Thanks for the confirmation. I've lifted pin 13 from the PCB, and indeed FAN7314 has 27 Ohms between Vin and GND.
So, another thing to order and wait a bit. Ah well.
sinip
Member
Last Activity: 06-11-2023, 02:05 PM
Joined: 12-10-2011
Location: Doboj
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Re: Samsung Syncmaster T220 blown green fuse F301
Thanks for the confirmation. I've lifted pin 13 from the PCB, and indeed FAN7314 has 27 Ohms between Vin and GND.
So, another thing to order and wait a bit. Ah well.
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Re: Samsung Syncmaster T220 blown green fuse F301
However, on the second look...
The resistance across C301 is still kind of low - 27 Ohms or so, and that cap is across ground and pin 13 - Vin of the FAN7317 chip, which is an actual inverter and Fairchild's PDF file has a typical application circuit of the inverter, including MOSFETs, transformers and all.
So, I wonder now, in the absence of another FAN7317 for comparison, whether it is fried too?Leave a comment:
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Re: Samsung Syncmaster T220 blown green fuse F301
Thanks, yep, I desoldered those two MOSFETs, and resistance is back to normal across C301.
I'll check those caps as soon as I find my ESR meter. But no hurry since I have to order MOSFETs from Aliexpress. I also await the arrival of the CCFL tester I ordered several weeks ago, so I'll be able to check everything.
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Re: Samsung Syncmaster T220 blown green fuse F301
Thanks.
You mean U302 or U303? Which, again, could point to a bad CCFL?Leave a comment:
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Re: Samsung Syncmaster T220 blown green fuse F301
OK, here they are...
Thanks....Leave a comment:
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Samsung Syncmaster T220 blown green fuse F301
I replaced some capacitors in this one a long time ago, and it was working OK until it again developed a "slow start" in cold weather, especially. Once it started, all would be well.
So, while it was trying to start, I've heard something getting fried inside, and after opening it, I found 4A green fuse F301 blown. Now, I'm measuring short across the C301 capacitor (1000uF/35V, it is good itself, of course).
MOSFETs in the inverter are STM8139 (U302 and U303) and have no visual sign of being burnt. I don't see anything else burnt, either.
Now, I downloaded... -
Re: LCD Philips 47PFL4606H/12 - power supply doesn't start, no voltages
If it is of any help to anyone, I'm repairing this board at the moment and found ZD907 (9V1) shorted.
Replaced it but no change. The resistance between pin 3 of the IC and live ground is very low as well - around 7.5 Ohms. So I'll order the IC and wait for it to arrive. Hopefully, it will work.Leave a comment:
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Re: Dell 2000FP Blank screen problem
None of those I've replaced had bulged tops, after all those are SMD types so bulging isn't easily visible, if at all, but if you use ESR meter you'll see how bad the situation is. You can expect that 70% will need to be replaced....Last edited by sinip; 10-18-2013, 08:55 AM.Leave a comment:
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Re: Dell 2000FP Blank screen problem
Start checking electrolytics capacaitors with ESR metere and replacing them. You'll have A LOT to replace. Then change EEPROM chip with the new one.Leave a comment:
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Re: Dell 2000FP Blank screen problem
Yes, several people to whom I've sent the dump reported their monitors as fixed. If you can't fin original EEPROM, you can as well use 29LV800 instead.
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Re: Dell 2000FP Blank screen problem
Thanks, I'll see if I can get it here.Leave a comment:
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Re: Dell 2000fp main board
If you still need the chip, or at least its content, read [url]https://www.badcaps.net/forum/showthread.php?t=10014&page=2[/url]Re: Dell 2000fp main board<br /> <b...4&page=2[/url]Leave a comment:
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Re: Dell 2000FP Blank screen problem
Ok, so I've managed to get another, WORKING Dell 2000 monitor and copied the content of the working ATMEL chip. Now I have the dump, which is 1MB big, and I can send it to anyone, free of charge. Just PM me with the e-mail address where you'd need the file.
I have also tried to re-program the chip in the broken one. Though programming goes ok, the monitor is still dead, so if anyone has one NEW Atmel chip to spare, I'd be more than interested to cover the shipping costs. The damn thing is unavailable here. Again, anyone interested...Leave a comment:
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Re: Dell 2000FP Blank screen problem
SMD fuse at the main board is located close to the power plug and IC marked Q708 which is next to coil with white "470" inscription at the top.
Don't worry if you don't have the fuse, you can always use THIN copper wire (one single wire from those flexible insulated conductors, as thin as possible) just to "jumpstart" the things. Of course, first check if something is shorted AFTER the fuse. Also, I think I should mention that I've replaced 30+ capacitors on the board I have, because they all were with high ESR,...Leave a comment:
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Re: Dell 2000fp main board
Did you manage to find anything? I'm having the same problem and looking for the same solution...
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Re: Dell 2000FP Blank screen problem
Thanks but I've got that file already. It is only 2K file, probably from one of 24C02 EEPROMs that are on the main board - IC402 and IC104. There's also 24C16 (16K) as IC125. But Atmel chip is 8MB one....Leave a comment:
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Re: Dell 2000FP Blank screen problem
Hello, I'll have to bump this one, hopefully someone will help.
I have Dell 2000FP that died in the same way, all LEDs are ON, can't be switched off. I've gone through the thread and excluded lamp inverter board as the possible cause. I've desoldered both transformers, and figured out the coils, and both are the same and good. Also no burnt transistors, fuse is ok. By the way the monitor died (artifacts on the screen, DVI input stuck in power saving mode, freezing controls, garbled image while changing resolutions on rebooting...Leave a comment:
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Re: New Members - please post your introductions here
Hello to all the members of Badcap forum from the Balkans, or more precisely Republic of Srpska (Република Српска). I've stumbled upon this forum while trying to figure out what's wrong with "infamous" Dell 2000FP LCD monitor. So I hope I'll be able to fix it with the help of other members here, and I've already saw few promising threads... Just to mention, I do electronics repair on time-to-time basis, everything from TVs to computers...
See you around.Leave a comment:
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