ORION _ BUSH _ GRUNDIG _ MATSUI _ DECCA _ TATUNG - TVs _ CHASSIS PRO 4400 _ SERVICE INFORMATION & SCHEMATIC DIAGRAM

ORION _ BUSH _ GRUNDIG _ MATSUI _ DECCA _ TATUNG - TVs _ CHASSIS PRO 4400 _ SERVICE INFORMATION & SCHEMATIC DIAGRAM

BUSH 3463NTX_3472NTX_WS6667_WS7667_WST_66
ORION 3850_TV2844W_TV4400NTX
GRUNDIG T70-1020 _ WF82-3020
MATSUI 28N03 _ 32WN03
DECCA / TATUNG D28N440_D28W440_D28W441_T21N421_T25N440_T28N440_T32W440_T32W441S

Click on image.

TATUNG V27CMTT-Exx - V30CMTT-Exx - TROUBLESHOOTING - REPAIR FLOW CHART - CHILD LOCK RELEASE

TATUNG V27CMTT-Exx - V30CMTT-Exx - TROUBLESHOOTING - REPAIR FLOW CHART - CHILD LOCK RELEASE

TATUNG 27”/ 30” Wide Screen European LCD Multi-Media Display.
FAULT CODES

NP1	No Picture and No Sound in TV mode	•  Make sure the Power cord and Aerial Cable are properly connected . •  Make sure the batteries in remote control are not flat. •  Press the POWERbutton to switch the TV on. •  Switch to TV source by pressing “TV” button. •  Run “Automatic Search ” by operating the remote control
NP2	No Picture and No Sound in video mode.	•  Check the connection between the optional video equipment and the TV. •  PressSCART , Video/S-V orCOMPONENTbutton on the remote control to select the right video equipment.
NP3	TV is automatically turned off	•  Check if the “SLEEP” timer is activated . •  Press the POWERbutton to turn on the TV once again
PP1	Double Images /Ghosts	If the TV suffers interference from signals reflecting from mountains or buildings , double-pictures or Ghosts will occur. •  Adjust the aerial’s location and direction •  Replace it with one with better directionality. •  Turn off or disconnect the booster if it is in use , as the booster may be inappropriate
PP2	Snowy picture and noisy Sound	If snow totally blocks out the picture , there may be a problem with the Aerial or Aerial Cable . •  Have the TV and aerial been connected properly ? Has the aerial cable been damaged ? •  Is the aerial pointing in the right direction ? •  Is the aerial itself faulty ? •  Try using a booster , as signal transmission may be low
PP3	Distorted picture and noisy sound	•  Turn off or disconnected the booster if it is in use , as broadcast signals may be too strong
PP4	Dotted Lines / Stripes in the picture	If the TV or aerial suffers interference from other equipment , stripes or noise may appear in the picture. •  Keep the TV away from noise sources such as personal computer , amplifier , cars, motorcycles or hair-dryers. •  If the aerial suffers interference from a radio tower or high-voltage wire , contact the local dealer.
PP5	Stripe noise .	•  Check the coaxial cable connected with the TV is not oxidized •  Do not use 300 ohm twin lead cables as interference may occur •  It is recommended to use a 75 ohm coaxial cable (not supplied) to get premium quality picture. •  Keep the aerial cable away from other connecting cables
PP6	No color, too light or too dark	•  Adjust the picture settings -  APC, Brightness, Contrast, Saturation , Color Temp. •  Press “RESET ” button on remote control
NS1	Good picture, no sound	•  Make sure the headphone is not connected. •  Check audio connections between Equipment & LCD-TV. •  PressMUTEor VOL+ to cancel the muting.
NS2		•  Make sure that the aerial connected is 75 ohm coaxial cable (not supplied) , not 300 ohm twin lead cables . •  Keep the aerial cable away from other connecting cables. •  Press SOUNDto select “Mono” which will reduce the noise. •  Adjust BASSor TREBLEproperly in OSD.
NS3	No sound in TV mode	If the Country setting for the TV is incorrect , it may prevent the sound from being issued •  Select the Countrywhere you are located in OSD Menu. •  If the country is not listed in OSD , select “Other Country”.
NS4	Good picture, but noisy sound or no sound in TV mode.	•  If the sound of “all the channels” is noisy , run A.P.S. again by selecting Automatic Searchin OSD. •  If the sound of “some channels” is noisy or no sound , select Manual Search and select an appropriate TV systemin OSD such as B/G , D/K , I , L/L’ ; then , store it. ( If the sound system setting for a TV channel is incorrect , it may prevent the sound from being issued .)
PC1	PC display is Not Full Screen	•  Select Auto Image Adjustin OSD menu to optimize the image . •  If executing Auto Image Adjust still can not achieve full screen display, adjust V.Position and H.Position in PC mode
PC2	Horizontal Noise or Color pattern is not uniform	•  Select Auto Image Adjust in OSD menu to optimize the image . •  If still no good , adjust H. Phase in OSD menu
PC3	“Out of Range” message	•  Maximum PC resolution supported is 1024x768 / 1280 x 768, so the screen will appear “Out of range” at higher resolution. •  Reduce the resolution to 1024x 768/ 1280x 768 from PC .
PC4	No Sound	•  Make sure PC audio Input is well connected.
PC5	“Not Available” message on PIP	•  If Main-Display is PC and Sub-display is Component , resolution of the PC should be reduced to 800 x 600 or lower ;then , the PIP will work well.
PC6	After“No Signal ”has appeared on PC mode for a while, the view disappears and the “ LED Indicator” turns from Green to”Red”.	•  Press any key on keyboard or move the mouse to activate the PC , because the PC may go to power saving status. •  Check if the D-sub connector (Cable) is disconnected or loose .
RC1	Remote Control does not work	•  Make sure the batteries in remote control are not flat •  Check the polarity of the batteries •  Use the remote control in the front of the TV or from less than seven meters away. •  make sure the Remote Sensor Window is not under strong lighting
RC2	Can not change channels with the remote control	•  Press TV button to switch to TV mode. •  Make sure the TV is not in Teletext mode
PH1	Picture suddenly Stops Responding or abnormal	•  Press RESETbutton on remote control . •  Unplug and then plug the Power Cord of the TV from the AC outlet (or the Adapter from the TV). •  If the picture still no good , execute “Initial EEPROM”. Press POWERkey to turn off the TV . Press“CH DN” key on the top of LCD TV ( don’t release ) ; then, press POWER button on remote control until “Initial EEPROM” appears on the screen . (Note: Remind user that every setting will be return to factory preset mode including Child Lock , PIN No. , Programs)

