Memory Resetting (EEPROM)

EEPROM

EEPROM is a short of electrically erasable programmable read only memory, which is actually a chip. In TVs, all service menu settings kept there. You can delete and reprogram this chips millions time. So they are fast and reliable...

Reseting (EEPROM)

For resetting TV, settings, you needed to remove EEPROM device from TV. But it's not required. In electronic world, if you disable communication of the chip, it counts as removed. So we just needed to kill communication of EEPROM. EEPROM on TV's communicating via common i2c protocol. That protocol carries data via SDA line and send clocks via SCL line. In our situation, both blocking SCL or SDA will works. But I decide SDA.

To do this, all you have to do that feeding (connecting) GND (ground) or VCC (3.3v) to SDA line with little wire... That's all. Since this lines are HIGH (v3.3) in IDLE, its better to hold it via VCC. You can also hold this lines via GND too. But don't try to connect both GND and VCC. It will be short circuit and probably will damage your board.

Join VCC and SDA, power on TV and hold about for 20 seconds with the TV powered. It just try to read (wrong) settings from EEPROM, since it cannot read anything (refer to the warning message bellow), just start with defaults. That is what we want. Than releasing SDA line and shutting TV off will update the settings on EEPROM with null values, that TV could boot with it. After all, you can enter service menu and change the required changes.

                         

TOSHIBA UOC

SERVICE TOSHIBA UOC 8873 7E47

Service MODE

To enter in design mode: press vol-key untill volume is zerokeeping pressed vol-key on (Vol-key on key board) ; press display/rcl key on remote , Now (design) mode is open and we can scroll the service bit by P+ / P- key and value canbe changed  by Vol+ / Vol-

TOSHIBA

SERVICE MENU

TOSHIBA - 8893 (MONO-STR-250CH)

STEP NO :-1         PRESS MENU
STEP NO :-2         ENTER CODE:- 6483
STEP NO :-3         ENTER DISPLAY
STEP NO :-4         ENTER DISPLAY=AGAIN CHART PRESS MUTE BUTTON
---------------------------------------------------------------------------------------
                                                         CHART NO
                                                        
        F0                       F-1                                                 F-2
       RC= 80               H. PHASE= 11                              SUB. CONTRUST= 15
       GC=80                V.SIZE= 40                                   SUB.COLOUR= 0
       BC=80                V.POS= 0                                     SEC.COLOUR= 0
       GD=64               V.LIN= 20                                     ST3= 32
       BD=64               V.SC.= 10                                      ST4= 32
       SB=0                  H.BOW= 4                                    OSD.CONT= 3
       U.BLK=8           H.PARA= 4                                   OSD.H.POSI=33
       V.BLK=8           H.BLK-LEFT= 0                           OSD.V.POSI= 1
                                 H.BLK-RIGHT= 0

Service Code : Videocone CTV

Service Mode : Videocone CTVFor open service mode, once short 2tags(jumpers) near comand ic (system ic ormicroprosser ic) in printed line box of main bord and appears six boxes. Fillup this boxes by password and it is very sensitive. Pasword: 991220 / 200528. Another oparetion solve by R/C. In case of another models need a master R/C. Which is supplys by Company and for some sets, use hidden key of R/C
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Service Menu (VIDEOCON /SANSUI/HONDAI/AKAI): Colour TV
There are certain features of CTV which can be accessed & adjusted to optimal level by entering into service menu. To enter into the specific mode, we have to press a SERVICE KEY (S) followed by numeric key of remote handset. Example: Service key (S) followed by numeric key. 1>service Mode. 2>Design Mode. 3>Shipping Mode. 4>Manufacturing Mode..
Service Mode: [VIDEOCONE/SANSUI/HONDAI/AKAI]:
After entering in this mode all Chroma related parameters can be controlled. The parameters explained below can be selected by pressing "CHANNEL UP" and "CHANNEL DOWN" key and adjustment of selected parameter to get best performance, the step value can be increased or decreased by "VOLUME HIGH" & "VOLUME LOW" keys
For Latest Models
Menu>1147
Menu>0323
VOL- , (Local Key,Vol=0) & Display (R/C)

HOW TO ENTER SERVICE MODE TO VIDEOCON 3634R _ 5443R _ 5134R [CHALLENGER]

To enter service mode:

Short contact the service key [Hidden] on the remote.

