Gateway FPD2485W Problem

[truetejas]

This is my first post, so thanks to all of you that share your expertise and information.

I have a Gateway FPD2485W that was given to me. Gateway replaced the original monitor when it went bad after 9 months, but the replacement worked one day and quit. The owner got the runaround and went out and bought a Mac. The replacement was in his closet for over a year and he just gave it to me. The problem is that it will work fine for some period of time (5 to 15 minutes) and then it goes crazy; basically a white screen which can have black or gray horizontal lines (or blocks) moving down it from top to bottom. If you let it cool down, the process can be repeated.

I am not a trained electronics tech, but I have replaced the caps on several motherboards with success. Now I have this sucker apart and cannot see any visible damage. My original plan was to replace the caps on the power board, so I removed them and tested them with an Ohm meter (which I realize is a poor way to test, but it's all I have). With this test they perform just like a new capacitor, and they look perfect. So, before I go chasing my tail any more than I already have, I have 3 questions I would like to ask:

1. Do the symptoms I described earlier (white screen, horizontal lines and blocks) suggest a problem that someone can diagnose and suggest a course of repair that goes beyond replacing the caps?

2. The original manufacturer of the installed caps is Su'Scon and 4 of the 12 have temperature ratings of 125* C. Only SG and SH series are used, SG (high ripple & low impedance) and SH (high temp & reliablity).

Power ICBoard
10uF 50V 105* C
47uF 50V 105* C
470uF 35V 105* C
470uF 35V 125* C
470uF 25V 105* C
680uF 25V 105* C
1000uF 10V 125* C
1000uF 10V 105* C
1000uF 25V 105* C

Processor ICBoard
10uF 16V 105* C
47uF 16V 105* C
100uF 16V 105* C
470uF 10V 105* C


Is Su'Scon a reliable brand? I have researched replacement caps, but haven't found identical specs. Do you have suggestions for replacement parts (brand/series)?

3. I think Mouser Electronics has the closest match to what I need, but I'm not really sure what the best match would be when it comes to ESR. What is a reliable source for these parts if their replacement is necessary?

I am attaching pictures. There is a spot where the external cord plugs in where it looks a little suspicious in the pwr_close picture, but I doubt is is the cause of the problem.

Thanks in advance. Any help you can provide is greatly appreciated.

tt

[PlainBill]

Re: Gateway FPD2485W Problem

This is my first post, so thanks to all of you that share your expertise and information.

I have a Gateway FPD2485W that was given to me. Gateway replaced the original monitor when it went bad after 9 months, but the replacement worked one day and quit. The owner got the runaround and went out and bought a Mac. The replacement was in his closet for over a year and he just gave it to me. The problem is that it will work fine for some period of time (5 to 15 minutes) and then it goes crazy; basically a white screen which can have black or gray horizontal lines (or blocks) moving down it from top to bottom. If you let it cool down, the process can be repeated.

I am not a trained electronics tech, but I have replaced the caps on several motherboards with success. Now I have this sucker apart and cannot see any visible damage. My original plan was to replace the caps on the power board, so I removed them and tested them with an Ohm meter (which I realize is a poor way to test, but it's all I have). With this test they perform just like a new capacitor, and they look perfect. So, before I go chasing my tail any more than I already have, I have 3 questions I would like to ask:

1. Do the symptoms I described earlier (white screen, horizontal lines and blocks) suggest a problem that someone can diagnose and suggest a course of repair that goes beyond replacing the caps?

2. The original manufacturer of the installed caps is Su'Scon and 4 of the 12 have temperature ratings of 125* C. Only SG and SH series are used, SG (high ripple & low impedance) and SH (high temp & reliablity).

Power ICBoard
10uF 50V 105* C
47uF 50V 105* C
470uF 35V 105* C
470uF 35V 125* C
470uF 25V 105* C
680uF 25V 105* C
1000uF 10V 125* C
1000uF 10V 105* C
1000uF 25V 105* C

Processor ICBoard
10uF 16V 105* C
47uF 16V 105* C
100uF 16V 105* C
470uF 10V 105* C


Is Su'Scon a reliable brand? I have researched replacement caps, but haven't found identical specs. Do you have suggestions for replacement parts (brand/series)?

3. I think Mouser Electronics has the closest match to what I need, but I'm not really sure what the best match would be when it comes to ESR. What is a reliable source for these parts if their replacement is necessary?

