Re: Benq t720 - 0 seconds to black
I tried to turn it on again (with PC connected). Something is not right. If I remember correctly, the Benq logo sould dissapear right away. It seems to me that its there for too long now.
Btw, its not perfectly visible on the video, but the second "flash" is brighter than the first one...
And after the second "flash" I think it's not displaying any image (from PC). I tried to shine a flashlight on it while moving notepad window (that worked before )
Well, I have here another...
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Re: Benq t720 - 0 seconds to black
Startup cap is the biggest one (150uF 450V)?...
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Re: Benq t720 - 0 seconds to black
It's not (pure) 2s-to-black. On the video top of the screen is brighter than it should be. I'am afraid to let it turned on for longer than seen on the video......
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Re: Benq t720 - 0 seconds to black
Not on the video, but it does [U]exactly[/U] the same with VGA connected.Re: Benq t720 - 0 seconds to black
Not on the video, but it does [U]exactly[/U] the same with VGA connected.Re: Benq t720 - 0 seconds to black
Not on the video, but it does [U]exactly[/U] the same with VGA connected....
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Re: Benq t720 - 0 seconds to black
I am back. I was at local store, but they had only 2A picofuse (or 5A) and i need 3A. So I bought the 2A and 3,15A (big) tube fuse as backup.
First I tried the 2A picofuse. Backlight worked for 1s and then the fuse blew up (yea, I was kind of expecting that, but at least I know the backlight works).
Then I soldered in the big 3,15A fuse. I know it's not ideal, but it worked perfectly! (well...for the first try). After I assembled everything back together it stoped working again...but with different symptoms:
...
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Re: Benq t720 - 0 seconds to black
Thanks guys, I couldn't find the fuse before Well, that may be the case. It definitely has more than 1 Ohm (out of range on multimeter). I guess it won't be easy to find replacement around here and I am afraid to just short it :-)
I'll try to find some tomorrow.....
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Re: Benq t720 - 0 seconds to black
Thanks for (quick) reply :-) I tried to resolder everything suspicious with no luck.
Acording to the 2s-to-black guide I :
- measured highlighted MOSFETs. Everything has more than 200 ohms.
- measured secondary windings on highlighted transformers. All four had 750 ohms.
Any other ideas?:-(
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Benq t720 - 0 seconds to black
Hello guys,
i have Benq T720 (for about 10 years) and it started to suffer from "2s to black"...well, it was more like 500ms to black. I had to turn off and on the display for about 30 times to stop blacking out. Then i found a "fix" - i lowered the brightness to minimum and it just worked®. But now, the display won't light up at all. It's still just the backlight issue - i can see the picture with flashlight.
I disassebled the LCD and found five 470uF and one 1000uF capacitors visually bad so i bought replacements and replaced them. But it didn't...
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