check again. If the same conditions MSH? If you sign the patient is not a problem Vcore for Rap.
If SDH normal heat problems 100% RAPGSM (part of the microprocessor).
Unplug L2301 & L2306, or lack TAHVO VBat data drop out, charging circuit does not work. Check again. Conditions are the same? If you have a problem with the patient TAHVO rating. If SDH normal heat problem TAHVO.

2. Elimination of PA
Unplug Z7520, teg. VBAT PA will be broken. Check again. If the current consumption should be normal, then the problem 100% PA.

3. Elimination of RF IC (AHNE)
Unplug L7502, teg. VBAT to AHNE be completed, if the current consumption should be normal, then the problem 100% AHNE. If the flow is still high, there is a problem AHNE, replace L7502.

4. Bluetooth IC Elimination
Unplug L6077, teg. VBAT IC BT will be completed, if the flow is normal, then the BT IC problematic.

5. Camera IC & elimination of regulatory
Unplug L3303, if the flow is normal, then the problem with camera or a camera IC (D3300)
If the flow is still high, pull L3304, turnover is normal, then 100% of regulatory problems, camera (N3300)
Camera ICs are often problematic download.

For the DSP takes RAPGSM teg. Violence. Elimination of export RAPGSM. Then look after the reaction of PD PS, or if you retu still feel hot. If SDH normal, then sign RAPGSM problematic. If the heat retu MH / PS current rating is still high, instead of disaster RAPGSM.
RAPGSM a short time, two possibilities can be distinguished by a short BGAnya kaki2 causes RAPGSM module itself.
If kaki2 BGA problematic, can be created to print (Reball)
However, if after diReball, increased return flows, retu heat. To the SDH RAPGSM damaged.

Shorting the phone in 3 categories:

• Go short so party Batt / PS. (Immediately jumped into the stream in PS)

• After pressing the short switch on / off. (SP stem rose after pressing the on / off)

• In short, when receiving call / transfer. (Current ride height when calling)

Condition 1, realized more easily. Control and eradication instant get-voltage components VBatt. The PA, retu, TAHVO, RF IC, BT IC, etc. ..
Condition 2. Kinda hard to detect them. Check & elimination component receives voltage regulator (retu, TAHVO, camera regulatory regulatory indicators, etc.)
Condition 3. In general, damage to PA .. Because the Assembly's work Call In / Out.