Bad Caps in Monitor? - Page 1
Forum section: electronics / general

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 02:24:49 am
content: Anyone have any experience replacing bad caps in monitors/tvs? My HP ZR2740W is acting up as of last night for the second time and HP doesn't want to replace it again. It will go black and come back on every so often (tested to make sure it wasn't graphics card).Thanks guys.

author: Dark Prognosis
author_rank: Regular Contributor
timestamp: May 31, 2012, 02:58:57 am
content: My Samsung 215TW is notorious for bad caps and they are the same ones too. Opened mine up and almost all of them had vented so were bulging.Look to your electrolytic caps for buldging/venting, etc... as they are normally the ones that go bad cause the bastard LCD companies charge 600 dollars (like mine) then fill them with One Hung Lo pieces of crap.

author: DrGeoff
author_rank: Frequent Contributor
timestamp: May 31, 2012, 03:06:14 am
content: Samsung are notorious for this problem, in both LCD TV's and monitors.http://www.axtsystems.com/index.php?option=com_content&view=article&id=83:samsung931bfix&catid=48:fixingstuff&Itemid=81

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 03:11:02 am
content: Makes me angry this monitor was slightly less than $800 when I bought it. I'll have a look tomorrow and see what I can do.

author: mariush
author_rank: Super Contributor
timestamp: May 31, 2012, 03:16:17 am
content: If you don't see something obvious, register on the badcaps.net forums and post pictures in the "Monitors" section and people there will try to help you.I personally fixed several monitors, mostly with bad caps or old cfl lamps..

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 03:19:16 am
content: It is an LED backlit IPS Monitor and the backlight seems to be functioning so it is likely the caps. Thanks for the heads up about the website.

author: Mint.
author_rank: Frequent Contributor
timestamp: May 31, 2012, 03:33:04 am
content: I have the same problem. I am not sure whenever I should open up the monitor and replace the caps...

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 03:39:24 am
content: Same monitor or different monitor same problem?

author: Mint.
author_rank: Frequent Contributor
timestamp: May 31, 2012, 03:56:19 am
content: Samsung monitor and similar problem. The monitor usually makes a low volume high pitched sound when on and sometimes gives me a black screen.

author: DrGeoff
author_rank: Frequent Contributor
timestamp: May 31, 2012, 04:02:53 am
content: Sounds just like bad caps. I think they buy their PSU modules from Wun-Hung, and there is definitely a quality problem. I have often found 10V electros on 12V rails in these modules.

author: Mint.
author_rank: Frequent Contributor
timestamp: May 31, 2012, 04:07:52 am
content: Quote from: DrGeoff on May 31, 2012, 04:02:53 amWhat is ironic is the fact that those monitors usually cost over $300!

author: DrGeoff
author_rank: Frequent Contributor
timestamp: May 31, 2012, 04:14:41 am
content: You can get them cheaper than that! After the caps blow, the punters usually chuck them out! Then it's a $5 fix and you have a good working monitor (or TV).

author: T4P
author_rank: Super Contributor
timestamp: May 31, 2012, 04:14:57 pm
content: Quote from: Dark Prognosis on May 31, 2012, 02:58:57 am... Samsung is basically One Hung Low... Everything from them is from china now, anyways, most koreans are exactly that, communists.I have lots of rant but i cannot complain about the good old days of samsung (my screen is still good after about 4-5 years)

author: tom66
author_rank: Super Contributor
timestamp: May 31, 2012, 04:25:14 pm
content: Quote from: DaveXRQ on May 31, 2012, 04:14:57 pmAgreed - Samsung TVs are designed fairly well, but they skimp on parts. I've repaired more Samsung TVs than any other brand (five in total.) Newer Samsung TVs are using crap CMO and Chungwha LCD panels which develop dark spots after a year or so and make LCDs look bad for motion performance. (People complain LCDs blur a lot, but only the cheap ones - Samsung and LG Philips/LG Display panels seem pretty good to me.)

author: SeanB
author_rank: Super Contributor
timestamp: May 31, 2012, 04:34:18 pm
content: Samsung monitors were very good, never had one fail in the warranty period, but all would die a spectacular death from LOPT failure after the warranty period was up ( 5 years on the LOPT and tube) but even those driven 24/7 for 5 years had good tubes up to the tip. The caps would be bulging, brown and dying, but the design still ran, but the transformers were not available.Don't know about newer stuff, touching wood about my monitor...........

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 05:16:58 pm
content: I have 4 samsung LCD's and they all work brilliantly one of them is like 5-6 years old. Same with the Dell monitors I own. However the 2 HP monitors I have had fail constantly.

author: AlphZeta
author_rank: Regular Contributor
timestamp: May 31, 2012, 05:41:41 pm
content: I just fixed an LCD of similar problems for a co-worker a few months ago. The monitor would not come on and after opening in up, it appeared that one of the cap in the switching power supply went bad (has white residue on it). After I replaced the cap, everything worked again.

