Belson BSV-2751 Service Manual Download Page 6

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When the machine is switched off it is possible to exit from the factory state.
3.1. EEPROM Initialization
Enter the first page of the factory menu, select EEPROM Erase and then press”ENTER” key. Switch
the TV set off and restart the set. Then it’s ready for initialization.

Note: For the restart it takes relatively longer time to show blue screen!

3.2. Check on white balance
3.2.1. White balance for YpbPr channel

Connect the signal of 480I(968 mode)in VG-848 to YpbPr port. Input the signal of gray degree 16

(921 graph spectrum). Fix the R Gain, G Gain and B Gain of the White Balance Adjust as 80H, 80H, and
80H.Set the R Offset, G offset and B offset of the 9883 Adjust items so that the color coordinates of the
4

step from the left are 254 and 250 and the brightness is 3.5nit. Check if the color coordinates of the

step (4

step from the right) are 267 and 267 and if the brightness is 400 nit. If not, recheck the

brightness and color coordinates of the 4

step and repeatedly adjust R Offset, G offset, B offset until the

two gray degrees are both adjusted to the specified values.

Separately input the signals of other formats in Table 1. Repeat the operations above so that the

white balance is up to the requirement as above.

4. Performance check

4.1. TV function

Connect RF port to the central signal source. First enter the menu for selected items. Set the

category of country. Then enter edit menu

→

auto station searching and check if there is skipped

stations. Check for manual station searching to see if fine adjustment is normal. Check if the output of
earphone and loudspeaker is normal and if the image is normal. Switch on PIP and POP(multi
pictures),connect earphone wire and check if the display and sound are normal.
4.2. AV/S-Video port

Separately input the signals from the terminals of AV/S and check if the display and sound are

normal. Switch on PIP and POP(multi pictures),connect earphone wire and check if the display and
sound are normal.
4.3. SCART port(Note: When checking SCART port,the mode displayed on the menu for selection items
should be Auto)
4.3.1. Check of the special function of SCART INPUT
4.3.1.1. Function of SCART1

a).When the TV set is switched on, connect SCART1 to the signal generator(PM54200).Then the

TV set should be automatically switched over to the state of Scart1.

b).SCART signal generator sends out CVBS signal(color multi-wave group).Observe if the

image and sound of the set are normal. Change the display format (16:9 and 4:3) of the image output
from the signal source. Check if the TV set can automatically identify it. When SCART signal is changed
into that of RGB,observe if the image and sound of the set are normal. Change the display format (16:9
and 4:3) of the image output from the signal source. Check if the TV set can automatically identify it.
Switch on PIP,connect the earphone and check if the display and sound are normal.
4.3.1.2. Function of SCART2

a). When the TV set is switched on, connect SCART2 to the signal generator(PM54200).Then the

TV set should be automatically switched over to the state of Scart2.

b).SCART signal generator sends out CVBS signal(color multi-wave group).Observe if the

image and sound of the set are normal. Change the display format (16:9 and 4:3) of the image output
from the signal source. Check if the TV set can automatically identify it. Now the normal screen display