REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Thursday, 28 February 2019

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
Posted By: FRANK at 06:59
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