TFT Repair

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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. 

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ctx pv720 BA9741F / display goes blank after 2sec.

Follow-up from report on 06/06/2008. The display is still working great...

Good fix
Thank you again for the posting.
From:
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Thanks

Had the same prob with my 17" prolite E431S screen, first i replaced the caps => still the same, then i replaced the transitors of the one inverter because the were dead. After that the screen still turned black after 5 sec. then 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.
And now it's working fine for almost 3 hours :D
Will see how long it lasts.
Tank you very much
Greetings from Bavaria

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Fixed my Philips 170B2T

Hi,

Thanks for sharing this information.
I just managed to fix a Philips 170B2 with the same problem which has the same BA9741F IC on the inverter board.
I did a quick check of the voltage on the capacitor connected between pin 15 and 16 and it was indeed rising until the panel backlight went off.
I replaced the capacitor with a 2,7k resistor and the backlight stayed on.
The screen was in operation for 40 minutes now and is still working.
I wonder how long the hacked monitor will work though.

Cheers,
Markus

15" AOC LM525

Got this given cos it turned off after blinking a few times - anyone know what could cause this? Have pulled it apart and nothing unusual - all diodes look good, caps and res's look ok....

I've got a Philips 170B2T

I've got a Philips 170B2T which is doing the same thing (back light goes off after a few seconds). Anyone diagnosed the problem further, or have any suggestions on how to debug it? Has anyone had any problems with this fix? It seems pretty dirty and I was hoping to diagnose it some more.. :) Surely it's shutting down for a reason (something else is overheating maybe?)

Sam

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