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Captain_Kurtz

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Reply with quote  #1 
    My Linkbox 8000 had been acting up lately - random freezing (not from signal issues), and I had to cycle the power a few times. Today, it really went haywire: every time I used the remote, it ignored whatever key I pushed and instead would endlessly cycle through the various screen resolutions (480i, 480p, 720p, 1080i, etc.). Very annoying.
    I took the remote apart and thoroughly cleaned (or so I thought) the contacts on the PCB and on the back of the keyboard membrane with QD Electronic Cleaner and a soft cloth. Put it back together, and same problem. Took the receiver apart to check the electrolytic capacitors - the two 16V / 1000uF caps on the output side of the power supply board looked OK (no bulging), but I removed them and tested them with my ESR meter (aka AC ohm meter), and compared them to a new capacitor. One was still within spec but the other was high, so I replaced both. Put the receiver back together, and still the same problem. Next, I tried using just the keys on the front panel of the receiver, and everything worked great! Hmmmmm, maybe the capacitor next to the IR receiver module is bad? So I take the receiver apart again, and remove the front panel PCB and remove the two 16V / 100uF, and compare both to a new, known-good capacitor of the same value. Both were way out of spec, so I replaced both. I also added a third capacitor where there was a space on the board for one, but none installed at the factory because there isn't room on the front of the PCB - a problem easily solved by installing it on the back. Reassembled the receiver again, and still the same problem!
    Next I tried controlling the receiver through the computer using a Slingbox, which uses an IR emitter to control the receiver, and everything worked - which means that the remote has to be the problem. So I look at the IR LED on the remote with the camera on my phone, and it's blinking like crazy with no buttons being pushed - one or more contacts are shorted. Take the remote apart again, clean the contacts again - one of them is still shorted. Cleaned the contacts three more times before the $%#@$# LED finally stopped blinking. Verified with the phone that the LED did blink when a key was pressed, put the remote back together, and now everything is back to normal.

Moral of the story: NEVER OPERATE THE REMOTE WHILE EATING FRIED CHICKEN.
rempfer

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Reply with quote  #2 
Quote:
Originally Posted by Captain_Kurtz

Moral of the story: NEVER OPERATE THE REMOTE WHILE EATING FRIED CHICKEN.

Wow, I read this post in the nick of time!  Thanks, Cap'n -- I've narrowly missed travelling this same long road to a successful diagnosis.  Whew!

EDIT:  Col. Sanders is not your friend!
Captain_Kurtz

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Reply with quote  #3 
Popeye's spicy. [smile]

The other lesson is never just assume something is fixed - verify it.
On the plus side, some of those capacitors did need to be replaced.
TimWinkle

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Reply with quote  #4 
Hi Captain, Can you let me know now how you got your remote apart? Mine is a 9000i Local. I don't see any screws inside. I'm  scared  to try to pry it apart. There is a little indent above the battery that looks like a small number "0" screw or a "00", but I looked pretty good at it and I don't think it is. I also have "0" & "00" screw drivers.

Thanks much,

Tom

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Ten foot Orbitron mesh dish, C, KU, 4d tv reciever and LinkBox 9000i. HTPC W/PROF PCIe Card
TimWinkle

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Reply with quote  #5 
Did it with a little help from Dr. Caylor. Used a thin bladed screw driver, like one of those pocket ones like the tool guys give away at Xmass. There is three little tabs on each side. About a little less than 2" down from the top and the other is about the middle. Came right apart. Cleaned it with a q-tip and alcohol and used the dry side of the q-tip to get most of the dirt off. I  think I'm going to buy some of that copper repair tape and some contact cleaner, like Majortom mentioned.

Thanks

Tom

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Ten foot Orbitron mesh dish, C, KU, 4d tv reciever and LinkBox 9000i. HTPC W/PROF PCIe Card
Captain_Kurtz

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Reply with quote  #6 
a guitar pick or a clam knife work too.

there are special tools, available on ebay and elsewhere cheap, for prying cell phones, remotes, tablets, etc. apart
TimWinkle

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Reply with quote  #7 
Thanks Captain I'll investigate. I love tools, big believer in having the right tools for the right job. Interesting, although I have nothing to complain about that little screw driver, it worked.

Tom

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Ten foot Orbitron mesh dish, C, KU, 4d tv reciever and LinkBox 9000i. HTPC W/PROF PCIe Card
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Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

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