Go Back   Techwatch forums > Tech Forums > Satellite TV > Satellite Help

Satellite Help Anything satellite related

Reply
 
LinkBack Thread Tools
Old 13-02-11, 11:53 PM   #1 (permalink)
Junior Member
 
Join Date: Feb 2011
Posts: 6
Default How to check an LNB for faults?

Hi,

I have had two humax boxes die in a row. Before I plug the third one into the system I want to be 100% sure that I am just very unlucky and confirm that there is nothing wrong with the set up or lnb.

What is the best way of testing an lnb? Have tested for shorts at the sockets and get about 5Mohm. sound ok? What else can I check?

Cheers
Geerdub is offline   Reply With Quote
Old 14-02-11, 02:11 PM   #2 (permalink)
Installer/Design Engineer
 
pedro2000uk's Avatar
 
Join Date: Jun 2009
Location: Cheshire
Posts: 369
Default Re: How to check an LNB for faults?

Quote:
Originally Posted by Geerdub View Post
..... What else can I check?

also check any of your media gear it's connected to for stray voltage faults etc..
__________________
..Satellite Installer-.. Cheshire/ Manchester/ Staffs/ Derbyshire/ N Wales/ Shrops/ Yorks/ Notts...motorised & fixed, small, medium & BIG
pedro2000uk is offline   Reply With Quote
Old 14-02-11, 02:17 PM   #3 (permalink)
Junior Member
 
Join Date: Feb 2011
Posts: 6
Default Re: How to check an LNB for faults?

Cheers Pedro,

The only other connection apart form the LNB is the HDMI cable to the 6 Series 6 Samsung LEDtv.

I did notice when the second humax died that the back of the box felt tingly to the touch and this went away when I pulled the HDMI....

Does that make sense that there could be stray voltage from the TV killing the Humax?

Fualty TV- Faulty HDMI cable? Whats best way to check? Get a pinout for an HDMI cable and check voltages?

Many thanks
Geerdub is offline   Reply With Quote
Old 14-02-11, 07:41 PM   #4 (permalink)
Junior Member
 
Join Date: Feb 2011
Posts: 6
Default Re: How to check an LNB for faults?

Right, further investigation shows 45vac on standby and 60vac potential between tv case (and hdmi shield) and house ground.

That does not seem right! Warranty call to Samsung I think.

Pretty sure Rhys what could have killed the humax. Any thoughts on this anyone?
Geerdub is offline   Reply With Quote
Old 14-02-11, 07:42 PM   #5 (permalink)
Junior Member
 
Join Date: Feb 2011
Posts: 6
Default Re: How to check an LNB for faults?

Dunno who Rhys is! Bloody iPhone auto spelling!
Geerdub is offline   Reply With Quote
Old 14-02-11, 08:26 PM   #6 (permalink)
Installer/Design Engineer
 
pedro2000uk's Avatar
 
Join Date: Jun 2009
Location: Cheshire
Posts: 369
Default Re: How to check an LNB for faults?

Does it say anything in the Humax manual about whether it has to be earthed, even though it has a no earth lead/plug? Does the flat screen have an earthed mains lead/plug.
__________________
..Satellite Installer-.. Cheshire/ Manchester/ Staffs/ Derbyshire/ N Wales/ Shrops/ Yorks/ Notts...motorised & fixed, small, medium & BIG
pedro2000uk is offline   Reply With Quote
Old 14-02-11, 08:39 PM   #7 (permalink)
Junior Member
 
Join Date: Feb 2011
Posts: 6
Default Re: How to check an LNB for faults?

Curiously the label on the humax lead says "This appliance must be earthed" even though the cable looks like twin only. Has metal earth pin. This is a pre wired and permanently attached lead.

Samsung tv is a figure 8 kettle lead ( definitely no earth).

Could this measurement just be a crazy ground loop?
Geerdub is offline   Reply With Quote
Old 14-02-11, 10:20 PM   #8 (permalink)
Grumpy Old Sat Man
 
kerrywez's Avatar
 
Join Date: Sep 2007
Location: Co. Kerry, Ireland
Posts: 2,471
Default Re: How to check an LNB for faults?

The HDMI lead does carry a charge, but it should only be DC and very small, something like a USB does. If I were you I would give Sammy a call and ask what the score is and let them know that you have burnt two Humy boxes and do not want to burn another one.

Regards Wez
__________________
Dreambox 7025, 250HDD, Dreambox 500s, 110 X 90Cm Hirschmann on Clarketech rotor, 1.2 Mtr. Channel Master. AZBox HD Running on E2. TM6900 super combo.
kerrywez is offline   Reply With Quote
Old 14-02-11, 10:29 PM   #9 (permalink)
Junior Member
 
Join Date: Feb 2011
Posts: 6
Default Re: How to check an LNB for faults?

Cheers Wez.

Will call them in the morning and see what they say.
Geerdub is offline   Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
how to check stealth and burn xbox 360 games phil_88 Microsoft Xbox 1 19-11-10 09:54 PM
Best Quad LNB Curious123 Satellite Help 7 30-09-10 06:56 PM
LNB for W coast for France m47 Satellite Help 2 30-09-10 06:13 AM
LNB problem toto Satellite Help 5 18-06-10 06:06 PM
Which LNB do I clamp for astra hotbird set up? madscientist Satellite Help 4 04-06-10 04:19 PM


All times are GMT +1. The time now is 02:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.0 PL2 ©2011, Crawlability, Inc.