Samsung Plasma PN43F4500BF will not power on. When plugged in no relays click. Every few seconds the screen fully lights then goes dark constantly doing this over and over every few seconds. Doesn't seem to listen to power commands from the power button or remote control. It's like as soon as you plug it in it seems like it's already powered up since the screen lights for a sec and goes dark over and over every few seconds. The red light in front blinks 6 times then pauses then 6 times again over and over. On the first blink the screen lights then turns darker, then on the third or fourth blink it turns complete black.
This is what I have tried so far and the voltages I'm getting...
Power Supply to Mainboard connector
Pin 1 STBY = 5.330V
Pin 2 PS_ON = 0.053 and jumps up then back down (Pressing of the power button has no affect)
Pin 3 GND
Pin 4 B15V = 15.55V and jumps down to the meeter displaying 0L then back up to 15.55V does this every few seconds.
Pin 5 B15V = 15.55V and jumps down to the meeter displaying 0L then back up to 15.55V does this every few seconds.
Pin 6 B15V = 15.55V and jumps down to the meeter displaying 0L then back up to 15.55V does this every few seconds.
Pin 7 GND
Pin 8 GND
Pin 9 B5V = 5.316V and jumps to 0 and back to 5.316V (Does this constantly every few seconds)
Pin 10 B5V = 5.316V and jumps to 0 and back to 5.316V (Does this constantly every few seconds)
CN802 (Goes from power supply to X-Buffer board)
Pin 1 GND
Pin 2 PS-ON = 0.052 jumps up to 3. Something and back down to 0.052V does this constantly every few seconds ( Pressing power button has no affect)
Pin 3 VS CON = 2.077V and down to nothing constantly every few seconds
Pin 4 VS ON = 3.265V and every few seconds drops to nothing then comes back up constantly does this.
Pin 5 GND
Pin 6 B5V = 5.312V and drops down every few seconds then comes back up.
Pin 7 B15V = 15.56V and drops to the meeter saying 0L then back up constantly doing this every few seconds.
Pin 8 GND
Pin 9 VA = 58.13V and drops to 51V constantly every few seconds doing this
Pin 10 NC
Pin 11 VS = 210.2V and drops to 201V and back up constantly doing this every few seconds
Pin 12 VS = 210.2V and drops to 201V and back up constantly doing this every few seconds
CN4002 (Connector from X-Buffer board to the Y-Main board)
Pin 1 15V = 15.56V and drops to 0L then comes back up contantly doing this every few seconds.
Pin 2 DGND
Pin 3 OUTL = 20.23V then goes to 0L on the meeter then jumps up to 28.61V then comes back down to 20.23V constantly does this up and down every few seconds
Pin 4 OUTL = 20.23V then goes to 0L on the meeter then jumps up to 28.61V then comes back down to 20.23V constantly does this up and down every few seconds
Pin 5 OUTL = 20.23V then goes to 0L on the meeter then jumps up to 28.61V then comes back down to 20.23V constantly does this up and down every few seconds
Pin 6 VS = 210.2V then drops to 199V and comes back up constantly doing this.
On back of panel Vs says 210V I get 210.2V and drops to 199V and comes back up constantly doing this.
On back of panel Va says 58V I get 58.10 and drops down to 50V and comes back up constantly doing this.
On back of panel Vsc says -185 I get -184.9 then it jumps up to -192.7 and comes back down it does this constantly every few seconds.
Tried disconnecting the power from the power supply to each board individually to see if I could narrow it down but it eaither did the same thing or it would be completely dead.
Re-seated all cables with same results.
No bulged caps on any of the boards.
All fuses test ok even the pico on the main logic control board.
The heart blink on the main logic control board seems normal until the screen lights then it looks like it double beats then goes back to normal. What's odd is the heartbeat starts imediatly when plugging it in. I don't recall other samy plasmas doing this until you actually press power, pressing power does nothing it's like it automatically turns itself on when I plug it in.
I have attached a picture of the power supply. Does Anyone have any idea which board is the issue here?
This is what I have tried so far and the voltages I'm getting...
Power Supply to Mainboard connector
Pin 1 STBY = 5.330V
Pin 2 PS_ON = 0.053 and jumps up then back down (Pressing of the power button has no affect)
Pin 3 GND
Pin 4 B15V = 15.55V and jumps down to the meeter displaying 0L then back up to 15.55V does this every few seconds.
Pin 5 B15V = 15.55V and jumps down to the meeter displaying 0L then back up to 15.55V does this every few seconds.
Pin 6 B15V = 15.55V and jumps down to the meeter displaying 0L then back up to 15.55V does this every few seconds.
Pin 7 GND
Pin 8 GND
Pin 9 B5V = 5.316V and jumps to 0 and back to 5.316V (Does this constantly every few seconds)
Pin 10 B5V = 5.316V and jumps to 0 and back to 5.316V (Does this constantly every few seconds)
CN802 (Goes from power supply to X-Buffer board)
Pin 1 GND
Pin 2 PS-ON = 0.052 jumps up to 3. Something and back down to 0.052V does this constantly every few seconds ( Pressing power button has no affect)
Pin 3 VS CON = 2.077V and down to nothing constantly every few seconds
Pin 4 VS ON = 3.265V and every few seconds drops to nothing then comes back up constantly does this.
Pin 5 GND
Pin 6 B5V = 5.312V and drops down every few seconds then comes back up.
Pin 7 B15V = 15.56V and drops to the meeter saying 0L then back up constantly doing this every few seconds.
Pin 8 GND
Pin 9 VA = 58.13V and drops to 51V constantly every few seconds doing this
Pin 10 NC
Pin 11 VS = 210.2V and drops to 201V and back up constantly doing this every few seconds
Pin 12 VS = 210.2V and drops to 201V and back up constantly doing this every few seconds
CN4002 (Connector from X-Buffer board to the Y-Main board)
Pin 1 15V = 15.56V and drops to 0L then comes back up contantly doing this every few seconds.
Pin 2 DGND
Pin 3 OUTL = 20.23V then goes to 0L on the meeter then jumps up to 28.61V then comes back down to 20.23V constantly does this up and down every few seconds
Pin 4 OUTL = 20.23V then goes to 0L on the meeter then jumps up to 28.61V then comes back down to 20.23V constantly does this up and down every few seconds
Pin 5 OUTL = 20.23V then goes to 0L on the meeter then jumps up to 28.61V then comes back down to 20.23V constantly does this up and down every few seconds
Pin 6 VS = 210.2V then drops to 199V and comes back up constantly doing this.
On back of panel Vs says 210V I get 210.2V and drops to 199V and comes back up constantly doing this.
On back of panel Va says 58V I get 58.10 and drops down to 50V and comes back up constantly doing this.
On back of panel Vsc says -185 I get -184.9 then it jumps up to -192.7 and comes back down it does this constantly every few seconds.
Tried disconnecting the power from the power supply to each board individually to see if I could narrow it down but it eaither did the same thing or it would be completely dead.
Re-seated all cables with same results.
No bulged caps on any of the boards.
All fuses test ok even the pico on the main logic control board.
The heart blink on the main logic control board seems normal until the screen lights then it looks like it double beats then goes back to normal. What's odd is the heartbeat starts imediatly when plugging it in. I don't recall other samy plasmas doing this until you actually press power, pressing power does nothing it's like it automatically turns itself on when I plug it in.
I have attached a picture of the power supply. Does Anyone have any idea which board is the issue here?
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