Vestel All model TV Service menu
Vestel All model chassis 11AK19
Vestel chassis 11AK19 Factory mode ADJUSTMENTS PROCEDUREIn order to enter the service mode, first enter the installation menu (or press blue button on the remote
control handset) and then press the digits 4, 7, 2 and 5 respectively.
For ADJUST Vestel chassis 11AK19 settings:
Select Adjust using Channel down or Channel up button and press volume down or or volume up button to enter it. To select different adjust parameters, use down or up button.
To change the selected parameter, use > or < button.
Vestel chassis 11AK19 WHITE BALANCE ADJUSTMENT:
The following three parameters are used to make white balance adjustment. To do this, use a Colour Analyser. Using white point RED, white point GREEN and white point BLUE parameters, insert the + sign in the square which is in the middle of the screen.
ADJUST 00 = White Point RED
ADJUST 01 = White Point GREEN
ADJUST 02 = White Point BLUE
AGC ADJUSTMENT Vestel chassis 11AK19:
In order to do AGC adjustment, enter a 60dBmV RF signal level from channel C-12.
Connect a digital voltmeter to pin 1 of the tuner. Change the AGC parameter until you see 3.70VDC on voltmeter display. Check that picture is normal at 90dBmV signal level.
IF-PLL NEGATIVE ADJUSTMENT (Only with PLL tuner):
Connect 38.9 MHz test pattern for PAL B/G, PAL-SECAM B/G, 39.5 MHz test pattern for PAL I or 45.75 MHz test pattern for PAL M/N, NTSC M model to Z401 SAW filter input terminals. Change the IF-PLL Negative parameter until you see IN, DOWN below. If you cannot catch IN, DOWN position this way, using a screwdriver rotate the VIF-COIL LT401 left or right until you see IN, DOWN.
IF-PLL POSITIVE ADJUSTMENT (Only with PLL tuner):
Connect 33.9 MHz test pattern for SECAM L’ model to Z401 SAW filter input terminals. Change the IF-PLL Positive parameter until you see IN, DOWN below. If you cannot catch IN, DOWN position this way, using a screwdriver rotate the VIF-COIL LT401 left or right until you see IN, DOWN.
LUMINANCE DELAY ADJUSTMENT (with only TDA 8844 video processor):
Y-Delay PAL
Enter a PAL B/G colour and black-white bar test pattern via RF. Adjust Y-Delay PAL till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note: If the SAW filter is one of the G1965M, J1951M, J3950M, K2958M, K2962M, G3957M, K6256K, K6259K or M1963M, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
Vestel All model TV Service menu
Photo credit : meddiodesign.com
Vestel chassis 11AK19
Y-Delay SECAM
Enter a SECAM B/G colour and black-white bar test pattern via RF. Adjust Y-Delay SECAM till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note: If the SAW filter is one of the G1965M, K2958M, K2962M, G3957M, K6256K or K6259K, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS.
This means the adjustment must be set to the maximum value.
Y-Delay NTSC
Enter an NTSC colour and black-white bar test pattern via RF. Adjust Y-Delay NTSC till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible.
Note: If the SAW filter is M1963M, there is constant group delay distortion, so for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS. This means the adjustment must be set to the maximum value.
Y-Delay Other
In case of other colour systems, enter this system with colour and black-white bar test pattern via RF. Adjust Y-Delay Other till the colour transients on the colour bar of the pattern become as sharper and colours between transients do not mix with each other as possible. Normally for an equal delay of the luminance and chrominance signal the delay must be set at a value of 160nS.
This means the adjustment must be set to the maximum value.
VERTICAL ZOOM ADJUSTMENT (only for 110ø picture tubes):
Enter a PAL B/G circle test pattern via RF. Change vertical zoom till you see the upper and lower limit of the circle as close to the upper and lower limit of the picture tube as possible.
