Vestel AK30 TV-DVD Combo – How to enter Service Mode – adjustments

CD update procedure – How to set Region – SMPS circuit diagram - How to enter Service Mode – adjustments.  Vestel AK30 TV-DVD Combo.  Used ICs: ST92195, STV224X  UV1315, UV1316, UV1336,TECC2949PG40B,TAEA-G0XXD, TDA7266/TDA7266L,TDA8174, TDA6107JF,  MC44608,  MSP34X0G, TDA1308  

CD Update Procedure

1. Any Player can be updated automatically with Update CD which contains proper files
2. Burn up CD within proper files (There should be no Volume Name for CD)
3. Open Tray and place update CD
4. You can see "Upgrade File Detected. Press Play to start" OSD message
5. Press Play button to start upgrade
6. You can see "File copying" OSD message for a few second
7. Tray is open automatically
8. No need for CD in tray; Take it from tray.
9. During upgrade procedure "CD upgrade start, Please wait.." indicator at OSD, and "UPG" indicator at VFD
10. Upgrade procedure takes about a few minutes, please wait if tray is open.
11. When CD update is finished tray is closed, screen is refreshed, update is finished.
12. To see Version Page:
• Press DISPLAY key. Setup Menu is displayed.
• Press “1”-“3”-“5”-“7” in Setup Menu when Video Setup Page is selected. Version Page is displayed.
• The 6th line (Build No) has both the hardware option (example: C6KN1) and the software build version
(example: 6027-13F) information.
• Press “DISPLAY” key to exit from Version Page.
Region Management
In Version Page by using Up and Down arrow keys the region code can be adjusted.

ENTERING TO SERVICE MENU

In order to enter service menu, first enter the main menu and then press the digits 4, 7, 2 and 5 respectively. 

To select adjust parameters, use Up or Dn buttons. To change the selected parameter, use Left or Right  buttons. 

Selected parameter will be highlighted. 

Press “TV” button to leave service menu.

SMPS CIRCUIT DIAGRAM

USING COLOUR BUTTONS ON SERVICE MENU

RED BUTTON : It switches the AVL to ON or OFF mode on service menu. AVL word is visible on service menu when AVL is on.

GREEN BUTTON : It switches to GEOMETRY adjust menu. Geometry of the picture is adjusted in this menu.

YELLOW BUTTON : It switches to VERTICAL SCAN DISABLE mode. It is useful to adjust screen voltage.

BLUE BUTTON : It is used to adjust AGC and IF automatically on service menu.

Service Mode Adjustments

IF Adjustments

IF1: IF Coarse Adjustment 003

IF2: IF Fine Adjustment 073

IF3: IF Coarse Adjustment for L-prime 004

IF4: IF Fine Adjustment for L-prime 065

IF NEGATIVE ADJUSTMENT (WITHOUT L’ SYSTEMS) 

Set the video pattern to a PAL colour bar pattern with frequency 38.9 MHz. Apply this IF signal to PIN-10 and PIN-11 of tuner. Press PROG-1 and after that BLUE (INSTALL)button from remote controller. Select the standard as BG or I. (if BG is not available) Enter service menu. Select IF1 parameter from service menu and press BLUE (INSTALL) button from remote controller. IF adjustment will be done automatically by software.

IF POSITIVE ADJUSTMENT (WITH L’ SYSTEMS) 

Set the video pattern to a SECAM-L colour bar pattern with frequency 33.9 MHz. Apply this IF signal to PIN-10 and PIN-11 of tuner. Press PROG-1 and after that BLUE (INSTALL)button from remote controller. Select the BAND VHF-1 (S1 – S4 for PLL tuners) and standard as L’. Enter service menu. Select IF1 parameter from service menu and press BLUE (INSTALL) button from remote controller. IF adjustment will be done automatically by software.

AGC: Automatic Gain Control

In order to do AGC adjustment, enter a 60µdBV RF signal level from channel C-12 (224.25 MHz)

Select AGC parameter from service menu. Press BLUE (INSTALL) button from remote controller.

The adjustment will be done automatically by software. See the AGC indicator on service menu, it must be 1. Check that picture is normal at 90dBµV signal level.

Min. Value: 000 Max. Value: 063 Recommended Value: Automatically, described above.

SCREEN ADJUSTMENT: (FBT Screen)

Enter service menu by pressing “MENU” and “4, 7, 2, 5” or press the mute and info buttons at the same time from remote controller. Then press yellow button to disable vertical scan. Adjust horizontal line via screen pot. as thin as possible. Press yellow button again to enable vertical scan. 

Press “TV” button to leave (Exit) service menu.

RGBH: RGB Mode Horizontal Shift Offset

Enter a RGB circle test pattern via video inputs. Force the TV to RGB mode by pressing AV button from remote controller. Change RGB Horizontal Position till the picture is horizontally centered. Check and readjust RGBH item if the adjustment becomes improper after some other geometric adjustments are done. Min. Value: 000 Max. Value: 063 Default Value : 007

VSOF: Vertical Size Offset for 60 Hz

Enter an NTSC-M circle test pattern via RF or video inputs. Change Vertical Size until the checkered parts of test pattern on both of upper and lower side disappear. Check and readjust Vertical Size item if the adjustment becomes improper after some other geometric adjustments are done. Min. Value: -08 Max. Value: +55 Recommended Value: -16.

