Cisco Cisco Explorer Set-top Software Version 2.1 Mode D'Emploi
Subscribers Are Seeing a Black Screen on a Digital Channel
749244 Rev G
197
Subscribers Are Seeing a Black Screen on a
Digital Channel
Description
The channel number appears in the channel banner on the TV screen but no picture
is displaying for digital channels on the television screen.
Possible Causes
An authorization issue exists at the source.
Tuning a high definition (HD) stream with a standard definition (SD) DHCT.
RF signal is lost.
QAM signal is lost.
Diagnosing the Issue
See the following table to diagnose why subscribers are seeing a black screen.
Access the following
diagnostic screen.
diagnostic screen.
Evaluate the
following field.
following field.
What value do I want to see?
Page 1—Status Summary
Tuner
Frequency level of inband tuner
should display in the "white"—
acceptable value
should display in the "white"—
acceptable value
-8 dBmV to +8 dBmV—
desired value
desired value
Note: If the tuner value
appears in amber or red,
check the RF signal levels. If
the signal levels are within
range and you still have an
issue, contact Cisco Services.
appears in amber or red,
check the RF signal levels. If
the signal levels are within
range and you still have an
issue, contact Cisco Services.
Page 4—Statuses and
Network Parameters
Network Parameters
MPEG STATS/Video Non–0 number—digital channels
0—the DHCT is not receiving the
video stream. Check the RF signal
levels
video stream. Check the RF signal
levels
n/a—analog channels
MPEG STATS/Video Non–0 number—digital channels
0—the DHCT is not receiving the
video stream. Check the RF signal
levels
video stream. Check the RF signal
levels
n/a—analog channels