Samsung UN46EH500F

[heavymachines]

OK, this tv i was able to narrow down to main, with main disconnected backlights turn on and is crisp. Started doing some testing and found out it has a short to ground in the audio section, both pin1 on ic301 and pin1 on ic 701 are both shorted to ground, will see if i can isolate the short stay tuned. if somebody has felt with this before please speak up thanks.

[budm]

Re: Samsung UN46EH500F

Please provide the P/N of those two IC's so we can find out what pin 1 is used for.

[heavymachines]

Re: Samsung UN46EH500F

Ic 301

NTP-74125
T200710AF
226 5


Ic701
MP222EC
23K G4 With underline
E3NK

[heavymachines]

Re: Samsung UN46EH500F

Here is ic701 can't find the anything on the other yet. Closest thing i could find is NTP-8230 looks same on outside but who knows on inside.



Thinking about removing ic701 and see if short goes away.

[budm]

Re: Samsung UN46EH500F

That is RS232 IC. The main board has RS232 port? I do not think that is correct.
What is the resistance reading on that pin 1 and GND?

[budm]

Re: Samsung UN46EH500F

We need to see the pictures of the board.

[heavymachines]

Re: Samsung UN46EH500F

We need to see the pictures of the board.

Here it is provided by shop jimmy. Don't have a camera atm as my phone got ran over the other day got new screen coming for it.

[heavymachines]

Re: Samsung UN46EH500F

That is RS232 IC. The main board has RS232 port? I do not think that is correct.
What is the resistance reading on that pin 1 and GND?

According to my fluke 75 it is 00.1 to 00.0 in ohm range. in diode mode it beeps. No it don't have a serial port perhaps i misidentified it but that is the part numbers i listed in post #3 had to use a digital microscope to see the tiny print a magnifying glass wasn't strong enough for my eyes anyhow.

[budm]

Re: Samsung UN46EH500F

Well, looking at the picture of that IC701, PIN 1 (ARROW) is connected to GND plane.

[budm]

Re: Samsung UN46EH500F

What is that black jack CN301 is for? It looks like for serial port.

[budm]

Re: Samsung UN46EH500F

What are the Voltages on the power supply connector that goes to the main board?
Report pin names and the readings.

[heavymachines]

Re: Samsung UN46EH500F

Well, looking at the picture of that IC701, PIN 1 (ARROW) is connected to GND plane.

Dang i should have seen that, well now that you mentioned it the other ic looks that way too


Well much to learn yet been though i should have known this. Anyhow is it a safe bet if backlights come on without main connected that the main is faulty? i probably should do some voltage readings and list them.

[budm]

Re: Samsung UN46EH500F

See post 11 so we can see what are missing.

[heavymachines]

Re: Samsung UN46EH500F

What is that black jack CN301 is for? It looks like for serial port.

That goes to the power supply.

[budm]

Re: Samsung UN46EH500F

That goes to the power supply.

No, that cannot be, I can see two traces from that miniphone jack CN301, NOT CN201.

[heavymachines]

Re: Samsung UN46EH500F

See post 11 so we can see what are missing.

Will do first thing on morning not by tv atm. However here is a video of the same tv so you have an idea of layout. However evidenced by this video this tv had several Leds out , this will be the first i ever seen with that many leds out and still turn on. I have been able to get backlights to turn on by disconnecting main will have to take a double take tomorrow as well to see if there is dark spots which i think will be hard to do with no image we'll see.

So far every led repair i've done only has 1 to 3 led out and it will refuse to turn on. This video shows tons out

https://utabby.com/en_US/video/020/K...cklight_repair Sorry here it is, lord i am going to bed lol

[heavymachines]

Re: Samsung UN46EH500F

No, that cannot be, I can see two traces from that miniphone jack CN301, NOT CN201.

Ok yeah 2 headphone looking jacks i will look on back panel in morning see what label it has i would imagine one is input and the other is out? we'll see.


Wait what you said it looks like a serial port? next to the tuner box? The port above the fiber optic port? Never seen that type before in a microphone/headphone jack. a serial port really? i will have to look on back cover and see if it has a label for it.

[budm]

Re: Samsung UN46EH500F

OK, it is the serial port (service port, E-LINK). Lots of device out there use miniphone jack for serial port, it uses a lot less space.

[heavymachines]

Re: Samsung UN46EH500F

OK, it is the serial port (service port, E-LINK). Lots of device out there use miniphone jack for serial port, it uses a lot less space.

Ok interesting. Learn something new. So with that being said i did upload the correct data sheet for ic701 ? post #4



Not that it really matters as it may not be the problem at all.

[heavymachines]

Re: Samsung UN46EH500F

Ok here is voltage readings on Cnm803

pin # / Pin label / reading
pin1... B13v... 12.77v
pin2...Pwm-Dim... .077v
pin3...B13v....... 12.77v
pin4...B13v..... 12.78v
pin5...Vamp.... 12.78v
pin6... Blu_on/off .050v think this is the problem
pin7...Vamp 12.78v
pin8 Gnd
pin9 Gnd
pin10 Gnd
pin 11... B5v... 5.24v
pin12... A5v... 5.24v
pin13...B5v... 5.24v
pin14... Power on/off 3.51v

Also did the backlight check with main disconnected it does look uniformly lit so i think we're ok there.