Aoc n2041s THUNDERSTRUCK

[CroTech]

Merry Christmas everyone

Have this one bugging me for a long time and finally got time to deal with it.
It was thunderstruck and the main fuse was blown, couldnt find it any shops
here so I shorted it with thin copper string. (marked on the picture)

Now, it turns on but keeps showing no signal input cable detected.
It has to be something with the logic board? Didnt check the VC regulators...
I could try to get better pictures if needed.

Thanks in advance

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

Nice pics of the table but the main board ones are useless.
What are the output voltages like on the power supply

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

Dim= 3,26v
on,off= 0,02v
n/p= 0,09v
gnd= 0v
gnd= 0v
5v= 4,98v
vol= 0,14v
mute= 0,02v

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

Hope this is any better, sorry for the images

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

Well 5v is good start - can I assume you had a working pc plugged in when it said no image.

[kc8adu]

Re: Aoc n2041s THUNDERSTRUCK

and the proper input selected?

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

kc8adu - it is just a monitor not a tv - and only has vga,
Its in wrong section just to trick us


If the monitor keeps the message for more than a few seconds it suggests , as you say, main board problem, test the VRs and any big diodes - a better picture of it might help

[freakaftr8]

Re: Aoc n2041s THUNDERSTRUCK

Yes, probably the surge went thru the VGA port from the PC and wiped out a fuse or possibly the Data IC on the mainboard in a similar fashion as HDMI processors get destroyed on TV mainboards from static electricity or surges.

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

Think this is a schematic - only snag is, its in chinese?
Anyway I think it says there is another fuse on the power supply.
In your picture bottom left corner near the connector there is a black rectangular box - is that a fuse? if so can you test it.

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

I just tested the whole thing again, PC pluged into logic board (showing picture on other monitors)... VRs checked fine.

It shows "no input signal" after a big AOC logo and then shuts down, turning green LED indicator into a yellow.

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

yup.... that is a fuse, and it´s not blown

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

Sorry forgot to post the link



How long does that take from on to led changing colour

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

well, not long, a copule of seconds... I would say five or more.
Cause if you doubt 2 seconds to black caused by the transformer, well I would have to say that even the transformer checked out fine.

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

Really need a good clear pic of the main board - not that we have much success
with repair if the VRs are good- could be any one of those little switching transistors

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

The best I could get with my old SONY DSC V1

[tom66]

Re: Aoc n2041s THUNDERSTRUCK

That is power board, main board has video input on it.

[selldoor]

Re: Aoc n2041s THUNDERSTRUCK

Ok - That is the power supply it was main board (logic) pictures I asked for.

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

Sorry I can´t do any better. If I take photos closer than it becomes blury
even if I turn macro ON.

And back to square one, put the parts back together and now the monitor
won´t turn on at all it´s like the power is cut off completly.

[CroTech]

Re: Aoc n2041s THUNDERSTRUCK

Anyone?

[tom66]

Re: Aoc n2041s THUNDERSTRUCK

I suspect the fault involves that main chip there -- unless you could find a replacement it's probably not fixable.