Simple repair.
The controls were erratic. Using the input test in the diagnostic menu I could see 3 buttons and the right direction were being activated together.
A visual inspection quickly pinpointed the fault. One of the input resistor banks was partially desoldered and cracked.
Trying to remove the IC myself proved quite a task but removed the two parts and slotted in a 4.7k resistor array from a scrap board. Now the inputs work fine.
Just need to find a sound board for it now.
First repair from the lot I recently got. Sega STV motherboard with Die Hard game.
When booted up with no game cartridge the board passed all it ROM and RAM tests. With a cartridge inserted the board crashes after the copyright screens. All the cartridge tests also came up as being good.
There is a developers test menu that is accessed by holding the TEST button down on power up of the board, this gives you access to a whole host of extra tests, one of them being a Sub-CPU test. Running this test flagged it up as being BAD and the board locks up.
If I pushed down on IC2 (this is the Sub-CPU, an SH2) the board would pass its test.
This fault seems to be very common on STV motherboards and is easily fixed by reflowing solder on all the pins on the SH2 processors. I did both of them for good measure and the board now passes all its tests and the game boots up.
Not played this game before and its actually quite fun, like a mashup of Virtua Cop, Virtua Fighter and a little bit of Shenmue thrown in for good measure, it would make sense as the STV hardware is based on the Sega Saturn (or vice versa?).
Got a box of broken boards from a guy on the Jamma+ forums.
Included are:
Rastan Saga – white screen
Hot Shots Tennis – constantly resets
Mortal Kombat – messed up controls
Seibu Soccer (Seibu) – no sound, very low
Karate Champ – non jamma pinout, looks clean though
Taito F3 Motherboard – no game to test it
X-Men Vs Streetfighter – Working
Sega STV Titan Motherboard + Die Hard Arcade – games dont load
Two Crude – all the ROMs are missing
Street Fighter 2 – bootleg – intermittently working
Another Street Fighter 2 bootleg – Dead, all roms and rams are dead, not worth fixing
The X-Men vs Streetfighter board is fully working and even has a working battery.
The SF2 bootleg is intermittently working, looks like the M5 bootleg.
All the other boards have the fault the guy stated.
Im pretty pleased with this lot.
While I had the Fluke opened up today, thought I might as well install the upgraded ROMs, not sure why just felt the need to.
The ROMs that are available online for version 3A are doubled up into 3 x 16k files, to be installed I needed to split these files and match them up to the originals.
Here is the .ZIP file with all the split ROMs labelled properly.
The Naomi has a 0.1F super capacitor on board labelled C29, in between the button cell battery and the 8 pin DIP labelled 315-6188. This capacitor is a usual suspect on a broken board as it is prone to leaking and damaging the traces to the serial EEPROM. If you own a Naomi board (not sure if it applies to the Naomi 2) you should check the condition of this cap and replace it.
The capacitors can be ordered from the link below:
Mouser