Re: Help with capacitor substitution for a DVR

After having a brief look at all the other DVRs, two the exact same model and three others, none of them had [B]visibly[/B] failed capacitors.

Part of the reason I'm leery with substitution is knowing there was what the design engineers had wanted and then what was actually used due to cost reduction measures. Straying from what was used likely takes it further away from what the original design specifications.

While longer rated capacitor lifetime would be good, it would be pointless unless I recap the...

Re: Help with capacitor substitution for a DVR

The cluster two 2200μF caps are close to the circuit board, it's the 1000μF that aren't. I'm sure it's not just them trying to use up overstock ultra low ESR capacitors - at least two [B]different[/B] manufacturers (Pace & Thomson) and models (HR20-700 and HR21-100) have them. Looking at some of the other power supply boards listed on eBay, the revised version of this DVR (HR22-100) from the same manufacturer (Thomson) also has the same capacitors. I don't know what the design reasoning is, just that's what it has. The...

Re: Help with capacitor substitution for a DVR

I've attached some pictures of the power supply board from an [URL=https://www.ebay.com/itm/DirecTV-HD-Receiver-Model-HR21-100-HD-POWER-SUPPLY-REPLACEMENT-BOARD/233149174367]eBay listing[/URL] - it appears to have all the same capacitors. So, it doesn't seem to be from someone else previously replacing them. I have two more of these (same model) that I'll be replacing the fans in as well, so that should further confirm they're original.

The only voltages I know for sure it outputs are +5VDC and +12VDC (which is standard)...

Re: Help with capacitor substitution for a DVR

It's a DirecTV DVR HR21-100 made in March 2008 (by Thomson).

It has six MCZ series on the power supply board, and five of them on the main board. Both boards have other various model capacitors - a very quick look shows some ZL and ZLH Rubcon's among a few other makes.

The HR20-700 DVR (made by Pace) that was their first that had MPEG4 support (circa 2006), also had ultra low ESR capacitors on both of its boards (this one has a combo power supply/main board and then a tuner board). Those had issues with...

I have a DVR that I was replacing the fan in, and noticed one of the capacitors on the power supply board had failed (all others are fine). It was slightly domed with the bottom pushed out. It's a Rubycon 2200μF 10V MCZ - so it's ultra low ESR. Since these have been discontinued, there isn't a direct replacement. I've tried finding something with similar specs, and what I think will work is the RNL series from Nichicon - [URL=https://www.digikey.com/product-detail/en/nichicon/RNL1C222MDS1/493-16394-ND/7427972]specifically this one[/URL]. It's the same capacitance, slightly higher voltage...

Re: New Members - please post your introductions here

Greetings, I'm an occasional visitor/information seeker who now has a question to ask, so I'm finally making my first post here.