Tuesday, September 11, 2012

TOSHIBA 29N3DXE 29N3XE - SERVICE MODE DESIGN MODE - ELECTRICAL ADJUSTMENTS

SERVICE MODE
  1. Press {Mute} button once on the remote control.
  2. Press {Mute} button again on the remote control.
  3. While pressing 'Mute' button, press 'Menu' button on the TV panel.
  4. Press 'mute' button to select items to adjust.
KEY FUNCTIONS IN SERVICE MODE
  • A single horizontal line On/Off. >> [-/--] button on the remote control or 'Power' button on the TV.
  • Test signal selection. >> 'Power' button on the remote.
  • Selection of adjustment items. >> Channel Up/Dn button on the remote.
  • Change of the data value. >> Vol +/- button on the remote.
  • Adjustment menu On/Off >> Menu button on the TV.
  • Initialization of memory >> {Call + Channel Up button on the TV}
  • Reset the count of operating protect unit to '00'. >> {Call + Channel Dn button on the TV}
  • R-Cut selection >> 1 button
  • G Cut selection >> 2 button
  • B-Cut selection >> 3 button.
  • CNTX selection >> 4 button
  • COLC selection >> 5 button
  • TNTC selection >> 6 button
  • Test audio signal On/Off >> 8 button
  • Self diagnostic display >> 9 button
SELF DIAGNOSTIC FUNCTION
  1. Press '9' button on the remote control during display of adjustment menu in the service mode.  The diagnosis will begin to check if interface among ICs are executed properly.
  2. During diagnosis, the following displays are shown.
---------------------------------------------------------------------------------
 <SELF CHECK>
2390****
POWER :     00
BUS LINE : OK
BUS CONT: OK
BLOCK : UV  V1  V2
                  QV 01
---------------------------------------------------------------------------------
Explanations:
2390**** >>> Part number of the microcomputer.
Power:  00 >>> Operation number of protecting circuit. [..00] is normal.  When indication other than "00" over current apts to flow, and circuit parts may possibly be damaged.
Bus Line Check >>> OK is normal.  
'SDA-GND' = SDA-GND SHORT CIRCUIT.
SCL 1-GND = SCLPGND SHORT CIRCUIT.
SCL 1-SDA 1= SCL-SDA SHORT CIRCUIT.
Bus Cont  >>> Ok is normal. When indication shows 'Q () () () NG", the device with the number may possibly be damaged. 
Block  >>> V1 = video 1 input mode
V2 = video 2 input mode
Indicated color of mode now selected:  Green & Red.
Indicated color of other modes:  White.
 Green > Normal
Red:  The microcomputer operates to provide judgement of no video signal.  The red color is still indicated though the signal is input, failure may exist in input signal line, including QV 01.
QV 01:  In case of indication green ---- Normal.
In case of indication red with input signal -----, failure may exist in output line including AV 01.
Note:  Component which control character display on screen is QT-1.  If this display function fails to operate due to the damage in QT-1, self diagnosis procedure are as follows.
  1. In case that power indicator is blinking with interval of 0.5 seconds; it means protecting circuit is operating, and the circuit components may possibly damaged.  Check related components.
  2. In case that power indicator is blinking with interval of 'One' second, protecting circuit does not operate, but a part of BUS line does not operate normally.  Check Bus Line.
DESIGN MODE
  1. Select Service Mode. 
  2. While pressing "Call" button on the remote control, press 'Menu" button on TV.
  3. Press 'Menu' button once again.
When QA2 is initiated, items OPT0 and OPT1 of 'Design Mode' are set to data of the representative model of this chassis family.  
Therefore, because  On-Screen specification remains in the state of the representative model.  This model is required to reset the data of items "OPT0 & OPT1"
ELECTRICAL ADJUSTMENT TABLE

Item
Adjustment procedure

Focus VR adjustment
  1. Enter service mode and select any register item.
  2. Press TV/Video button on the remote control until the black cross-bar pattern appears on the screen.
  3. Adjust the Focus control [on T461 –LOT] for well defined scanning lines on the picture screen.
Sub brightness [BRTC]
  1. Set Contrast to minimum, and Brightness to center by adjusting user controls.
  2. Set the TV in service mode to get a white cross-bar of inside pattern.
  3. Select brightness correction [BRTC] and adjust to reduce the value using Volume Up/Volume Dn button so that white portion of inside pattern is slightly light.
  4. Adjust by Vol Up/Dn button to increase the data value of BRTC, and se it just before the difference between the belt of vertical retrace and the border of black portion of the inside pattern is visible.  After that, return to vertical height and contrast.
Horizontal position adjustment [HPOS] & Vertical position adjustment [VPOS].
  1. Set the TV in service mode and get black and white cross-bar signal with Video button on the remote control.
  2. Select either HPOS of VPOS with Ch Up/Dn buttons and adjust horizontal or vertical picture position in the center of the screen with Volume Up/Dbn buttons.
Vertical amplitude adjustment {HIT}
  1. Select the TV in service mode, and get black or white cross-hatch signal with Video button on the remote control unit.
  2. Select {HIT} with Ch Up/Dn button, and adjust vertical amplitude with Vol Up/Dn button, so that vertical amplitude lacks a little.
  3. Adjust vertical amplitude with Vo. +/- buttons so that the first cross-hatch signal touches edge of screen.
White balance adjustment.
Cutoff adjustment
Drive adjustment
  1. Set contrast to ‘40’ and brightness to ‘+20’ by picture control.
  2. Select R CUT, G CUT & B CUT with Ch +/- buttons, to set individual values to initial reference data, and to set GDRV & BDRV to initial reference data with Vol +/- buttons.
  3. Press (-/--) button on the remote control and rotate Screen VR to get one slight horizontal line on screen.  Forevery pressing of (-/--) button provides horizontal line picture and normal picture alternately.
  4. Press (-/--) button to release horizontal line picture, and select the two other colors which did not light in the above step with Ch +/- buttons.  Then tap Vol +/_ buttons so that three colors slightly light in the same level. * To correct the white balance in light area, select GDRV & BDRV with Ch +/- buttons to adjust. ** To correct white balance in dark area, peroform fine adjustment of RCUT, GCUT & BCUT. 
  5. NOTE:  It is released built-in test pattern by changing the adjustment item for some mode.  In this case,select tht adjustment item with channel Up/Dn button first and then select the built-in test pattern.