IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

[GreenOne_Mk]

Hi to All Members and Veterans on Badcaps Have trouble repairing and Reviving AU5131DT LCD monitor hope to give me advice how to bether isolate the problem.This is the common simtoms
1.The monitor power is present blue led on panel is showing Hi voltage led backlights is present and constantly on see the white light in background but no picture tried to fing service manual from internet for AU5131DT no luck
Opened the lcd monitor
These are the components
1.Powerboard found capacitors on secondary dc side c901 c902 c903 25v 820uf
microfarads buldged one was leaked replaced them with 820uf Panasonic FC low esr caps 25v still no picture see backlight comming on and staying on alltime no check signal or picture connected cable to pc
Powerboard model iiyama AU5131DT PSU Power Supply Board 210R114-01
visyally all ok
2.Inverter Board iiyama AU5131DT Inverter HIU-518 NA19002-4232
3.Motherboard
Click to view larger image and other views
iiyama-AU5131DT-DVI-USB-Main-Board-T950V081-210R121-01
iiyama-AU5131DT-DVI-USB-Main-Board-T950V081-210R121-01
Have one to sell? Sell it yourself
iiyama AU5131DT DVI USB Main Board T950V081 210R121-01
iiyama AU5131DT Controller Board GCMK-M1X
Inverterboard and mobo looks like new no visuble damage can somebody help me where to look for the peoblem and how to measure mobo power and inverter board power still cant find service mannual to try to repai
could not say it is inverterboard see backlight on all time guess it is some relay or something on motherboard hack everything looks ok and also how to check power on powerboard motherboard or inverterboard happy to learn

Thank You for any advice

[budm]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

Can we see good high resolution of YOUR boards? Also pictures of the whole back side so we can see all the boards and how they are connected together, especially the LCD panel.

[GreenOne_Mk]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

Ok will send hi res pics of all boards and how they are connected in mean time cople of pics from powerboard alone just to see the power connectors and please note the caps silverones 25v 820uf c920 c922 c923 the first was leaked in bottom and other two were bulged replaced those three all toghether with Panasonic FC 25v 820uf caps by the way thanks budM for advice on capacitors replacement and now you can see the unknown caps manifacturer Thanks
also will need to measure voltages on power board like 5vstby or 12 16 vdc wich I cant see pin diagram anywhere on powerboard
will send all pics connected they are 2 4 pin connectors on Powerboard just as one u see on pic 2 they are both connected to logic motherboard
will give clearer pics

[budm]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

I suspect the problem either in the main/logic board or the T-CON board (https://www.badcaps.net/forum/attach...7&d=1466529127 I need better pictures of this board to locate the SMD fuse to check the DCV on it) not getting the 12VDC from the main board (http://microdream.co.uk/iiyama-au513...l#.V2mrEvlVhBc)

[GreenOne_Mk]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

Hi BudM will send better hi res pic from main logic board can you give me a pic how typical smd fuse looks like on lcd monitor so I can quickly locate and also how can I measure it with multimeter to check the vdc or if it has any voltage to give u a clue and to locate the problem so I can search and give better pic of top and back view of logic board also I ll try to open the tcon board so you can see it also as far as I can tell you the power board looks like new even I changed those capacitors with 25v Panasonic Fc as you mentioned
My question is since I cant find any diagram on main board abouth the connectors and what voltages they are how can I measure the main board to check if 5vdc or 12v dc is gooing i logic board I guess I have to give you better pics to figure out the problem I am not so much exp im repairing lcd monitors but i read from topcs that logic board sends signal to inverter board and power board to start the t con board and its the t con board that shows data on the monitor however will swnd more pics tommorow from everything so we can resolve the problem
1.I am gonna send better pics of power board and logic board and also how they are connected together with inverterboard so U can Help me in identifying pins and how to measure it so we can locate the problem together
Thank you so Much hope that u can send me some pics of the smd fuse to locate it on the logic board wait for fast responce

[budm]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

See pictures.
Pictures provided by shopjimmy.

