sagetv extender schmatics

[jdaminc]

Are there any known schematics for these boxes floating around anywhere? There must have been something back in the day, to have them built.

[Sagetvmaster]

If anyone has them, Narflex would? Unless he had to turn everything over to Google in 2010.

[jdaminc]

well.... mostly troubleshooting random power failure on a hd100 mainboard... Or possibly a boot failure when it starts, it'll run all day long until the main power gets shut off. after that, it's hit and miss getting it to run again. Standby works all day long also when it starts up. working my way through the board when it doesnt start, compared to when it starts

[KeithAbb0tt]

This sounds similar to a problem many of us have with our HD300s. Sometimes after booting up, the HD300 is unable to "see" the network. When that happens, we have to unplug the power supply and the ethernet cable, plug the power supply back in, and wait until after the SageTV logo has been displayed (and removed) from the television. Then quickly plug the ethernet cable back in, and it is able to see the network again. Not sure if the HD100 has the same issue or not, but it's worth trying.

[jdaminc]

I dont even get a Sagetv logo when it doesnt start. the active light wont come on either....And then it works fine sometimes...

[KeithAbb0tt]

Were the power supply capacitors ever replaced on your HD100? That seems like it was an issue with them.

[jdaminc]

Yes I replaced them, and rechecked them

[TGsell1]

Not sure about the HD100 however on the HD300s I discovered that the onboard power supply was taking 9v down to 5v in a rather complicated way (inverter) and that was a frequent source of failure (intermittent too). I found the output of that which feeds the main caps and simply ‘hotwired’ a run of the mill 5V power supply to that directly and have resurrected two so far working perfectly. Perhaps the reason for the original design was that 5V supplies became commonplace years later. In any event it works! I posted this on the Sage Github forum.. but happy to clarify. From: jdaminc Sent: Tuesday, March 31, 2026 1:29 PM To: OpenSageTV/Community Cc: Subscribed Subject: Re: [OpenSageTV/Community] sagetv extender schmatics (Discussion #318) well.... mostly troubleshooting random power failure on a hd100 mainboard... Or possibly a boot failure when it starts, it'll run all day long until the main power gets shut off. after that, it's hit and miss getting it to run again. Standby works all day long also when it starts up. working my way through the board when it doesnt start, compared to when it starts — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[jdaminc]

I'm getting 3v and 5 volt across the board and at the front panel...Power supply is working as it should... may have narrowed the problem near the processor.. have to compare some readings again when the box boots up again

[jdaminc]

hd100 has its own separate 120v ac power supply that plugs into the mainboard like a computer would.. 5v dc at the output connector

[KryptoNyte-Sage]

Is there any way to contact folks here on the forum in a private message of some kind, so email addresses don't have to be exposed to the broader Internet?

[jdaminc]

Pretty sure there is no messenger or emailing links on here... at least none that I've found

[TGsell1]

Not sure I follow… if I recall the HD100 has a fully internal power supply eg 120v delivered to the back of the  box.  I believe there’s a known capacitor issue but besides that if you can find where the internal 5v ps outputs are you could hard wire in an external 5v supply and disconnect the internal one.  Just throwing it out there ….Sent from my iPhoneOn Mar 31, 2026, at 9:04 PM, jdaminc ***@***.***> wrote: hd100 has its own separate 120v ac power supply that plugs into the mainboard like a computer would.. 5v dc at the output connector —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[jdaminc]

its an internal power supply board separate from the main board. it uses a 4 pin connecter to supply the main board, and the front panel board and buttons. The power supply Isnt the problem. Caps were replaced long ago with higher voltage caps . I suppose after i get it working I could use a more energy efficient power supply with it

[TGsell1]

Gotcha Sent from my iPhoneOn Mar 31, 2026, at 8:49 PM, jdaminc ***@***.***> wrote: I'm getting 3v and 5 volt across the board and at the front panel...Power supply is working as it should... may have narrowed the problem near the processor.. have to compare some readings again when the box boots up again —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[jdaminc]

Well... did some testing.... pulled 2 caps... both were double the value of what they should be. At this point I'm gonna have to go through the board and replace what isn't in range. All the caps on this board are Chang brand. Pretty much the cheapest and lowest quality. but hey they lasted this long. will probably have replace them all.. Could also be the problem for the hd300s that require unplugging the lan to get it started. Possibly not enough voltage to do both at the same time when booting. I'll keep posting updates as I go.. gotta order parts, and repair a tv powerboard, and cassette deck in the meantime.. Thanks for the input you guys gave, it got me thinking about the booting problem, and lan problem people have.

BTW the date on the unit is 2-13 2008 it ran nonstop since it was bought

Thanks,
Jerry

[jdaminc]

I figured I would post an update.... After pulling and checking all the caps on the hd100, I found that 34 out of 36 were out of range. I replaced them all, and everything boots up and is working again.

Anyone with an hd 300 that has the booting and lan problem should probably check the caps. at least in the area where the video and lan are located. If I had one, I would investigate. Unfortunately I never bought one, after buying 2 hd200s.

Thanks,
Jerry

[KeithAbb0tt]

There is an external power supply for the HD300, which I think would mean fewer capacitors on the circuit board itself. There are actually two different versions of the circuit board for HD300s; version 1.0 and version 1.1. Version 1.0 had a few surface mount capacitors on the board, these look to have been replaced by "can" type capacitors for version 1.1. In the picture below, version 1.0 is on the left and version 1.1 is on the right:

It would be interesting to see if both versions are equally affected by the bootup problem, or if it is only a problem in one of the two versions.

[jdaminc]

interesting, I didnt know there were 2 versions. Where is the lan located on the boards? is it next to the power plug?

[KeithAbb0tt]

Yes, it is next to the power plug.

[jdaminc]

without seeing the traces on the bottom side, I would assume the large cap is taking the main power, and mabe splitting it to the processor and the back of the board.

[TGsell1]

Thanks Jerry.   That’s great info.  Sent from my iPhoneOn Apr 9, 2026, at 10:30 AM, jdaminc ***@***.***> wrote: I figured I would post an update.... After pulling and checking all the caps on the hd100, I found that 34 out of 36 were out of range. I replaced them all, and everything boots up and is working again. Anyone with an hd 300 that has the booting and lan problem should probably check the caps. at least in the area where the video and lan are located. If I had one, I would investigate. Unfortunately I never bought one, after buying 2 hd200s. Thanks, Jerry —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[KryptoNyte-Sage]

Jerry, I respect your desire and know-how to repair these SageTV devices! If for some reason you would like to have a "brand-newish" HD300, please post here and I'll see how I can make that happen.

[jdaminc]

Thanks for the offer....I dont really have a need for more media boxes, as I'v switched over my media to running a Mezzmo server with the add-on for Kodi on firestick.... works and acts very much like Sagetv....but blazing fast, and will play any media format. The only thing I still use Sagetv for is for recording ota, and my wife and grandkids still watch all their shows and movies on it.....(still trying to switch them over)
But for live tv and recording... you still cant find anything that does what Sage can do, especially with pausing, time shift and commercial skip. That said... If I did acquire a non-working (or semi working) HD 1-2 or 300 somewhere, I would make it another project and probably put it in service on another tv..

BTW... have you seen the prices for the HD boxes on ebay?..... crazy for the age of them

Thanks,
Jerry