iiyama e2202wsv prolite, stop after 5 sec

[perette]

Hi everybody

I have a problem that seems to be common on this monitor (same as a adepia tgl 2020 (service manual there) and AOC TFT22W90PS, plus many other)

The screen powers on, display a "no cable" if no cable connected and then turn to black with the led to orange. And if i push the power button, it switches of and can restart doing the same again. I do not see any image.

I haven't find a usable answer on the web (maybe I'm not searching the right way), I ask your help to try to resurrect the monitor.

I've suspected the PSU (715g2510-1) but no caps damaged (visibly), not trace of burn.

I've tried to test some key components (as recommended in a previous subject there)

What can i try to find were the problem comes from.

thanks (PS, I can play with it only the week end, so this can take a little time)

[RethoricalCheese]

Re: iiyama e2202wsv prolite, stop after 5 sec

For me it seems like controllerboard (where the input cable connects to) is problematic.
Some say that adding a resistor somewhere could help.

Maybe someone smarter than me knows where to put that resistor and what the resistance should be.

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

hi the boss

looking at the service manual of the adepia TGL 2020A (a clone of the iiyama) they explain that it can be the main board (folowing your recommendation).
I've tried to test it according to it, but getting no clues on it.

the board s a 715G2573-2.
I got a OSD message when switching it on (different message if a cable is or not connected), but a off (and orange led) after 5 seconds.

if putting a resistor can help to decide if it's dead or not...

[budm]

Re: iiyama e2202wsv prolite, stop after 5 sec

It sounds like SAMSUNG with EEPROM problem, see if you have this EEPROM on your main (logic) board.
https://www.badcaps.net/forum/showth...155#post246155

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

Hi Budm

I see your idea.
Maybe yes, the same issue.
The "main board" is a 715G2573-1.
I've got one from a 19" screen but a version -2, and it does not work on the 22" I have.
its behavior is the same (goes to orange led after 5 sec), but no OSD message. the short time when the screen is on shows white background and some vertical stripes. the eeprom on the board contains another code I guess made for the 19".
But all components are the same so..

Now on the 715G2573, the eeprom is not he same as the one you mentionned.
So I cannot try the same solution.

I'm still puzzled between the main board "saying" that there is no signal ans switching the power board off and a bad feedback to the system that switches it off for protection.

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

Hi everybody.

actual status : I've changed all caps on the power supply. even if not visibly damaged.
outcome : now I see a picture on the screen and it does not go to stand by (orange led).
BUT the backlight turns off after 2 seconds

As I've changed all caps (low esr ones), I've check CCFl tubes, but none is dead.

On the back of the board to IC labelled 9945 AA7LDA seems to had some heat traces around. could this be the reason of the 2 secand to black?

any expert adive?

thanks.

[selldoor]

Re: iiyama e2202wsv prolite, stop after 5 sec

any expert adive?

thanks.

Hi - read it as any expert aLive

Figure you mean advice, not that I am an expert.

When the picture goes black can you still make out what should be on the screen perhaps shining a flashlight on it? - Set it up with a vivid picture that you can easily recognise. and when it goes black does the standby stay green.

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

Hi Selldoor

Oups, little keyboard failure..

Yes of course, advice is better.

The image is visible on the screen, it's only the backlight that goes of.
the led remain blue (not green on this one).

To help on the heated components. here's a picture of the unit.
Q802 and Q803 are surrounded by heat traces (both side of the board)


thanks

P.

[selldoor]

Re: iiyama e2202wsv prolite, stop after 5 sec

They do run hot - but may be ok.
Have you checked the Inverter transformers Secondary Windings ( Large black Rectangles)
On the bottom board picture one is at the top right has six pins on one end and pins 7 and 8 on the other end. Set your multimeter on ohms 2000 and test across those pins 7 & 8 on both transformers.

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

467 on one, 465 on the second one.

looks like it's not there.

P.

[selldoor]

Re: iiyama e2202wsv prolite, stop after 5 sec

Near q802 there is a label F801 That suggests a fuse but it is a zero resistor.
Can you test it - meter on ohms 200 There is another jr802 may as well test that as well

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

displays a zero resistance.
the multimeter I have is a bit short to read low resistance values.

PS : (if it helps) the schematic of the board can be found in my first post pages 26-27. different monitor brand, but same board.


P.

[selldoor]

Re: iiyama e2202wsv prolite, stop after 5 sec

0.00 is good - same as putting the probes together?
I have to go out for an hour or so but will look at the scheme later.
Does the scheme have the part numbers of the q 802/3 you mentioned if not can you post
a close up picture clear enough for me to read the numbers. (I cant find anything for the number you quoted)

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

hi Selldoor

Thanks for you help, there is no emergency.

I've attached schematics and a list of components.

I can just mention that, when I see the image and backlight is on, the backlight is not really powerfull (same as the spare CCFL I've used to test).

best

P.

[selldoor]

Re: iiyama e2202wsv prolite, stop after 5 sec

Ok the q802/3 mosfets are AM9945N data sheet here
http://www.analogpowerinc.com/datash...=DS_AM9945N_F1

A quick test for shorts is in this guide by retiredcaps
https://www.badcaps.net/forum/showthread.php?t=10419 start at post 19 -power off for tests.

[perette]

Re: iiyama e2202wsv prolite, stop after 5 sec

Hello selldoor

I'll test it probably tomorrow.

thanks a lot

P.