Re: Samsung UN48J5000: Backlight Strip Burn
Still seeking advice....
Sleddriver
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Last Activity: 06-11-2018, 04:10 PM
Joined: 09-30-2010
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Re: Samsung UN65JS9500 No Power On
>Sprocket. Great find. Glad it was simple. Wish I had your luck with a UN48J5000 I was given. I solved the backlight arcing issue, now facing vertical, colored bars when it lights. My first time to dive into one of these. It HAS been educational and partially successful. Now I'm stuck trying to figure out if it's main or t-con or LCD drivers or panel or some combination therein.
Rats.......Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
No. I'm guessing it's something else. I also just don't want to throw parts at it....Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Still seeking further advice....Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
I discovered last night that the remote control is sending an IR signal and the IR recv'r on the set is receiving it as the red LED flashes. However, the only remote control button that appears to do anything is power on/off. So despite the burned IC/diode/resistor located in the IR recv'r/Power SW, it does appear to function somewhat....
I was hoping to bring up the menu but no joy. As shown above, when one side is unplugged, there is half a screenn that's white. Ditto for the other. Therefore it is applying voltage to...Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Tom66 was rather adamant regarding this. Yet I've watched some videos where the # of red led flashes actually meant somthing. Like an error code.
I have no experience nor SM to draw from.
I sure am glad to depend on my 28yr old 36" JVC CRT set. $2000 was a lot to pay for it way back then, but geeze....look at how long it's lasted! I calibrated it according to ISF standards and occasionally remove the back to clean the dust out. No bad caps either!!
Go figure.........Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
New information:
Plugged in the power SW/IR receiver module. Upon applying power, I see the red LED blink 7 times. Still looking for a Samsung TV blinking LED guide. Please advise if you have one. TIA....
Found post while searching from Tom66: "6 blinks means nothing. It is the normal Samsung power up routine. Every Samsung TV does the same. Anywhere from 4 to 10 blinks seems normal."
If true, I won't spend any more time searching.Last edited by Sleddriver; 05-23-2018, 05:08 PM.Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
I carefully cleaned all 6 sides of the ribbon cables between the main & t-con brds. Found nothing wrong. Also meas a few of the power rails. A bit tricky as they're very small. The PS conn. pins are hidden too close to a few AECs so access is restricted. I also carefully pushed on each LCD panel ribbon, gently flexing it. No joy.
When VAC is initially applied, there is ~ 5s delay before the backlights illuminate. At the same time, I see the white vertical stripes shown in the photos. It takes about 10s more for the...Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Think about it turned left to right rather than top to bottom.
No problem anyway as I installed it right. Very shiny side goes inside, dull side out. Initially wasn't sure if this set had a glass mirror face or not....Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
See above. Been there. Done that....Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Here are two more screen photos after disconnecting first one TCON to driver connector, then hooking it back up and disconnecting the other.
Please advise as I'm not sure what this test indicates. TIA....Leave a comment:
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Re: Samsung un48js8500
OP: I'm currently working on a 48J5000 set, with a BN44-00852A PS. Yours is much more robust than mine! No doubt due to being an 8000 series rather than a 5000.Leave a comment:
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Re: Samsung UN46EH5300 No Picture
Wow...this is indeed an old post. Long before my recent one which is similar. Wish he would have posted that SM. Schematics for these 'newer' SS's are indeed difficult to locate.Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Here are the screen photos:...Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Will do.
I used a loupe to look at the power SW/IR recv'r board. There is a tiny chip that partially melted. Might be TD1? Wasn't an R or C or D. Explains why it doesn't work.
BTW, it is possible to install an LCD panel wrong side out? Would the two panel connectors still match up?...Leave a comment:
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Re: Un50j5200afxza
Have you located a schematic or Service Manual for your set?Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Update:
Frustrated at why only the upper two LED BLs lit, I removed the PS connector to R3 (which contained the repaired strip mentioned earlier) and shorted the ends, completely removing R3 from power. Upon power on, rows 1, 2 & 4 completely lit! For the first time! I meas. the voltage drop across a good LED @ 3.08Vdc. The series current = 720mA.
Next I hooked back up the PS connector to row 3, removed the damaged right-hand section I attempted to repair and inserted a DVM across the end connectors of the left...Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
Shortly after clicking SUBMIT, I looked at my photo and it dawned on me that the burned LED in a series ckt means OPEN! Geeze....
Also noticed that my 2 22R's in series were way over-powered as they were now burned. I replaced them with a chain of 10 + 15 + 14 Ohm R's rated at 10W. Across the 2nd burned out LED, I used 3 10R's in series rated at 5W each. Applied power. Top two strips of 16 LEDs lit brightly. Bottom two strips nothing. Current draw = 1.5A! Quickly pulled the plug to prevent cooking any R's. I found a 15R...Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
I was curious whether the whole strip of 8 LEDs (both left and right sections) were at fault or whether the large current draw was due to either the left or right. So I lowered the bench supply to 11Vdc and measured current draw through half-strips made up of 4 LEDs. Turns out the one I repaired drew 450mA with 11V while its left half-strip only drew 70mA.
Next I experimented with just how much R to add to bring the repaired strip into line with the rest: About 44 Ohms brings it 65mA. Close enough. I was hoping that so tamed,...Leave a comment:
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Re: Samsung UN48J5000: Backlight Strip Burn
I'll have to give this a further THINK.
I saw that thread. That's some serious burning damage! Fire hazard category.
Seems to be some confusion on just which LED replacement strips are appropriate. First I searched on "2015 SVS48 FCOM FHD DOE A RIGHT REV1.2 150605 LM41-00120Q_LM4100149A" which is what's in this set, which is rather long. Didn't see many hits. I found this string on a label stuck to the LED strip: "P9JYC41608C4Y06337297A". No hits on that. Found the panel sticker...Leave a comment:
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