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If you have a Samsung Plasma PS50A550 which will keep clicking and not come on, the fault is in the power supply .Check Power supply if its a BN44_00222a. This PCB cost almost $ 300.00 can be fixed for around $ 30.
The fault is in the 5.3v supply to the T.Con PCB. On the Power supply check voltages.VS will not come on unless the T.Con pcb is active.
Check on printed circuit side of PCB on secondary side there are 3 IC close to one another. 2 IC'S are 8 pin and one is 16 pin. Replace both 8 pin reg IC (25h3ll ) these are available from RS components. Part number is STS25NH3LL. The 16 Pin IC is a L6725A but this is not faulty.
lets keep these good TV working for another 4 years.
Check the Mosfets on the P0981 pcb this is the pcb that has the inputs and such.. not the power Supply board. Fets are mounted to the Heatsink under this pcb, but you can get to the pins as they come up thru the pcb . T11, T7, T4, T1 These have 3 terminals Check for shorts or reading the differ from one to the next.. These are Fets so From G to D and G to S shoudl be open. D to S will read some value as there is a Diode across it.. Also If these are bad the Gate Driver IC IC 11 or IC 3 might be the cause. Mine had two shorted FETS and the IC that drove them was bad. IC is IRS20955 Found some tech reports that show this ic was updated to IRS20957 due to issues.. So I updated both mine and replaced all 4 FETS. Good luck .
A common problem with samsung flat panel tv's is that the capacitors on the power supply fail.
You will need to remove the back and check the power supply pcb for puffed caps. To do this you will need to lay the tv face down on a cushioned surface and remove all the screws that secure the back of the tv. You will need a surface large enough to support the whole tv. This is to protect the panel. DO NOT place tv on surface where the front of the tv is not supported by the frame.
Remove the back of the tv and check for puffed caps on the power supply pcb. This is the board that the power cord is attached to.
If there are any puffed caps, you will need to replace them with equal or slightly higher valued caps.The value ratings are printed on the capacitors in mfd and voltage.
You will need a soldering iron to remove and replace them.
After reinstalling the power supply and before you put the back on, hook up a power cord to the tv and try turning it on. If you see a backlight come on, the tv is working. Try hitting the meny button and see if you have an on screen display. If you do put the back cover back on.
If tv doesn't power up, then the power supply pcb is probably bad. Try checking the voltage outputs from the connectors on the side of the pcb. Use a digital multimeter, connecting black lead to chassis ground and read lead to check voltage on the pins of the connectors. There should be voltage levels printed next to the connector on the pcb. Let me know if this helps you.
It sounds like the relay on the power supply pcb. What make and model is it? You might want to check the power supply pcb capacitors to see if there are any that are puffed up. To do this you need to place the tv face down on a padded surface that will support the whole tv. This is to protect the panel from damage. Then remove all screws that are securing the back of the the tv. Remove the back and check the power supply pcb. This is the board with the power cord going to it. If they are puffed they need to be replaced with equal or slightly greated values. The values are mfd and voltage. You will need a soldering iron to remove and install the new caps. If caps look good, then check the voltage levels of the dc output (marked on board next to the connector) with a dc multimeter. If all the voltages are correct and constant, then your power supply is good. But, this does sound like a power supply issue
Look for bad or bulged capacitors in the power supply PCB. The value of the caps will be on the side of the cap. Also look at all the fuses an the power supply and x and y drive boards. Thanks for using fixya. Take a moment to rate this responce.
Try these first. This TV is an oldie 1988?
POWER SUPPLY STARTS BUT WONT RUN. CHECK FOR SHORTED D909 OFF T905 PIN 17 AND/OR SHORTED IC401. (PCB-MAIN) D909 PT.# 264P521020 IC401 PT.# 272P174010 *** ( TO PREVENT REPEAT FAILURE , REMOVE T905 FROM PCB AND RE-SOLDER LEGS OF TRANSFORMER AND THEN REINSTALL) 2. POWER SUPPLY WONT RUN. CHECK FOR OPEN FOIL AT PIN 2 OF T905. (PCB-MAIN) 3. POWER SUPPLY WONT RUN. CHECK FOR OPEN R903 (220KOHM) AT PIN 3 OF IC901. (PCB-MAIN). ALSO CHECK THE VERTICAL OUT IC, LOOK IN POWER SUPPLY CIRCUIT FOR LEAKY CAPS. YOU CAN TELL BY BLACKNESS ON THE BOARDS ON THE NEGATIVE SIDE OF THE CAPS.
Remove the back cover.
The switch mode power supply board is in the middle at the top. It's a large board.
Along the top edge of the board the model number will be printed. It should be a bn96 00249a but check to be sure before ordering one.
Take special note of the 5 fan headers located on the lower left of the board - all unused.
Explains why so many of them have failed.
Mine has been dead for almost a year now.
I know which part on the board is bad, but so far, have not been able to locate a place that will sell me the IC.
I'm not paying $300.00 for the whole board when all it needs is a $15.00 IC.