I am attaching pictures. There is a spot where the external cord plugs in where it looks a little suspicious in the pwr_close picture, but I doubt is is the cause of the problem.

Thanks in advance. Any help you can provide is greatly appreciated.

tt

Su'Scon is on the list of bad cap manufacturers: https://www.badcaps.net/forum/showthread.php?t=388

The symptoms you describe COULD be bad caps; I had something similar on the 22" monitor I am using now. Or it could be some other component failing when it warms up. An ohmmeter or even a capacitance meter won't detect caps with high ESR. That requires an ESR meter. My general rule is to replace ALL capacitors (except the large 120 uF, 450 V one) if they are from a known bad manufacturer.

My preferred replacement caps are Panasonic FM and FC series. My vendor of choice is DigiKey, chiefly because they have a First Class Mail shipping option. A complete set of replacement caps will cost about $10, including shipping. Mouser is also a good vendor, but their cheapest shipping costs about $4 more and is usually slower.

Double check the dimensions of the replacements. It is embarrassing if the new caps won't fit.

PlainBill

[EGuevarae]

Re: Gateway FPD2485W Problem

Su'Scon is on the list of bad cap manufacturers: https://www.badcaps.net/forum/showthread.php?t=388

The symptoms you describe COULD be bad caps; I had something similar on the 22" monitor I am using now. Or it could be some other component failing when it warms up. An ohmmeter or even a capacitance meter won't detect caps with high ESR. That requires an ESR meter. My general rule is to replace ALL capacitors (except the large 120 uF, 450 V one) if they are from a known bad manufacturer.

My preferred replacement caps are Panasonic FM and FC series. My vendor of choice is DigiKey, chiefly because they have a First Class Mail shipping option. A complete set of replacement caps will cost about $10, including shipping. Mouser is also a good vendor, but their cheapest shipping costs about $4 more and is usually slower.

Double check the dimensions of the replacements. It is embarrassing if the new caps won't fit.

PlainBill

I agree. Get all those "sucks'con" out of the unit. Panasonic FC/FM are good replacements.

[truetejas]

Re: Gateway FPD2485W Problem

Thanks guys. The problem I am having is obtaining a 125* C capacitor. None are listed at the DigiKey site (in small size & small uF) and the ones at Mouser are on order (should be in stock in 8 weeks). I would like to get all the parts from the same source so I guess I'll order a lower temp (105* C) substitute for now and replace them in 8 weeks. This unit runs HOT so I doubt lower temp parts will work over the long term.

I am considering installing a small fan on the back of the LCD case to cool the components by blowing air directly into the case. Would that introduce interference (noise) to the circuits?

I'll post back with the results. Thanks again.

[lucky13]

Re: Gateway FPD2485W Problem

Can you circle on your pix of the board where the 125° caps go?

I don't think the monitor gets that hot!!

[truetejas]

Re: Gateway FPD2485W Problem

Can you circle on your pix of the board where the 125° caps go?

I don't think the monitor gets that hot!!

I have not run the monitor for any protracted period, but it does radiate a lot of heat after just a few minutes operation. The fellow that gave it to me said the room it was in was noticeably warmer when the monitor was on.

The attached picture was taken prior to removing the caps. The 4 that are circled are all 125* C and located at the top of the ICB when the monitor is upright.

[Bobdee]

Re: Gateway FPD2485W Problem

Phewww thats some inverter in background no wonder it gets hot
???How many lamps that monster got???

[truetejas]

Re: Gateway FPD2485W Problem

This is the first LCD I've worked on. But, there are 12 of those transformers(?) on the inverter that lead to 6 plugs which I assume are the lamps. So I guess the answer is 6.

[Bobdee]

Re: Gateway FPD2485W Problem

This is the first LCD I've worked on. But, there are 12 of those transformers(?) on the inverter that lead to 6 plugs which I assume are the lamps. So I guess the answer is 6.

If those 6 plugs got more than 2 wires coming out each of them, then I would not mind betting there is 12 in there like the big TVs that the lamps go across the screen

[truetejas]

Re: Gateway FPD2485W Problem

I don't have a picture of just the inverter, but the 6 plugs each have 2 wires that are both blue. I haven't checked to see if they were both hot. The little "danger" signs pasted on all of them worked with me ;-)

[EGuevarae]

Re: Gateway FPD2485W Problem

The little "danger" signs pasted on all of them worked with me ;-)

[bobdude11]

Re: Gateway FPD2485W Problem

Just curious,
How did you get the case apart - I have the screws removed I just can't figure out where the thing is held together to release it. I don't want to tear it up in case I can fix it - then I'll have two of these bad boys hanging off my card ...

