I too dissassembled and found nothing burnt etc. - also have 5 volts (approx) on 'PS ON" line (brown wire). i found simialr schematic and this line turns on/off an LED in an opto coupler which then turns on/off the power supply main outputs. These outputs are all on (5v, 12v etc.) and yet nothing from sound or screen. Very strange. Is there a reset circuit at fault? If TV powers up in this state, perhaps all logic needs a reset?
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
SOURCE: Acer AL2671W stuck in standby
This too was my problem... ended up googling my heart out trying to find the solution to this problem and found a blog posting
"AL2671W Stuck in Standby Hey - I fixed a TV! It' s been a long time actually since I did something useful for someone. I got asked to look at an Acer AL2671W LCD TV. Bought for about £500 five years ago, and that was cheap then, recently it has regularly refused to come out of standby. Now it is stuck in Standby and won't work. So where do you start? Google of course! Some results showed that this was a common fault on these TV's. One guy in a forum said 'easy fix, replace C280 100uF 16V on the main board'. Good enough of a clue to take a look. You have to firstly remove the SCART socket block before the back will come off and then the inner metal cover over the PSU, audio card and main card as mentioned before. It looks just like a mini ATX card. It is a multi layer, double sided PEC with surface mount and traditional components. Bad news though, no C280 to be found. I buzzed through the front power switch to check it wasn't stuck and traced the cabling to the socket on the main board. Very close by the socket is C380, this is an electrolytic 100uF 16V. Too much of a coincidence? Anyway worth a punt I thought so I changed it for an 100uF 40V I think it was and re-assembled the TV. It worked! the TV now comes out of standby and has been returned to its owners. Result! Posted by andychamb"
I end up finding an old ATI card (since it was unsupported with win7) that had the same value capacitor and replaced C380, located around the centre, bottom left corner (the left one). works like a dream.
SOURCE: My AL2671W swit5ches off the backlight before the
I read many postings on this matter and found the solution. Thanks for following up. Kind regards Hans
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