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MediaPortal 1
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TV Server - No Signal all of a sudden
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<blockquote data-quote="mm1352000" data-source="post: 1186418" data-attributes="member: 82144"><p>Hi Craig</p><p></p><p>It's really <strong>really </strong>unusual for tuners to just up and die overnight as you described. Did you have extreme weather (eg. high winds, thunder/lightning, heavy rain, very hot/cold temperatures) on that night?</p><p></p><p></p><p>Yes, probably.</p><p></p><p></p><p><strong>Disclaimer: I take no responsibility for any consequences of performing the procedure described below.</strong></p><p></p><p>If you have a multimeter then you could attach a short cable to the tuner input and <strong>very</strong> <strong>carefully</strong> check the voltage between the inside core and outside braid/shield/socket. The voltage should be between 12 and 14 V when the tuner is trying to receive a transponder that broadcasts a vertically polarised signal, or between 18 and 20 V when the tuner is trying to receive a transponder that broadcasts a horizontally polarised signal. Note:</p><ol> <li data-xf-list-type="ol">All Freeview and Sky transponder signals in New Zealand are horizontally polarised.</li> <li data-xf-list-type="ol">You must perform the measurement while the tuner is trying to tune (eg. while scanning, EPG grabbing etc.). When inactive, most tuners will shut off the power supply to the LNB in order to save power.</li> <li data-xf-list-type="ol"><strong>Only some tuners have short-circuit protection.</strong></li> </ol><p><strong>Take great care (!!!) </strong>due to (3). If your tuner doesn't have short-circuit protection (there's no way to know in advance) and you make the mistake of short-circuiting the core and shield then you may damage the circuitry [on the tuner board] that supplies power to the LNB. Damaging the aforementioned circuitry would greatly reduce the usability of the tuner. It may not be 100% unusable, but it'd be a real pain in the backside because you'd have to find an alternative mechanism for supplying power to the LNB. If extremely unlucky, your motherboard and/or power supply could also be damaged. In practise the chances of that happening are probably slim, but it can happen.</p><p></p><p></p><p>I can't say due to the limited log files provided. Your MediaPortal reinstallation got rid of all of the log file history.</p><p></p><p></p><p>Nothing stands out in the TV Server log files.</p><p></p><p>Regards,</p><p>mm</p></blockquote><p></p>
[QUOTE="mm1352000, post: 1186418, member: 82144"] Hi Craig It's really [B]really [/B]unusual for tuners to just up and die overnight as you described. Did you have extreme weather (eg. high winds, thunder/lightning, heavy rain, very hot/cold temperatures) on that night? Yes, probably. [B]Disclaimer: I take no responsibility for any consequences of performing the procedure described below.[/B] If you have a multimeter then you could attach a short cable to the tuner input and [B]very[/B] [B]carefully[/B] check the voltage between the inside core and outside braid/shield/socket. The voltage should be between 12 and 14 V when the tuner is trying to receive a transponder that broadcasts a vertically polarised signal, or between 18 and 20 V when the tuner is trying to receive a transponder that broadcasts a horizontally polarised signal. Note: [LIST=1] [*]All Freeview and Sky transponder signals in New Zealand are horizontally polarised. [*]You must perform the measurement while the tuner is trying to tune (eg. while scanning, EPG grabbing etc.). When inactive, most tuners will shut off the power supply to the LNB in order to save power. [*][B]Only some tuners have short-circuit protection.[/B] [/LIST] [B]Take great care (!!!) [/B]due to (3). If your tuner doesn't have short-circuit protection (there's no way to know in advance) and you make the mistake of short-circuiting the core and shield then you may damage the circuitry [on the tuner board] that supplies power to the LNB. Damaging the aforementioned circuitry would greatly reduce the usability of the tuner. It may not be 100% unusable, but it'd be a real pain in the backside because you'd have to find an alternative mechanism for supplying power to the LNB. If extremely unlucky, your motherboard and/or power supply could also be damaged. In practise the chances of that happening are probably slim, but it can happen. I can't say due to the limited log files provided. Your MediaPortal reinstallation got rid of all of the log file history. Nothing stands out in the TV Server log files. Regards, mm [/QUOTE]
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