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service manual or schematic for ACER 1914 sm LCD screen 19&q
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Helpmeout
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PostPosted: Tue Aug 18, 2009 11:43 am    Post subject: service manual or schematic for ACER 1914 sm LCD screen 19&q Reply with quote

Hi all,

My LCD screen is an Acer AL1914 sm (not widescreen). It worked fine for 3 years (just got out of warranty) until now. The power-on LED doesn't turn on anymore and also no backlight, and just a black dead screen. I am sure that the display itself is still ok, meaning that the backlight is still ok, but it is something that has to do with the printed circuit boards. I opened my screen and the following boards are in it:
715L1142-3-AUE (=Power supply board)
715L1144-1-IO (=little board with 1 chip on it, i think it has something to do with turning on audio or backlight but i am not sure)
715L1237-1 (board to connect VGA cable)
I also have disconnected the power supply from the other boards and i measured 2 kinds of voltages : +5V that is stable, but then a voltage that is constantly moving between 10,5 - 11,6V that is not stable. I expected +12V normally there.
I also hear a little 'plopping' sound in my speakers every second.
I have a bachelor degree in electronics, so i know how to solder or replace components on a board.

Does anyone have a schematic or a service manual of one of these printed circuit boards ?
If so, please send it to [email protected] or place a link on this forum. If someone has simular problems or even have a possible solution for this problem, do not hesitate to respond Wink

Thanks in advance!
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Tue Aug 18, 2009 6:40 pm    Post subject: Reply with quote

Put you own 12 volts on "there" and see if it works. Electrolytics can still be bad but don't look bulged. Wink
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PatBoots
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PostPosted: Wed Aug 26, 2009 2:07 pm    Post subject: Acer lcds Reply with quote

Have you checked the elcos on the power supply board?
I had 3 Acer AL1921 where the elcos at C914 and C915 were blown out. After replacing them (about 0,7 US$ each), the lcds are running fine again.
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Helpmeout
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PostPosted: Thu Aug 27, 2009 3:07 pm    Post subject: Reply with quote

Hi folks,

I looked at my power supply board to the elco's, none of them are open, but I do indeed see 2 elco's (of 470µF) are lightly bulged. So i will start to replace these 2.

I will let you know what my results are on the 5th of september, if these replacements helped or not. Currently I'm busy with other things now, but on the 5th, I have time to do the soldering of this board.

Already thanks for your answers, keep them coming Smile

Thanks & greetings
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volegna



Joined: 18 Aug 2009
Posts: 5

PostPosted: Thu Aug 27, 2009 4:46 pm    Post subject: Reply with quote

Hi all,

Helpmeout again Wink
I registered as "volegna" now because then I can add 4 links to pictures I have made from my bad screen. (I accidentally got blacklisted as unregistered user 'Helpmeout' because I wanted to post 6 links to the pictures I have made of my bad screen, sorry for that, didn't know i could only post 1 link as an unregistered user Sad ).

Below, i uploaded some pictures of the boards for your interest. Please be patient because some pictures are large in size. Wink

Here are the links for the pictures:
http://img412.imageshack.us/img412/1527/img0308b.jpg
http://img106.imageshack.us/img106/7936/img0311j.jpg
http://img25.imageshack.us/img25/6730/img0309nod.jpg
http://img29.imageshack.us/img29/6495/img0310fqm.jpg

If you have comments or other helpful info, let me know Wink.

Talk to you folks later on the 5th of september.
Best greetings to you all.
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volegna



Joined: 18 Aug 2009
Posts: 5

PostPosted: Thu Aug 27, 2009 5:02 pm    Post subject: Reply with quote

Here is the last link:

http://img106.imageshack.us/img106/9411/img0312.jpg

Best regards,

volegna
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volegna



Joined: 18 Aug 2009
Posts: 5

PostPosted: Tue Sep 01, 2009 4:06 pm    Post subject: Screen fixed :D Reply with quote

Hi all, to be short : The screen is already fixed Very Happy

I couldn't resist to do some solderworks, so i already fixed the 1st of september instead of the 5th Very Happy .
PatBoots was exactly right Very Happy, elco's C914 and C915 were lightly bulged. They were 2 elco's from brand "Hermei" of 1000µF/16V/105°C. I replaced them with the same model but from another brand. Now the screen works like a charm Very Happy. I can turn power on and off with the button and i don't hear anymore 'plops' in my speakers. So problem is solved Very Happy.

I will test it alot now to be 100% sure but all seems ok. For me this thread may be closed.
Big thanks to PatBoots and jts1957 Very Happy. I fixed a screen of 325 euros (i'm from Belgium, so here it is in euro's Smile ) that i bought more than 3 years ago with replacement of 2 elco's that costed me only 0,66 euros.

Hope this response helps other people too Very Happy

Thanks all and best regards,

Volegna aka Helpmeout
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viole Falushe
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PostPosted: Wed Sep 09, 2009 9:24 pm    Post subject: that's correct ? Reply with quote

hi at all, I open my acer al1914 and i found the C904 and the C905 I mark that in the photo. are they correct? I will change it?

'Cause u write C915-4 but i dont found it


I wait a reply please
before there is http
img143.imageshack.us/img143/2285/acer1914.jpg


thank u soo much from italy
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Thu Sep 10, 2009 12:35 am    Post subject: Reply with quote

Look to the right of the larger part you circled - jump over two aluminum heat sinks - two blue caps. Shocked
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volegna



Joined: 18 Aug 2009
Posts: 5

PostPosted: Fri Sep 11, 2009 5:14 pm    Post subject: Reply with quote

Hi viole Falushe,

I have added a picture that shows the 2 capacitors that were bad from the powersupply. These 2 caps are really C914 and C915 from my powersupply. If you have the exactly same power supply like I have, then you should find them on your board. If it is another powersupplyboard you have, then post us a picture Wink

Anyway here is the picture that shows the 2 capacitors that needs to be replaced :
http://img29.imageshack.us/img29/66/locationbadcaps.jpg

Be aware : respect the polarity (+ & -) of the caps Smile

Good luck Smile

Please let us know if you have fixed it or not.

Best regards,

Volegna aka helpmeout
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