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Old 09-08-2009, 08:15 PM   #1
bluto
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Default Samsung DTB-H260F HDTV Tuner

I have a Samsung DTB-H260F HDTV Tuner that is not working. When the power button is pressed the blue power light comes on for 1/4 of a second and then goes off. Cracked the case open and found one bulged Samxon 1000uf 10v cap on the power supply board. Replacements for all the electrolytic caps on the psu board are on the way from digikey. Will update on the status of the patient once they come in. See attached image for the problem cap.
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Old 09-09-2009, 03:30 AM   #2
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Default Re: Samsung DTB-H260F HDTV Tuner

If replacing this capacitor makes the set-top box work again, replace all of the capacitors on the secondary side of the power supply board with Nippon Chemi-Con KY Series.
Are we still losing faith in Samxon?
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Old 09-09-2009, 07:00 AM   #3
Wizard
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Default Re: Samsung DTB-H260F HDTV Tuner

That poor samxon was overheated in that hot spot. Not the Samxon issue.

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Old 09-09-2009, 07:50 PM   #4
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Default Re: Samsung DTB-H260F HDTV Tuner

Nope it's not about heat that's Samxon GF series the series is pure crap they bulge regularly in hot LCD inverters. This is the Nichicon HM series of Samxon the one where they dropped the ball.

Just get a decent series from any of the top companies like Panasonic FCs for example and you'll be fine. Replace any other GFs you find too.

Better yet just replace all the secondary caps to start on a clean slate.

I see you already order from Digikey as long as the caps are low ESR then you'll be fine.

My Cablecard set top box PSU is full of Samxons too. I peep in through the vent holes regularly and see no hunter green Samxons (GF series) or bulging whatsoever so I'm exempt from the GF plague .

This is why I still don't trust Samxon to the same extent I trust Panasonic, UCC, and Nichicon. They in my opinion are still new kids on the block.
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Last edited by Krankshaft; 09-09-2009 at 07:59 PM..
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Old 09-09-2009, 08:53 PM   #5
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Default Re: Samsung DTB-H260F HDTV Tuner

Samxon; I use GC and GD in these. If need long-life, use GT. GF is not very tolerant of heat and switching compared to GC/GD.

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Old 09-10-2009, 06:12 PM   #6
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Default Re: Samsung DTB-H260F HDTV Tuner

Good news, the patient lives! Replaced the 1000uf and 470uf caps with new Panasonic FC caps and the filter cap with a Panasonic TS-ED series cap. The other three were replaced with some Panasonic NHG caps that i had lying around. Plugged everything in and it came right up. Another $200 device saved from a 10 cent cap!

Thanks for the replies and thanks to TC for this great resource!
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Old 09-10-2009, 09:20 PM   #7
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Default Re: Samsung DTB-H260F HDTV Tuner

Nice job!

Pana FCs are used to being baked they have a non-aqueous electrolyte they're troppers in hot PSUs.

Last edited by Krankshaft; 09-10-2009 at 09:22 PM..
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Old 11-14-2009, 12:29 AM   #8
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Default Re: Samsung DTB-H260F HDTV Tuner

.
Troopers
.

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Old 11-27-2009, 11:03 PM   #9
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Default Re: Samsung DTB-H260F HDTV Tuner

Quote:
Originally Posted by bluto
Good news, the patient lives! Replaced the 1000uf and 470uf caps with new Panasonic FC caps and the filter cap with a Panasonic TS-ED series cap. The other three were replaced with some Panasonic NHG caps that i had lying around. Plugged everything in and it came right up. Another $200 device saved from a 10 cent cap!

