Bang & Olufsen BeoVision 7 MK II, Руководство по обслуживанию

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2.6 Fault flow chart
Fault symptom:
- No picture
- Status display OK (source)
Possible causes:
- No backlight
- Fault in video path
- LCD defect
- Defect connection
- Defect RF link amplifier
Picture
Press MENU on Beo4
- - - - - - - -
OSD on display?
- - - - - - - -
Video path to LCD
SCALER & LCD
Action
- - - - - - - -
Confirm
- - - - - - - -
Checked
Visual inspection of
backlight, through
ribbons in backcover
- - - - - - - -
Backlight lit?
- - - - - - - -
LCD active
No backlight
See next page
Press TV on Beo4
- - - - - - - -
Snow or poor picture?
- - - - - - - -
TV tuner and video
path
Check if “DECODER
ON” in TV MANUAL
TUNING
- - - - - - - -
Decoder ON
- - - - - - - -
User setting
Connect ServiceTool
to BeoVision 7
- - - - - - - -
Prepare for Scaler Test
Pattern
Set “DECODER ON”
in TV MANUAL
TUNING
- - - - - - - -
Picture OK?
- - - - - - - -
User setting
Communication
between ServiceTool
and BeoVision 7 OK?
- - - - - - - -
Scaler PCB + ML
connection
Check antenna
connection
- - - - - - - -
Connection between
antenna output and
BeoVision 7
- - - - - - - -
Antenna connection
Reestablish the
connection
- - - - - - - -
Picture OK?
Activate a test picture
in the Scaler Test
Picture Menu
- - - - - - - -
Picture OK?
- - - - - - - -
Video path Scaler to
LCD
Connect antenna
directly to tuner
- - - - - - - -
Picture OK?
- - - - - - - -
RF Link amplifier
Perform a manual TV
tuning
- - - - - - - -
Picture OK?
Replace Main chassis
(Module 999)
Check W20 RGB
connection
- - - - - - - -
Connection OK?
- - - - - - - -
Cable connection
Reestablish
connection
- - - - - - - -
Picture OK?
Replace Main chassis
(Module 999)
2
3
4
5
6
Replace
RF Link amplifier
No
Yes