TROUBLESHOOTING FLOW CHART [Clcik on images to Enlarge]
Power Start Not Good

NO BACK-LIGHT, BUT LED LIGHTS UP

NO PICTURE, BUT BACK-LIGHT & LED LIGHTS UP

PICTURE ABNORMAL OR HALT

Steps to Refresh EEPROM

• Press POWER key to turn off the LCD-TV.

• Press CH. Down key on the top of LCD-TV (don’t release) and then press POWER button on remote control, until “EEPROM Initial” appears.

• Now, all the buttons, which you are pressing, could be loosed.

If the PIN of Child-Lock is forgotten , the only way to unlock the channels is to refresh EEPROM and the PIN will also recover initial number “1111”. Besides , all the STORE done by user will be refreshed to the situation of First Time Installation.

FRAME DEFECTS OR STRIPED LINES AT ALL SOURCES

TATUNG T25N440 - T32W440 - SERVICE ADJUSTMENTS - MAIN POWER [SMPS] SCHEMATIC [CIRCUIT DIAGRAM]

TATUNG T25N440 - T32W440 - SERVICE ADJUSTMENTS - MAIN POWER [SMPS] SCHEMATIC [CIRCUIT DIAGRAM]

POWER SUPPLY

Use potentiometer PP1to adjusts the HT for 151V ±0.5Vfor 16:9 tubes at the TSP28 terminals.

SERVICE MODE

• Switch on the appliance whilst holding down the MENU key at the cabinet controls until the red LED lights up.
• Release the MENU button at the cabinet and press the standby key on the remote control. The appliance will default to programme 1, or to AV1 if pin 8 of SCART 1 is connected to a voltage of ±12V. It is therefore important to make certain that the test signal needed to make the adjustments is available either on programme 1, or on the SCART 1 input, as selection of the sources is not possible thereafter in service mode.
• The functions that can be adjusted (listed below) are selected using the P+ and P -- keys on the remote control and the adjustments then made with the Volume ±keys. It is advisable to make a note of initial values before making any changes so that they can be restored if necessary.In the event of replacing the NVM memory or the microprocessor, it is essential to make all the adjustments accessible in service mode, since the replacement memory is supplied without any prior programming and a new microprocessor requires initialization

• IF VIDEO SETTING [IFxx AFCxx]

• This adjustment requires special equipment and will be needed only for the ICC2 N1 version, which is also recognizable by the presence of the LC7 coil. If the coil is present, adjust IF and AFC to the values given on the label affixed to the left side of the main PCB so that a suitable approximation is achieved. If the coil is not present, adjust as follows              INITIALIZATION  (INIT CTV 831 x (VERSION)
• The initialization procedure, which also indicates the software version for the microprocessor, is enabled with the Volume + key and must be carried out whenever the NVM memory or the microprocessor is replaced. Bear in mind that initialization has the effect of erasing all data from the memory except for the bytes option.

