Hi!
I have an Iiyama ProLite E481S (Model name PLE481S-S1S) flat screen connected to my laptop using a VGA cable. The screen has been working fine for 3 years. Now it fails.
Everytime I switch the flat screen on, it goes dark after a second. The power LED, however, stays on (constantly blue, not flashing) all the time.
This posting contains 12 MB of photos to give you as much (zoomable) information as possible. Please wait for them to load and resize automatically (somehow they start loading in fullsize to be resized after a few seconds) to make your reading easier.
The flat screen was tested using two different laptops to rule out problems originating from the laptop.
The screen comes back to life for one second when I
* change its resolution in Windows
* push its "Input" button (it looks for a connection on the DVI port, doesn't find any and then switches back to the VGA connection from my laptop)
I have read some message boards where people had similar problems and I have thus exchanged some parts. I have already successfully fixed 4 BenQ flat screens where the culprits were the capacitors, but I can't get this Iiyama E481S to work again.
To change the capacitors, I followed this how-to:
http://bololo77.bo.funpic.de/e481/
Additional ideas came from these threads: (though some of the other posters had --flashing-- power LEDs, not a steady one as I do)
https://www.badcaps.net/forum/showthread.php?p=49391
http://forum.eserviceinfo.com/viewtopic.php?t=23775
But as you can see from the pictures below, the L101 and C905 joints look fine on my screen.
This is what the flat screen mainboard looked like before I started changing components:
I changed the following components:
- two capacitors: C914, C915 (is now Panasonic EEUFM1C102)
- four transistors: Q209, Q210, Q211, Q212 (was D1691, is now C5707)
Note that the two capacitors did not look damaged. I changed them anyway, just to be sure.
A brownish color can be seen where the old transistors were soldered on the main board. That color had already been there when I opened the screen
for the first time, so it must have accumulated in the 3 years of operation.
The new transistors were smaller than the old ones so I added some metal heat sinks to each transistor for improved heat dissipation. The heat sinks are fixed to the transistors by heat-resistant glue drops in each corner and there is a fine layer of thermal heat sink paste between the heat sinks and the transistors.
Their soldered joints look not nearly as neat as the capacitor's joints. I measured them and there is a working contact from the transistor pins to the PCB, though.
This is what the mainboard looks like now:
You can download a ZIP file containing all of these pictures (43MB, high-res pics) without my red markups from
http://rapidshare.com/files/43191187...vember2010.zip
Since the screen's faulty behavior did not change, some other (not yet identified) part is probably damaged. Could anybody help? Did I do something wrong, or do you have any new ideas how to get the screen running again? If you need other photos or details, please let me know.
Thanks in advance!
Andreas
I have an Iiyama ProLite E481S (Model name PLE481S-S1S) flat screen connected to my laptop using a VGA cable. The screen has been working fine for 3 years. Now it fails.
Everytime I switch the flat screen on, it goes dark after a second. The power LED, however, stays on (constantly blue, not flashing) all the time.
This posting contains 12 MB of photos to give you as much (zoomable) information as possible. Please wait for them to load and resize automatically (somehow they start loading in fullsize to be resized after a few seconds) to make your reading easier.
The flat screen was tested using two different laptops to rule out problems originating from the laptop.
The screen comes back to life for one second when I
* change its resolution in Windows
* push its "Input" button (it looks for a connection on the DVI port, doesn't find any and then switches back to the VGA connection from my laptop)
I have read some message boards where people had similar problems and I have thus exchanged some parts. I have already successfully fixed 4 BenQ flat screens where the culprits were the capacitors, but I can't get this Iiyama E481S to work again.
To change the capacitors, I followed this how-to:
http://bololo77.bo.funpic.de/e481/
Additional ideas came from these threads: (though some of the other posters had --flashing-- power LEDs, not a steady one as I do)
https://www.badcaps.net/forum/showthread.php?p=49391
http://forum.eserviceinfo.com/viewtopic.php?t=23775
But as you can see from the pictures below, the L101 and C905 joints look fine on my screen.
This is what the flat screen mainboard looked like before I started changing components:
I changed the following components:
- two capacitors: C914, C915 (is now Panasonic EEUFM1C102)
- four transistors: Q209, Q210, Q211, Q212 (was D1691, is now C5707)
Note that the two capacitors did not look damaged. I changed them anyway, just to be sure.
A brownish color can be seen where the old transistors were soldered on the main board. That color had already been there when I opened the screen
for the first time, so it must have accumulated in the 3 years of operation.
The new transistors were smaller than the old ones so I added some metal heat sinks to each transistor for improved heat dissipation. The heat sinks are fixed to the transistors by heat-resistant glue drops in each corner and there is a fine layer of thermal heat sink paste between the heat sinks and the transistors.
Their soldered joints look not nearly as neat as the capacitor's joints. I measured them and there is a working contact from the transistor pins to the PCB, though.
This is what the mainboard looks like now:
You can download a ZIP file containing all of these pictures (43MB, high-res pics) without my red markups from
http://rapidshare.com/files/43191187...vember2010.zip
Since the screen's faulty behavior did not change, some other (not yet identified) part is probably damaged. Could anybody help? Did I do something wrong, or do you have any new ideas how to get the screen running again? If you need other photos or details, please let me know.
Thanks in advance!
Andreas
Comment