Help sourcing PSU for Philips TV - Page 1
Forum section: electronics / repair

author: qc1998
author_rank: Contributor
timestamp: April 20, 2016, 09:44:12 pm
content: First, let me apologize for asking for help on my very first post...I have been following the EEVBlog for many years, and I occasionally read the forums.I guess it's just that I am not the social type. I almost never post anything on the Internet.Hell, I don't even have a FaceBook account...Now to business:I own an almost 8 years old Philips LCD TV.The TV still works, but a few month ago it started emitting strange sharp clicking sounds, just after being powered on.At the beginning, those clicking sounds used to stop after a couple of minutes.Over the last month, the clicking sounds began lasting longer and longer.It now takes about 10 minutes for them to stop.I traced the problem to a failing LCD backlight transformer on the main PSU board.The clicking sound seems to be high voltage discharge withing the transformer itself.There are no real external evidence of failure on the part itself, except for a small crack in the epoxy coating, but I am pretty sure that it is the transformer that failed.(There are no signs of arcing on the board, and I already replaced all the HV capacitors in the CCFL circuit. There are no other parts on the HV side.)Now, the problem is that I cannot find this PSU board or the transformer for sale anywhere.I am not a repair professional (I design Embedded stuff), so I am not sure where to go for TV parts. (I mean parts that DigiKey, Mouser, RS etc' don't carry)I've looked online, but no one seems to have this PSU in stock anymore, except a few websites in eastern Europe, but those are either not in English, or won't ship internationally.I also contacted the official Philips repair service here in Israel, but they claim that they do not have this part, and also that they won't sell me a PSU board anyway, unless I send the TV to them for (an overpriced) repair...Anyway, I am sure this forum has a few TV repair pros.If there is anyone who knows where I can get this PSU (or just the transformer), I would like to know.Also, if you come across a similar PSU, or one that has this transformer, I would gladly buy it from you.Any help would be appreciated.I know that the TV is 8 years old, and I should probably just replace it, but it seems so stupid to throw it in a landfill just because of a single failed part, that would take me 10 minutes to replace...This set was a rather high-end model at the time, and it's picture is still respectable even by today's standards, so I see no real value 'upgrading'.Call me old-fashioned, but I prefer to try and make it work for a few more years, if possible.Thanks.Technical Details:TV model: Philips 47PFL8404H/12PSU: DPS-298CP-2 (P/N 2722 171 00701, made by DELTA)Transformer Marking: MP-130B (02) / IH-DP8049

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: April 20, 2016, 10:10:06 pm
content: Found one that only ships from Germany within the EU.Exactly the same issue postedhttp://www.badcaps.net/forum/showthread.php?t=35814

author: qc1998
author_rank: Contributor
timestamp: April 21, 2016, 12:18:13 pm
content: RGB255_0_0,Thanks for looking into this.The problem does sound similar to the one discussed on badcaps.net, but that thread offers no relevant solution.Original poster (Hextinct) replaced the whole PSU, which I cannot source.Another person (mejohn) stated that after replacing the HV caps, the problem was "kinda fixed".As I said in my original post, I already replaced all the caps on the HV side, and the problem still exists.About that PSU you found in Germany, do you have a link?I do not live in the EU, but maybe I would be able to convince them to ship it to Israel...

author: Kjelt
author_rank: Super Contributor
timestamp: April 21, 2016, 12:25:39 pm
content: . already known with poster from first post, misread.

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: April 21, 2016, 12:37:32 pm
content: Quote from: qc1998 on April 21, 2016, 12:18:13 pmhttp://www.ebay.co.uk/itm/Reparatur-DPS-298CP-2A-Netzteil-fur-TV-Philips-47PFL7404-47PFL8404-47PFL5604-/252118582080?hash=item3ab3704340:g:dRwAAOSwFqJWtbt3You could always ask them.

author: qc1998
author_rank: Contributor
timestamp: April 21, 2016, 01:09:16 pm
content: RGB255_0_0,I don't speak German, but from what I can understand using Google Translate, they only offer a repair service. Not a PSU board.(You send them the PSU, and they attempt to repair it)I might try such a service as a last resort, but as the TV is still functional, I do not really want to take the PSU board out of it and send it to Europe.It would probably be a month or more before I get it back, unless I send it using UPS/DHL, which would cost more than this TV is worth...(All shipping methods other than regular post are ridiculously expensive over here, and customs charge you additional high fees)For now, I sent the seller a message asking if they would sell me just a backlight transformer.Who knows, maybe they would...

