Proscan 55LC55S240v69

[DBacksFan5205]

Re: Proscan 55LC55S240v69

Update: Yes, it WAS a silly question! I have since found photos of the internals of the 55” Proscan posted by other owners and I see no cable/harness between the points I was asking about. So, I did get that question answered.

The latest news on my Proscan: It is now up and running fine. It had not previously stayed on any longer than 10 minutes before going into the shutdown/cycling/screen flashing mode. I have run it for over 8 hours now without a single hiccup.

Thank you gsmy and budm for pointing me to capacitor C857. Very close inspection of C857 showed that it had some slight discoloration on one end and that the blue coating had split slightly. Don't know what the ESR should be for this cap, but mine measured 38, both in-circuit and stand-alone.

I couldn't find the exact capacitor from my favorite local parts supplier, so I took an equivalent metalized polypropylene film capacitor out of a PSA from a Samsung with a broken display that I had around. The part was marked:
PILKOR MMKP WK 10 25, 68n 1000V.
This cap has an ESR of 18. Installed it in the Proscan and voilà! Like I said, the Proscan has been working fine for many hours so far.

Thanks again everyone who has contributed to this Forum!

[panrock99]

Re: Proscan 55LC55S240v69

The original cap in my board is a CBB81 68nJ 1000v. I replaced it with this one.

http://search.digikey.com/us/en/prod...1922-ND/502702

The borrowed board that appears to have been rebuilt has the CBB81 22nJ 2000v. Any explanation why it would be a different value?

Had the exact same issue as described with my 55'' Proscan. C857 capacitor from the power board had no sign of defect, but lacking the tools needed to measure ESR, I went ahead and ordered the capacitor from above link. The set powered on without a hitch. I attached a photo of the board after replacing the Cap.

Thanks for the info.

[tom66]

Re: Proscan 55LC55S240v69

With poly-type capacitors, the failure mode is decreasing capacitance, rather than increasing ESR. I have pulled a failed poly cap from Yamaha sound amp, which prevented it from powering up. Once replaced -- £20 for a 6.1 channel system !

[budm]

Re: Proscan 55LC55S240v69

Thanks for posting the result.
When they failed badly, it looks like this:
http://s807.photobucket.com/albums/y...nt=badcap1.jpg

http://s807.photobucket.com/albums/y...t=DSCF1714.jpg

http://s807.photobucket.com/albums/y...t=DSCF1702.jpg

[dpiroli3]

Re: Proscan 55LC55S240v69

Worked on two of these sets recently, the first set capacitor C857 was bad, and the second set V801 was shorted and F801 was blown. Just thought id share my experience with this tv.

[toeonly]

Re: Proscan 55LC55S240v69

I got one of these on craigslist for a song because it would not power up. I changed the cap at C857 plugged it in and pow I now have a great 55 inch TV. Thank you to every one in this thread for pointing me the way. :-)

[Jim krikit]

Re: Proscan 55LC55S240v69

Just got one of these proscan 55s that was headed for the dumpster. It turns on then screen flashes and then turns off. Did some troubleshooting on Internet and found this thread. I don't have any real electronics background, but all caps appear ok on Power supply board. The blue C587 looks like it may have some discoloration at one end, but don't see any splitting. I ordered the recomended replacement from the link above. I Hope it works! This will be a great deal for $1.99 plus shipping :-]

Thanks for all the great information
I'll post if it does the trick or not

[martyparish]

Re: Proscan 55LC55S240v69

Hey Jim,

I just got one of these and fixed it as well! Beware though, the c857 did not fix my set! (even though it showed obvious discoloration!!!)

I ended up replacing all electrolytic caps on the power board and THEN it was fine!!! (still only cost around $15 w/ shipping)

Here's the link to my thread for reference: https://www.badcaps.net/forum/showthread.php?t=25679

[Jim krikit]

Re: Proscan 55LC55S240v69

Just put in new cap for C857 and it turned on fine. Didn't have cable hooked it was just saying no signal and the turned itself off after 10 min or so. Hope that was normal when there is no signal
Got it hooked up now and picture looks great. Hope it stays on. Been 15 or 20 min so far.
Thanks for all the info. Made it real easy. Cap was a $1.99 and girfriend bought me the soldering iron for valentines day :-]


Thanks again!

[christo499]

Re: Proscan 55LC55S240v69

I have the same TV and am trying to repair it . Eveything on the psu looks good visually but there is a high frequency buzz coming from near vd812 . The numbers on this part are sp933 and b2545g . I will be watching this thread for response . I am also considering using the panel to repair any of the other models where it is applicable . The panel is LC550WUD SBM1 .

[cequil32]

Re: Proscan 55LC55S240v69

I am working on this tv and wonder if I have the same problem. When I plug the tv in the power supply just keeps turning on and off every second...click, click, click, click, etc... until I unplug it. Same thing if the inverter boards are disconnected. Was wondering I guess if it was just capacitors or something else.

[RamonetB]

Re: Proscan 55LC55S240v69



Thanks to all of you for helping me fix my TV!

I have the 47" version of this TV (47LC55S240V87) using the same power supply (RSG7.820.1357). In the middle of watching TV, the system turned off and the internal relay began clicking three times before shutting the system off in protection. Power buttons on TV and remote refused to bring it back up. The only way I could get it to try again was to unplug it and plug it back in.

Like many others here, it was the C857 capacitor. The one end had bulged, was slightly discolored, and once removed from the system, was only reading 15 uF.

I bought the part from Digi-Key as listed above and now have a fully functional TV again! Just wanted to drop my experience for future readers. The more success stories, the better!

-Kirk

[Mik Black]

Re: Proscan 55LC55S240v69

What is the Digi part number so I can order one

-Mik

[Mik Black]

Re: Proscan 55LC55S240v69

I need the Digi part number for C857