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 05:55:36 pm
content: I'm doing that today. I'll let you guys know.

author: SeanB
author_rank: Super Contributor
timestamp: May 31, 2012, 06:21:12 pm
content: That is why i have a container with assorted SMPS capacitor replacements in it. A few 47/400V units, a few 1000/25V units, some 470/25V and a few 100/16v units at last look. Pretty much covers most values more or less in all I encounter. Generally you can replace with whatever is a higher voltage and where the capacitance is close ( within 30% or so) and which will fit in the allocated space on the PCB.

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 07:05:46 pm
content: I posted a video of the problemhttp://youtu.be/JsVdwXGSOjk. Looks like it is caps to me, but I want to get a second opinion. I found someone willing at HP to consider giving me a replacement, but the last time they replaced it I had to go through 4 crappy monitors that were obviously cosmetically damaged before I got a good one (Pic of one:http://zopsi.com/broken.jpg). Needless to say I would rather repair it myself if it is the caps than go through that crap.

author: Mashpriborintorg
author_rank: Regular Contributor
timestamp: May 31, 2012, 07:12:07 pm
content: I've found a 21 inch Samsung TFT monitor abandonned in the street last week. Nice body condition, but would not power up. 20 minutes of work and 3 capacitors later, it was installed and working onto my desk. I did only replace the worst looking capacitors, with what I had in stock, it seems to be enough for now. If it fails again, I'll just have to replace all the remaining original caps. Not a bad deal.

author: T4P
author_rank: Super Contributor
timestamp: May 31, 2012, 07:12:54 pm
content: Quote from: SeanB on May 31, 2012, 06:21:12 pmAh. Nice, added these caps to my order

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 07:15:25 pm
content: Anyone take a look at that video?

author: SeanB
author_rank: Super Contributor
timestamp: May 31, 2012, 07:24:09 pm
content: Dave, just make sure they are 105C low ESR units, with a high ripple current rating, preferably with a spec that includes a ESR at 10kHz and 100kHz. Best to get a few footprints as well, you will need them in various lead spacings to suit various boards. Best to include a few 2200/16 units as well, and some 2200/10 units. Do not bother with any 6.3V units as they are pretty much the same size as 10V units.

author: FenderBender
author_rank: Super Contributor
timestamp: May 31, 2012, 08:05:18 pm
content: Hmm as far as I remember, Samsung was one of the best, if not THE best manufacturer of monitors and LCD panels. I think their technology is still good, just shitty quality control and poor component selection. For monitors, you really need to use good quality components, since the temperatures they are subjected to. 105*C caps are a must and of a good manufacturer. Otherwise you are just asking for trouble.

author: Dark Prognosis
author_rank: Regular Contributor
timestamp: May 31, 2012, 08:13:51 pm
content: Quote from: Zopsi on May 31, 2012, 05:16:58 pmThen your time is short as Samsung is notorious for saving 5 dollars via the One Hung Lo shit brand of capacitors. If they would get rid of the cheap Chinese shit and stick a Japanese built one in their places I would go back to Samsung.

author: Excavatoree
author_rank: Frequent Contributor
timestamp: May 31, 2012, 08:18:45 pm
content: Quote from: SeanB on May 31, 2012, 07:24:09 pmI remember it wasn't a trivial task to get capacitors that fit in the space of the old cap, had at least as high of a voltage rating, had equal or better ripple current rating than the specifications of the bad capacitors, and had the longest life expectancy.Of course, the monitors with supplies I fixed just by blindly choosing capacitors with long life are still working - when they fail I'll just replace.I know it's an old monitor, but if anyone needs a list of all caps to replace in a ViewSonic VGS2230 complete with Digikey Part numbers, let me know. (both power supply versions) They threw out several at work, I managed to fix all of them.Strangely, the View Sonic branded monitors (made by ChiMei) had the bad capacitors, while the ChiMei branded monitor I bought had better capacitors. Of course, the LCD panel went bad on that one. Go figure.

author: mariush
author_rank: Super Contributor
timestamp: May 31, 2012, 08:41:03 pm
content: Quote from: Dark Prognosis on May 31, 2012, 08:13:51 pmActually Samsung are patriotic and only almost only South Korean capacitors in their monitors... Samwha and Samyoung (though if I remember correctly, Samyoung actually just outsourced the production of some series to GSC which is bottom of the barrel manufacturer). In their laser printers I see some Lelon capacitors.

author: Zopsi
author_rank: Contributor
timestamp: May 31, 2012, 08:53:32 pm
content: Everyone has something to say about samsung. I like my samsung monitors. Did anyone have a look at that video? I would like to know if anyone thinks that issue is capacitor related so I can order parts and fix it before the weekend (sorry to be pushy).