[GreenOne_Mk]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

All right BudM I have to open the whole monitor back and take out t-con board which is covered in 6 screws and do better hi res pics and try to find smd Fuses and their values and also to give u a better hi res pics from all boards give me a day I send them to you also it is very difficult to measure anything since I dont have expirience but I am willing to learn it ant try to isolate the problem I have a question for u since I can see on the back of the lcd monitor the ccfl tubes are constantly on does that mean that the power board is giving voltage to the inverterboard so we can say that is notghing wrong with the inverter board.I also suspect that is something wrong with T-con board too.Ok another question If I find the fuses and their value and check the voltage DC on the fuses and is not getting any power does it means that after replacing the t-con board will automaticlly send signal to powerboard to start the inverter board and power board since as you can see from the pics of the powerboard everything is new nothing is burned or damaged even replaced those caps od secondary side tested fuse on powerboard is ok Bridge rectifier and diods are all ok tested them ok let me find the fuses so we can continue the reson is that the logic board is all ok like new nothing burned vissually I didnt check the T-con Board cause I wasnt able to open it But I ll do now
Also I wanted to ak you abouth something since U have a lot of exp in repairing lcd and tv on the iiyama inverter board the board itself has 6 rectangular shape I would say transformers 3 on top and 3 on bottom of the same side of the board They have 2 legs on one side and 4 on the other there is some markings HIM I guess they are transformers cause they are connected to plastic connectors that go to CCFL lights can I measure those whith multimeter without any power and how to measure them with multimeter can I do diode check to check that are ok the 2nd pic that I show u from the first post
Ok will send the pics
Thank you

[dick_barton]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

If your backlights are on then the inverter board is fine.

[budm]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

The main logic board sends the BL-ON and Dimming control signal to the inverter circuit when power switch is activate and the monitor is getting the Video signal from running PC otherwise the monitor will be in standby mode (backlights OFF).
The main board also sends PS-ON signal to run on the rest of the power supply sections, it also send the switched 12V to run the T-CON.
If the fuse is blown on the T-CON, it can be just bad fuse that failed during the inrush current when Voltage is applied to the T-CON, or the fuse is blown due to shorted circuit in the T-CON or in the panel.
backlights are just the light source so you can see the image on the screen when the main board, T-CON board, and the LCD panel are OK.

[budm]

Re: IIYAMA AU5131DT LCD Monitor No Picture Need Help!!!!

All right BudM I have to open the whole monitor back and take out t-con board which is covered in 6 screws and do better hi res pics and try to find smd Fuses and their values and also to give u a better hi res pics from all boards give me a day I send them to you also it is very difficult to measure anything since I dont have expirience but I am willing to learn it ant try to isolate the problem I have a question for u since I can see on the back of the lcd monitor the ccfl tubes are constantly on does that mean that the power board is giving voltage to the inverterboard so we can say that is notghing wrong with the inverter board.I also suspect that is something wrong with T-con board too.Ok another question If I find the fuses and their value and check the voltage DC on the fuses and is not getting any power does it means that after replacing the t-con board will automaticlly send signal to powerboard to start the inverter board and power board since as you can see from the pics of the powerboard everything is new nothing is burned or damaged even replaced those caps od secondary side tested fuse on powerboard is ok Bridge rectifier and diods are all ok tested them ok let me find the fuses so we can continue the reson is that the logic board is all ok like new nothing burned vissually I didnt check the T-con Board cause I wasnt able to open it But I ll do now
Also I wanted to ak you abouth something since U have a lot of exp in repairing lcd and tv on the iiyama inverter board the board itself has 6 rectangular shape I would say transformers 3 on top and 3 on bottom of the same side of the board They have 2 legs on one side and 4 on the other there is some markings HIM I guess they are transformers cause they are connected to plastic connectors that go to CCFL lights can I measure those whith multimeter without any power and how to measure them with multimeter can I do diode check to check that are ok the 2nd pic that I show u from the first post
Ok will send the pics
Thank you

You should read these:
https://www.badcaps.net/forum/showpo...56&postcount=1