Knowledgebase:
**VeCOAX Series Troubleshooting Guide**
Posted by PVI Support, Last modified by PVI Support 202 PVI Support 202 on 02 November 2018 02:32 PM

VECOAX SERIES TROUBLESHOOTING FAQ

 

NO VIDEO

 Check for the TEST PATTERN using a test TV, using the unit’s basic setup with default settings.

1.       Connect unit to TV via coax cable.  DO NOT connect the HDMI source.

2.       Use default settings on the unit.  (To reset to default settings, press Enter and Escape simultaneously.  “Recall Default Settings” will appear.  Select “OK” and press enter.)

3.       Run channel scan on TV.  After the channel scan, the TV will find the default channel (1.1).

4.       Tune the TV to default channel.  TV will show test pattern ("No Valid Video Input.")

Check for TEST PATTERN using intended channel settings.

1.       On unit, set signal standard, Frequency (channel), Major & Minor Channel numbers to what you wish to use.

2.       Confirm that the Frequency is not being used by any other equipment and the Major/Minor channel number being used is unique.

3.       Run channel scan on TV.  TV will find the programmed channel.

4.       Tune to programmed channel.  TV will show test pattern ("No Valid Video Input.")

If no TEST PATTERN...

-          Check coax cable connection between TV and unit.  Test with a different cable if possible.

-          Check TV scan method.  Make sure TV is set to scan for the signal type (STANDARD) set on the unit’s menu.  (ATSC corresponds to Over the Air, J83B is QAM Digital cable, etc.)  FOR DEFAULT SETTINGS: set TV to scan for Auto or Cable.

-          In rare cases, some TVs may not be able to display the test pattern.  Rule this out by connecting a "dumb" HDMI signal source (e.g. DVD player), then scan for channels on the TV.

-          Test with another TV to rule out TV issue if possible.

If TEST PATTERN works but there is NO VIDEO from intended source…

-          Check HDMI cable connection between source and unit.  Disconnect HDMI source and reconnect it to establish a new HDMI handshake.  Test with a different cable if possible.

-          Check resolution settings on source.  Recommended setting is 1080p FIXED or 720p FIXED.  If the source is a computer, set display to “Extended mode” or “Extend these displays” and set to 1920x1080 or 1280x720.

-          On the unit, go to Advanced > Fixed EDID setting, and change from Auto to match the fixed resolution setting on the source.  For instance, if the source is set to 1080p Fixed, change Fixed EDID to 1080p.

-          Test with a different source (e.g. DVD player) if possible

-          If possible, test with a different TV with a different make/model.

-          Use default settings on the unit.  (To reset to default settings, press Enter and Escape simultaneously.  “Recall Default Settings” will appear.  Select “OK” and press enter.)

 

TV DOESN’T FIND THE UNIT’S CHANNEL DURING A CHANNEL SCAN

-          Make sure the TV has completed its channel scan.  (Channel scan time can range from 2 to 30 minutes or more and depends on the TV make/model.)

-          Check TV scan method.  Make sure TV is set to scan for the signal type (STANDARD) set on the unit’s menu.  (ATSC corresponds to Over the Air, J83B is QAM Digital cable, etc.)  FOR DEFAULT SETTINGS: set TV to scan for Auto or Cable.

-          If the steps above don’t work, on the unit’s menu, go to Advanced > Mixer Mode and set from Normal to Alternate, then rescan on the TV.

 

VIDEO IS CHOPPY, DISTORTED, PIXELATED

-          Check HDMI cable connection between source and unit.  Disconnect HDMI source and reconnect it to establish a new HDMI handshake.  Test with a different cable if possible.

-          Check Coax cable connection between unit and TV.  Test with a different cable if possible.

-          Check resolution settings on source, and ensure it’s set to one FIXED resolution.  Recommended setting is 1080p FIXED or 720p FIXED.  If the source is a computer, set display to “Extended mode” or “Extend these displays” and set to 1920x1080 or 1280x720.

-          On the unit, go to Advanced > Fixed EDID setting, and change from Auto to match the fixed resolution setting on the source.  For instance, if the source is set to 1080p Fixed, change Fixed EDID to 1080p.

-          Change Vid Quality on unit from “Low Latency” to “Average” or “High”.

-          If STANDARD is J83B (i.e. QAM), change MOD from QAM256 to QAM64.

-          Test with a different source (e.g. DVD player) if possible.

-          Check Signal Strength.  Signal strength that is too high can cause digital artifacts (blocks) to appear on screen.  To resolve, in the unit’s menu go to Advanced > RF Atten, then change from 0db - 15db and retest.

 

VIDEO DROPS OUT RANDOMLY OR WHEN I CHANGE CHANNELS ON SOURCE DEVICE

-          Check resolution settings on source, and ensure it’s set to one FIXED resolution.  Recommended setting is 1080p FIXED or 720p FIXED.  If the source is a computer, set display to “Extended mode” or “Extend these displays” and set to 1920x1080 or 1280x720.