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: April 21, 2016, 01:21:29 pm
content: Sorry, not a German speaker either. Try askinghttp://www.ebay.co.uk/itm/Philips-47PFL7404H-12-Power-Supply-Board-PSU-DPS-298CP-2-2722-171-00701-Warranty-/331814939388?hash=item4d41b62afc:g:zmkAAOSwzvlW-B6~

author: qc1998
author_rank: Contributor
timestamp: April 21, 2016, 01:31:18 pm
content: I tried asking this seller about international shipping, but this seller apparently won't respond to messages.When I try to 'Contact Seller' on eBay, I just get this 'helpful' message:"We're sorry we couldn't find an answer for you. Unfortunately, this seller is unable to respond to your question. We suggest reviewing the item again to see if your answer is in the seller's listing."Not my day, I guess...

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: April 22, 2016, 03:53:12 am
content: its always worth checking for tv psu repair kits to find common problems.http://www.ebay.it/itm/Kit-Reparation-DPS-298-CP-2A-DPS-298-CP-4A-2-Diodes-SB260-SR260-3300-F-10V/252318745483

author: BMack
author_rank: Regular Contributor
timestamp: April 22, 2016, 05:51:37 am
content: I might have one at work(transformer), I'll save the pics and check our inventory and get back to you. Shipping might kill the deal though

author: qc1998
author_rank: Contributor
timestamp: April 22, 2016, 07:19:00 pm
content: Quote from: BMack on April 22, 2016, 05:51:37 amThanks!Let me know if you have the transformer, and if you do, what is the price for it.About shipping, you are located in the US, right?I know that US post is relatively expensive, but I had friends send me stuff from the US before.I checked USPS website, and sending a 'Priority Mail International® Small Flat Rate Box' to Israel is 33$.(Package is 8-5/8" x 5-3/8" x 1-5/8", maximum weight is 4 pounds. Enough for a transformer.)See:https://ircalc.usps.com/MailServices.aspx?country=10211&m=13&dpb=0&mdt=2016/04/22%2013:00&mt=13&dok=XX&dvi=15So, if the transformer itself is not too expensive, it might still be worthwhile for me to pay for shipping.

author: madires
author_rank: Super Contributor
timestamp: April 22, 2016, 07:33:32 pm
content: If you can't get a spare one you could buy a generic CCFL inverter via ebay, disable the original one and power the CCFLs with the generic inverter.

author: qc1998
author_rank: Contributor
timestamp: April 22, 2016, 08:06:15 pm
content: Quote from: madires on April 22, 2016, 07:33:32 pmYeah, I've though about it.I know those exist, but after looking around a bit, I doubt I can find one that fits this panel.Most LCD panels I've seen have several individual CCFL lamps, connected to several drivers.(On this size LCD, I've seen anything between 4 and 8 drivers...)This weird Philips TV, on the other hand, has only a single inverter / driver, with only 2 terminals.(See photos in my original post)As I assume a 47" panel must have more than one lamp, I suspect it has all the CCFL lamps connected in series.Another hint to this is that all the capacitors on the HV side are rated 6KV.On most drivers I've seen, the HV caps are 3KV at most.(I stand to be corrected on this speculation. I mostly design low voltage stuff, and have no experience with CCFLs...)I have yet to see asingle'generic' CCFL backlight driver board that can supply over 200W on it's own, and drive a 47" panel with just one lamp connection.(They mostly have 2-4 individual lamp connections, and for this screen size I think you are supposed to use more than one driver board)Feel free to correct me on this though.

