Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
Announcement
Collapse
No announcement yet.
Samsung UN32F5500 with bad LEDs
Collapse
X
-
Samsung UN32F5500 with bad LEDs
Got this one in today, the LED strings are connected in series, one had open LED, one has shorted LED. I bypassed them using 5 1N4007 in series to simulate LED, both LEDs are removed and replaced with 5-DIODE string.Last edited by budm; 05-16-2015, 08:40 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Tags: None
-
Re: Samsung UN32F5500 with bad LEDs
I could not find them, I put them away some where.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
-
Re: Samsung UN32F5500 with bad LEDs
Sigh, another Samsung with bad LEDs problem. Serious design flaw here.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
Comment
-
Re: Samsung UN32F5500 with bad LEDs
I have to wonder, when two LEDs are already failed, is this really a fix. It seems like more will likely fail soon.
I see problems like this all the time due to cheap LEDs. If LEDs are designed and manufactured well, they last a very long time. But so many of them aren't -- there's a huge problem with fakes, too -- that we see early failures. I've seen LEDs fail intermittently, causing pulsing light sources (like a worn out fluro), I've seen colour mismatch after just hundreds of hours, I've seen package/bond failures, etc...Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
Comment
-
Re: Samsung UN32F5500 with bad LEDs
Originally posted by tom66 View PostI have to wonder, when two LEDs are already failed, is this really a fix. It seems like more will likely fail soon.
I see problems like this all the time due to cheap LEDs. If LEDs are designed and manufactured well, they last a very long time. But so many of them aren't -- there's a huge problem with fakes, too -- that we see early failures. I've seen LEDs fail intermittently, causing pulsing light sources (like a worn out fluro), I've seen colour mismatch after just hundreds of hours, I've seen package/bond failures, etc...Last edited by budm; 05-24-2015, 12:52 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
-
Re: Samsung UN32F5500 with bad LEDs
Really thanks for your help. I have the same monitor with the same trouble. I have a single burned led. I replace it for other new one (another characteristics), but it burn out again. I will try to put the led and maybe a 1N4007 or two in series. And see what happen.
Comment
-
Re: Samsung UN32F5500 with bad LEDs
The replacement LED may have lower current rating so it did not last.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
-
Re: Samsung UN32F5500 with bad LEDs
awesome post. after replacing my t-con board for no reason, testing/frying/fixing my inverter board, i found this post. cracked open and sure enough one stupid LED was all that was wrong. Replaced it with 5 series diodes and away she went. Not bad for a $30 tv off kijiji and oh ya 10 hours labor lol
Comment
-
Re: Samsung UN32F5500 with bad LEDs
Hi,
I have the same problem that was fixed by Samsung under warranty twice before but they refused the third time since it was out of warranty and don't recognize any "lemon law" service. Anyhow, I opened it up and probed around and after touching a wire jumper near the LED connector with a DVM probe the lights all lit. I watched it for about a half hour but started smelling a burning odor and then the LEDs went out. Since all the LEDs were working I thought that the PS board was bad so I orderd another. Replacing the board did not fix the problem so I opened up the LED panel and found one LED burned (the dome even fell off when I touched it). I pulled the strip out and saw some discoloration on 2 or 3 other LEDs. I started to test each LED but the PCB wiring seems strange and there are 3 pins on each LED (maybe they are just mounting points). The coating is tough and tried using a pin to push through but its hard to make contact. It looks like BUDM scraped away the coating and in his picture he put diodes across an area to the left of the open diode ... another reason to understand the pcb wiring. Has anyone tried putting a resistor across the terminals of one strip to simulate the voltage drop in order to test out the remaining LED strings? I appreciate any help to get this set working. Thanks.
Comment
-
Re: Samsung UN32F5500 with bad LEDs
I just cracked open a UN75F7100 does the top LEDs, the top 6 strips on the top side were out. It uses the same LED backlighting and there's 12 horizontal strips in all and they attach in 4 different places across one strip as there are four separate strips are connected together in series across the panel. The beginning of the 6 rows of strips for the power connector is had four shorted LEDs. Found it on eBay that I need and its on its way here. I cannot sell this TV due to the fact that I'm worried others will fail prematurely. Oddly I think someone has swapped out boards because the timer says it is only two hours on the panel. This is not true the guy told me it failed a year after ownership so someone must have replaced the main board and the power supply because of the power supply was missing two screws. Here's what the inside of a 75 inch backlit LED Samsung looks likeDid I leave the soldering iron on?
Comment
Comment