Archive for the ‘Sega’ Category

Sega Mega Drive 2 Switchless MOD

Donnerstag, Februar 18th, 2010

Inspired of the great site mmmonkey and sebs great code for the Sega Saturn, I will use the PIC 16F630 in a Sega Mega Drive 2 /Genesis 2.

You are in need of a PIC 16F630 with sebs code, some wire, two resistors 220Ohm and a DUAL Led red/Green.

If you can’t do it yourself, we can take care of your Mega Drive 2 / Genesis 2

At the Mainboard you have to cut 3 circuit board tracks.

Cut the fist circuit path from pin 46 and solder the pink wire at the right site of the cut.

Pin 46 at the SMD2 works for 50/60Hz switching. GND= 50Hz and 5V = 60Hz

smd2_switchless_cut_50,60hz

Cut the second cirquit path to Pin 107 at the marked place and solder the purple wire on the upper Side.

Pin 107 selecting japanese Mode (GND) or english Mode (5V).

GND at Pin 78 will Reset the Sega Console.

So you have to cut the 3rd cirquit path to Pin 78, see marked place and solder a white wire to the left site of the cutted path.

smd2_switchless_cut_jap,engl,-reset

Here you can see the complete wiring including PIC

Pin 01 Red (5V)

Pin 05 Resistor 220Ohm -> red site of the LED

Pin 05 Resistor 220Ohm -> green site of the LED

Pin 09 purple (jap./engl switching)

Pin 11 white (Reset Signal of the SMD)

Pin 12 pink (50/60Hz switching)

Pin 13 grey (Button Signal)

Pin 14 black (GND)

smd2_switchless_pic

Now you have to remove LED1 and replace it with the Duo LED 5mm

smd2_switchless_pic_led

After this you have to do some mechanics. Rasp the white pvc until the 5mm LED is fitting.

cover_1

cover_2

Have Fun

Usage of Sebs CODE:

You can change the Modes via pressing the reset Button of the SMD2.
If you press the reset button very short -> The Sega Console will do a reset

If you press the reset button around one second -> The console swaps between 50Hz and 60Hz.

If you hold the reset button for more than one second -> The console will toogle:

Led red Japan Mode (think of the red dot in the japanese flag)

Led orange USA Mode

Led green Europe Mode

Here you can see a little video, how to use the switchless mod.

Sorry for my english, its my first public english speaking ;-)

http://www.youtube.com/watch?v=8N3OnxkShcQ

Sega GameGear Audio & Display Fix

Mittwoch, Dezember 2nd, 2009

I received a GameGear without sound and the contrast of the handheld was terrible.

So I used a searchmachine and found the following sites:

AudioFix

For Display troube

If you don’t want to make it yourself, we can take care of your gamegear

Part  #1 Audio Fix

No Audio :-(

No Audio :-(

bad capacitor

bad capacitor

In most cases it it this capacitor 47uF 6.3V (C7)
Please change 47uF 6.3V (C5) too, because if you make use of a headphone.

If you can’t find it with 6.3V you can make use of one with higher voltage.

replaced, audio is working great again

replaced, audio is working great again

Audio Amplifier Board

DESIGNATOR VALUE
C1
C2
C3
C5
C7
100μ 6.3V
100μ 6.3V
100μ 6.3V
47μ 4V
47μ 4V

Part# 2 Display Fix

The display was dark, the contrast wheel didn’t help, so I changed every elko on the mainboard.  After this the picture was brighter and the contrast wheel works good again.

The original capacitors have some clue under it.  Desolder one side of a capacitor and move it a litte bit. Then you can desolder the other site.

change the marked capacitors

change the marked capacitors

change the two red marked

change the two red marked

when soldering the new ones, look for space in the marked area

when soldering the new ones, look for space in the marked area

when soldering make space at the marked areas. It is needed when closing the gamegear.

Mainboard

ONE ASIC GG TWO ASIC GG VALUE
C68
C43
C45
C55
C54
C48
C49
C1
C4
C14
C48
C11
C31
C49
C35
C45
C44
C38
C39
C1
C3
C14
C48
-
100μ 6.3V
22μ 6.3V
4.7μ 35V
0.47μ 50V
0.47μ 50V
68μ 6.3V
100μ 4V
33μ 6.3V
10μ 6.3V
10μ 6.3V
10μ 6.3V
10μ 6.3V

Update: Bad Contrast Fix for other GameGear Revision

Here you can see all capacitors to be replaced.

Responseable for the bac contrast are: C54,C55,C48,C49 (blue marked Area). But its better to replace all to be sure.

gg1

gg_2_left

gg_3_right

gg_4_replaced_left