VERTICAL SCROLL ADJUSTMENT (only for 110ø picture tubes):
Enter a PAL B/G circle test pattern via RF. Change vertical scroll till you see the circle exactly in the middle of the screen.
Vestel chassis 11AK19 HORIZONTAL SHIFT ADJUSTMENT:
Enter a RED PURITY test pattern via RF.Change horizontal shift till the picture is horizontally centred. Check whether this adjustment is correct after completing Service Mode Adjustment.
Vestel chassis 11AK19 VERTICAL SLOPE ADJUSTMENT:
Enter a CROSS-HATCH B/G test pattern via RF. Change vertical slope till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern. Check and readjust VERTICAL SLOPE item if the adjustment becomes improper after some other geometric adjustments are done.
Vestel chassis 11AK19 VERTICAL AMPLITUDE ADJUSTMENT:
Enter a PAL B/G test pattern via RF. Change vertical slope till 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 AMPLITUDE item if the adjustment becomes improper after some other geometric adjustments are done.
Vestel chassis 11AK19 S-CORRECTION ADJUSTMENT:
Enter a PAL B/G circle test pattern via RF. Change S-correction till the middle part of the circle is as round as possible.
Vestel chassis 11AK19 VERTICAL SHIFT ADJUSTMENT:
Enter a PAL B/G test pattern via RF. Change Vertical Shift till the test pattern is vertically centred, i.e. horizontal line at the centre pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust Vertical Shift item if the adjustment becomes improper after some other geometric adjustments are done.
EW WIDTH ADJUSTMENT (only for 110ø picture tubes):
Enter a PAL B/G test pattern via RF. Change EW Width till the vertical black and white bars on both left and right side of the pattern exactly disappear.
EW PARABOLA WIDTH ADJUSTMENT (only for 110ø picture tubes):
Enter a PAL B/G test pattern via RF. Change EW Parabola Width till vertical lines close to the both sides of the picture frame become parallel to vertical sides of picture tube. Check and readjust EW Parabola Width item if the adjustment becomes improper after some other geometric adjustments are done.
EW CORNER PARABOLA ADJUSTMENT (only for 110ø picture tubes):
Enter a PAL B/G test pattern via RF. Change EW Corner Parabola till vertical lines at the corners of both sides of picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust EW Corner Parabola item if the adjustment becomes improper after some other geometric adjustments are done.
EW TRAPEZIUM ADJUSTMENT (only for 110ø picture tubes):
Enter a PAL B/G test pattern via RF. Change EW Trapezium till vertical lines, especially lines at the sides of the picture frame became parallel to the both sides of picture tube as close as possible. Check and readjust EW Trapezium item if the adjustment becomes improper after some other geometric adjustments are done.
HORIZONTAL SHIFT ADJUSTMENT:
Enter a RED PURITY test pattern via RF.Change horizontal shift till the picture is horizontally centred. Check whether this adjustment is correct after completing Service Mode Adjustment.
VERTICAL SLOPE ADJUSTMENT:
Enter a CROSS-HATCH B/G test pattern via RF. Change vertical slope till the size of squares on both the upper and lower part of test pattern become equal to the squares laying on the vertical centre of the test pattern. Check and readjust VERTICAL SLOPE item if the adjustment becomes improper after some other geometric adjustments are done.
VERTICAL AMPLITUDE ADJUSTMENT:
Enter a PAL B/G test pattern via RF. Change vertical slope till 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 AMPLITUDE item if the adjustment becomes improper after some other geometric adjustments are done.
S-CORRECTION ADJUSTMENT:
Enter a PAL B/G circle test pattern via RF. Change S-correction till the middle part of the circle is as round as possible.
VERTICAL SHIFT ADJUSTMENT:
Enter a PAL B/G test pattern via RF. Change Vertical Shift till the test pattern is vertically centred, i.e. horizontal line at the centre pattern is in equal distance both to upper and lower side of the picture tube. Check and readjust Vertical Shift item if the adjustment becomes improper after some other geometric adjustments are done.