SCREEN GRID VOLTAGE [Vg2 Test]

Having selected the function, press the Volume + key. A luminous horizontal line appears in the middle of the screen. Adjust potentiometer G2 on the EHT transfonner so that the line is just visible (in a dimly lit room). Then press Volume (--) and wait for a few seconds until service mode is restored.

CONTROL BYTES [Cox]

These are control registers that must be set as follows:

Co4 00

Co3 27

OPTION BYTES [Opx]

The correct values to set for each appliance are given on the label on the back cover alongside the notations Op3, Op2 and Op1.

AUDIO STEREO A2 DECODER[LA/SA]

The LA and SA functions allow adjustment of the separation between the right and left audio channels, and of the respective levels. An RF stereo generator is therefore required. Disconnect modulation to the left hand channel and adjust LA to give 1.4Vp-p at pin 1 of the SCART 1 connector. Then adjust SA for the minimum residual signal at pin 3 of SCART 1. If a stereo generator is not available, set LA to 01 and SA to 0B to obtain a fair approximation.

LUMINANCE/CHROMINANCE DELAY SETTING [Yx]

The delay must be adjusted to the following values:

Vp = 18 => (PAL) (UK VERSIONS)

Vs = 30 => (SECAM)

Vn = 20 => (NTSC)

Yo =22 => (SCART)

The Yn function is only accessible if the signal is NTSC coded (standard accepted only by SCART)

ON-SCREEN DISPLAY [OSD]

Load the fixed value 3F. (AUDIO MENU APPEARS)

WHITE CONTROL [WB/WG/WR]

Using a black and white bar signal, adjust to obtain a correct gray scale.

HORIZONTAL GEOMETRY [TC/CPPW/EW/HSH]

There are two groups of these functions, one for 4:3 format (suffix 4) and one for 16:9 format (suffix 16), both of which must be adjusted because they are used in the zoom function (4:3 tubes included). The functions of the single parameters are as follows:

TC => Trapezium correction.  (The four adjustments appear in 4x3 and 16x9)

CP => Corner parabola correction

PW => Parabola correction

EW => Horizontal amplitude

HSH => Horizontal shift

VERTICAL GEOMETRY [SC/VSH/VA/VS]

Vertical geometry is adjusted starting with the VS (vertical slope), which is set so that the central horizontal line of the test signal is exactly at the boundary between the visible image and the black part below and must not then be changed again. The functions of the single parameters are as follows:

SC => Vertical S-correction (linearity)

VSH => Vertical shift

VA => Vertical amplitude

AFC Tuner SETTING [AG]

With a signal of lmV applied to the aerial input on an UHF channel, adjust to 4Vdc at pin 1 of the tuner.

TO EXIT SERVICE MODE

Once all the necessary adjustments have been made, press TV or MENU OFF on the remote control to save all the changes and return the appliance to normal operating mode.
                                             Power supply circuit diagram

Click on schematic to Magnify

HOW TO TUNE A TATUNG TV - INSTRUCTIONS

TATUNG C-SERIES WITH [X] BUTTON.
The Tatung C series TVs are equpped with Child Lock which is quiet often set ON to prevent any accedential adjustments being made.  Therefore, the child lock must be disabled fefore any TV Tuning can take place.
 DISABLING CHILD LOCK
* Switch the TV OFF, using the front panel ON/OFF switch.
** Press and Hold down [P+] button on the front panel of the TV, while switching the set ON by its front panel power ON/OFF switch.
*** Release [P+] button.
The child lock will now be disabled.  Repeat the above steps to re-enable if required. 
AUTO TUNING SHOULD BE AVOIDED.
TV TUNING.

1. PRESS THE BUTTON ON THE FRONT PANEL THAT PRODUCES THE ON-SCREEN DISPLAY.
2. PRESS [P-] BUTTON ON THE FRONT PANEL. PRESSING THIS BUTTON WILL SELECT MANUAL TUNING.
3. PRESS AND HOLD [+] OR [-] TO SEARCH UP OR DOWN.WHEN A SIGNAL IS FOUND, RELEASE THE BUTTON.  IF THIS IS NOT THE STATION REQUIRED, CONTINUE HOLDING.
4. PRSS THE KEY TO TOGGLE (AFC) [ON/OFF], SO THAT [AFT] IS ON.
5. USE [+] OR [-] KEY TO FINE TUNE.
6. PRESS [X] TO RETURN TO MANUAL TV TUNING.
7. PRESS [P+] OR [P-] TO SELECT THE PROGRAM NUMBER REQUIRED TO BE STORED.
8. PRESS THE [STORE] KEY.
9. PRESS [X] KEY TWICE TO RETURN TO NORMAL OPERATION.

The 0<>0 Nicam button is often used to access the TV tuning menu.  In some cases, it may be necessary to press and hold the Menu button.