Samsung 46 inch LCD TV Autopsy

its in bits now

Category:

Science & Technology

Tags:

• Samsung Electronics
• PCB
• control
• backlight
• diffusion
• layer
• Samsung

[MrCinimod93]

What wold make a lcd come on for 30 40 seconds then shut off but the sound stays on then i shut it off then back on then 30 or 40 you get the point any help wold be appreciated

[Aussie50]

@MrCinimod93 sounds like the backlight inverter is failing, monitor its voltages as it cycles on and off, you will probably find the power for the backlight cuts out while control stays on

[007bondjb]

Cool video. I'm in the HVAC business. I saw some semi hermetic compressors in your shop. You must be a AC technician too?

[Aussie50]

@007bondjb I.m not a HVAC tech but I use a lot of that sort of equipment in my hobby shop.

I do make a lot of money cleaning up/repairing window AC units and selling them tho. same with on-site coil & filter cleaning, since most ppl around here never clean them.

[Lachlant1984]

That's really interesting, I have an Acer 17 inch computer monitor that's about 9 years old and I just assumed there were CFL's on all 4 sides, top, bottom, left and right side, but it's possible that there are rows of them as is the case here. What was actually wrong with this TV set when it came in? I hope you can do something constructive with the CFL light assembly. Do LED based TV sets have a large array of LED's behind the LCD panel, or are the LED's just around the 4 edges?

[Aussie50]

@Lachlant1984 I've never seen inside LED panels at all, but older PC monitors usually have 2 CFL's, 1 top and 1 bottom.

however some do run loads of tubes like this one. they are typically thicker than the top/bottom lamp ones

[MrVicist]

And to think.... if Photoinduction hadn't thrown that brick into a washing machine, I would never have found your outstanding channel.

[More350Power]

" Hurry up and die already, your distracting me " :D lol

[sethat8e]

you gotta keep an eye on it so you dont start a fire but ive had some success with using a hairdryer to reflow

[sethat8e]

i think i might have had one of those tv's (same model) with some issue but i got rid of it

[EastAngliaUK]

Very interesting stuff.

[bradshaw899]

Those diffuser layers can be used to make a solar ray that can burn through just about anything. Find kipkays solar death ray vs ipod vid for more on tht

[Knaeckebrotsaege]

@MrCinimod93 failing backlight, or bad capacitors. Good place to get help with either of those problems (or diagnosing the problem in general) would be the badcaps . net forums.

If you decide to post there, just don't use off-site image hosting. A lot of the older folks there dislike that and tend to ignore the thread, which doesn't really help fixing the thing ;)

[Knaeckebrotsaege]

@BoomBoxDeluxe The brightness on those is varied by the mainboard. the little (usually 5pin) connector Ed mentioned has the pin for adjusting the brightness (he actually mentions it.. "DIM").

Backlight intensity is varied through a voltage to a special pin, usually in the range of 0 to 5V DC.

Another pin turns the inverter on and off completely, in those Samsung LCD TVs it's usually 0V off, 3.3V on.

Most of the time the values are silkscreened on the solder side of the board

[Knaeckebrotsaege]

@johnofe I've seen quite a few sub-20" (mostly 17" and 19") LCD monitors with backlight assemblies like this, instead of the cheaper and more comon edge-lit ones.

AU Optronics made quite a few of them, and they're pretty common in industrial/high-brightness stuff.

[Knaeckebrotsaege]

@Aussie50 I've shot a pic for a forum post once, showing off the LED backlight assemblies from two cracked LED backlit LCD panels, one from a netbook (10.1") and a regular laptop one (15.6") in comparison to a standard TO-220 package IC.

The upper one with the wider LED spacing is from the netbook, the lower one from the laptop.

They're basically used the same way as CCFLs (LED strip at the top or bottom)

oh yeah..and they're insanely bright :O

bambooz.pytalhost . net/badcaps/led-backlight.jpg

[Knaeckebrotsaege]

I'm a bit late watching this, but in case you need it, I've got schematics for a lot of Samsung IP boards (IP = Inverter/Power).

They should have either an IP-xxxxxx number somewhere near the main pinout table, or have a Samsung-typical "BN44" number on a serial number sticker somewhere.

Examples of BN44 numbers would be BN44-00199A or BN44-00264C and so on. If it's on the serial number sticker, it will be as one string, i.e. BN440199A. just look for something that starts with BN44 or BN4400

[MrCinimod93]

i am not that good with fine electronics i figured is was something to do with the inverter but just wanted to get your opinion on it plus dad may have broke the lcd when he moved the parts to it with out telling me and losing the dam screws if it don't work out in the end it will go back in the dumpster it came out of