The screen display "Service".
Press digit (1) to enter into service mode.
Press digit (2) to enter into Design Mode.
Press digit (3) to enter to factory settings.
Press digit (4) to enter into Manufacturing Mode. [This mode is used rarely]

To call an item to adjust, use "UP" & "DOWN" keys on the remote control.
To adjust the data value to selected item, use Vol+ & Vol (-) keys on the remote control.
To exit from service mode, short contact the Hidden Service Key again.

To access the [Hidden] key, just peel out the front sticker on the bottom side of the remote control.  You can see the hidden control hole there.  Won't be a button, but a hole.  Using the head of a small nail, you can short circuit the carbon contacts inside the remote control board.  This one touch will activate the service mode.

Latest single chip models
Entering into service mode
To enter into service mode press hidden [Service] key at the bottom right corner of the remote handset, following display will appear on screen.

** Press key [1] on remote to enter into Service Mode.
** Press key [2] on remote to go into Design Mode
** Press key [5] to get various "Test Patterns" .
Service Mode Keys
** The parameters explained below can be selected by pressing [Channel Up] and [Channel Down] keys.
** Adjustment of selected parameter can be done by [Volume UP/DOWN] keys.
Cancellation of Service Mode
Press the [SERVICE] key once again, or switched off/on the TV set.

Descriptions of some important Service Parameters 
AGC-"33" (0~63)
Vertical Amplitude (VA)-"18" (0~63)
Vertical Shift (VSH)- "0~7
Horizontal Shift (HSH) -"17" (0~31)
OSDH-"13" (0~31)
OSDV- "18" (0~31)

TCL TV

Remote Service Code of TCL Colour TV
-¤-
Old Model
VOL- DISPLAY by R/C
New Model
VOL- > --/- > SLEEP by R/C
or,

TCL M5262 TV mode service

CHASIS Using M5262 IC, PRESS MENU BUTTON THEN

 

INPUT the nimber is 6,4,8,3

change value press volume -/+ or select item press 

program -/+

TCL T2111A TV mode service

Colour Television Receiver Model:T2111A

Simultaneously press “DISPLAY” button on remote

 handset and Volume- button on

                                     or,

for entering into service,power on the T.V. set & set the 

volume to zero then press channel zero on remote

 handset for at once,keep it press for 10 to 15 seconds. 

service mode will activated.

SONY TV

Service Code:By Remote Control: STANDBY-DISPLAY-5-VOL+ -STANDBY(Withen 5 sec.). Select by:1&4 Control by:3&6 Store:MUTE-0

SALORA TV

Service Code:
Model:5301 By Remote Control: DISPLAY=MUTE=SLEEP=FUSSY=DISPLAY Select By CH+/- & Control By VOL+/- as Display. For New Model: 2-MUTE-DISPLAY-SLEEP-MUTE Control as Same. Latest Model: DISPLAY MUTE SLEEP FUZZY Control as Same.
***
Salora Colour Television
Models: SC3630, SC3640, SC3642, SC2025, SC2051, SC2133, PC2142
For Entering Into Service Mode:
* There are 4 hidden service keys inside remote control handset, Short the contacts of hidden service Keys respectively.
===
Salora Colour Television Chassis: 2B-F/EUROSTEREO-1
Models : 28NBS/DIGIVISION 63.2, 71.2, 2'M6
For Entering Into Service Mode:
* Press the Remote control keys in the following sequence within 1 second -/- > MENU > TV
***
SALORA Colour Television Chassis: STEREO PLUS, Models: 17/21SF, 25/28X71, 25/28SP50
For entering into Service Mode
* Press the Remote control keys in the following sequence. MUTE>OK>(M)>TV
* Controls: CURSOR buttons
* Store: OK (M)
* Exit: TV