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Do you think that its smart or necessary to invest in a temperature controlled soldering iron for this job? Or is that overkill? I have never soldered anything in my life. Looks like you can buy a Temp Adjusting Iron by Hakko for about $90.
 

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Handy piece of equipment. Don't skimp on cost, but no need to spend hundreds either. Easiest way is to look up models on Amazon and red the reviews. Be sure you get extra tips of various sizes & types. Also, don' forget solder wick and a solder sucker to remove the existing solder.

Make a number of practice soldering tests, first with two pieces of wire, then if you can find a old circuit board that is bad, experiment with that. ;)
 

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Do you think that its smart or necessary to invest in a temperature controlled soldering iron for this job? Or is that overkill? I have never soldered anything in my life. Looks like you can buy a Temp Adjusting Iron by Hakko for about $90.
I used a, single speed, 25W Weller soldering pencil (think I paid less than $20) for cap replacement. Works just fine; but, the tip must be clean and tinned, the work must be clean.

Good advice posted about practice, practice, practice...
There are some good youtube videos on PCB component replacement, too.
 

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Do you think that its smart or necessary to invest in a temperature controlled soldering iron for this job? Or is that overkill? I have never soldered anything in my life. Looks like you can buy a Temp Adjusting Iron by Hakko for about $90.
That's more and fancier than you need for a TiVo power supply.

I don't recommend a lot of their stuff (especially the version of solder wick they changed to a few years ago), but Radio Shack has a de-soldering iron that looks like a soldering iron (pencil style, not gun style) with a turkey baster attached--it's a rubber squeeze bulb:you squeeze it and hold it that way and then use the tip to melt the old solder and then release the bulb to suck it away. You can use it to apply heat to the work to melt new solder when soldering in the new caps on something simple like the TiVo power supply board.

Get some rosin core solder to use with it made out of just lead and tin, a 63/37 or 60/40 ratio. Anything with anything else, like silver, will drive you nuts trying to get it to melt.

You can use the iron to melt some new solder into the old solder to get the old stuff to melt.

There, I just saved you at least $60.
 

· Grumpy Old Man
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Do you think that its smart or necessary to invest in a temperature controlled soldering iron for this job? Or is that overkill? I have never soldered anything in my life. Looks like you can buy a Temp Adjusting Iron by Hakko for about $90.
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Here is a simple 60w pin great for using around the house.

http://www.amazon.com/Meter®-Watts-...im_469_76?ie=UTF8&refRID=00Z9G7NSKCJD5VPJP3JM

Here is a real good solder sucker ___________________________________

http://www.amazon.com/dp/B00U1U4TTW?psc=1

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And here is a small soldering station that I use when it's hot in my shack. It's a real nice Variable Power 60 Watt Soldering Station with Removable Tip plus is ESD Safe. The tips are real cheap but last a long time.

http://www.amazon.com/gp/product/B00MCVCHJM?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00

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Hope this helps...
 

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I would stay away from soldering "pencils". They have no temperature control. Temperatures can reach 900 plus degrees when sitting, then cool down possibly below 500 degrees when doing heavier work.
They are always 'on', there is no cycling on/off. :down:
 

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I would stay away from soldering "pencils". They have no temperature control. Temperatures can reach 900 plus degrees when sitting, then cool down possibly below 500 degrees when doing heavier work.
They are always 'on', there is no cycling on/off. :down:
But the TiVo power supply is a simple single layer board, and replacing the caps is a simple soldering job.

Now if you're replacing the caps clustered around the CPU socket on a PC motherboard or moving SMD devices, that would be a different story.

I do recommend a minimum of 40 Watts for whatever you use on the TiVo PS, since you've got a big ground plane to fight.
 

· Grumpy Old Man
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Looks like my original Series 3 Tivo power supply is bad. Is it possible to use a power supply from the Tivo HD (TCD652160) in the series 3 Tivo (TCD648250) to confirm this assumption?
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Yes you can use the supply from a TCD652160 in a TCD648250B but DO NOT use the TCD648250B in a TCD652160 it has a gray line with is 7vdc and it will toast the mother board.
 

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Looks like my original Series 3 Tivo power supply is bad. Is it possible to use a power supply from the Tivo HD (TCD652160) in the series 3 Tivo (TCD648250) to confirm this assumption?
The 648 supply has an extra 7.5V section not used in the 652/658 supplies.

Otherwise the pin-out to the motherboard is the same.

So using a 652/658 supply in a 648 won't blow anything up or start a fire but I can't promise that for the other way around.

However, I tried a 652 supply in a 648 a while back, expecting it to work except for the OLED display and it did not, so it might not be as simple as "the 7.5V section is for the OLED display and only that".

The better way to test is with a Voltmeter set on the 20 or 25V DC scale.

Clip the black (negative) lead to the metal chassis (the case) on the side away from the power supply, or jam the tip in one of the holes on that side, and use the positive (red) lead to backprobe the plug that goes in the socket on the motherboard.

Yellow=12VDC, red=5V, orange=3.3V and gray=7.5V.

You won't get exactly those numbers, maybe 11.8 or 12.2 or 4.9 or 5.1, although generally the 3.3 will be almost exact.

But if it's more like 11.1 or 4.2, then that probably indicates failure.

Also, it you get very much variation in readings depending on whether the hard drive is connected or not, that indicates an inability for the supply to "voltage regulate", which is also a sign of failure.

It's a 648 supply. If the caps haven't failed yet, it's just a matter of time. Replace them and be done with it. Might as well do the 652 supply while you're at it as well.
 

· Grumpy Old Man
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Just tried that and it still doesn't melt what is on the circuit board. :confused: I'm not a soldering pro but this isn't my first time using one either... I don't get it.
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The solder on the board is a low lead solder. If you use some good solder it will help remove the old junk solder. Give that a shot.
 

· Grumpy Old Man
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Just tried that and it still doesn't melt what is on the circuit board. :confused: I'm not a soldering pro but this isn't my first time using one either... I don't get it.
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If so you have heat but yes check the tip to see if it's tight. If you can turn it with you fingers you need to use something to get it nice and tight. 40w should easily melt that junk solder I used a 28w pin once it took a long time but it worked. Are you using a solder sucker? If yes try to move the cap with heat on one leg it could be a clogged solder sucker.
 
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