Aspire 5535 LCD problem

Hi all,

I have been at this problem for a couple of weeks on and off. I have searched this forum for problems relating to this issue with this laptop model and I have not found anything. I have also searched for the same issue on other laptop models in case I can glean some knowledge that will help me fix this problem. Googling has not thrown any helpful results either.

On a positive note I can see by the helpful responses that there are a lot of very knowledgeable members here, so hopefully I can get this issue fixed.

Acer Aspire 5535-723G25Mn (MS2254)

The LCD on this laptop was not coming on when the lid was opened. This was initially an intermittent problem that could be rectified by opening and closing the lid several times.

The laptop works fine with an external monitor.

I would expect his sort of a problem would normally be due to a defective lid sensor but I have not been able to locate such a sensor on this model of laptop. There does not appear to be a mechanical switch nor any kind of magnetic switch.

The screen has since taken a bit of bashing (not me – honest! It's not my laptop) and as such needed to be replaced due to a few large cracks. So, I have fitted a replacement LCD This was a converted LED from ebay (item number: 120693215178) instead of the CCFL backlight that originally came with the laptop. I have also replaced the FPC cable in case it was worn by the hinge.

I have just contacted the ebay seller in case the replacement LCD is defective.

Assuming it is not the LCD hat else could be the problem here?

Any help would be greatly appreciated.

Regards

Blain

Thank you very much for your assistance.

i can't see anything in the seller's descroption regarding a dip switch...

but anyway that diagram above is great help.

I will look at this as soon as i get some spare time.

Thanks.
 

Well, I had time to take a look at it this morning. The photo above is of the LED board. I scoured it and the mainboard for a switch labeled U1. i couldn't find anything. there are 2 boards on this laptop this, and the mainboard

On the LED board there are the following buttons: Wireless, Vol + and -, and bluetooth (although there is no bluetooth module fitted).

On the mainboard we have Acer 'e' button, power and the left and right track pad buttons.

I'm stumped...

It is, yes.

Thanks.

Once again, thanks for your help.

The service manual I've been using for reference shows some differences to this laptop too.

it's mostly the same but a few things are different here and there. i put the difference down to being different revisions of the model.

Just for reference in the manual the mainboard has an enclosed cutout for the heatsink and fan but on this laptop it is open on the end, so the cutout is more of an extended semi circular shape.

HTH
 

Here is the service manual I've been using...

http://tim.id.au/laptops/acer/aspire%205535%205235.pdf

This is the only one I've been able to find during all my searches but there are some differences.

e.g. the layout of the speakers is different in this manual. there is no mention of any lid sensor or switch for the LCD and some of the screw placement are different.

Thanks.

This is from a 5315.

This laptop was detecting the lid closed when it had no LCD present - a problem for the owner because he had it fitted in his car...

originally from here

My partner's 5535 doesn't seem to detect that the lid has been opened. I have tired taping around the hinges in the same manner but I didn't have any electrical tape so i used duck tape instead. It mad no difference at all

The OP then goes on to state:

Any ideas if he is right and whether I could retape it with electrical tape. Would it make any difference?

What other systems do thet laptop manufacturers use to detect the lid?

Once again any help is appreciated.

Thanks.

I taped it in the same manner as the pic but I didn't have any electrical tape so i used clear duck tape. I don't know whether the duck tape provides enough insulation so i wondered whether applying electrical tape would make any difference at all. I initially put the tape on the foil so that the foil does not come into contact with the hinges at all.

I can't see anything on the 5535 that is magnetic other than the speakers. I've run a paper clip all around the upper plastics and found nothing. there are no wires in contact with the hinges that could provide an electromagnetic current. The only wires passing the through the hinges are the usual LCD cables and wireless antennas.

If the hinges were magnetic (which I don't think they are) what would they come into proximity to in order to trigger the LCD to turn off? The upper plastics of the bottom case are just that - plastic. There's nothing in there that I can see that could send a signal to the LCD.

in a nutshell I've stripped the laptop down several times and there doesn't seem to be anything in there that could act as a sensor or switch for the LCD

Thanks

Thanks for the link

I'll take a look now