Gateway FPD2485W - capacitor related?

[smason]

Re: Gateway FPD2485W - capacitor related?

I'd be veryt surprised if the re-cap didn't fix it.
I've done 2 Gateway monitors and both were just caps.

Also, just because it works after warm-up doesn't mean you should run it.
If the caps are bad, other components will be suffering due to ripple, possible over-voltage etc.

[larrybrownsr]

Re: Gateway FPD2485W - capacitor related?

Recap as a first step then move on to other troubleshooting if that does not resolve the problem. LCDAlternatives seems to use good brands, so you are covered there. If you want to save a little money next time, put together a list of what you need and folks here will give suggestions on what to buy.

Hmm.. after looking at one of their other Gateway models (FPD1975W), their cap list is different than what I've seen for this model. Their website says there are 6 different cap values (total of 7) but I just had one open here a few days ago and replaced a total of 10 on the power board (only 3 different cap values; there weren't 1000uF, 680uF or 150uF caps on my board). Definitely double check what you receive versus what you need before you start working on it! If there is any doubt, post pics with your questions.

Thanks, Wrog. I'll follow all of your suggestions and let you know how things work out. It'll most likely be a while before I work up the guts to try it, though. Since my monitor does work OK after a 10 to 15 minute worm-up. You wouldn't know where I could get a schematic diagram of this monitor, would you?

[Wrog]

Re: Gateway FPD2485W - capacitor related?

From the prices I've seen quoted here, I think I paid more than I should have ($14 + shipping) for a complete set of caps, but I liked the fact that LCDalternatives offered a complete set and I didn't have to search out each one of them.
If you think the caps won't help or you have any other suggestions, I would appreciate any and all comments.
Thanks - Larry (Mesa, AZ)

Recap as a first step then move on to other troubleshooting if that does not resolve the problem. LCDAlternatives seems to use good brands, so you are covered there. If you want to save a little money next time, put together a list of what you need and folks here will give suggestions on what to buy.

Hmm.. after looking at one of their other Gateway models (FPD1975W), their cap list is different than what I've seen for this model. Their website says there are 6 different cap values (total of 7) but I just had one open here a few days ago and replaced a total of 10 on the power board (only 3 different cap values; there weren't 1000uF, 680uF or 150uF caps on my board). Definitely double check what you receive versus what you need before you start working on it! If there is any doubt, post pics with your questions.

[larrybrownsr]

Re: Gateway FPD2485W - capacitor related?

Thanks, for the welcome. My monitor is a Gateway FPD2485W. I've tried 3 different inputs: DVI, VGA, and RCA and all work the same. After sitting all night, when I first turn it on the logo shows for about a second, then the screen goes black. After a minute or two if I remove the input, wait a few seconds and apply it again the picture shows on the screen for less than a second and then black. After leaving everything on for about 10 minutes with the power indicator and the menu select indicators showing blue, I turn off the input, pause for a few seconds and turn the input back on and wait for a second or so, the picture shows on the screen. It is a little dim for a minute or so, but slowly gets to full brightness. The monitor is fine after that. I can change input among my PC, a TV tuner, and a DVD player with no problems. But if I turn it off via the power touch sensor or unplug it for a few minutes, I'm back into the problem again.
From the prices I've seen quoted here, I think I paid more than I should have ($14 + shipping) for a complete set of caps, but I liked the fact that LCDalternatives offered a complete set and I didn't have to search out each one of them.
If you think the caps won't help or you have any other suggestions, I would appreciate any and all comments.
Thanks - Larry (Mesa, AZ)

[smason]

Re: Gateway FPD2485W - capacitor related?

I am brandnew to Badcaps and sending this to turn on full capability for my account. I'll use this to say that I am very impressed by you guys on this forum. You have given me the guts to just go ahead and try replacing the capacitors on my power board. I just ordered a complete set of caps. What can I lose for 17 bucks including shipping.
Thanks, everyone.

Hi and welcome! What kind of monitor? And what symptoms?
$17.00 seems like a lot of caps, where did you order from?

[larrybrownsr]

Re: Gateway FPD2485W - capacitor related?

I am brandnew to Badcaps and sending this to turn on full capability for my account. I'll use this to say that I am very impressed by you guys on this forum. You have given me the guts to just go ahead and try replacing the capacitors on my power board. I just ordered a complete set of caps. What can I lose for 17 bucks including shipping.
Thanks, everyone.

