Panasonic TV Service Modes

For Panasonic TVs in the family GL10C

Model  Chassis

CT-27SF24V APEDP26
CT-31SF24V APEDP266
CT-31XF24CV APEDP266
CT-27SF34V ATPEDP264
CT-27XF34CV ATPEDP264
CT-33SF24TV APEDP266
CT-F29992V APEDP264
CT-F29992VV APEDP264
CT-F29992LV APEDP264
CT-F29992XV APEDP264

Note: May also work with other models not listed. Example, information applied to a CT-27SF14V. See below for other procedures.

Many adjustments are available using the 'On Screen Display Menu,' or 'Serviceman Adjustment Mode,' and you should understand what each adjustment does and note any of their values before changing!

Terminology

• VU: Volume Up
• VD: Volume Down
• CU: Channel Up
• CD: Channel Down
• SM: Serviceman Mode

Entering serviceman mode

Serviceman mode (SM) can be entered in two ways, Remote Method and Other Method (back of case open).

• Remote Method
  
  
  • In SET-UP icon, set antenna to CABLE
  • In TIMER icon, set sleep timer to 30
  • Exit menus and tune to channel 124
  • Adjust volume to 0
  • Press volume down (VD) on control panel and red 'CHK' will appear in the upper left corner
  • To toggle between Serviceman and Aging Modes press Action and VD on the control panel
  
  
• Other Method
  
  
  • Short test point FA1 to cold ground FA2 (A-board: TP pin 8 to pin 3)
  • Receiver is in Aging Mode with yellow 'CHK' in the upper-left corner
  • Press Action and VU on the control panel and 'CHK' should be in red

• The set is now in Serviceman Mode, of which there are five (5) separate Serviceman Modes:
  
  
  • 'B' VCJ Sub Adjustments
  • 'C' W.B. Adjustments
  • 'D' Pincushion Adjustments
  • 'S' Options Adjustments
  • 'CHK' Normal use of VU/VU and CU/CD buttons (no adjustments can be made)
    
    
  • Use the Power button on the remote to switch between these modes

Accessing and Modifying the Service Adjustments

• Once you have selected one of the four adjustments modes use the CU and CD buttons to move between settings.
• Within a setting use the VU and VD buttons to adjust the level or value. NOTE: Write down any original values before changing!

The Four Adjustments Modes

I. DAC Adjustments

Mode Adjustment   Range Default
B0 Sub Color   0-63 32
B1 Sub Tint   0-63 33
B2 Sub Brightness   0-192 123
B3 Sub Contrast   0-63 24
B4 RF AGC1    0-127 43
B5 Sub Brightness for AI  0-63 16
 

II. White Balance (W.B.) Adjustments

Mode Adjustment   Range Default
C0 R Cut-Off   ** 2 20
C1 G Cut-Off   0-255 214
C2 B Cut-Off   ** 2 20
C3 User Brightness   0-63 31
C4 Sub Brightness   0-192 123
C5 R Drive    0-255 119
C6 B Drive    0-255 91
C7 R Drive Offset - Cool  0-63 12
C8 B Drive Offset - Cool  0-63 12
C9 R Drive Offset - Warm  0-63 20
CA B Drive Offset - Warm  0-63 12

** Note: Range is in steps:
  0 20 - 0 235
  1 20 - 1 235
  2 20 - 2 235
  3 20 - 3 235
 

III. Pincushion Adjustments

Mode Adjustment   Range Default
D0 Vertical Size   0-127 68
D1 Vertical Linearity  0-63 37
D2 Vertical S Correction  0-63 12
D3 Horizontal Size   0-63 48
D4 Horizontal Center  0-31 12
D5 E-W Parabola   0-63 14
D6 Trapezoid Compensation  0-63 31
D7 E-W Corner 2   0-15 12
D8 E-W Corner 1   0-15 9
D9 Vertical EHT   0-15 8
DA Horizontal EHT   0-15 8
DB Vertical DC   0-63 31
 

IV. Options Adjustments

Mode Adjustment   Range Default
S0 Pre shoot/Overshoot  0-7 4
S1 Black Expansion Gain  0-15 7
S2 White Gamma Level  0-15 15
S3 White Gamma Gain  0-15 15
S4 Small Gamma Gain  0-15 7
S5 R-Y Demodulation Angle  0-31 12
S6 R-Y Demodulation Gain  0-63 23
S7 G-Y Ratio SW   0-3 1
S8 White Letter Compensation 0-15 4
S9 White Letter Slice Voltage 0-15 5
S10 Filter    0-63 30
S11 Low Frequency Separation 0-63 39
S12 High Frequency Separation 0-63 22
S13 Clock Adjustment  0-255 165
S14 Scroll Output, Font Mode 0-2 1
S15 ID Positioning Mode  0-2 0
S16 PIP Chroma Saturation  0-127 39
S17 PIP Contrast   0-127 36
S18 PIP Tint   0-63 10
S20 PIP Position 1/16 Left  0-255 10
S21 PIP Position 1/16 Right  0-255 116
S22 V1 Gain    0-15 8
S23 S-AI Music   0-255 30
S24 S-AI Vocal   0-255 60
S25 S-AI Off   0-255 240
S26 S-AI Up Step   0-15 2
S27 S-AI Down Step   0-15 4
S28 Auto Bass Max   0-63 50
S29 Auto Treble Max   0-63 55
SA Switches (TV)   0-255 36
SB Switches (Video)  0-255 0
SC Switches (Video)  0-255 36
SD Contrast Sensitivity  0-255 109
SE Input Level Alignment  0-63 46
SF Stereo PLL VCO   0-63 27
S1A PIP Position 1/9 Upper  0-255 26
S1B PIP Position 1/9 Lower  0-255 146
S1C PIP Position 1/9 Left  0-255 10
S1D PIP Position 1/16 Right  0-255 101
S1E PIP Position 1/16 Upper  0-255 26
S1F PIP Position 1/16 Lower  0-255 163
S2A R Offset   0-40 20
S2B B Offset   0-40 20
 

All functions may not be available on a particular receiver, and some modes may exist on a receiver that are not listed above. These unknown settings should not be changed!

Checking Purity

When in non-adjustment SM (red 'CHK' in upper-left corner) press the Recall button on the remote to cycle between color modes:

• White
• Red
• Green
• Blue
• Normal

Exiting serviceman mode

• Enter the non-adjustment SM (red 'CHK' in upper-left corner) and press and hold the Action and Power buttons on the control panel for at least 2 seconds.
• The receiver will shut off and turn back on to cable channel 3 with a preset sound level.
• All programmed channels, caption data and other user-defined settings will be erased.

For Panasonic TX-W28R3 (and similar models)

The remote control is used for entering and storing adjustments, with the exception of cut-off adjustments which must always be done prior to service adjustment. Perform adjustments in accordance with screen display. The display on the screen also specifies the CCU variants as well as the approximate setting values. The adjustment sequence for the service mode is indicated below.

• Set the Bass to maximum position, set the Treble to minimum position
• Press the Reveal on the remote control and at the same time press the Volume on the customer controls at the front of the TV, this will place the TV into the Service mode
• Press the RED/GREEN buttons to step down/up through the functions
• Press the YELLOW/BLUE buttons to alter the function values
• Press the STORE button on the preset panel after each adjustment has been made to store the required values
• To exit the Service Mode, press the Normalization button