LG B2050 Support and Manuals
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Popular LG B2050 Manual Pages
Service Manual - Page 2
... 76 4.10 Key Backlight Trouble 78 4.11 Receiver Trouble 80 4.12 Microphone Trouble 82 4.13 RTC Trouble 84 4.14 Indication LED Trouble 86
12. BLOCK DIAGRAM 94 7. CIRCUIT DIAGRAM 97
3. Reset [MENU 6 109 9.7 S/W version [MENU 7 109
10. INTRODUCTION 2
1.1 Purpose 2 1.2 Regulatory Information 2 1.3 Abbreviations 4
5. EXPLODED VIEW & REPLACEMENT PART LIST ...117
12.1 Exploded...
Service Manual - Page 3
... company may temporarily disconnect service as long as specifically noted in substantial additional charges for any remaining warranty.
- 2- C. Therefore, note that the equipment provided tocustomer is not done. There are responsible for the security of own system. Incidence of Harm
If a telephone company determines that unauthorized alternations or repair may affect the regulatory...
Service Manual - Page 4
...INTRODUCTION
E. Notice of Radiated Emissions
This model complies with these are for illustrative purposes...problems.
H.
Interference and Attenuation
Phone may interfere with anti-static mat which contain Electrostatic Sensitive Device (ESD), are indicated Following information is also grounded.
•Use a suitable, grounded soldering iron.
•Keep sensitive parts in this manual...
Service Manual - Page 18
... E-GSM 900 bands, and low-side injection is divided by 2 for the DCS 1800 and PCS 1900 bands. Low-pass filters before the OPLL phase detector reduce the harmonic content of a feedback...outputs. The RFLO frequency is programmable with the FIF[3:0] bits in register 03h can be set to manually exchange the I and Q signals are automatically swapped when switching bands. Additionally, the SWAP...
Service Manual - Page 27
Reset SIM block
Table 3-6 SIM CONTRON SIGNALS DISCRIPTION
2V85_VSIM
2V85_VSIM
SIM_DATA
R336 20K
R337 0
J300
4 5 6 10 9
...SIM card, 3 signals SIM_DATA, SIM_CLK,SIM_RST(GPIO_23) are generated by the Auxiliary ADC, audio, and charger modules.
- 26 - This model can support only 3.0 volt interface SIM card. The AD6527 checks status periodically during established call mode whether SIM ...
Service Manual - Page 47
4 . TROUBLE SHOOTING Checking Flow
START
HP8960 : Test mode 62 CH, 7 level setting (TCH) 62CH, -60dBm setting (BCCH) Spectrum analyzer setting
Oscilloscope setting
Check regulator circuit
Check VCTCXO
Check FEM & Mobile SW
Check RX IQ
Redownload SW or Do calibration again
- 46 -
Service Manual - Page 51
...
Yes
Check R512, R515, R517
Check whether FEM Set as RX mode
Refer toTable 4-2
VC1 :Low or HIGH
No
VC2 :Low
VC3 :Low
Yes
Check RF Level of
FL500.1 (for GSM) & FL500.3
(for DCS) & FL500.5 (for PCS)
Pin1 : ~ -62dBm
No
n 3,5 : ~ -63dB
Yes
FEM & Mobile SW is OK See next Page to check Rx...
Service Manual - Page 54
Checking Flow
START
HP8960 : Test mode 62 CH, 7 level setting (TCH) 62CH, -60dBm setting (BCCH) Spectrum analyzer setting
Oscilloscope setting
Check regulator circuit
Check VCTCXO
Check FEM & Mobile SW
Check PAM contral
signal
Check TX IQ
Redownload SW or Do calibration again
4 . TROUBLE SHOOTING
- 53 -
Service Manual - Page 58
... for GSM, PL=2 for DCS)
Check R512, R515, R517
No
Check whether FEM
Check VC1, VC2, VC3
Set as TX mode
Refer to Graph4-6(a), 4-6(b)
Refer to Table 4-3
Yes
Changing board
Check RF Level of FL500 Pin 17...EGSM DCS_ Rx
L
PCS_Rx
H
VC2
VC3
L
H
H
L
L
L
L
L
Table 4-2
- 57 - TROUBLE SHOOTING
For the test, TX Stand alone Mode is needed. Check SW500.ANT, RF with RF Cable connected.
Service Manual - Page 64
... : GND
NO The TA is out of D100 = 5.2 V? YES
Charging is well-solderd?
TROUBLE SHOOTING
START
I/O Connector (CN300) is properly operating
- 63 - Replace the Q100, D100
YES
NO 0.7 < voltage(R109) < 1.3V? Replace the Q100
YES Battery is about 10~100mV?
NO
The battery may have
problems.
Change the battery. YES
Q100, D100, R108 are well-soldered?
Checking Flow...
Service Manual - Page 66
... the soldering of R315, R399
YES
NO Resolder R315, R399
Check the soldering of C300
YES
Replace U401
NO Resolder C300
Check the soldering of U401 high? TROUBLE SHOOTING Checking Flow
SETTING : Enter the engineering mode, and set vibrator on at vibration of BB test menu
START
NO Is the voltage at pin 1
of...
Service Manual - Page 74
...
And try again.
NO Change the main board
YES Change SIM Card
YES SIM Card will be detected
- 73 - Checking Flow
4 . Redownload SW. NO
YES
Replace J300 or check soldering of U101
Is 3V?
Does it work
Properly?
NO Change the SIM Card. TROUBLE SHOOTING
START
Does the SIM cards supports 3V?
Service Manual - Page 80
...
contact of U202? NO Resolder or replace U202
YES Check
the voltage at 5,7 pin of dual mode
speaker (receiver)
YES
Reassemble receiver
U202 works properly? TROUBLE SHOOTING
SETTING : After initialize Agilent 8960, Test EGSM, DCS mode Set the property of mobile as PRBS or continuous wave. Checking Flow
4 .
Set the receiving volume of audio as Max...
Service Manual - Page 111
...26 in GainControl Index. -Normal phone should indicate the value of RSSI close to -16dBm when setting the value between 0~15) c. Selecting Channel-Select one of GSM or DCS Band and input.... STAND ALONE TEST
10.1 Introduction
This manual explains how to see if the receiver of the model. Tx TestTX test -this is activating normally.
10.2 Setting Method A. Selecting APC a. C.
In the...
Service Manual - Page 131
...SBOM standard on GCSC
Location
Level
No. Description
3
SBPL00 BATTERY PACK,LI-ION
3
SSAD00 ADAPTOR,AC-DC
3
WSAY00 SOFTWARE,APPLICATION
3
WSYY00 SOFTWARE
Part Number
Specification
SBPL0077901
3.7 V,830 mAh,1 CELL,PRISMATIC ,FG101 RUSSV423450, Innerpack
SSAD0007835 FREE ,50 Hz,5.2 V,800 mA,CE,CB ,UK(IO.24P)
WSAY0014101 B2050 TMU PC-Sync
WSYY0239601
B2050P40FL-44-V101-234-30 APR 13...
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