Gateway FPD2185W

[bluto]

Re: Gateway FPD2185W

Well wishful thinking did not prevail here. The re-cap was not successful. The monitor is still doing the two seconds to black routine. I took apart the panel and found some of the ccfls with the LV wires nearly burned off and black bands at the ends of the ccfl tubes. So I guess I am looking at a total lamp replacement on this one. Wrog, do you remember what the out the door price was for the lamps and all assorted wiring/end caps? I found the lamp you mentioned on ebay from ccfl warehouse. Did you order the end caps/wiring seperately? Or did they allow you to do it all in one order/shipment? I also did not see the triple end cap on their website, only a single.

[Wrog]

Re: Gateway FPD2185W

I ordered them all together. What I did was send them an email (sales@ccflwarehouse.com) and explain the pricing from eBay combined with some of their items from their website. For instance, $8 per CCFL (460mm x 2.6mm), white return wire ($1 per foot, but you should be able to re-use most of the original wiring), etc. They also advertise $4.99 flat rate shipping. I asked them to send me an invoice through Paypal, and they did within an hour. I actually didn't ask for the triple end caps, they included them at no cost... One other thing that I ordered was some 1/2 inch kapton tape to hold the spliced/soldered return wires in place, I think it was like $1.75 for a 6 inch strip. Next time I'm just going to order a roll! Good luck and let us know how it goes!

Edit: I see you're from IL... whereabouts? My wife and I moved from Schaumburg around 6 years ago.

[soul12.0]

Re: Gateway FPD2185W

i got the same moniter i got 6 of the main power caps bulged and one bulged on the screen controler

any help would be great

[retiredcaps]

Re: Gateway FPD2185W

Have a read over

https://www.badcaps.net/forum/showthread.php?p=92533

that will help you choose and order caps.

i got the same moniter i got 6 of the main power caps bulged and one bulged on the screen controler

any help would be great

[PlainBill]

Re: Gateway FPD2185W

i got the same moniter i got 6 of the main power caps bulged and one bulged on the screen controler

any help would be great

The intelligent approach is to replace every electrolytic cap on the power supply and the 'logic card'. I recommend Panasonic FM caps from Digikey although other high quality low ESR caps also work well.

A first step would be to list the capacitance, voltage, diameter and height of every capacitor on the boards. Someone will then suggest replacements (The diameter and height are only required for those caps with limited clearance).

PlainBill

[bluto]

Re: Gateway FPD2185W

You will need the following caps for the powersupply:
(all listed are Panasonic FC) followed by Digikey part number

8x 470uf 25v P10275-ND
2x 220uf 25v P10271-ND
1x 47uf 25v P10267-ND
1x 10uf 50v P10316-ND

For the display board:

3x 470uf 16v P10247-ND


Just hope you don't have bad lamps too!

[smason]

Re: Gateway FPD2185W

I finally cracked open the one I have on my pile. 7 of the 8 classic 470 25s were bulged and some leaking, and 1 of the 3 470 16s on the main board was bulging. Replaced 'em all, and 2 others in the inverter section.
I have never tested it, I don't have a power cable at the moment.
Just for fun, measured a one of the 470s, 33uf and 9 ohms esr.
Will try to test soon.

[smason]

Re: Gateway FPD2185W

Well great news for me, it works perfectly. This was the best of 7 dead monitors I picked up for free. It looks brand new, still has the stickers on the front bezel.

I finished re-assembling it today, still don't have a power cable so I 'gator clipped power to it, and it fired right up. This really is a nice monitor. Well worth the $5.00 (approx) worth of caps Would be interesting to get the total on-time out of it, anyone know if that's available in a service menu?

[bluto]

Re: Gateway FPD2185W

I finally got around to replacing the lamps in my FPD2185. Unfortunately, after painstakingly wiring up the new lamps, I am still having a two seconds to black problem. I tried re-soldering the joints around the two big and the six little transformers (also checked resistance) over to the ccfl connectors to no avail. The problem seems to be one of 'insufficient voltage' to the ccfls. Sometimes two of the lamps on a side light, sometimes only one. When it is two lit, the center one it out on both sides. And a couple times the center one came on, but only by itself. Any ideas on how to proceed?

[retiredcaps]

Re: Gateway FPD2185W

... oops wrong post.

[Wrog]

Re: Gateway FPD2185W

I finally got around to replacing the lamps in my FPD2185. Unfortunately, after painstakingly wiring up the new lamps, I am still having a two seconds to black problem. I tried re-soldering the joints around the two big and the six little transformers (also checked resistance) over to the ccfl connectors to no avail. The problem seems to be one of 'insufficient voltage' to the ccfls. Sometimes two of the lamps on a side light, sometimes only one. When it is two lit, the center one it out on both sides. And a couple times the center one came on, but only by itself. Any ideas on how to proceed?

Did you ever test/check U301, U302, U304, U305 on the bottom side of the PCB (see post #13 in this thread). Those four drivers are notorious for failing on this model. If any one of them are bad, replace all four.

