Hello,
Recently owned not working plasma TV. Screen was full of random pixels, opened and found 9 bad capacitors. Changed them and now TV just turns on and turns off, but stand-by led stays blue. Tried to disconect all plugs from PSU board, but the same problem. Even with disconected control plugs, PSU starts(relays works), couple seconds and relays(maybe one of them)shut off. Half second till relays disconects, VS and VA voltages goes up.
wixxwa
Member
Last Activity: 11-13-2011, 05:25 AM
Joined: 11-04-2011
Location: Lithuania
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LG 42PC1RR plasma turns on then off
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Re: Acer AL1916W monitor backlight turns on/off twice
I measured again LD1117AL33 and it has 3.28v, i think i made mistake, sorry for that.
All in all i think LCD panel is bad. But i dont have how to check it..
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Finally found the problem: connection between panel and mainboard was bad. cleaned contacts with concentrated vodka and bit pushed harded and it works. now everything OK.
Thanks a lot for help. -
Re: Acer AL1916W monitor backlight turns on/off twice
Where i should look for fuse? in both PCB i see only one fuse, near AC socket.
I checked all VCC pins of mainboard IC, everything OK.
I found one fuse in LCD, but everything is OK with him.. Checked VCC to LCD- OK too.....Leave a comment:
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Re: Acer AL1916W monitor backlight turns on/off twice
Legend Pluged Unpluged
1.VCC5v -- 5.12 -- 5.17
2.VCC5v -- 5.12 -- 5.17
3.GND
4.ON/OFF -- 0.04 -- 0.0 -- When monitor turning on there is 3.3v
5.Brightness -- 3.12 -- 0.0
6.GND
7.VOLUME -- 3.3 -- 0.0 -- (not used)
8.Audio MUTE -- 2.07 -- 0.0 -- (not used)
On mainboard there is two voltage regulators:
LD1117AL33 Pin3- 4.8v pin2-3.12 pin1- GND
AS1117L-18 Pin3- 3.18 pin2-1.78...Leave a comment:
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Re: Acer AL1916W monitor backlight turns on/off twice
Tried to unplug mainboard from LCD, PLED and backlight responds same.. No changes....Leave a comment:
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Re: Acer AL1916W monitor backlight turns on/off twice
[URL="http://youtu.be/uD-czYNO65s"]Link[/URL] to video i filmed right now. When backlight flashes two times, lcd goes to stand-by mode. Nothing more happens. I can turn off lcd and turn on, still the same problem.Re: Acer AL1916W monitor backlight turns on/off twice
[URL="http://youtu.be/uD-czYNO65s"]Link[/URL] to video i filmed right now. When backlight flashes two times, lcd goes to stand-by mode. Nothing more happens. I can turn off lcd and turn on, still the same problem.Re: Acer AL1916WLeave a comment:
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Acer AL1916W monitor backlight turns on/off twice
Hello,
I'm new in this forums and this is my first post.
I have Acer AL1916W monitor that comes on/off twice(only backlight), led turns green and then orange. No Acer logo, just white screen. What can be wrong?
All caps looks good....
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