[kc8adu]

Re: Gateway FPD2485W - capacitor related?

with that many issues i suspect it got spiked.
and spills mess up the touch controls.
if the scaler(video processor chip) were bad you would not be commenting on its being a beautiful panel.

[badcaps@tomsbikesite.com]

Re: Gateway FPD2485W - capacitor related?

Just in case anyone has a Gateway FPD2485W monitor that displays symptoms like the ones I described at the top of this post. I thought I'd post a final update to let people know what they can expect if they decide to tackle this on their own. I ended up selling (for shipping cost plus a few dollars) this unit to a person who had much more technical know-how, and more time than I could afford. He was gracious enough to let me know what he found when he dug in. From him:

...I ordered a few 497-1241-1-ND from Digikey to replace the dud regulators (AS1117L-33, there are 2 of them on the logic board and 1 on the USB sub-board) and changed them out, and this corrected the issue with being able to start up again from sleep mode. However, it seems the logic board has sustained permanent damage to the video processor chip (not easily replaceable) because the touch controls are still funky. I may try to trace this down at some point just to make sure it's not the processor chip. I also suspect that the weak transformer may become an issue soon but until then it's definitely a beautiful LCD panel. Many thanks again for the practice, I really appreciate it.

Lesson learned: it's likely to be more than just bad capacitors.

[CATPart]

Re: Gateway FPD2485W - capacitor related?

Also, could you explain how I can test the transistor and rectifier for shorts?

I can see that my fuse has some black residue coming from under it, so I am guessing it has blown.

my monitor just turned off suddenly while using it. if the easiest thing to try is replacing the power supply then I will do that. I do have an ohm meter, so I should at least check for shorts like you have mentioned.

Thanks for help

[CATPart]

Re: Gateway FPD2485W - capacitor related?

@tvandlcdrepair or anyone who knows

Where can I buy this power supply? I have been googling and can't come up with anything. Thanks.

[badcaps@tomsbikesite.com]

Re: Gateway FPD2485W - capacitor related?

RacerX,
I have not checked that fuse. I'm not sure I understand how a blown fuse could cause the symptoms I describe (menus system slowing down, but still working; sync with signal slowing down, but still, eventually working, if the power cord unplugged/replugged). It seems like a blown fuse would stay blown and cause constant (unchanging over time) problems.

[tvandlcdrepair]

Re: Gateway FPD2485W - capacitor related?

Anyone know a place to by this T5a 250V radial type fuse?

Yes, they are called an SR-5 style fuse and come in a vast number of current ratings, they are very common in LCD TV's and Monitors. You can get them from Digikey, a 5A slow acting fuse is $1.46 quantity 1 here is a link 5A 250v FUSE


If your fuse is blowing immediately then you need to check your bridge rectifier, D850 (I think, the angle on the picture makes it hard to be sure) for a short. You also need to check the primary side switching transistor Q850 for a short before switching on with a new fuse. Do those checks with the power cord unplugged please! If you find a shorted component then replace the supply, most of these type supplies can be obtained for less than $75

NOTE: If you don't know how to safely use a volt meter DON'T TRY THIS! Take it to someone who does, YOU CAN KILL YOURSELF! You have been warned!!

If you find no primary side short then the next step is to verify the power supply outputs, keep the the power supply unplugged from the inverter and the processor board for this test. Watch out for the heatsinks on the primary side of the supply they and all of the primary side components are at LINE VOLTAGE and will give you a nasty shock if you touch them. CAREFULLY! Power up the supply and check for voltage on the output connectors. You should find a solid +5v on the processor plug (more than one pin) and maybe a +12v as well, there will also be several ground connections and some logic connections as well.
The inverter plug should be half ground connections and half +12v or +24v to run the inverters, along with two lines for inverter on/off and inverter brightness. If you don't find any output voltage or the voltages are fluctuating, replace the supply.

NOTE: If you don't know how to safely use a volt meter DON'T TRY THIS! Take it to someone who does, YOU CAN KILL YOURSELF! You have been warned!!

If the output voltages are present and stable then UNPLUG the POWER CORD. Let the power supply sit for 2 min to discharge the caps.

....... 2 min goes by.......

Reattach the processor power connection, again plug in the POWER CORD. Using the cautions mentioned above check if the output voltages are still the same. If they are not then you have a processor board putting too much load on the power supply, REPLACE the PROCESSOR board.

If all is looking good then UNPLUG the POWER CORD

........ wait 2 min ...........