author: BMack
author_rank: Regular Contributor
timestamp: April 23, 2016, 04:45:15 am
content: Quote from: qc1998 on April 22, 2016, 07:19:00 pmNone in stock, the one I had is just a little different. I'll have to check used boards if one might have it. Looking less likelybut for a pull I'd give it to you for just shipping. Sorry, I really thought that one we had would work.

author: Rasz
author_rank: Super Contributor
timestamp: April 23, 2016, 05:17:21 am
content: http://allegro.pl/dps-298cp-a-i6105389553.html= ~$33google translate should be enoughfluxcapacitor made a very good point, look at the "repair kit" for this psu and replace parts from that kitC709/731 area looks pretty toasty, and what do you know, same repair kit guy sells them specifically for this psuhttp://www.ebay.co.uk/itm/33pF-x-6000V-33J-6KV-Hochspannung-Keramik-Scheiben-Kondensator-fur-DPS-298CP-/252211234918of course price has a 'I know whats broken' tax attachedthey are $1http://mouser.com/Search/Refine.aspx?FS=TRUE&N=254340+4294646469+4267184481+1323043btw those caps are right next to transformer, and caps are known for piezoelectric effect, especially roasted tantalum onesbut assuming its popping because of isolation breakdownuh no, that would shut backlight off, you didnt mention it, but badcaps had a link to YT clip and backlight stays on = not transformerthose are actually two separate transformers, try swapping lamps around, or even running with only one plugged (no idea if there is a open circuit detection/safety cutoff)

author: Kleinstein
author_rank: Super Contributor
timestamp: April 23, 2016, 09:18:03 am
content: I had not perfectly working Phillips TV with supply problems too - I think I managed to fix the PSU problem (small output cap for standby power - so should have changed that in time), but something on the main part got damaged too.The funny part of that supply was it used the CCFL part also for doing the PFC. At least the backlight and main supply part where in series. So there may not be an option to run it with a separate driver for the backlight.I would also question if the defect is really the transformer. Usually transformers don't break down very often.

author: qc1998
author_rank: Contributor
timestamp: April 23, 2016, 02:22:11 pm
content: Look guys, I really appreciate you trying to help, but I want to ask you to:1. Please read what I wrote in my original post.People keep recommending that I replace the HV capacitors, which I said I already did.(The photos are BEFORE I did it, and yes, before you ask, the capacitors I used were new, ordered from RS.)People also keep suggesting fixes / repair kits for the LOW voltage side of the PSU.My problem is definitely on the HIGH voltage side.On the high voltage side, there are just a few capacitors, and the transformer secondary.2. Please give me SOME credit. I know I am not a TV repair professional, but I have been designing electronics for a living for over a decade...I know that a transformer fault is rare. Hell, if this problem was common, I would have fixed it by now...There is a crack in the transformer encapsulation, and the sounds are CLEARLY coming from the transformer!(I used a rolled-up paper tube to pinpoint the sound source)There is a slim chance that I might be wrong, but I doubt it.Also, one more thing I like to clarify about the HV circuit in this set:There are only 2 HV connectors. Each connector has 3 pins, but those pins are SHORTED together.(Think about it, there is not enough clearance between these 0.1" pitch pins for any high voltage...)Thank you.

author: Rasz
author_rank: Super Contributor
timestamp: April 24, 2016, 05:40:08 am
content: sorrygood news there are plenty of transformers you can fit there, bad news they are all mostly available second hand and usually listed around 30 $/euro80GL32T-38-TK TMS95304CThttps://translate.google.com/translate?hl=en&sl=ru&u=http://monitor.espec.ws/section48/topic220668.html&prev=search080GL52T929 TMS94876CTmaybe even 80GL52T931YS1http://www.servicetvcrende.it/shop/index.php?main_page=product_info&cPath=69_100&products_id=569this has onehttp://www.ebay.com/itm/power-supply-unit-philips-tv-47PFL4606H-/191853091823maybe 80GL32T923-TK TMS94949CThttp://parts-tv.com/en/Philips-XFMR-INVERTER-73MH-TMS94949CT-996510032995only 3 eurohttp://aukro.ua/080gl32t923-tms94949ct-i6134310628.html~$5parts-tv.com looks most decent from all of this, list price is only 3 euro and they supply shitho^^^less civilised parts of the world so shipping should be cheap too

