SAMSUNG SM-T805 - SAMSUNG GALAXY TAB S 10.5 – TROUBLESHOOTING – GPS NOT WORKING – BOOTING FAILURE – NO SERVICE – WIFI PROBLEM – NO DISPLAY - TABLET REPAIR AND SERIES

Samsung SM-T805 - Samsung Galaxy Tab S 10.5 – Troubleshooting – GPS not working – booting failure – No service – Wifi problem – No display - Tablet repair and series

Category: Tablet repair and service 

Contents of this article 

• No power 
• Booting failure 
• LCD problem 

Samsung Galaxy Tab S 10.5

TROUBLESHOOTING 

Mobile phone does not power on.

Check the Battery Voltage. Is it more than 3 8V?

Charging the battery by TA. If its voltage level is extremely low(under 3.3V), Change the battery.

Push the Power Button for 8 seconds. Then wait 3 minutes, check the power-on sound or motor Vibration or light on touch key. Sound or Vibration is ok?

Change the FRONT-LCD ASSY or LCD Con-to-Con Connector

Check the U502 output voltage (C547 > 1.0V, C557 > 1.0V, C553 > 1.0V)

If the output voltage is not satisfied with normal condition, Change the U502 .Each voltage level has ±10% margin.

Check the Clock OSC400 Is that frequency 24Mhz,?

Change the OSC4000

Check the C527, R508 Votage level. Is it over 1.5V?

It Can be Damaged AP(UCP40001-1) or LPDDR3 Memory. It is Needed to dump Memory or Check with S/W Team to Analyze. So, Change the PBA.

Initial Failure

Re-download latest SW on the mobile phone.

Try the Boot Recovery by SD CARD. Follow the Recovery Guide.

Re Check "8-3-1 Power on" Trouble shooting process

Check the OSC4000(Crack, open etc.) Check the UCP4001-1 (Crack etc)

Check the OSC4000(Crack, open etc.) Check the UCP4001-1 (Crack etc)

No service

Check memu setting
Menu > applications > setting  > wireless and network > mobile networks > network mode > setting is auto mode ?

Menu > Phone > Keypad > *#1234# > check Phone version > PHONE : T805XXXX or
PHONE : unknown

Check the contact of RF antenna clip

Check the voltage level R324 = HIGH

Replace the U502

Check OSC1001 Frequency = 26MHz

Replace the OSC1001

Replace UCP301

Charging Part

TA / USB Insert

Check OVP input Voltage C707 = 5V

Replace GH59-13985A

Check the Charger IC Input Voltage(C565)=5V

Replace U701(OVP IC)

Battery is Charging?

Replace U512

Microphone Part

Check microphone function in voice call Hands-free mode or Camera(camcording) mode

Check board connection(HEA700) and check connection IF FPCB to Mic FPCB

Set the HEA700 connection Set the IF FPCB to Hall IC FPCB connection Set the Hall IC FPCB to Mic FPCB connection

Check status of FPCB (damaged or tore FPCB, broken connector)

Replace problem FPCB

Check component soldering statuses of L702,L703

Resolder or replace L702,L703

Check the voltage at TP614 = 2.6V

resolder or replace U602

BT is not working

Check BT function ON
Enable BT Function

Check the antenna c-clip has no problem?

Replace antenna c-clip, ANT200&ANT201

Check the REAR antenna pattern (open, crack, deviation, etc)

Replace REAR

Check (crack,open,etc) L202, C223, F204, C208, C210, F206, L204, C215, C216, F203, C271

Resolder or change the wrong element (open, crack, deviation, etc)

Check the Voltage on C244 ≥ 3.4V

Check the CHARGER IC(U512) (crack, open, damaged, etc.)

Check the Voltage on TP223,C243 = 1.8V C294=1.2V

Check the AP(UCP4001), (crack, open, damaged, etc.) Check L238 open

Check the Status of OSC200, R205,C272,C273

Resolder or change the OSC200, R205,C272,C273

Resolder or Replace U206

WIFI is not working

Check WIFI function ON
Enable WIFI Function

Check the antenna C-clip has no problem?

Replace the antenna c-clip ANT200,ANT201,ANT202,ANT203

Check the REAR antenna pattern (open, crack, deviation, etc)

Replace REAR

Check WIFI MIMO RF PATH(crack,open,etc) L202,C223,F204,C208,C210,F206,L204,C215, C216,F203,L213,C221,C226,F205,L232,C275, F208,CPL200,C225,C222,F201,C224,C254, F207,L236,C276,C290,F209,C252,C253,C255, C256,C259,C260,C261,C262,C263,C264, C265,C266,C267,C268,C269,C270

Resolder or change the wrong element (open, crack, deviation, etc)

Check the Voltage on C244 ≥ 3.4V

Check the CHARGER IC(U512) (crack, open, damaged, etc.)

Check the Voltage on TP222&C243=1.8V,C294=1.2V

Check the AP(UCP4001) (crack, open, damaged, etc.) Check L238 open

Check the Status of OSC200, R205,C272,C273

Resolder or change the OSC200, R205,C272,C273

Resolder or Replace U206

GPS is not working

Check GPS function ON
Enable GPS Function

Check the antenna C-clip has no problem?

Replace the antenna c-clip, ANT202,ANT203

Check the REAR antenna pattern (open, crack, deviation, etc)

Replace REAR

Check (crack,open,etc) L208,F202,L206,U201,L200,F200,C211,C213, CPL200,F208,C275,L232

Resolder or change the wrong element (open, crack, deviation, etc)

Check the Voltage on C212= 1.8V (When activating GPS, using app)

Check the AP(UCP4001) (crack, open, damaged, etc.)

Check the Voltage on C205,C207 = 1.8V & C214= 2.8V (When activating GPS, using app)

Resolder or change the C201, C202, OSC201

LCD is still off after PWR ON

Check the connection of SLC800

Reconnect the SLC800

Check OCTA_VDD_3.3V=3.3V (C817),

Resolder or Replace the DCDC(U802)

Check the TCON_1.8V (C838)

Resolder or Replace the PMIC(U502)

Check ELVDD_+5V(C842) ELVDD_-5V(C843)

Resolder or Replace the DCDC(U805)

Replace LCD Module