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Panasonic TH-L50B6D LED 1 Blink Code
BookWormStud:
Hello,
Posted a problem on reddit & badcaps (O/G post) about Panasonic Viera TH-L50B6D.
TL;DR Backlights turning ON and OFF. LED screen is alright did the flash light test. After sometime TV goes to standby with Red Light Blinking. Reduced brightness, now TV stays ON but backlight turning ON & OFF.
[UPDATE] Someone on reddit provided me with the Service Manual (don't download I'll provide important images later) of TV almost similar to that of my TV. Only difference is Main/A-Board (that too in position of connections everything else is same).
Take a look at these:
Overall Schematic
Wiring Diagram
Block Diagram 1 A-Board
Block Diagram 2 Other Boards
Now I'm asking, Is there any way to jump the wires with A/Main-Board disconnected from P/Power Board and turn ON the backlights.
I read a post by downunder [Truly A HERO Member]Post
downunder
when I asked about the post he said he meant like this.
I don't know if same applies in my because someone on reddit suggested me to do it like this can anyone confirm
Thanks. Any other Info you need please comment.
downunder:
Your original symptoms were error code 1 - this is a backlight SOS.
Reduced brightness, now TV stays on but backlights flicker. That means POWER-ON signal is being supplied to the power supply from the A-board.
Check it - should be anywhere from 2V to 5V, DC and steady.
So there should be no need to link Power-On to the 5V Standby rail.
Merely link BL-ON pin to the 5V pin. Backlights OK, then A-board most likely faulty, but also check screen for any darker areas
which means some of the backlight LEDs are out. Bruce
BookWormStud:
I tried what you said nothing happens.
I also tried with POWER_ON pin connected still nothing. Check if this is correct
downunder:
OK, it looks like we're working on different variants of the P-board. The TH-P50B6A uses 13 pins on P2. The TH-P50B6Z uses 14 pins. Your block diagram 2/2 shows 13 pins. Your Overall diagram and your last post show 12 pins. Obviously the connections will all be different.
Your picture of the P-board shows no markings at the plug to say which pin does what. Have you checked the underside of the P-board to see if the pins are titled there?
If not, place the TV in standby and measure the pins on P2 for voltage. Only 1 pin will have volts, that's the Standby pin which will read about 5.3V. From there you'll have to work out Power-on pin and BL-ON pin. I'm starting to get as confused as you now. Bruce
BookWormStud:
--- Quote from: downunder on August 13, 2017,19:53:07 ---
OK, it looks like we're working on different variants of the P-board. The TH-P50B6A uses 13 pins on P2. The TH-P50B6Z uses 14 pins. Your block diagram 2/2 shows 13 pins. Your Overall diagram and your last post show 12 pins. Obviously the connections will all be different.
Your picture of the P-board shows no markings at the plug to say which pin does what. Have you checked the underside of the P-board to see if the pins are titled there?
If not, place the TV in standby and measure the pins on P2 for voltage. Only 1 pin will have volts, that's the Standby pin which will read about 5.3V. From there you'll have to work out Power-on pin and BL-ON pin. I'm starting to get as confused as you now. Bruce
--- End quote ---
I checked the Part No. of P-Boards on 2 Service Manual [TX-L50B6B & TX-L50B6E] they both have same No. TXN/P1ZPUE [TNPA5807 2P] as mine & they too show the same block diagram with 13 Pins as I have provided above but have 14 pins in reality. (Check Images)
Is there anyway to check which pins are BL_ON & POWER_ON by checking the voltages.
Why do we need a resistor? Can't we simply jump with a piece of wire?
I read a post on justanswer.com where they suggested to jump wires directly with single piece of wire, no resistor.
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