possible red blinking light code, no power on samsung led tv

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

A question about this tv issue, does it still seem like its the mainboard issue even though I can never turn on or off the tv because as soon I plug in the power cord the front red lights start doing the blinking code sequence.

So will a bad mainboard cause the power supply from not even fully turning on the tv and such? I sent the mainboard back to the ebay seller he said he can send me another board before giving me a refund. thanks

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

What are the voltages reading now?

Also where did you get the replacement board?

I got it used on ebay supposedly pulled from working TV with cracked or bad screen. I contacted the seller he's going to send me another mainboard. I'll do voltage later today. Thanks

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

What are the voltages reading now?

Also where did you get the replacement board?

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

Installed another mainboard and same exact issues as posted originally. What now? Thanks

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

I ordered a mainboard I'll report back here when i get it and install it.

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

Cool soon maybe today I will order the main board. thanks

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

You say " form the main board" but you mean from the main board right? So the issue is the main board bad? I would like to learn a little bit so it should be steady and not go lower than 2.5 volts right and what does the 3.3 mean?

I should buy a new main board and that's it? Thanks

The PSU should always have 5v running as it is for standby, Your PSU is indeed giving the 5v. So the 5v runs through to the mainboard... When the set is powered on the mainboard sends voltage >2.5v to the PSU... This then turns on all the other voltages allowing the set to power completely up.

So basically the main is not sending the Power ON/OFF signal properly meaning its faulty

You can rule out the PSU by forcing the PSU on.... Using ~500ohm resistor you can jump the 5v to the Power ON/OFF pin while the connector is removed from the mainboard. Doing this causes the PSU to think that the signal has been sent from the mainboard thus switching all the power lines on. You will be able to check all voltages on the connector again and see they will have now changed and be correct. Of course if after this they are not correct then there is a PSU issue. Sets will vary as to how to force the PSU on, Some require 5v to be fed to the ON/OFF pin and other require the ON/OFF pin to be jumped to ground.

There are a few basic components that can be checked on the mainboard but pretty much as a rule we advise replacement

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

No pin's names? That would have made it easy for us to spot the problem.

1- GND: I know this is ground 0.00v
2- OD_ON: 0.01
3- B13V: from 0.10v to 0.20v
4- PWM_DIM: 0.40v
5- B13V: 0.10v
6- N.C.: from 0.10v to 0.20v
7- Vamp: 0.10v
8- BLU_ON/OFF: 0.00v
9- Vamp: 0.10v
10- GND: 0.00v
11- GND: 0.00v
12- GND: 0.00v
13- B5V:0.01v
14- A5V: 5.31v
15- B5V: 0.01v
16- Power on/off: from 0.25v to 3.31v

Pin 16 is the problem form the main board, it should be steady at >2.5V (3.3)

You say " form the main board" but you mean from the main board right? So the issue is the main board bad? I would like to learn a little bit so it should be steady and not go lower than 2.5 volts right and what does the 3.3 mean?

I should buy a new main board and that's it? Thanks

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

No pin's names?

Sorry I thought someone had a schematic of the pin names layout brb with that...

I put the names above in the readings.

[budm]

Re: possible red blinking light code, no power on samsung led tv

No pin's names? That would have made it easy for us to spot the problem.

1- GND: I know this is ground 0.00v
2- OD_ON: 0.01
3- B13V: from 0.10v to 0.20v
4- PWM_DIM: 0.40v
5- B13V: 0.10v
6- N.C.: from 0.10v to 0.20v
7- Vamp: 0.10v
8- BLU_ON/OFF: 0.00v
9- Vamp: 0.10v
10- GND: 0.00v
11- GND: 0.00v
12- GND: 0.00v
13- B5V:0.01v
14- A5V: 5.31v
15- B5V: 0.01v
16- Power on/off: from 0.25v to 3.31v

Pin 16 is the problem form the main board, it should be steady at >2.5V (3.3)

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

brb doing that now....

here are each pins with the readings my multimeter was set to the dial of 20 vdc:

1- I know this is ground 0.00v GND
2- 0.01v 0D_on
3- from 0.10v to 0.20v B13v
4- 0.40v PWM_DIM
5- 0.10v B13v
6- from 0.10v to 0.20v N.C
7- 0.10v Vamp
8- 0.00v BLU_On/Off
9- 0.10v Vamp
10- 0.00v GND
11- 0.00v GND
12- 0.00v GND
13- 0.01v B5v
14- 5.31v A5v
15- 0.01v B5v
16- from 0.25v to 3.31v Power On/Off

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

brb doing that now....

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

Yes

Write it out with what pin you are testing then the reading :

For eg (Your board will differ on what is written)

5vstby - 5v
GND - 0v
STBY - 5v

etc etc

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

OK so I have to plug in and turn on the tv right? actually tv wont necessary turn on because right away from plugging it in the red light bottom right corner of the tv will start the light code sequence but maybe that's enough to test.

The black probe I put against a metal screw or chassis right then touch each pin and write down the readings right?

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

Yes when we get those voltages off the connector

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

Anyone here live can continue in helping find out what component is messed up on my tv....

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

I use a pin in the connector itself at the side of each wire then test against that

[pctektgg]

Re: possible red blinking light code, no power on samsung led tv

Yes it can if its failed open.

We can figure it out from voltage outputs etc

Ok but the pins underneath the board do we need to test those too only the top are exposed?

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

Check out this video same exact model code I have and same symptoms with the lights flash sequence, the fix in the video was a new led backlight part, one of the led's was burnt. Does one single burnt led cause it to not turn on?

https://www.youtube.com/watch?v=xsQQuiP3KAE

Yes it can if its failed open.

We can figure it out from voltage outputs etc

[newtothis]

Re: possible red blinking light code, no power on samsung led tv

Sorry yes I was dealing with other threads too.

No it has to be in the tv connected and powered on