Hello,

I managed to snag this TV for free but it has what appears to be a fixable issue. I apologize for the length of the post, but I think it will be helpful. I am still working on diagnosing the TV, and wouldn't mind some feedback. I'm trying to get the TV to predictably and reliably fail, so I can properly diagnose it. There are a number of boards available for it. The power board is BN44-00667a. I'll snag the main board model after I get home today.

The symptoms thus far:

Shuts down after some use, slow to start up, sometimes it doesn't start up,...

Re: Samsung UN32F5500 LED TV Backlight issue

Just an update on the tv I was working on. I fixed it and it's back in its home.
The leds I used were not a great match for the existing ones. They were more white or yellowish when compared to the purplish factory ones. Even across a single batch there was variability in regards to brightness, and color temp. I assume part of this is due to damage incurred during soldering. I improved my technique by the end. I cannot recommend the LEDs I mention in the previous post. Perhaps if all the strips were redone the color wouldn't matter,...

Re: Samsung UN32F5500 LED TV Backlight issue



Personally I scraped old the led with soldering iron then cleaned the contact. Use caution as you can damage the contact and may need to rebuild it. When you put the new one on, use flux. It's essential to get the solder to flow under the contacts on the led. LEDs melt super easily, so I wouldnt apply the iron directly to them, let the solder flow into the contacts. Double check polarity first as well. After that I used electronics grade silicone to glue the lens on again. Good luck buy extra LEDs in case you damage the...

Re: Samsung UN32F5500 LED TV Backlight issue



The temp of the LEDs seem to match very well. I couldn't tell which ones were replaced when they were lit up.

Thanks for sharing...

Re: Samsung UN32F5500 LED TV Backlight issue

Some updates.

I checked my notes, and I realized that I found all the replacement parts, sold in the shopjimmy kit, including mosfets already.

[URL="http://www.digikey.com/product-search/compare/en?returnUrl=%2Fproduct-search%2Fen%3Fkeywords%3D10NM60N&part=497-12564-5-ND&part=497-9098-5-ND&part=497-12276-ND&part=497-12246-ND"]http://www.digikey.com/product-search/compare/en?returnUrl=%2Fproduct-search%2Fen%3Fkeywords%3D10NM60N&part=497-12564-5-ND&part=497-9098-5-ND&part=497-12276-ND&part=497-12246-ND[/URL]...

Re: Samsung UN32F5500 LED TV Backlight issue





Thanks everyone for your input. When my dmm is in auto range, and I check voltage on the only active pins, the top led strip lights up. I ended up swapping all 5 through the top slot to make sure they light up. The color isn't as blue, but I haven't glued the lens back on yet either. I'm waiting to glue, just in case I blow one. I have a feeling that the led side of the psu has an issue since it doesn't light any of the strips up. So my game plan is to des older and check with multimeter. I've identified...

Re: Samsung UN32F5500 LED TV Backlight issue



Repaired all the broken LEDs. After plugging them all into their sockets, connected to just the power supply/inverter, still no love. I was under the impression if the main and tcon board were unplugged, then the backlights should all be lit up. The only power I get in this setup up is the pins listed above. Do I need the main board to be plugged in? I ran out of time today to check that. If my inverter section of my psu is busted, anyone know what the likely culprit is? I wasn't sure how to test mosfets in circuit, but...

Re: Samsung UN32F5500 LED TV Backlight issue

Hello,

My boss said he had a bad Samsung tv, which sounded like a bad cap, but turns out I'm having a similar issue with the backlight. The unit has 5 bad leds over 3/5 led strips, tested with my fluke117 (via diode+resistance functions) and ~3v battery pack.

I've measured the power pins 1-16 to the led array. All produce zero volts aside from pin 11: 188v, pin 12: 213v. when I measure min/max it cycles ~+/-14 v. Just an observation Autorange mode seems to light up the top strip while manual does not. ...