Facing TV Problems? Ask a TV Technician.
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Are you attempting to repair the tv yourself? If so, what have you done so far? research, testing, parts? And do you own a DMM and have previous experience testing live voltages on circuit boards?
Are you still with me?
Take the back off the tv, measure the DC voltages on the power board connectors. This model has several configurations, so I don't know which board(s) your tv has unless you give me board numbers or post photos. You are looking for 5v, 12v, 24v, etc when plugging in the power cord/pressing power button. Reply back with your voltages and board numbers/photos.
If this doesn't sound like something you want to attempt, let me know so I don't spend time waiting for you.
So you probably have good 5v since the tv is trying to turn on. You can test the 13/18v line on the 18 pin connector. You can also test the 12v and High Voltage output to the backlights on the 7 pin connector.
We want to know if the voltages are steady or jumping around while you are applying power and the tv is trying to turn on.
Also want to know if the backlights are flickering on at any point (this might only be seen in a dark room).
Sorry the 7 pin connector is not the HV to the back lights, I think that goes to the Tcon board....
The board has labels printed right on it that tells you which pin is supposed to be what voltage.
Also we are not disconnecting any connectors during these tests, so you have to get your meter probe down into the pin of the connector.
Do the back lights ever flicker or come on at any point? (probably can only be seen in a dark room)
Please try this:
-unplug tv power cord
-disconnect the wiring harness from the 18 pin connector CN802
-plug in the tv power cord
Do the symptoms change? Does the tv try to turn on? Do the backlights come on?
After test, unplug tv power cord and re-attach the wiring harness on CN802.
Next test you will need a short piece of wire to jump across pins on that connector:
-disconnect the wiring harness CN802 from the OTHER end, so that the wiring harness is hanging off the power board
-place a jumper across pin 18 (POW ON) and one of the 5V pins
After test, unplug tv power cord remove jumper, re-attach wiring harness.
Can you see the printing on the power board that tells you which pin is 18 POW ON ? and which pin(s) are 5V ?
Ok, when you are applying power with that jumper in place, does the meter read 5v on pin 18 ?
Given all the information gathered so far, I would suggest you replace the Main board first. That is the board with the audio/video jacks. These boards are not easy to find in stock and may only be available on ebay used. If you see any part numbers on that board, I can try to help you find one. Usually starts with BN94 or BN96.....
Check return policies with sellers, just in case!
samsung is notorious for using different part numbers for the same part. if the connectors look the same then it should work.
Hello, just checking back in to see if you still need help, or perhaps you would like to acknowledge that my time and input has been helpful?
Can you post a photo of the entire back of the tv showing all the boards in the shot.
We can try this:
-disconnect tv power
-disconnect ribbon cable that goes from Main board (on left) to Tcon board (on bottom under shielding)
-plug in tv power
Ok, reconnect that and try:
-unplug tv power
-disconnect the LOW VOLTAGE multipin connector going to the board on the far right (not the HV 2pin)
no, reconnect the other ribbon cable
Well, I am completely out of ideas. I will bow out and allow all the other experts here chime in.