Reattach the inverter power connection and test it like you did the processor power. BE CAREFUL there are dangerous voltages in these power supplies. The inverters typically put out around 2500v to light the ccfl tubes! EXERCISE GREAT CAUTION! If the inverter causes the supply voltage to drop then replace the inverter board.

If all the voltages are stable then you have a working power supply and your monitor should power up. Of course there are many other things besides a power supply that can cause it not to work, <Bummer>

GB

[RacerX]

Re: Gateway FPD2485W - capacitor related?

Did you try or test the fuse next to the AC adaper plug? As you can see on the board and even in your first pic, the powerboard has printed next to the fuse F850 "T5a 250v". It looks like a light brown color. I also replaced the caps and stiil no power. Took it to a local store and the fuse tested dead.

Had someone else pick up a new fuse, but I noticed it was the wrong voltage 5A @125v instead of 250v. Tried it anyway and when I plugged in the powercord the fuse blew and smoked instantly. After some research I found out the "T" 5A stands for time release fuses - also called slow-blow fuses. The 5A @125V is a Fast fuse (receipt actually says "Very Fast") which explains why it blew so fast .

Local store closed, so I have to wait until Monday to see if they carry the T5A 250V fuse as it is not listed on their website. Having trouble finding an online retailer that carries this fuse. Most places have the cylander glass-tube fuse rather than the radial fuse used on this powerboard.

Anyone know a place to by this T5a 250V radial type fuse?

[badcaps@tomsbikesite.com]

Re: Gateway FPD2485W - capacitor related?

Well, it looks like it will go to the landfill. All the caps replaced, never helped.

Not worth anything else.

Just in case someone else gets the same symptoms.

[seanc]

Re: Gateway FPD2485W - capacitor related?

Haha, from what I'd briefly read, I thought it just turned the monitor off if it fell over, yours is a much better reason :P

[MDOC]

Re: Gateway FPD2485W - capacitor related?

Er, rather the image display itself remains "right side up" as you rotate the monitor.

[MDOC]

Re: Gateway FPD2485W - capacitor related?

If you Google 'RBS31' you will find out what you have and why it makes that noise.


PlainBill

Why, it's a roll ball tilt sensor switch with a photo transistor. Rotate the monitor, and the display itself follows suit.

The noise is from a metal (stainless steel) ball rolling around inside the housing.

datasheet attached.

[PlainBill]

Re: Gateway FPD2485W - capacitor related?

OK, I had a chance to take my processor board out. It seems that my part has the same 'feature' - making noise like something is rolling around.

I'm attaching a close-up pic of the part so people can more clearly see it.

I wish I could be more helpful, but I'm not even sure what a "data sheet" for a component is.

I think I will try replacing the caps on the processor board; mostly out of curiosity, and to try to save landfill space. I'll post again when I've got more to say on this.

If you Google 'RBS31' you will find out what you have and why it makes that noise.

I'll leave it as an exercise to the student to figure out why it is present on this monitor.

PlainBill

[badcaps@tomsbikesite.com]

Re: Gateway FPD2485W - capacitor related?

OK, PlainBill and I were discussing a similar problem with a Gateway monitor on another post recently (Gateway fpd1975w). I came across your thread while searching for an answer. On the second photo (processor board), there is a component that has me concerned. On the photo, it is at the bottom right hand side of the blue oval. It is marked HT RBS31. I tried searching for a data sheet on this object and couldnt find one. My gateway processor board is different than this one however it has this same part. I noticed that this part, for some reason, has something moving around inside of it. My logic suggests that this cannot be a good thing. Anyone else ever see or test this component before? It almost looks like a photo trasistor or some type of isolation component.

OK, I had a chance to take my processor board out. It seems that my part has the same 'feature' - making noise like something is rolling around.

I'm attaching a close-up pic of the part so people can more clearly see it.

I wish I could be more helpful, but I'm not even sure what a "data sheet" for a component is.

I think I will try replacing the caps on the processor board; mostly out of curiosity, and to try to save landfill space. I'll post again when I've got more to say on this.

[RacerX]

Re: Gateway FPD2485W - capacitor related?

I also found a MarVac electronic parts store which is about 5 minutes from me...

Here's a cap for the bulged 35v/470uf: 470uF, 35V Radial Capacitor. I see the temp is rated 85C, which is lower than my OEM 105C, but otherwise would that cap work? For 50 cents I thought I'd pick one up just to see if it would make a difference to the power-board. Then I could order the better caps from Digikey for the long term fix.

1:25am - time for some sleep.