VPOF: Vertical Position Offset for 60 Hz

Enter an NTSC-M circle test pattern via RF or video inputs. Change Vertical Position till the picture is vertically centered. Check and readjust Vertical Size item if the adjustment becomes improper after some other geometric adjustments are done. Min. Value: -08 Max. Value: +55 Recommended Value: +09

HSOF: Horizontal Size Offset for 60 Hz Not Used For This Model

HPOF: Horizontal Position Offset for 60 Hz

Enter an NTSC-M circle test pattern via RF or video inputs. Change Horizontal Position till the picture is horizontally centered. Check and readjust Horizontal Position item if the adjustment becomes improper after some other geometric adjustments are done. Min. Value: -08 Max. Value: +55 Recommended Value : -06.

HTOF: Horizontal Trapezoid Offset for 60 Hz Not Used For This Model.

VSIZ: Vertical Size for 50 Hz 

Enter a PAL B/G circle test pattern via RF. Change VSIZ (Vertical Size) until horizontal black lines on both the upper and lower part of the test pattern become very close to the upper and lower horizontal sides of picture tube and nearly about to disappear. Check and readjust Vertical Size item if the adjustment becomes improper after some other geometric adjustments are done. Min. Value: 000 Max. Value: 063 Recommended Value for 4:3 mode 030 Recommended Value for 16:9 mode 063.

VPOS: Vertical Position for 50 Hz

Enter a PAL B/G circle test pattern via RF. Change Vertical Position till the test pattern is vertically centered. Horizontal line at the center pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust Vertical Position item if the adjustment becomes improper after some other geometric adjustments are done.

Min. Value: 000 Max. Value: 063 Recommended Value for 4:3 mode 014 Recommended Value for 16:9 mode 020

VSCO: Vertical S-Correction for 50 Hz Not Used For This Model.

VCCO: Vertical Corner Correction for 50 Hz Not Used For This Model.

HSIZ: Horizontal Size for 50 Hz Not Used For This Model.

HPOS: Horizontal Position for 50 Hz

Enter a PAL B/G circle test pattern via RF. Change Horizontal Position until the picture is horizontally centered. Check and readjust Horizontal Position item if the adjustment becomes improper after some other geometric adjustments are done. Min. Value: 000 Max. Value: 063 Recommended Value for 4:3 mode 032 Recommended Value for 16:9 mode 033.

HPIN: Horizontal Pincushion for 50 Hz Not Used For This Model.
HCCO: Horizontal Corner Correction for 50 Hz Not Used For This Model.
HTRP: Horizontal Trapezoid for 50 Hz Not Used For This Model.
VZSZ: Vertical Zoom Size for 50 Hz Not Used For This Model.

WHITE BALANCE ADJUSTMENT 

The following three parameters are used to make white balance adjustment. To do this, use a Colour Analyzer. Using WR (White point adjust for RED), WG (White point adjust for GREEN), WB (White point adjust for BLUE) parameters, insert the + sign in the square which is in the middle of the screen.

WR: White Point Adjustment for RED Use this parameter to set the strength of RED in White. Min. Value: 000 Max. Value: 063 Default Value : 030

WG: White Point Adjustment for GREEN Use this parameter to set the strength of GREEN in White. Min. Value: 000. Max. Value: 063 Default Value : 018

WB: White Point Adjustment for BLUE Use this parameter to set the strength of BLUE in White. Min. Value: 000 Max. Value: 063 Default Value : 020

BR: Bias for RED Use this parameter to set the strength of RED in BLACK. Min. Value: 000 Max. Value: 063 Default Value : 031

BG: Bias for GREEN Use this parameter to set the strength of GREEN in BLACK. Min. Value: 000 Max. Value: 063 Default Value : 031

APR: Automatic RGB Peak Regulation (APR) Threshold

The goal of the APR function (Automatic RGB peak regulation) is to compensate the spread of contrast between sources or programs by regulating the peak amplitude of RGB signals. This results in a picture with higher contrast whatever the input signal amplitude. Besides, APR increases the contrasts of pictures with low contrast and avoids the clipping at RGB output for pictures with high amplitude. To enable APR, refer to OP3 in Option Bytes. Min. Value: 000 Max. Value: 015 Default Value : 006 The following default values are the factory settings of the corresponding items. Except Volume, all values are restored when STANDARD button is pushed during no menu is displayed. Volume is set to its default value only if the A.P.S. bit is set when the TV is turned on.

AVL: Automatic Volume Control

In order to make AVL ON or AVL OFF, press the RED button while in service menu. If AVL is ON, the AVL string occurs on the bottom right of the service menu screen. If AVL is OFF, no string occurs about AVL on the bottom of the service menu.

FMP1: FM Prescaler when AVL is OFF Min. Value: 000 Max. Value: 127 Recommended Value: 009

NIP1: NICAM Prescaler when AVL is OFF Min. Value: 000 Max. Value: 127 Recommended Value: 021

SCP1: SCART Prescaler when AVL is OFF Min. Value: 000 Max. Value: 127 Recommended Value: 008

SEC1: SECAM Prescaler when AVL is OFF Min. Value: 000 Max. Value: 127 Recommended Value: 008

FMP2: FM Prescaler when AVL is ON Min. Value: 000 Max. Value: 127 Recommended Value: 016

NIP2: NICAM Prescaler when AVL is ON Min. Value: 000 Max. Value: 127  Recommended Value: 018

SCP2: SCART Prescaler when AVL is ON Min. Value: 000 Max. Value: 127 Recommended Value: 017

SEC2: SECAM Prescaler when AVL is ON Min. Value: 000 Max. Value: 127 Recommended Value: 000