Samsung un32f5000 no video

[redtux777]

Re: Samsung un32f5000 no video

unhook the main board from the power supply. Take a 500 Ohm to 1k resistor and jumper PSon and BLUon to 5v Stby. The power supply should be all on and the backlight should be on. If that doesn't go, unplug the backlight on the power supply and measure all outputs with you DMM on DC, use chassis GND or the GND pin on the connector for the negative lead.

heres my test results ...



#1- 13.1v (b13v)
2- 4.7v (pwm_dim)
3-13.1v (b13v)
4-0v (eco_on)
5-13.1v (v amp)
6- 4.7v (blu_on)
7-13.1v (V amp)
8-0v (gnd)
9-0v (gnd)
10-0v (gnd)
11-5.3v (b5v)
12-5.3v (b5v)
13-5.3v (A5v) ---is this the standby 5v?
14-3.1v (PS_on/off)

[budm]

Re: Samsung un32f5000 no video

The command signals are fine:
6- 4.7v (blu_on)
14-3.1v (PS_on/off)

13-5.3v (A5v) ---is this the standby 5v? Fine, 'A' for always ON power supply which means STBY power.
I would agree with Tom that you may have open LED in the LED string.

[redtux777]

Re: Samsung un32f5000 no video

The command signals are fine:

I would agree with Tom that you may have open LED in the LED string.

More info on this?

What does this mean- were do I test?

[budm]

Re: Samsung un32f5000 no video

https://www.badcaps.net/forum/attach...7&d=1423588702
Can we see the bottom side of this section to see how the LED strings are connected together?

[redtux777]

Re: Samsung un32f5000 no video

https://www.badcaps.net/forum/attach...7&d=1423588702
Can we see the bottom side of this section to see how the LED strings are connected together?

Pull the board to get a pic?
Ok...

[redtux777]

Re: Samsung un32f5000 no video

Pull the board to get a pic?
Ok...

How are these?

[redtux777]

Re: Samsung un32f5000 no video

Are we talking led string problem like this?

https://www.badcaps.net/forum/showth...069#post481069

[tom66]

Re: Samsung un32f5000 no video

Yes, probably something like that.

[redtux777]

Re: Samsung un32f5000 no video

maybe thats whats rolling around behind the screen...
No screws holding on the sheet metal. hope this is as easy as taking apart a laptop pc.....

[tom66]

Re: Samsung un32f5000 no video

It's pretty tricky. The part you have to be most careful around is the LCD panel. Once you get that out and safely stored, the rest is pretty easy. Make sure to line the panel up properly when fitting the case, or you'll crack it...

[redtux777]

Re: Samsung un32f5000 no video

It's pretty tricky. The part you have to be most careful around is the LCD panel. Once you get that out and safely stored, the rest is pretty easy. Make sure to line the panel up properly when fitting the case, or you'll crack it...

Should i go at it from the screen side bezel or start taking off the boards and going in that way?

[tom66]

Re: Samsung un32f5000 no video

On every panel I've worked on, the front plastic frames come off (you may have to loosen some internal screws), then you can access some screws around the LCD panel and lift off the panel that way. Be careful, as the LCD panel may move when you do this, so have the panel laying on a flat surface first.

[redtux777]

Re: Samsung un32f5000 no video

On every panel I've worked on, the front plastic frames come off (you may have to loosen some internal screws), then you can access some screws around the LCD panel and lift off the panel that way. Be careful, as the LCD panel may move when you do this, so have the panel laying on a flat surface first.

There are a lot of clips holding the bezel / screen on to the metal.
I have it mostly open and can see inside there is one glass top lose inside

[budm]

Re: Samsung un32f5000 no video

That is the LENS for the LED, for that LENS to come off the TV must have been hit hard. You may want to look real close at the LED strips.

[redtux777]

Re: Samsung un32f5000 no video

That is the LENS for the LED, for that LENS to come off the TV must have been hit hard. You may want to look real close at the LED strips.

Looks like where the one that came off looks a little brown ...hard to see at this point

[budm]

Re: Samsung un32f5000 no video

You can use 3V batteries with 100 Ohms resistor in series with the battery to limit the current and use it to probe for bad LED (you will have to figure out the Anode pin and the Cathode pin).
Your is similar to this 32E:
https://www.badcaps.net/forum/showpo...&postcount=107

[redtux777]

Re: Samsung un32f5000 no video

You can use 3V batteries with 100 Ohms resistor in series with the battery to limit the current and use it to probe for bad LED (you will have to figure out the Anode pin and the Cathode pin).
Your is similar to this 32E:
https://www.badcaps.net/forum/showpo...&postcount=107

1k resistor work? I have one or I can go get 100ohm resistor

[tom66]

Re: Samsung un32f5000 no video

1k is probably too high.
A coin cell (CR2032) will work without a resistor - the coin cell's internal resistance will safely limit current enough.

[redtux777]

Re: Samsung un32f5000 no video

so if one bulb is out they all go out? there in series?

[tom66]

Re: Samsung un32f5000 no video

so if one bulb is out they all go out? there in series?

Not always in series but one failure will cause them all to go out as it will trip the protection circuit.