AES hardware problem, help !

karlito748 · Jan 27, 2009

Hi all, and thank for this forum, it's a super knowledge base for me.
I've got a problem with an AES base's friend.
it can't boot, i've this screen

.
it's a NEO-AES3-3.
if somebody can help me, thank !! otherwise, thank to !!

karl.

MKL · Jan 27, 2009

What are the specs of the power supply you're using? If it's SNK official it should be a NEO-POW 3 or PRO-POW E. If it's a generic brand the output needs to be at least 9VDC (it can also be higher, like 12VDC) with negative tip polarity. A PAL Megadrive PSU will also work.

What's the picture like when you power it with no cart inserted?

Does it have a unibios? If so power it while keeping ABD pressed on the P1 controller and see if the picture remains black and flashes every 1-2 seconds or if some message appears.

karlito748 · Jan 28, 2009

Hi MKL and thanks for you interesting.
I've this screen (or similar) with or without game and i use a sega power.
I think the motherboard c'an't boot but why ?i don't know.
is it the Z80 or an other chipset ? i've got no sound too.

It's for a friend, so if i fix it, i think he'll be very happy.

Karl.

channelmaniac · Jan 28, 2009

I had an AES that did something similar looking on the screen. It had a bad trace going into the Sony encoder chip near the A/V jack.

karlito748 · Jan 29, 2009

Thank you channelmaniac,
i've look around the Sony encoder chip but it's ok.
do you think it can provide by it ?
karl.

Hewitson · Jan 29, 2009

karl: Have you checked continuity of all pins of encoder with a multimeter?

karlito748 · Feb 3, 2009

Hi hewitson, yes the continuity is ok.
i don't know why but i think the problem is not the video signal.it seems to not booting....an idea ?
thanks.
karl.

channelmaniac · Feb 3, 2009

Plug in a pair of headphones and see if you get audio.

If all you get is a "click click click click" sound then the board is dead - stuck in watchdog.

If you get sound like it's playing a game then you have a problem in the encoder section.

RJ

terchan1 · Feb 14, 2009

I have the same problem. The sound is ok but the image is flashing.....
How to check the encoder section? I have checked all connections and solidering are ok....

Thanks

Hewitson · Feb 14, 2009

Flashing? Sounds like you're using it on an LCD/Plasma that doesn't like the refresh rate. If so, try it on a CRT.

terchan1 · Feb 14, 2009

it works now....!! thanks

karlito748 · Mar 20, 2009

Hi all, excuse me but i had lot of works......but my problem is the same.
I try to plug an hearphone and i have no sound (no clic clic...), so i f you'v got an idean, channelmaniac or else .....thanks.
Karl.

Xian Xi · Mar 20, 2009

Turn up the volume on the slider.

Also that screen looks like your PSU isn't strong enough.

karlito748 · Mar 21, 2009

thank xian, i try with a strongest Psu (9v-1.5A) and i have the clic clic of the death :annoyed:

have i a last chance to repair it ?
thanks.
Karl.

Xian Xi · Mar 21, 2009

My AES had that same problem with the screen scrambled and no sound when I used a 9v 1.2A PSU, when I used a 9v 1.6A and a 9v 2A PSU it worked perfectly.

channelmaniac · Mar 21, 2009

Click of death can be anything that causes the main CPU to not read the BIOS ROM and run properly. It usually has these causes: bad BIOS chip, bad trace, or bad Work RAM.

If you don't feel like tackling it yourself, contact MKL. He's in Italy and repairs MVS/AES systems on that side of the world.

RJ

AES hardware problem, help !

karlito748

n00b

MKL

Basara's Blade Keeper

karlito748

n00b

channelmaniac

Mr Neo Fix-it

karlito748

n00b

Hewitson

Metal Slug Mechanic

karlito748

n00b

channelmaniac

Mr Neo Fix-it

terchan1

n00b

Hewitson

Metal Slug Mechanic

terchan1

n00b

karlito748

n00b

Xian Xi

JammaNationX,

karlito748

n00b

Xian Xi

JammaNationX,

channelmaniac

Mr Neo Fix-it