Thanks for the replies and thanks to TC for this great resource!
Beware, the Panasonic NHG is general purpose, not low ESR. GP caps are not ideal devices for filtering a switching power supply output. They might not last very long in that application.
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Old 12-13-2009, 06:50 PM   #10
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Default Re: Samsung DTB-H260F HDTV Tuner

Thanks for the tips. My tuner just died and the same exact cap bubbled. I replaced it with a Panny 1000u FC cap and it's working again. Fantastic!
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Old 10-06-2010, 09:28 AM   #11
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Default Re: Samsung DTB-H260F HDTV Tuner

I had four of these units all with same problem - no power. Did just what you said and it fixed all 4.
Replaced the two 1000uFd and the two 470 uFd caps on secondary side.

Thanks
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Old 10-19-2010, 03:00 PM   #12
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Default Re: Samsung DTB-H260F HDTV Tuner

guys, this thread is money! replacing the same cap worked for me. I also saw the bulge but just needed more confirmation!

I've posted a link to this thread on samsung 260f avsforum thread to help other people out. Just fyi, I called in samsung and they gave me 90 bucks, even though it was out of the warranty period! Used 20 bucks for the replacement caps and soldering iron kit and the rest will go to further my other bad habits

Thanks!
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Old 09-13-2009, 08:38 PM   #13
bluto
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Default Re: Samsung DTB-H260F HDTV Tuner

Kinda wish the manufacturers would give you the option to pay $5 more and get the good caps right from the start
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Old 10-17-2009, 06:47 AM   #14
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Default Re: Samsung DTB-H260F HDTV Tuner

Thanks for your help. I'm an electronics novice but I do know how to use a soldering iron. With your information I was able to save my only high-def source by replacing the failure-prone 1000uf capacitor.
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Old 11-13-2009, 10:55 PM   #15
bluto
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Default Re: Samsung DTB-H260F HDTV Tuner

Glad to see that my post is helping others fix their tuner. To make it easier to order new capacitors, here are the digikey part numbers for all the caps on the power supply.

All are Panasonic FC except the filter cap.

P10224-ND 1000UF 10V (qty 2) replace these two caps at the minimum
P10221-ND 470UF 10V (qty 2)
P11258-ND 330UF 50v (qty 1)
P10320-ND 33UF 50v (qty 1)
P10312-ND 1UF 50v (qty 1) polarity not marked on board, note before removing
P11695-ND 82UF 450V (qty 1) the large filter cap, replace this while you are at it

total cost should be no more than $15 with shipping
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Old 04-28-2014, 04:37 PM   #16
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Default Re: Samsung DTB-H260F HDTV Tuner

I had the same problem with my H260F, but I couldn't see any bulged caps. I went ahead and replaced them all hoping that would solve the problem. Now it acts a bit different. Before replacement, the LED would come on for ~1 sec. Now it stays on for 15 seconds or so, and then goes out. I checked the voltages on the power supply and they seem to be OK, but the 14V line starts to fluctuate just before the LED goes out.

I also discovered that if I press the 'SW1' switch on the other circuit board (the green one) while the power is on, it will stay on - but only if I press the switch every few seconds.

Any idea what I should look at next?

Lowell
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Old 11-14-2009, 01:13 PM   #17
MJA28
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Default Re: Samsung DTB-H260F HDTV Tuner

if this works with my tuner you guys will save me $250.i have the same tuner with the same issue(blue light just last 10sec)
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Old 11-14-2009, 10:00 PM   #18
bluto
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Default Re: Samsung DTB-H260F HDTV Tuner

Glad to help. I am sure you won't be the last!
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Old 11-15-2009, 07:08 AM   #19
MJA28
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Default Re: Samsung DTB-H260F HDTV Tuner

by the way. I thought bad caps look like a popcorn shape foam on top of the cap .lol
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Old 11-15-2009, 06:02 PM   #20
Wizard
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Default Re: Samsung DTB-H260F HDTV Tuner

Fortune timing, I have a question how are these DTB-H260F tuner box fares on SD channels upconverted to 1080 in terms of picture quality? Better than built in scaler of TVs?

If one don't know, this is rare few models from some few makers that have NTSC and ATSC tuner with HDMI output

Cheers, Wizard

Last edited by Wizard; 11-15-2009 at 06:05 PM..
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