[bluto]

Re: Gateway FPD2185W

The thought crossed my mind to change them. I did a resistance check and here is what i found:

Transistor G – D D – S G – S
U301 (AOD405) 365k 360k 4.7k
U302 (AOD408) .77M 380k 347k
u304 (AOD405) 368k 364k 4.7k
u305 (AOD408) .75M 379k 346k

So I would say that they are not shorted, but could still be not working properly. And I could maybe see how this would cause lower power output to the CCFL transformers. For the cost, I might as well replace them since am in this far already. Unfortunately Digikey is showing a lead time of over a month to get the AOD417 (AOD405 replacement) back in stock

Anyone else have any ideas? PlainBill?

[PlainBill]

Re: Gateway FPD2185W

The thought crossed my mind to change them. I did a resistance check and here is what i found:

Transistor G – D D – S G – S
U301 (AOD405) 365k 360k 4.7k
U302 (AOD408) .77M 380k 347k
u304 (AOD405) 368k 364k 4.7k
u305 (AOD408) .75M 379k 346k

So I would say that they are not shorted, but could still be not working properly. And I could maybe see how this would cause lower power output to the CCFL transformers. For the cost, I might as well replace them since am in this far already. Unfortunately Digikey is showing a lead time of over a month to get the AOD417 (AOD405 replacement) back in stock

Anyone else have any ideas? PlainBill?

This is likely to be a painful process. There are several different monitors which use small and large transformers in the inverter. I have only a vague idea of how this SHOULD work.

Let's start at the controller and see if we can isolate the cause of the problem. What is the part number of U303, the inverter controller? I seem to remember that locating a datasheet was a sticking point on another one of these designs.

Also, if ANYONE has come across a schematic or service manual for this monitor, I would appreciate knowing about it. Even a service manual or schematic for any monitor using the small transformers would help me.

PlainBill

[bluto]

Re: Gateway FPD2185W

Also what should the resistance on the transformers be?

On the big ones I get ~.6 ohm across the primaries and ~154 ohms across the secondaries. Could this be a short on the primary side? There is not much between the transistors and the primary windings, just a couple smd capacitors (c314, c315, and c317) and those don't show a short across them.

The small transformers all show ~0.6ohm on the primary and ~220ohms on the secondary.

My next move might be to take a set of lamps out of another panel and solder the leads for them directly to the board. Then see if I still get 2 seconds to black.

[bluto]

Re: Gateway FPD2185W

The U303 controller chip is a BIT3193G. Curt Palme mentioned ordering some in this thread: https://www.badcaps.net/forum/showthread.php?t=10364

No word on success or failure though (I asked!).

[Wrog]

Re: Gateway FPD2185W

The thought crossed my mind to change them. I did a resistance check and here is what i found:

Transistor G – D D – S G – S
U301 (AOD405) 365k 360k 4.7k
U302 (AOD408) .77M 380k 347k
u304 (AOD405) 368k 364k 4.7k
u305 (AOD408) .75M 379k 346k

So I would say that they are not shorted, but could still be not working properly. And I could maybe see how this would cause lower power output to the CCFL transformers. For the cost, I might as well replace them since am in this far already. Unfortunately Digikey is showing a lead time of over a month to get the AOD417 (AOD405 replacement) back in stock

Anyone else have any ideas? PlainBill?

Definitely not shorted. You could always go the eBay route for a little bit extra ($10 shipped; Digikey would be around $5 shipped).

Edit: I may have some extras here, let me look around.

[PlainBill]

Re: Gateway FPD2185W

The U303 controller chip is a BIT3193G. Curt Palme mentioned ordering some in this thread: https://www.badcaps.net/forum/showthread.php?t=10364

No word on success or failure though (I asked!).

It's unlikely that replacing the controller would solve the problem. I'm trying to approach it from the other direction - determine why it's shutting down. Already I'm running into a problem. I've found only two pictures of the bottom of the board. The one at the beginning of this thread is the best. And even on that one I can't be certain where pin 1 is. Is it at the upper left-hand corner of the IC in that picture?

PlainBill

[bluto]

Re: Gateway FPD2185W

Yes pin 1 of the controller chip is shown on the top left in the picture in the first post of this thread.

[bluto]

Re: Gateway FPD2185W

Well I tried it, I soldered a set of ccfls from another panel directly onto the board. The results were the same. Only one lamp would light at a time, and not necessarily the same one each time. The other side (the ones with the plugs) will sometimes light up two at a time. I would have done both sets of lamps from the donor panel, but alas I broke the lamps on the second set getting them out. So now I am pretty sure nothing is wrong with the new lamps. There just does not seem to be enough oomph to start them all at once. Would increasing the capacitance on the two caps in between the transistors help? They are only at 220uf each.

You can't see much from the picture, but I will post it anyway.

[PlainBill]

Re: Gateway FPD2185W

Yes pin 1 of the controller chip is shown on the top left in the picture in the first post of this thread.

Thanks. You have a PM.

PlainBill