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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Toshiba 40l1333b (SSL400_05DA) - backlight problem



New User

Nov 7, 2018, 7:51 PM

Post #1 of 2 (234 views)
Toshiba 40l1333b (SSL400_05DA) - backlight problem Can't Post

I have a Toshiba 40l1333b with a backlight 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.

Any clues which component on the led driver board in faulty?

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

correct voltages on SSL400_05DA

results of testing original SSL400_05DA (from the tv)

results of testing replacement SSL400_05DA

results of testing SN358, TR10E and CN001 - original SSL400_05DA

results of testing SN358, TR10E and CN001 - replacement SSL400_05DA

New User

Nov 8, 2018, 7:36 PM

Post #2 of 2 (220 views)
Re: [dfear] Toshiba 40l1333b (SSL400_05DA) - backlight problem [In reply to] Can't Post

I have fixed the backlight broken on this TV.

The problem was the crappy connectors that connect the led strip pairs together.

I have soldered solid copper wire jumpers between the pairs of led strips. Only one connection was faulty but I put copper jumper wires between all of the led strip pairs, on both the positive and negative connections.

The voltage on the LED tester (after the repair), when putting the probes on the IS and V_OUT test points on SSL400_05DA, was 124V.

I used the solid copper wire from 1.0mm2 twin and earth electrical cable to make the jumper links.

(This post was edited by dfear on Nov 8, 2018, 7:45 PM)


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