author: qc1998
author_rank: Contributor
timestamp: April 24, 2016, 10:00:46 am
content: Quote from: Rasz on April 24, 2016, 05:40:08 amThat looks more promising!I appreciate that.May I ask how do you know that these transformers would fit my PSU?They look quite different.Do you have some cross-reference document or service manual?If you have any documentation, can I get a copy?Also, when you say that these would fit, do you mean that they woulddrop right into the board,or that theelectrical characteristicsare similar?Thanks.<RANT>By the way, I don't know where you live, but I am not sure I appreciate your 'less civilized' remark.I hope it was just an attempt at humor, but it does come across as pretty patronizing.I really don't want to go into politics, but you might want to take a look at:https://en.wikipedia.org/wiki/List_of_countries_by_Human_Development_Index#Very_high_human_developmentorhttps://en.wikipedia.org/wiki/List_of_countries_by_GDP_%28nominal%29_per_capita#List_of_per_capita_nominal_GDP_for_countries_and_dependenciesI would admit that the customs and tax offices over here are pretty uncivilized though...</RANT>

author: Rasz
author_rank: Super Contributor
timestamp: April 24, 2016, 03:10:58 pm
content: Quote from: qc1998 on April 24, 2016, 10:00:46 amfirst link from last post, some russian tested TMS95304CT, other ones might have different footprints, but they all look quite standardized across philips TVsQuote from: qc1998 on April 24, 2016, 10:00:46 amquite simple really, I linked fully working and tested supply for $30 and you didnt buy it, so I figured you are looking for some kind of ridiculously cheap deal, company supplying parts to latin america might just be the ticket, nothing to do with your geo location

author: qc1998
author_rank: Contributor
timestamp: April 24, 2016, 03:47:48 pm
content: Quote from: Rasz on April 24, 2016, 03:10:58 pmAre you talking about that auction site that iscompletely in Polish?(http://allegro.pl/dps-298cp-a-i6105389553.html)The price was never the issue. I would gladly pay 33$ for that PSU!(Even double that TBH)The problem is that I don't speak a word of Polish, and using Google translate, I was not able to order the item.I actually did spent about half an hour trying to understand how the site works, but got nowhere...(Trying to add to the shopping cart, I just get an error saying ": CART_SOMETHING_WRONG")I also found no mention of International Shipping on that site/item.Anyway I doubt that a site without an English UI option would even ship outside Poland.Do you speak Polish BTW?QuoteI'm not sure I understood what the Russian guy was trying to do, and his results.Google translate of that site looks like gibberish to me.About the other ones, are you saying that the fact that a transformer 'look quite standardized' should be enough to try and use it?I would seriously hesitate going by this assumption, without an actual datasheet or documentation.I do not want to risk blowing up the panel with the wrong voltage or current rated transformer.Maybe I would try it as a last resort, if I can't find the actual part.Do you have any additional evidence that these transformers are at least electrically similar?Thanks.

author: baku
author_rank: Newbie
timestamp: April 15, 2017, 11:11:55 pm
content: Quote from: qc1998 on April 24, 2016, 03:47:48 pmHello All,I have been looking for the solution of the same issue I have with my 42PFL8404H/12 Philips LCD and found this 1 year old post.Was any fix found for the issue ?Dearqc1998, please update.

author: qc1998
author_rank: Contributor
timestamp: April 15, 2017, 11:37:35 pm
content: Quote from: baku on April 15, 2017, 11:11:55 pmUnfortunately, I haven't been able to solve the problem.As I said before, I am pretty sure that the only way to repair the power supply is to replace the high voltage transformer, but I was not able to find a replacement part.(Or a replacement PSU board)I recently got a power supply from a different Philips TV that I think has an electrically similar backlight, but the transformer in it has different footprint / physical dimensions.(My TV's original power supply was made by Delta, while the other power supply I got was made by LG)When my TV finally dies I might attempt to replace the transformer with the one from that different model.It would be an improvised, ugly fix, and I am not sure if it would work, but it's probably worth a shot.And by the way, yes, the TV still works, probably because it is not being used much.(I have another TV and two tablets...)You just have to wait for a few minutes after you turn it on for the discharge 'clicks' to stop.AndBaku, if you do find where to buy this transformer (or the whole power supply board), please let me know.Thanks.

