TV Forums

Free Games Games Forums Music Forums TV Forums

  Main Index FORUM
HOME
Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN
Rules & FAQ RULES
F.A.Q.

TV Forums: TV Equipment: TV Repair Forum:
Diagnosing backlight issue on a TCL 55s405

 



munruh15
New User

Sep 14, 2021, 6:29 PM

Post #1 of 2 (275 views)
Shortcut
Diagnosing backlight issue on a TCL 55s405 Can't Post

Hey everyone,

I have a TCL 55s405 that just had the backlight stop functioning over the weekend. The unit still powers on, still produces sound when pressing buttons on the remote, and using a flashlight on the screen allows me to see that the menu is being displayed, so I'm confident that it is just the backlight that is the issue.

I have opened it up and tested voltage to the LEDs from the powerboard, and think I have determined that it is an issue with that board, but wanted to make sure before I start dumping money into parts. There are 4 wires connected on the 10 pin connector and the voltage I get on the 4 pins with wires are as follows:

Pin 9- Top wire (black) - .7V
Pin 7- Second wire (red) 0V
Pin 4- Third wire (white) 0V
Pin 2- Bottom wire (red) 0V

Pins 7 & 9 are one circuit and Pins 2 & 4 are another. Considering that I'm getting different results from each of the circuits, and no voltage at all on one of them, I figure something is definitely wrong there. Am I safe assuming that the power board is the issue or are there further tests I can do to confirm that?

Thanks for any help or recommendations you can give me!


(This post was edited by munruh15 on Sep 14, 2021, 8:01 PM)



extremetvparts
New User

Oct 28, 2021, 10:44 AM

Post #2 of 2 (132 views)
Shortcut
Re: [munruh15] Diagnosing backlight issue on a TCL 55s405 [In reply to] Can't Post

Hi mate
sounds like your backlights not the boards as they cut off power when it find a fault thats why there is no power on the board to find out more contact this bloke he's great and helps everyone...


https://www.ebay.com.au/str/extremetvparts

https://sites.google.com/view/extreme-tv-parts/home?authuser=0

 
 


Search? for (options) Web Design by Web Ideas - Page loaded in: 0.18 s on (CGI/1.1)