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I rescued a 17" Sony SDM-S74 TFT from a WEEE bin. It powered up ok and displayed an image, but the screen went black after about 2 seconds. So I dismantled it and had a look around.


 

 I wanted to know whether it was just a problem with the backlight, or something more complicated involving the display driver.

There are two boards inside - the one on the left provides four HV supplies for the CCFL tubes and logic rails for the other board. The other board takes in VGA and DVI and drives the display panel.

The HV supplies turned off with the display after a couple of seconds, so it was impossible to tell whether it was the problem. or just a side-effect. Shining a torch on it didn't reveal anything. I happened to have a spare CCFL driver left over from a scanner I dismantled a while back, so I hooked it up to one of the tubes. Sure enough the display lit up dimly to reveal a perfect image - proving it to be a fault on the power board.  The CCFL driver can be seen in the centre of the photo:

I looked around the power board. There was an interesting chip labelled BA9741F. I looked it up and found a datasheet. This is fairly unusual - for some reason you usually get one of those annoying sites that just list chip names or, even worse, one that tries to charge you for datasheets. I had a poke around with the scope and found that the voltage on pin 15 of the chip ramped up until the backlight turned off. The datasheet is pretty appalling, but this seems to be to do with some kind of short circuit protection that turns the supply off once its output has been shorted for some period of time.

I  checked the outputs and they were not shorted, so I figured something must be wrong with this short circuit detection. The pin was connected to an external capacitor which it charged up. So I went for a really nasty hack... and replaced the capacitor with a 2.7k resistor!

The display works!

I've been using it for a good few weeks now and it hasn't caught fire, so I think I made the right call. Still feel a bit dirty, though, should probably have got a replacement chip, or otherwise probed deeper into the matter. 

categories [ ]

Warranty Void if Removed | Collected technological projects

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Wow! This fixed my 17 inch

Wow! This fixed my 17 inch LCD.

Thanks

15" wipor lcd monitor

wipro monitor 15" nodisplay ammber light comes and not getting off. but powerboard electrolight capecitor ok. what is the proplem..

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Another one working

Another CTX PV720 fixed. Now working for an hour with 2K2 resistor.
Thx a lot, now I can reuse my old 17" after some months useless.

Greetings from Spain.

Glad your monitor is

Glad your monitor is working; thanks for the post!

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This helped fix my monitor!

My lenovo 6135 had the same problem! Its a nice 1280x1024 manufactured in july 06, saw fairly little use in its first life as the monitor for a security system comp. I was sad when it crapped out on me a month ago (got it free), and I couldn't find any issues with the backlight itself.

After reading this article, I cracked it open and found a similar IC, the TL1451A. After looking up the datasheet, I found out how to disable the short circuit protection. (same thing, resistor across the lytic near the chip) At first a 3k resistor didn't work, but a 500ohm did. Totally shorting the cap also works.

As far as how long it'll hold out, I don't see any reason this wont work forever. I can remove the resistor or short once the monitor has powered up and is steady state, and it stays on fine. So basically overload protection is only when the tube is first firing up, probably due to slight aging and higher current draw. As a result, the IC is only being overloaded as it trys to power up, and trips.

I have a 3M microtouch monitor with this problem, I bet I can apply this solution there as well!

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i try your way to change cap with resistor and really works.. nice hack... thank you for your post...

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I have the same problem with a Phillips 17inch monitor. I will try what you mentioned here. It would be cool if I can actually get it up an running again.
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i googled and found your

i googled and found your page! thanks! replaced the cap with a 4,7k resistor and the screen worked, but the transistors i replaced got really hot, so i checked the transformer and i noticed that the other transformer hat about 200 ohms more resistance => fail
I looked in my electronik rest box an found an inverter of an 15" screen so the transformer was smaller but i just soldered wires on to fit in the PCB.

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