author: baku
author_rank: Newbie
timestamp: April 16, 2017, 01:13:13 am
content: Quote from: qc1998 on April 15, 2017, 11:37:35 pmI was hoping for a better luck on your sideI have found a slightly different revisions of the same PSU board on ebay.Take a look :http://www.ebay.com/itm/Philips-2722-171-00702-Genuine-DPS-298CP-A-Power-supply-Board-New-in-Box-/381988285104?_trksid=p2141725.m3641.l6368http://www.ebay.de/itm/Netzteil-DPS298CP-1A-aus-Philips-37PFL8404H-12-/182527130619?_trksid=p2141725.m3641.l6368http://www.ebay.de/itm/Netzteil-DPS-298CP-A-fuer-LCD-TV-PHILIPS-37PFL8404-H-12-37PFL8684-H-GEPRUFT-/252776900985?_trksid=p2141725.m3641.l6368You have mentioned that you have replaced the ceramic capacitors and it did not help.Were you talking about the capacitors I marked on the picture ?Are they the same capacitors offered here :http://www.electronic-doc.de/kondensatoren/420-reparaturset-dps298cp4a-2x33pf-2x47pf.html?search_query=DPS-298CP&results=21

author: james_s
author_rank: Super Contributor
timestamp: April 16, 2017, 05:13:48 pm
content: You might try whatever similarly sized CCFL transformer you can find, the specs tend to be very similar even if they don't look quite the same. There are lots of ccfl transformers on ebay, or you could set up a saved search for your TV model that will alert you if any parts for it get listed. Often you can buy boards from scrapped TVs.

author: qc1998
author_rank: Contributor
timestamp: April 16, 2017, 08:50:34 pm
content: Quote from: baku on April 16, 2017, 01:13:13 amI am not sure about these boards you found.This revision (DPS-298CP-A) seems to be from the 37" TV. Mine (DPS-298CP-2) is a 47".I'm pretty sure that the power requirements for a 47" are much higher than for a 37", so the revision difference is probably a difference in power rating.(And for ~100EUR before shipping I am not willing to take the risk...)Another issue is that those eBay listings don't seem to have shipping options for Israel...(And from my experience with eBay, even if they would agree ship them here, the price would probably be too high)Again, I might try to get one of those different revision boards as a last resort, if/when my TV stops working completely...(Or when I find one for under 50$)Quote from: baku on April 16, 2017, 01:13:13 amYes, those look like the capacitors I replaced.(Though I got mine from RS Components)And as I said before, it didn't change anything...Quote from: james_s on April 16, 2017, 05:13:48 pmYour suggestion to look for a backlight transformer from another model would make sense, but there is a 'slight' issue:I'm not an expert on TV design, but I think these Philips panels have a different backlight design than most 'typical' LCD TV's.On most TV's I've seen there are quite a few (4-10?) small transformers, each driving one CCFL lamp.On these Philips panels, there is a single large transformer which drives all the CCFL lamps. (Which are probably connected in series)Anyway, as I wrote before, I was able to get a PSU from a different Philips TV that seems to have electrically similar design, but the footprint for the transformer is not the same.I might try to 'bodge' it onto the board when my transformer dies completely.As for using the search function on eBay, I have already set up an alert for this PSU board over a year ago, but nothing comes up.I guess this TV was not that popular (which makes sense considering how expensive it was at the time) or that they might all share the same failure mode, making getting a working PSU pretty hard...Anyway, thanks.

author: james_s
author_rank: Super Contributor
timestamp: April 17, 2017, 06:31:21 am
content: I don't remember what brand it was, but I once scrapped a TV that had a smashed panel, it had electrodeless CCFL tubes that were all wired in parallel and RF driven. I think it was a Vizeo but I wouldn't swear to it.