need help with a gateway lp2407/fpd2484

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

It is an fr30-10 the data sheet can be found at www.datasheetarchive.com

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

the data sheet can be found at www.datasheetarchive.com

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

the markings on the diode are
FR30-10
469

[PlainBill]

Re: need help with a gateway lp2407/fpd2484

I should have known I seem to be fixated on the power switch because I have no clue on how to test it .
I made a stupid mistake when unsoldering the board after hearing 3 load pops I reliazed that I forgot unplug the power and dischard the filter cap I may be getting to old for this . I cant see any burnt areas are cracked parts so maybe the is no uncoverable damage .

Well, keep your fingers crossed. What is the part number of the IC?

PlainBill

[darnwalls005]

need help with a gateway lp2407/fpd2484

i also need help with a gateway lp2407. the diode at marker d851 on the main power supply board got burnt out and was trying to identify the specifications on it so i can replace it

i cropped a picture of the diode in question

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

I should have known I seem to be fixated on the power switch because I have no clue on how to test it .
I made a stupid mistake when unsoldering the board after hearing 3 load pops I reliazed that I forgot unplug the power and dischard the filter cap I may be getting to old for this . I cant see any burnt areas are cracked parts so maybe the is no uncoverable damage .

[PlainBill]

Re: need help with a gateway lp2407/fpd2484

The chip is
synapac
t1007 0541
amn371-12
The sharing of your expertize is greatly appreciated . My wife has malcurlar degeneration and this large screen would be a great help for her ,

Sorry, I wasn't clear. The daughter board is the board mounted vertically on the main power supply. That contains the SMPS controller, which is the next area to be investigated.

PlainBill

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

The chip is
synapac
t1007 0541
amn371-12
The sharing of your expertize is greatly appreciated . My wife has malcurlar degeneration and this large screen would be a great help for her ,

[PlainBill]

Re: need help with a gateway lp2407/fpd2484

Its 185 but I am using an isolation transformer that 133vac out

That explains the voltage. The isolation transformer is a nice touch, wish I could find mine (how can someone lose an isolation transformer?)

I'd like a picture of the daughter board if possible. I realize that's pretty cramped. What is the part number of the IC?

PlainBill

[jetadm123]

Re: need help with a gateway lp2407/fpd2484

Disregard

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

Its 185 but I am using an isolation transformer that 133vac out

[retiredcaps]

Re: need help with a gateway lp2407/fpd2484

The voltage at the filter cap was a typo it is 185vdc .

Hmm, I think I deleted my response by mistake.

Is that 185V DC? If yes, it still seems off from the traditional 165V DC.

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

it is a homemade meter made from instructions from http://ludens.cl .

[retiredcaps]

Re: need help with a gateway lp2407/fpd2484

I rechecked the esr readings of the caps and all read 0 ohms

What type of ESR meter do you have?

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

The voltage at the filter cap was a typo it is 185vdc .I rechecked the esr readings of the caps and all read 0 ohms with my .

[retiredcaps]

Re: need help with a gateway lp2407/fpd2484

If you are in the USA, your mains are 120V AC. Voltage across the main filter capacitor is 120V AC x 1.414 = roughly 165V DC.

0.5 ohms ESR depending on the uF, voltage, diameter, and height of the cap can by too high.

For example, a Panasonic FR 1000uF 25V cap has an ESR of 0.018 ohms according to

http://search.digikey.com/scripts/Dk...name=P14425-ND

[PlainBill]

Re: need help with a gateway lp2407/fpd2484

sorry if I offended you .

Let me explain my insistence on pictures. First of all, Gateway does not build these monitors; rather they are designed and built by one or more companies in China. As a result an FPD2484 can have one of several different power supplies, LCD panels, and even signal cards. Telling someone to measure the voltage across C10 (start up capacitor in one design) would be meaningless if in his version C10 was a line noise suppression cap.

Even in the case of a single power supply, I would have to first locate a picture of the power supply (schematics are very hard to come by for Gateway products), then identify the critical points to measure.

PlainBill

[jetadm123]

Re: need help with a gateway lp2407/fpd2484

I think one of the main problems here is lack of photos. You may think they are unimportant, but since we're not sitting next to you or looking over your shoulder, it's hard to follow what's going on. Members need good focused photos to suggest what components to test. And they need to see photos of YOUR boards, since there are probably different revisions/configurations out there. And finally, I agree with pedro and PlainBill that the 135V across the main cap is a problem.

[chetreynolds]

Re: need help with a gateway lp2407/fpd2484

sorry if I offended you .

[PlainBill]

Re: need help with a gateway lp2407/fpd2484

there are no indicator lights the only voltage that I can check is the raw input voltage which is 135vdc . Trust me pictures will not help I have examined every connection with an eye loop and removed every cap and measured its esr all are less than .5 ohms . I suspect that there is no on signal from the front panel but I dont know howm to test it . It is a switchless device.

The power supply is always on - or at least the 5V standby portion.

But since you know more than I do, fix it yourself.

By the way, you should be asking yourself why the input voltage is 135VDC.

PlainBill