Acer AL718: It Goes On And Off
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Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740 -
Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Acer AL718: It Goes On And Off
Something else to try : In the brief period it flashes on turn the brightness right down and see if it stays on any longer.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Acer AL718: It Goes On And Off
nick i know pulling the light bulbs out is an hard work but from your picture 4 - post #35 i see a little darkened end that seems outside the glass, if you read well i have told to leave the little white rubber to see the terminals, them can be burnt / desoldered.Comment
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Re: Acer AL718: It Goes On And Off
Ii'have put a'movie on youtube of the the tubes.
http://www.youtube.com/watch?v=UJrk1...ature=youtu.beComment
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Re: Acer AL718: It Goes On And Off
While measering the voltages,I have made a' shorting and now is the board dead,the main
fuse is still okay but the others i' dont know where they are located,while measering
the 5V I did see that It wash 5.2V and verry unstable ,so maybe badcaps then.
But first I'll have to get it back to live.Comment
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Re: Acer AL718: It Goes On And Off
"While measering the voltages,I have made a' shorting"
Hi nick, these sort of things happens quite a lot of times and i do them too :-(
so keep in mind that if you are unsure of the touch of the probes and them slides away don't do the measurement or try a different method like masking with tape all possible near obstacles (pins). Now it's useful if you post a picture with a mark where did you make the short; for the lamp i have handled them only 1 time in life and i've found impossible to slide the rubber along the wires 'cause them are siliconic or "matted skin", the only way is to slide it on the lamps themselves very slowly taking the lamp with 2 fingers near the end where the rubber to move is..Last edited by Davi.p; 12-03-2013, 01:07 PM.Comment
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Re: Acer AL718: It Goes On And Off
Nick i'm not so an expert, i think that if you want to eliminate possible causes you have to check the integrity of the soldering of the tube terminals, i don't have your lamps in hand and i can't feel how much fragile them are, i have done this on mine very carefully and nothing crash has happened; about the testing area, were you testing that with band wirecable connected to the each board? If so i think the damage is now on the main logic card. Test the power supply board detached from the rest and see if there are the output voltages.Comment
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Re: Acer AL718: It Goes On And Off
The tubes are about 2mm diam,so they are very fragiel,but will atempt to get closser in
to solders.
At the time off shorting the Logic bord was not connected,so fault must still in the power
board,I'll suspect there must be some fuse around that area.Comment
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Re: Acer AL718: It Goes On And Off
Ok - You need to start again- forget the lamps for now. I can show you later a thread on how to make a test lamp.
Power off
1 Test the the main fuse - near the mains input socket - meter on ohms200
probe each end of fuse - should be same as holding the probes together.
2. If fuse is good
POWER ON - High voltage test so very careful.
Meter on 600vDC put one probe on each end of BIG cap.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Acer AL718: It Goes On And Off
Nick i'm sorry for you but there isn't clearly any fuse on the secondary from your pictures.
after the selldoor's test, test newly all outputs in the same connector you circled but now put your elbows on a steady plane and if you want mask other solderings with tape or measure on the connector not on solderings, by putting a short piece of wire (not cable, like a resister terminal) in each hole of it... i think you won't find any V. If so test the main switching mosfet , from your first picture is the lowest chip with 3 legs on the smaller heatsink, test in diode mode, it must not read approx 0,00 in any combination. BYE!Comment
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Re: Acer AL718: It Goes On And Off
Nick i'm sorry for you but there isn't clearly any fuse on the secondary from your pictures.
after the selldoor's test, test newly all outputs in the same connector you circled but now put your elbows on a steady plane and if you want mask other solderings with tape or measure on the connector not on solderings, by putting a short piece of wire (not cable, like a resister terminal) in each hole of it... i think you won't find any V. If so test the main switching mosfet , from your first picture is the lowest chip with 3 legs on the smaller heatsink, test in diode mode, it must not read approx 0,00 in any combination. BYE!
leg noting at all .
Will fabricate some small wire's on the testing area,so i'wont short it again
while testing.
Last edited by nick2012; 12-06-2013, 04:47 PM.Comment
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