I have a led tv that only has the power light no picture, I know the power. Board is shorted..

Based on the symptoms you described, it sounds like the problem is likely with the LED backlight strips on your Samsung TV model DF400BGLV1H. When you disconnect the LED connector, the standby voltage comes back, and the T-CON board blue LED lights go on and the boot sound. Also, the fact that the power supply board measures 225 volts on pin 1 and 2 of the D+ on the connector when disconnected and toggles off when connected to the LED, suggest a short on the LED side.
It is possible that one or more of the LED backlight strips may have failed, causing a short and preventing the TV from powering on properly. In this case, replacing the LED backlight strips would be the most likely solution to the problem.
Keep in mind that it is always a good idea to double-check all connections and components for proper function and continuity, before replacing any parts.
It's recommended to seek the help of a professional technician or contact Samsung customer service for further assistance, especially if you are not familiar with TVs. Also, make sure you get the right replacement parts and follow the instructions.

Came on cuz led runs on 2 + sources. By shorting u made both side recive + voltage

I had the same problem, changed the power board, main board and t con board. I purchased the led light tester, one string of lights was out. Replaced the lights, and 1/2 of the tv worked. I broke the black tab that connects the ribbon connector to the bottom panel. What a learning experience. Now I have to figure out how to change the ribbon connector.

hi 7 red flashes- main board over heating, can be short on power board or main logic board, thanks

shaun

hi, the led or leds in the panel may shorted, thanks

shaun

You may want to shop for that board or at least consider removal of the HDMI socket in question---tested for shorts there I presume?

Sony tv led and blinking codes

• 0 times, Diagnosis: Power does not turn on. Possible causes include: Power cord is not plugged in, Fuse is burned out (F6001) (G board). Symptoms of the problem: Power does not come on, No power is supplied to the unit, AC power supply is faulty.
• 2 times, Diagnosis: B overcurrent (OCP). Possible causes: H. OUT (Q8024) is shorted. (D board), +B PWM (Q8035, 8038) is shorted. (D board) Symptoms of the problem: Power does not come on, Load on power line is shorted.
• 3 times, Diagnosis: +B overvoltage (OVP). Possible causes: IC501 is faulty (G board), IC5002 is faulty (G board). Symptoms of the problem: TV has entered standby mode.
• 4 times, Diagnosis: Vertical deflection stopped. Possible causes: +- 15V is not supplied. (D board), IC8003 is faulty. (A board) Symptoms of the problem: TV has entered standby state after horizontal raster, Vertical deflection pulse is stopped, Power line is shorted or power supply is stopped.
• 5 times, Diagnosis: White balance failure (Not balanced) Possible causes: Video out (IC7101, 7201, 7301) is faulty (CR, CG, CB board), CRT drive (IC309) is faulty (A board), G2 is improperly adjusted. Symptoms of the problem: No raster is generated, CRT cathode current detection reference pulse output is small.
• 6 times, Diagnosis: LOW B OCP/OVP (Overcurrent/over voltage). Possible causes: +5 line is overloaded. (A, B boards), +5 line is shorted. (A, B boards). Symptoms of the problem: No picture.
• 7 times, Diagnosis: Horizontal deflection stopped. Possible cause: Q8035, 8038 is shorted. (D board)
• 8 times, Diagnosis: High voltage error. Possible cause: T8005 is faulty. (D board)
• 9 times, Diagnosis: Audio error. Possible causes: +- 19V line is shorted. (A, B boards), IC708 is faulty. (A board), PS701 or PS702 is opened. (A board). Symptoms of the problem: No sound

I hope this will be of some help to you

Good day sir chris!!!!

Welcome in fixya and I'm happy to work with you...

OK lets proceed to your TV problem..

The possible problem is not the power supply...There some shorted parts on inverter board,T-con board or main board so that the power will not initialize due to that shorted problem..

I teach you how to find which board is shorted or cause of that fault..

Just follow this procedure below.

1. Open the back cover
2. Look at the inverter board..it is slim board that have small transformer on it.
3. unplug the inverter board first.Then try to power it on...
4. If the LED on front of TV will not flashes from bright to dim it means you have shorted inverter board try to replace it..
5. If the flashes remain..go to next step..Power off tv then reconnect inverter board,after that unplug T-con board..Then power on.
6. If the LED on front of TV will not flashes from bright to dim it means you have shorted T-con board try to replace it..
7. If all those procedure done but still problem persisted the only problem is main board..Replacing main board will fix the problem..

NOTE: When unplugging and replacing of all board make it sure to memorize all connection or its better if you take a picture on it for future reference..

Hope this solution will be helpful..Any rate will much appreciated..

Thanks for using fixya..have a nice day!!

in the lcd tv there are three main parts
1)the inverter board(pannel)
2)the main board .
3)the power supply board.
----------
if there is no power at all them main board is faulty.if no front led light is coming ON there is no power .so the main board is faulty.on the main board there is a fuse located you have to replace that and check first if still no power main board needs to be checked and replaced
---------------
if there is sound but no picture and front led light is ON then its inverter board panel problem.if this is your case replace inverter panel.its located in the lower side of the lcd in the inner area below the main board.
-----------
but if there is just front led light blinking , but no picture or sound then its power supply board problem.
------
but as you mentioned that the tv turns ON for some seconds then automatically turns off this indicates that the power supply board is not faulty but there is a component on the board that is getting over heated because its got weak so due this overheating of a component the circuit gets short and tv shuts off.
on power supply board there are some capacitors and ic located.if any of the component gets short or budged up then it short the power supply board.so you can check the components on power supply board with multimeter and get it replaced by using soldering iron.
----------
also you can get new replaCEment power supply board.this clears the problem completely.
---------
you can get the required board and components at ----- www.partstore.com -------- or from ------ www.radioshack.com ----
---------
if you are not familiar with doing this you can get it done by local tv repair technician familiar with this model tv.
-----------
This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

in the lcd tv there are three main parts
1)the inverter board(pannel)
2)the main board .
3)the power supply board.
----------
if there is no power at all them main board is faulty.if no front led light is coming ON there is no power .so the main board is not faulty.on the main board there is a fuse located you have to replace that and check first if still no power main board needs to be checked and replaced
---------------
if there is sound but no picture and front led light is blinking then its inverter board panel problem.if this is your case replace inverter panel.its located in the lower side of the lcd in the inner area below the main board.
-----------
but if there is just front led light blinking , but no picture or sound then its power supply board problem.
------------
on power supply board there are some capacitors and ic located.if any of the component gets short or budged up then it short the power supply board.so you can check the components on power supply board with multimeter and get it replaced by using soldering iron.
----------
also you can get new replaCEment power supply board.this clears the problem completely.
---------
you can get the required board and components at ----- www.partstore.com -------- or from ------ www.radioshack.com ----
---------
if you are not familiar with doing this you can get it done by local tv repair technician familiar with this model tv.