[PlainBill]

Re: Gateway FPD2485W Problem

Just curious,
How did you get the case apart - I have the screws removed I just can't figure out where the thing is held together to release it. I don't want to tear it up in case I can fix it - then I'll have two of these bad boys hanging off my card ...

The two halves of the case snap together. Some people use a credit card to release the catches, others use a guitar pick. For a Gateway, little will be lost if you use a chainsaw.

PlainBill

[bobdude11]

Re: Gateway FPD2485W Problem

The two halves of the case snap together. Some people use a credit card to release the catches, others use a guitar pick. For a Gateway, little will be lost if you use a chainsaw.

PlainBill

Thanks - I figured they snapped, but wanted to be sure - I just can't get them to release ...

[PlainBill]

Re: Gateway FPD2485W Problem

Thanks - I figured they snapped, but wanted to be sure - I just can't get them to release ...

I usually start on the bottom of the case (so any scratches aren't visible), forcing the two pieces apart and work my way toward one corner.

PlainBill

[Krankshaft]

Re: Gateway FPD2485W Problem

With the Dell monitors I used the metal bottle cap opener on a Swiss army knife I put it through the ventilation slats and depressed the tabs.

Don't know if Gateway uses the same slat system though.

Nowadays it's either clipped or glued together.

I miss the good old days when cases were secured with screws!

[truetejas]

Re: Gateway FPD2485W Problem

To answer a little more in detail on taking the FPD2485W case apart do this:

1. Take the 3 screws out along the bottom back edge.
2. Remove the 4 screws that attach the mount to the middle of the back.
3. Now insert a thin screwdriver in the slot on one corner. There is a release here. Work with one corner at a time, push the screwdriver in and pry apart the case at the corner (this is the tricky part). When it separates a little, work your way down along the edge. There are 3 plastic clips that must be pushed in to release the back from the front. I used 2 small screwdrivers and worked my way along the edge, but a credit card would work if you knew exactly where to push it in. The problem is that you cannot just slide it along the edge because there is a brace on either side of each clip and it blocks the card's path. The clips sit between the braces and are about an inch wide.

I am still waiting for my 125 degree caps to arrive. Will post results when I get them in late October.

Good luck!

[Player2]

Re: Gateway FPD2485W Problem

My favorite tool for splitting LCD cases is a small putty spade I got at Lowe's. It's thin enough to get in any case, and wide enough to distribute the leverage so that it doesn't leave little indentations like small screwdrivers tend to do.

I'm interested to see how this repair turns out. I tried to repair one of these for a former coworker. The signal was all wonky and I couldn't find the problem, so I replaced the signal board. It ran fine for 24 hours, then I gave it back to him and after a couple days he said it started doing it again. I thought maybe it was something specific to his setup that was causing problems (he had a different model LCD boxed up for RMA the second time I went there), but it sounds a lot like your story.

Good luck!

[pixmanvegas]

Re: Gateway FPD2485W Problem

Hopefully, this will bump this old discussion.
I'm working on fixing my monitor. I have a kit off amazon that came with all the capacitors you should need to replace.
Question...
Do I need to replace ALL of them or just the ones that are swollen?
Also, there is a part that is obviously burned up that I need help identifying.
It is the green ceramic capacitor I have circled. this is not a picture of my board. Mine is burned all around this area and the capacitor itself crumbled when I tried to get it out so I can't read it.
The spot on the board is labeled RT851
The one right next to it is labeled RT582 on the board and the capacitor is labeled SCK 2R56. Is it the same because it LOOKS the same before it crumbled.
So to summarize my questions for clarity;
1. What do I need to get to replace this?
2. Is this part of the video or audio system?
3. Do I need to replace ALL the capacitors or just the swollen ones or is there a way to tell which ones are bad?
Thank you for helping a novice out.

[budm]

Re: Gateway FPD2485W Problem

RT851, 852 are not capacitors, they are NTC current limiter, it will burn up if you have shorted circuit, they may not be the same value.
Search the web for 'SCK 2R56' then you will see what it is.
I would replace all the caps except the main filter cap.
Can we see the bottom side of the board?