Gateway FPD2485W - capacitor related?

[Wrog]

Re: Gateway FPD2485W - capacitor related?

Better, yes. But the focus should be on the caps and not the wiring. The way to do this (on many digital cameras): push down halfway on the button to focus, then move the camera to frame the rest of the picture. This will allow you to focus on anything and include anything surrounding that may help. That being said, I still can't tell if they are bulging but it does look at least a little like they are. If the tops are not completely flat, then it's time to replace them.

[djfourmoney]

Re: Gateway FPD2485W - capacitor related?

Here is how I take pictures for posting.

Take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focus pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

Here is an example of the pictures we want.

https://www.badcaps.net/forum/showpo...94&postcount=1

Better?

[retiredcaps]

Re: Gateway FPD2485W - capacitor related?

My point and shoot only goes up to HD (1080p, 1920x1200) that's has high as can go.

Here is how I take pictures for posting.

Take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focus pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

Here is an example of the pictures we want.

https://www.badcaps.net/forum/showpo...94&postcount=1

[seanc]

Re: Gateway FPD2485W - capacitor related?

My point and shoot only goes up to HD (1080p, 1920x1200) that's has high as can go.

That sounds adequate. Your previous pictures were 800x600.

[djfourmoney]

Re: Gateway FPD2485W - capacitor related?

In the circled red area, they sure look domed in the picture. If unsure, post clear focused pictures with a resolution as close to 2000x2000.

My point and shoot only goes up to HD (1080p, 1920x1200) that's has high as can go.

[Wrog]

Re: Gateway FPD2485W - capacitor related?

Is this the area your talking about?

Yes, exactly! As retiredcaps says, please post a higher resolution shot of this area (maybe the whole power supply board if you would please).

You mean the part that has the ribbon to the touch controls/power button?

I don't think the inverter board has the FFC to the touch controls, this should either be on the main board or the USB sub-board (I forget which on this model).

[retiredcaps]

Re: Gateway FPD2485W - capacitor related?

Is this the area your talking about?

In the circled red area, they sure look domed in the picture. If unsure, post clear focused pictures with a resolution as close to 2000x2000.

[djfourmoney]

Re: Gateway FPD2485W - capacitor related?

Your inverter pcb is to the right of your power supply board.

You mean the part that has the ribbon to the touch controls/power button?

[djfourmoney]

Re: Gateway FPD2485W - capacitor related?

I agree with Sean, those four in the lower left hand corner of your power supply pcb definitely look domed. Would need higher resolution shots to be sure though. Your inverter pcb is to the right of your power supply board.

Is this the area your talking about?

[retiredcaps]

Re: Gateway FPD2485W - capacitor related?

Here the pic -

Folks here prefer that you use the manage attachments versus inline pics.

See

https://www.badcaps.net/forum/showthread.php?t=1868

PS. It sure looks like you have bad swollen caps.

[Wrog]

Re: Gateway FPD2485W - capacitor related?

Unless it's a trick of the light, I see connect 4 on your power supply!
That's 4 bad capacitors....

I agree with Sean, those four in the lower left hand corner of your power supply pcb definitely look domed. Would need higher resolution shots to be sure though. Your inverter pcb is to the right of your power supply board.

[seanc]

Re: Gateway FPD2485W - capacitor related?

Unless it's a trick of the light, I see connect 4 on your power supply!
That's 4 bad capacitors....

[djfourmoney]

Re: Gateway FPD2485W - capacitor related?

I got the back off and took some pictures but they look like the others on page #3 there's no visible damage. No puffy Caps or any burn marks.

Where is the inverter located? Is it the other PCB board located under the alum sheet with two signal plugs coming from it?

I will post some pictures tomorrow during football, I have another race to watch at 7am. (FIA GT1)

Here the pic -

Raiders!

[djfourmoney]

Re: Gateway FPD2485W - capacitor related?

I got the back off and took some pictures but they look like the others on page #3 there's no visible damage. No puffy Caps or any burn marks.

Where is the inverter located? Is it the other PCB board located under the alum sheet with two signal plugs coming from it?

I will post some pictures tomorrow during football, I have another race to watch at 7am. (FIA GT1)

[retiredcaps]

Re: Gateway FPD2485W - capacitor related?

Do you think there is a way to find a different part, say from digikey that essentially does the same thing?

I suggest emailing digikey and asking them if they can suggest a replacement for the AP9985GM.

I don't have the expertise to understand all the specifications and nuances of the chip to suggest a replacement.

[king_raptor]

Re: Gateway FPD2485W - capacitor related?

I emailed him and he says they are on order and should be available next month. Do you think there is a way to find a different part, say from digikey that essentially does the same thing? Even if I had to replace all 4, that might be the way to go.

[retiredcaps]

Re: Gateway FPD2485W - capacitor related?

After removing one of the power mosfet (Q1) I tested from S-G, G-D and S-D as suggested and they were all less than 11 ohms, so it appears to be bad.

This auction has ended, but this seller has them

http://cgi.ebay.ph/LOT-4-AP9985GM-99...-/200436930981

I believe the seller, ecking767, has a good reputation on this forum for selling geniune caps (not fakes).

You can always send the seller an email to see if he will relist. Depending on your soldering skills, you might want to get 2? Since this is a 24 inch monitor, I would personally spend the money to get it fixed.

edit: findchips.com can't find AP9985GM through any of the usual suppliers

[Wrog]

Re: Gateway FPD2485W - capacitor related?

The Nichicon PW and HE are great, the Panasonic FM is great, the EB are questionable. One that concerns me is the Panasonic KG (P910-ND), the ripple is low (47mA) and the ESR is high (10 ohms). The Nichicon PW (493-1767-ND) would be much better here. I honestly don't know about the Nichicon TS and TT series, hopefully someone will chime in about those. It looks like you've confirmed a problem elsewhere with a FET, hopefully that will turn out to be the problem source.

[king_raptor]

Re: Gateway FPD2485W - capacitor related?

Attached is the order sheet for the parts I installed. Even though the EB series may not be ideal, the part P13478-ND was listed from someone else as being used and fixing the monitor, so I would assume it would be ok for mine. After removing one of the power mosfet (Q1) I tested from S-G, G-D and S-D as suggested and they were all less than 11 ohms, so it appears to be bad. The other 3 still on the board don't do this, so they may be ok.

[PlainBill]

Re: Gateway FPD2485W - capacitor related?

I'm attempting to remove one of them to test out of circuit. I have a desoldering iron with the squeeze bulb and a regular soldering iron. Any tips on how to remove this without ruining anything else? The leads on the MOSFET are small and all close together.

Far and away the best way to remove these is with a hot air SMD rework station such as the KADA 852D. Second best, and a lot cheaper is a product called Chip-Quik. It's a low melt alloy (Woods metal) that mixes with the solder and lowers the melting point. I recommend solder wick to clean up the residue, although I have done acceptable work with a soldering iron and a solder sucker.

PlainBill