I have a gateway lcd that will not turn on . I have 135vdc at the filter cap .The esr values on all caps are ok to insure no parallel I removed the caps for measurment . I have inspected the circuit boards with an eye loop and found no bad joints . It has a switchless control does anyone know how to check this switch or bypass it on the main board /
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Re: need help with a gateway lp2407/fpd2484
Define 'turn on'. Is the power supply producing normal voltages? As far as the switch, usually it is monitored by a processor on the signal card.
Note my signature. Assisting without benefit of adequate pictures is difficult.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic. -
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.Comment
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Re: need help with a gateway lp2407/fpd2484
That is not right unless your line voltage is about 95V AC. It *may* indicate a failed diode in the main bridge rectifier. Unless/until the DC voltage across the main (filter) cap is correct I wouldn't be looking further downstream. Others may see this differently.Friends don't let friends buy Samsung ....Comment
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For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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Re: need help with a gateway lp2407/fpd2484
sorry if I offended you .Comment
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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.Comment
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Re: need help with a gateway lp2407/fpd2484
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.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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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--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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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 .Attached FilesComment
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Last edited by retiredcaps; 02-15-2011, 01:40 PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: need help with a gateway lp2407/fpd2484
it is a homemade meter made from instructions from http://ludens.cl .Comment
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--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: need help with a gateway lp2407/fpd2484
Its 185 but I am using an isolation transformer that 133vac outComment
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Re: need help with a gateway lp2407/fpd2484
DisregardComment
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Re: need help with a gateway lp2407/fpd2484
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?
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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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 ,Attached FilesComment
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For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.Comment
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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 .Attached FilesComment
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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 questionAttached FilesComment
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I am really needing Schematics for the motherboard on my Gateway laptop model GWTN-156-7BL
I attached a pic of motherboard info
...04-25-2025, 07:01 AM -
Greetings everyone,
I have a Gateway P5WS0/NV57H58u laptop (P5WEO LA-6901P REV:2.0). The client said the battery was not charging. Upon checking the laptop,
1) On pressing the power button, the (power button) light turns on and stays on.
2) There is no boot, or anything on the screen.
3) The fan starts and stops a few times, then it stops completely.
4) The light on the power button remains on.
5) Battery not charging (original issue).
The original problem was that the battery was not charging, but the laptop still worked. My belief... -
Hello everyone, I have a laptop Gateway GWTN156-12BL, (XA133P rev 2.0) There was a crashed BIOS, I was able to find one for the GWTN156-12BK, and it rebooted. Can anyone share a BIOS dump for this model?
S/N 2GWTN15612BL2J21J008090... -
Gateway ID49C04u ID49C11u Laptop Schematic...11-01-2024, 06:46 AM
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Gateway NV53 Series Laptop Schematic
Wistron SJV50-TR 09228-1 48.4FM01.011 Rev 1M...11-01-2024, 02:54 AM
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