author: tom66
author_rank: Super Contributor
timestamp: May 31, 2012, 09:14:43 pm
content: Quote from: mariush on May 31, 2012, 08:41:03 pmI've seen quite a few Capxon, Samxon and JH caps in Samsungs. The Samxon seem okay, but the Capxon and JH are rubbish.

author: Dark Prognosis
author_rank: Regular Contributor
timestamp: May 31, 2012, 09:28:37 pm
content: Quote from: Zopsi on May 31, 2012, 08:53:32 pmI loved my Samsung monitor too until I uncovered the dirty secrets of what they do. Still love the quality of the LCD from them but having craptastic caps is just not acceptable.

author: Dark Prognosis
author_rank: Regular Contributor
timestamp: May 31, 2012, 09:33:28 pm
content: Quote from: mariush on May 31, 2012, 08:41:03 pmYes, those are in there but they are not the ones that fail they are normally the brand known as Capxon which, from what I read, are from China. Capxon is of the lowest grade caps YET Samsung uses them (along with the others you mentioned that aren't the problem normally).

author: Monkeh
author_rank: Super Contributor
timestamp: May 31, 2012, 09:42:44 pm
content: At least they're not cheapo Teapos.

author: tom66
author_rank: Super Contributor
timestamp: May 31, 2012, 09:48:13 pm
content: Quote from: Monkeh on May 31, 2012, 09:42:44 pmTeapo are bad, but not as bad as Capxon... half of my bad cap pulls are Capxons.

author: Monkeh
author_rank: Super Contributor
timestamp: May 31, 2012, 09:51:49 pm
content: Quote from: tom66 on May 31, 2012, 09:48:13 pmOn the flip side, I've only had two or three bad Capxon caps, and dozens of Teapos in all sorts of devices.And the name.

author: tom66
author_rank: Super Contributor
timestamp: May 31, 2012, 10:00:54 pm
content: Quote from: Monkeh on May 31, 2012, 09:51:49 pmI'll regard both as crap - recently pulled 6 Teapos from a computer PSU.

author: SeanB
author_rank: Super Contributor
timestamp: June 01, 2012, 05:04:12 am
content: I won't say about the other equipment Samsung makes.......

author: Dark Prognosis
author_rank: Regular Contributor
timestamp: June 01, 2012, 06:58:21 am
content: Quote from: SeanB on June 01, 2012, 05:04:12 amHeheheh.What got me was this so-called national pride of Samsung and that made me laugh. Business has no national borders and their god is the almighty currency. If Samsung had this "national pride" bullshit you wouldn't find any Chinese crap caps intermixed with South Korean made ones.Some people need to pull their heads out of their collective nationalistic butts and realize that corporations don't give one damn about anything but profit.

author: gregariz
author_rank: Frequent Contributor
timestamp: June 01, 2012, 07:16:58 am
content: I also recently replaced these little timebombs from a monitor supply.Since this has been going on for so long I find it difficult to believe that everyone is not aware of the problem or the fix. I suspect their use is now intentional and more like planned obsolesense rather than anything else. A convenient scapegoat that is now not the manufacturers fault

author: T4P
author_rank: Super Contributor
timestamp: June 01, 2012, 07:45:18 am
content: Quote from: SeanB on May 31, 2012, 07:24:09 pmI'm looking at rubycon, which ones will you recommend ?

author: Dark Prognosis
author_rank: Regular Contributor
timestamp: June 01, 2012, 09:40:09 am
content: Quote from: gregariz on June 01, 2012, 07:16:58 amI agree and the reason I agree is that after much research, and my own personal experience, the caps die shortly after the warranty runs out. Coincidence that so many happen like that? I think not.As far as low ESR ratings go I was directly told that doesn't matter in the case of the caps that always fail in the 215tw (or similiar monitors) but people will religiously follow their dogma I was told as well.

author: tom66
author_rank: Super Contributor
timestamp: June 01, 2012, 09:44:53 am
content: Sony and Panasonic seem to exclusively use Japcaps, which have proven reliability.I had an Orion CRT TV (just a 14" Argos special) which used Rubycons and one Panasonic cap.I also agree, it's deliberate on the part of the manufacturer. It's not a coincidence that the R87 series of Samsung TVs died at 13-14 months old. I think they were testing the water. Now it's closer to 18 months but that is pathetic.

author: mariush
author_rank: Super Contributor
timestamp: June 01, 2012, 12:09:40 pm
content: Quote from: DaveXRQ on June 01, 2012, 07:45:18 amRubycon ZLH, ZLJ, ZLKPanasonic FM or FR are also very good choices.

author: T4P
author_rank: Super Contributor
timestamp: June 01, 2012, 02:52:55 pm
content: Quote from: mariush on June 01, 2012, 12:09:40 pmThanks maurish ...