dfear
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Nov 7, 2018, 7:51 PM
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Toshiba 40l1333b (SSL400_05DA) - backlight problem
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I have a Toshiba 40l1333b with a backlight problem.
Problem:
The backlights don't light up.
Screen: Lta400hm23
LED Driver board: Ssl400 0d5a- Rev 1.0
Back light LED Strip connector board: SSL400_WP01 REV:0.0
Firstly I replaced the driver board, but that didn't fix the problem.
with the replacement driver board connected, I tested the led strips with an LED tester and all the leds light up.
I tested the leds using test points VOUT and IS (which are on the led driver board).
Also i have checked the continuity from the led driver board to the led strips, and continuity is OK.
I think there is a fault with the led driver board. I have attached two photos of the led driver board. The photo with just black test shows what the voltages should be at various points (i found these voltages from a photo I found on a forum). The second photo ( with the green text) show the results of testing the replacement driver board.
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Any clues which component on the led driver board in faulty?
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Update: I replaced the SN358 op-amp with with a LM358, but it made no difference.
Here is a number of photos with varying test results
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correct voltages on SSL400_05DA
http://testing.dfear.co.uk/...2-1.black%20text.png
results of testing original SSL400_05DA (from the tv)
http://testing.dfear.co.uk/...20test%20results.png
results of testing replacement SSL400_05DA
http://testing.dfear.co.uk/...20test%20results.png
results of testing SN358, TR10E and CN001 - original SSL400_05DA
http://testing.dfear.co.uk/...-%20ic%20results.png
results of testing SN358, TR10E and CN001 - replacement SSL400_05DA
http://testing.dfear.co.uk/...-%20ic%20results.png
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