Panasonic TV Service Modes
Note: I am not a technician and can not answer the technical questions some of you have been e-mailing me, sorry. Like many of yourselves, I am
simply an "end-user" who was unhappy with his TV's out-of-the-box performance and wanted information on how to adjust the preset image
values.
You would be surprised how many e-mail messages I receive asking for help with models not listed below but unfortunately, aside from any
information listed here there is nothing else I can offer. With that said if you e-mail me for help your request will more likely than not go
unanswered. I can only suggest you try asking around in the Usenet group sci.electronics.repair or reading Anthony W. Haukap's great How to
Adjust a TV FAQ. On the other hand, if you have any information to add, such as additional models for which these instructions work or instructions
for other models or brands please feel free to send them to me and I'll add them (with credit).
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. Also, see bottom
of page for user-sumbitted models that use these procedures (or slightly modified).
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.
( I had to press the power off button to exit the service menu.)
I got this info from a web site on thw web.
Thanks anyway. But I'm fine now.
