Forum > LCD TV forum
Panasonic TH-L50B6D LED 1 Blink Code
BookWormStud:
--- Quote from: downunder on August 22, 2017,03:55:04 ---Hi, starting to make more sense, now. So SOS (danger) signal. Various sections of the TV are monitored for abnormal activity or operation. In such a case
an error signal is fed to the microprocessor on the A-board which usually reacts by shutting the set down and issuing a relevant error code by flashing the
standby light in a certain sequence. So BL-SOS tells the micro that there's a problem in the backlight circuits.
Theoretically, unplugging LD3, then LD1, would mean the problem is with the LD-board, but with LEDs disconnected, the micro can still sense
something's still not right.
Did you see Jordan's post re backlight damage in this model. I would expect BL-SOS to be near zero volts in a normally operating TV. Why not see what
happens if you run any BL-SOS pin to earth via a shorting link. Also, have you seen this bulletin. 45 days ex China is a bit ridiculous - I see, free
delivery. Must be sending by sea mail. We usually get stuff within 14 days by economy air mail. Bruce
--- End quote ---
1. OK Please elaborate this "Why not see what happens if you run any BL-SOS pin to earth via a shorting link.", How do I ground BL_SOS? (I'm a Noob :p)
2. Secondly about LED tester if I choose the DHL Shipping its costs like $25 more (6-13 Days). But that's not it, Custom Import charges are like 30-50 % of the price of product.
3. I checked those SMD FET Transistors. I checked them in circuit with my DMM at continuity test. Sometimes there's brief(like 1/2 second) beep sound when Drain & Source are probed, after that it shows a reading of 436. Otherwise they seem fine. I'm not that good at soldering but I'll ask someone to replace them with new ones.
4. Also I found this. His problem was same like mine But in his case voltages are different than mine.
downunder:
OK, see what you mean about the LED Tester. Perhaps Turnip will enlighten you about where he sourced his tester from - I don't think he paid anything like that for his.
Forget about the FETs -they measure OK. Re the Badcaps post, I don't find anything useful there.
The BL-SOS pin should, I expect, measure virtually 0V in a normally operating TV. So, to simulate the 0V status, you would use a piece of wire and connect it between the the BL-SOS pin and the main metal chassis, or use some sharp tweezers to connect between the BL-SOS
pin and any earth (=ground) pin on the exposed top of P2. Just interested if this stabilises the backlights. Bruce
BookWormStud:
Like this
kennyc:
Hello . When I am checking the LED strips I just use 2 transformers from the Xmas tree lights . You know the one that plugs into the wall and lights them . One has 12V output and the other 24V . If you are testing 8 LEDs use the 24V supply and if its 2 sets of 4 with a joinig cable betweeen them use the 12V one. I know its a bit basic but if its just to see if they all light or some are duff its a simple and easy way to do it
rshankarvi:
I think you should use this link where you will get best solution with step by step.
http://lcdrepair.co.in/
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version