This was ever resolved?
I have a 940T with the same PSU. Power led brights in a beautiful blue color, but no image or backlight. Also, I can't get V readings on the three bloated caps on the pic. I have replaced ALL the caps in the board (except the little one on the inverter side. As soon as I get image, I'll mess with that.
There are 10 kind of people in this world: those that understand binary, and those who don't.
ASUS ROG Maximus IX Code
Intel Core i5-7600K 3.8GHz
16gb GSKILL TridentZ RGB DDR4-3200
1 M2 SSD + 2 WD Blue 1TB (Mirrored)
Windows 10 Pro x64
GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
Hello alex,
I have not got a board with me, but from what I can see , there is a red fuse behind A/C connector,cylindrical in shape,but the one you may be after is possibly alongside of the big filter cap that is laying on ita side, its black and look like a diode or inductor,as I said I cant see properly from pictures,just check it out.
bob
This was ever resolved?
I have a 940T with the same PSU. Power led brights in a beautiful blue color, but no image or backlight. Also, I can't get V readings on the three bloated caps on the pic. I have replaced ALL the caps in the board (except the little one on the inverter side. As soon as I get image, I'll mess with that.
Problem solved. While changin the fuse, checked the resistor at its side.
Resistor under the white stuff was badly/cold soldered.
Removed solder, resoldered, and now power flows in all the board.
And for the V readings, one of the jumpers was also badly soldered. I reflowed the solder on it, and problem solved. Too bad that after the LCD came to life it has a green line (like 2~3 pixels wide) across the right side.It has been narrowed down to the LCD Panel itself, as I have another unit and the problem moves if I exchange the lcd panels...too bad, excellent image and no damage to the screen ...
Attached Files
There are 10 kind of people in this world: those that understand binary, and those who don't.
ASUS ROG Maximus IX Code
Intel Core i5-7600K 3.8GHz
16gb GSKILL TridentZ RGB DDR4-3200
1 M2 SSD + 2 WD Blue 1TB (Mirrored)
Windows 10 Pro x64
GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
This was ever resolved?
I have a 940T with the same PSU. Power led brights in a beautiful blue color, but no image or backlight. Also, I can't get V readings on the three bloated caps on the pic. I have replaced ALL the caps in the board (except the little one on the inverter side. As soon as I get image, I'll mess with that.
I Have a lcd with the same power board but it doesn't power at all I checked the voltages every where that i can see no readings at all even this big 1000uf 450v cap doesn't get any volt.can anyone here please help me to figure out anything thank you.really sorry if i pooped up the question in wrong location.
If you dont get green LED light up, check that red cyndrical fuse behind A/C connector, also fuse in power point plug.and the bridge rectifier
bob
Thanks for the reply bob,red fuse was blown as youve said and i replace that but it keeps happening again.any other ideas?sorry my knowledge it very limited thanks
Thanks for the reply bob,red fuse was blown as youve said and i replace that but it keeps happening again.any other ideas?sorry my knowledge it very limited thanks
If the fuse keeps blowing something is drawing too much current. Possible suspects are (in order) the switching transistor (on the large heatsink near the top of the large cap), the bridge rectifier (black rectangle near the bottom of the large cap), and the large cap itself. Use and ohmmeter and check each one out.
PlainBill
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.
If the fuse keeps blowing something is drawing too much current. Possible suspects are (in order) the switching transistor (on the large heatsink near the top of the large cap), the bridge rectifier (black rectangle near the bottom of the large cap), and the large cap itself. Use and ohmmeter and check each one out.
PlainBill
Thanks PlainBIll Just checked the board carefully and found that green colour part in between cylindrical fuse and blue capacitor has burnt(just below the yellow cubic) I really appreciate if someone can name them for me and get the value of that green thing looks like a resistor to me.Thank you guys.
Thanks PlainBIll Just checked the board carefully and found that green colour part in between cylindrical fuse and blue capacitor has burnt(just below the yellow cubic) I really appreciate if someone can name them for me and get the value of that green thing looks like a resistor to me.Thank you guys.
Post a pic of your board , of the area with the suspected bad component.
There are 10 kind of people in this world: those that understand binary, and those who don't.
ASUS ROG Maximus IX Code
Intel Core i5-7600K 3.8GHz
16gb GSKILL TridentZ RGB DDR4-3200
1 M2 SSD + 2 WD Blue 1TB (Mirrored)
Windows 10 Pro x64
GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
I have repair many these boards from 740N too. Always three 820uF/25V CapXon GL 105 caps and one fuse 3A (axial green) after them. They are all on +13V power line which supplies inverter board.
In primary side there is an Fairchild smps pwm controller FSDM0565R.
Always too, on solder side of pcb, we can see that power copper lines +13V have some more yellow color than rest of board (that is green) and conlusion is that there was some over current flow.
Caps are bad quality for sure but there may be also some overvoltage on secondary side caused by iregular state of whole smps, even overvoltage from power line 220-240V.
Discovering right causes can be painful and ready for academic discuss.
Best way is to test new board with over voltage, high ambient temperature, open and short output circuits etc.
Caps and fuse aren't cheap and can't be problem, but when main A/D board or even lcd panel is dead also (on some other models) it can be a problem to judge whole case, as i have some. https://www.badcaps.net/forum/showth...6020#post66020
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