Acer X193w 2 secs to black & no picture

[piernov]

I was given this Acer X193w as "dead".
Indeed, first time I tested it, I got a 2 seconds to black issue (repeated 2 times) with some buzzing noise. Probably a bad CCFL/connection.
I took it apart and first thing I observed is that I wasn't the first one in there.

I noticed that the LVDS FFC had been messed with too, and in fact it was broken at the end of the motherboard's side connector. I removed it from the connector, cut the end of it, sanded the "new" end, cleaned it up and plugged it back in. I made sure every pin was making contact from the panel's side connector (this end is good) to the motherboard's connector pins.

After playing with the CCFL connectors, I got it to stay on for more than a couple of seconds, even though the noise was still there and the backlight was flickering.
I connected it to the computer and… everything was staying black, even though I had a faint backlight.

Well, I guess the broken cable did damage something else. I tried the panel on another display and it works ok (without backlight though).

I'm going to first replace the cable with a new one, then I'll go for the mainboard. And if I manage to get an image, I'll try to disassemble the panel to fix the backlight.

[piernov]

Re: Acer X193w 2 secs to black & no picture

So indeed the no image issue was caused by the cable. With a new cable the image is there. The cable I ordered: "Double 8 Different Face 30P High-quality Buckle FFC Soft Cable LVDS Interface 30PIN Screen Brand Machine Original Screen Line" → https://fr.aliexpress.com/item/Doubl...808549979.html


About the backlight issue, I guess I've got 2 defective CCFL at the bottom. When I disconnect them, the buzzing/fllickering stops. When I connect the 2 bottom CCFL on the 2 top connectors, the buzzing/flickering is there. When I swap one bottom and one top CCFL, the buzzing/flickering stops (though there is still a small high-freq noise). I guess having 2 defective CCFL loads up the bottom circuitry, when the additional load is shared between top and bottom circuitry it's somewhat ok.