-          On the unit, go to Advanced > Fixed EDID setting, and change from Auto to match the fixed resolution setting on the source.  For instance, if the source is set to 1080p Fixed, change Fixed EDID to 1080p.

-          Audio setting issues can also cause full video dropouts.  Check HDMI Audio Out settings on source device.  Set to Stereo PCM Linear or Dolby Digital 2 Channel (Uncompressed).

 

VIDEO CUTS OUT COMPLETELY AFTER A FEW HOURS OF USE

-          Some source devices (Set Top Boxes, etc.) have power-saving features that can turn off or de-sync the HDMI connection after hours of inactivity.  Check power settings on source device and turn off any power-saving modes.  (This will vary from device to device.)

-          Check resolution settings on source.  Recommended setting is 1080p FIXED or 720p FIXED.  If the source is a computer, set display to “Extended mode” or “Extend these displays” and set to 1920x1080 or 1280x720.

-          On the unit, go to Advanced > Fixed EDID setting, and change from Auto to match the fixed resolution setting on the source.  For instance, if the source is set to 1080p Fixed, change Fixed EDID to 1080p. 

 

UNIT DOESN’T WORK WITH VIDEO SWITCHERS OR MIXERS

-          Ensure the Video Switcher supports EDID.  EDID support is required for our modulators to understand the signal from HDMI source.

 

NO AUDIO OR POOR AUDIO (VIDEO IS WORKING)

-          Check HDMI Audio Out settings on source device.  Set to Stereo PCM Linear or Dolby Digital 2 Channel (Uncompressed).

-          Check other audio settings on source device to confirm audio is not turned off or muted.

-          Check HDMI cable connection between source and unit.  Disconnect HDMI source and reconnect it to establish a new HDMI handshake.  Test with a different cable if possible.

-          Test with a different source (e.g. DVD player) if possible.

 

AUDIO IS NOT IN SYNC WITH VIDEO

-          This may occur if the audio output goes separately to a sound system before video goes through the unit. You can purchase a audio delayer to sync the audio before it goes into your sound system or take the audio feed directly from the output of a TV tuned to the channel.

-          To fix, adjust the Audio Delay settings on the affected TV.  (This varies from TV to TV, see your TV documentation for more info.

 

UNIT WON’T POWER ON

-          Check the connection between the power supply and the unit.  The cable screws securely into the DC jack on the side of the unit. 

-          Check the connector, cable, and power supply to make sure there is no damage.

-          Check that you are using the original power supply for your model.

-          Test using a different power supply for this model, if one is available.

-          Test with a different known working outlet.

-          Ensure that all the nuts on the connector are secure and not loose.

 

 

LOSING OTHER CHANNELS WHEN CONNECTING UNIT TO EXISTING COAX NETWORK

-          There may be a channel conflict.  Check the unit’s Frequency and Major/Minor settings and make sure they do not match any other equipment in the network.

-          The unit’s signal output may oversaturate other signals on the network.  To attenuate the signal from the unit, in the menu go to Advanced > RF Atten, then change from 0db, in 5db to 10db increments, and retest.  Also consider amplifying the other signals in the network to achieve ideal balance.

 

NOT ALL OF MY TVS PICK UP THE CHANNEL(S) IN A NETWORK WITH MULTIPLE TVS

-          There may be a channel conflict.  Check the unit’s Frequency and Major/Minor settings and make sure they do not match any other equipment in the network.

-          There may be signal lost on the coax network between the unit and the affected TVs.  To check for this, remove the unit from the network and connect it directly to the affected TV.  Then, rescan for channels. 

-          If the above test works, add an amplifier to your network before the affected TVs.

 

MY TV DOESN’T ACCEPT DIGITAL SIGNAL (ANALOG ONLY)

-          Many older TVs (sold before 2009) only accept analog cable or over-the-air signals.  These TVs will require a digital converter box.  Typically, these are sold as Digital to Analog converter boxes or set top boxes.

-          If using a converter box, set the STANDARD on the unit’s menu to match the type of converter box.  (For Over-the-Air, set unit to ATSC.  For Cable, set unit to J83B.)

 

 

ON AIR LED LIGHT IS BLINKING OR OFF (POWER LIGHT IS ON)

-          Check resolution settings on source.  Recommended setting is 1080p FIXED or 720p FIXED.  If the source is a computer, set display to “Extended mode” or “Extend these displays” and set to 1920x1080 or 1280x720.

-          On the unit, go to Advanced > Fixed EDID setting, and change from Auto to match the fixed resolution setting on the source.  For instance, if the source is set to 1080p Fixed, change Fixed EDID to 1080p. 

 

 

tags

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