I was wondering if anyone else has come across this problem. What was the problem?, and was it solved. I recently picked up 2 of these tvs and both initially diagnosed as bad backlights. When turned on, the backlights flash the red logo screen. Sound and an image is clear using a flashlight. So I buy 2 sets of leds. When they arrive I take one tv apart and test the leds before removing them. OMG they all work. but I put the new ones in anyway. So I think its the power supply. I swap PS from one to the other and same results. Now here is the issue and really confused me. I reset the tv using the reset button on the main board. Tv went into recovery mode. Backlights are on and stay on while I go through all the steps. Tvs says updating and I think its done. Tv restarts, I get picture, sound and backlights like normal, then backlights shut down. I'm back to original issue. Need help or explanation of whats happening. TIA
TCL 43S431 Backlight issue or Power Supply
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I have same problen with one like you ... don't think it is your power supply or your leds either. I picked up a free TCL 43S446 get standby light and works without backlights turning on ... but no power to leds. Ordered another power supply and was garbage didn't even get any standby light .. so put original back in. Than went and ordered a LED replacement strip .. same thing as original .. and still no backlight on power tv on. At this point It has be something like bad circuit on the panel. I have not went back to it yet. I think all these models are suffering from the same flaw.
Power Supply: 08-L12CLJ1-PW200AA
Know Models:
43S434
43S435
43S433
43S446
43S431
IPS Panel: T430QVN03.M
Main Board: TCL 30800-000328 - 40-R51MTA-MAA2HG; 11602-500227
No T-Con BoardComment
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the red socket which it go to Mainboards .. here are the BL_ON and power _ON... search on yours Power boards you will find Print Chart describe this socket wiring by Number and name , if the chart not on top look at the downside of the boards...
you should 100% sure of the Pins location., other wise you could damage the PSUComment
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So I tried to get the backlights to turn on by jumping the 2 pins with a 1kR. The P_ON and the Bl_ON pins are charted on the back of the Mb. When turned on, the logo screen appears for 15 seconds (I timed it) and then the backlights go out. No backlights but sound and image still present. I also think the problem is with the main board not sending the signal after initial startup. There are a few MB on Ebay for less than $25, so I'll try one.Comment
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So I tried to get the backlights to turn on by jumping the 2 pins with a 1kR. The P_ON and the Bl_ON pins are charted on the back of the Mb. When turned on, the logo screen appears for 15 seconds (I timed it) and then the backlights go out. No backlights but sound and image still present. I also think the problem is with the main board not sending the signal after initial startup. There are a few MB on Ebay for less than $25, so I'll try one.Comment
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some things wrong you did... maybe you jumber other one.. no reason to stay on 15 seconds unless the LED defect
show us the print chart of the socket on power boards
also with reference TV Chassis measure the red wire of LED+ at time you plug the tv in wall... mark the high and low V you will haveComment
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It was the power supply. I bought a repair kit from ShopJimmy ( $38) which included the main board, PSU and T con. 1st tv fired right up and stayed on. I put the original MB back in and tv turned on and everything is ok. I repeated this on the 2nd tv and the results were the same. Unfortunately, the second screen had a vertical line down the right side. So out of 2 free tvs, I got one to work for 38 bucks.Comment
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So I finally got around to 3 of these TCL 43S446-CA tv's I had picked up for free over the past year. People were dumping them. Seems these models all have cheap power supply problems with diodes. After wasting 20 bucks on a Power Supply: 08-L12CLJ1-PW200AA that was sent to me and was garbage I saw a video on youtube that was similar ... showing the bad diodes beside the backlight plug that were likely the problem. Like handsworth said all it is is the power supplies. I bought 20 SB540 diodes for 4.00 and replaced 1 SB540 diode on all 3 power supplies and now all 3 tv's work lol
One of the tv screens has an issue though ... does not look like burnt pixels but more like bad integrated t-con on mainboard or maybe bad screen? Anyone have any thoughts before I tinker with it? You can see near top left a square black block, and near bottom right same thing a black block. The rest of the screen is ok. I've tried to add the best pics I could of the screen on. Any tips appreciated Thanks allComment
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