MV1-FZS no sync and bad sound

I have NEO-GEO MV1-FZS with these problems:
1.The picture is like no sync
2.The sound sometimes is too loud sometimes too quiet

The cartridge is work fine on the other mobo,the game is star,I can see that picture is changing but I can's see nothing ofcourse,because the problem like no sync don't allowed me

I clean the JAMMA connector,but with no luck

Any ideas what can it be?What I must to check/look?What I must to do


Thank you

OK.
I read these guides:

http://www.neo-geo.com/forums/showthread.php?t=179241
http://www.neo-geo.com/forums/showthread.php?t=121136

but I cannot locate:

74LS32
NEO-I0

I have:

NEO-B1
NEO-D0
NEO-C1
NEO-E0
NEO-F0


and two just LS32(not 74LS32) one is U1 other is U13

I need help realy

I replace R101 and R471 because the have bad.R101 is ok 100omh,but R471 is 255omh.When I desolder it and gauge the place where must be R471 show 550omh,this is wrong because it must be 0omh.So my question:
Where is come these 550omh from?
What I must to check?

http://www.picvalley.net/v.php?p=u/1938/13966852033063817031262943868KdeB97jCkOMfiSVuGNPe.JPG



One more thing,after remove the black plastic case I see that from the backside of the cartridge slot have this:

http://www.picvalley.net/v.php?p=u/1768/8302631247549677261262943870UweZoes2gFlvnFaSfwCm.JPG

Looks like someone made repairs before me?Can you tell me what exactly is done?
As you see I made two circles-one red and other white

The red one I see like corrosion between solders
The white one- the two solders are connected

What I must to do in these case?
What can you recommend me?
Is these corrosion and the two connected solders(white circle) have connection about the bad sound?










Please help

OK.So no one want to help
I have a favor to every one-If anyone have a scheme of NEO-GEO MV1 board,please give me.I think I will have much success if I know what and where is connected


Thank you

Keep in mind that the FZ has a strong sync signal that some monitors don't like. Put a pot inline on the sync and adjust the signal strength.

I have 3 MV1-FZ boards ,and they work fine

Can you tell me where is located 74LS32 because I have only two LS32


http://www.boredstu.com/neogeo/hardware/mv1fz/slot1fzpcb1large.jpg

The R471 should be a 470ohm.

Yes I know that but it shows 225ohm with replaced R471,without R471 shows 550ohm(between to points where solder),this is the problem.Where comes these 550ohm,because must be 0ohm
Some chip?

Stop.

101 = 10 + 1 more 0 = 100 ohm.
471 = 47 + 1 more 0 = 470 ohm.

Read them with a meter in circuit and you might not get what you expect. To truly read resistor values, you have to read them with one leg out of the circuit. This is difficult to do when working with surface mount parts.

When reading in circuit (which is what you are doing when you put the probes on the solder points for the resistor) you are not only reading the resistor, but reading the resistance of the circuit it is in. This includes reading through chips, other resistors, capacitors, and the traces on the board. This gives incorrect readings.

Have you verified that you have the proper sync pulses going through the resistors to the JAMMA edge? Have you measured resistances from the JAMMA edge to the resistors? Maybe you have a bad trace where it connects to the finger edge on the board?

This is where a logic probe and/or oscilloscope will help. The schematics will not easily help you if you can't determine where the signal is being lost. All you'll be doing with the schematic is identifying parts to swap without understanding which part is really bad.

First of all LS32 is short for 74LS32 so they are the same thing.

The path of the sync signal on the MV1FZ is as follows:

LSPC2 (150)
|
|
|
U1 (1,2)
U1 (3)
|
|
|
100ohm
|
|
|_____470ohm____5V
|
|
|
JAMMA P

A multimeter is therefore enough to check if a trace in the above path is broken.
But of course a logic probe would tell you rightaway if you have a pulse (and a high state due to the 470ohm resistor to VCC) or not at the Jamma pin.

Channelmaniac is correct about the false resistor readings when done in circuit but in this case one side of both resistors is connected to the Jamma sync pin which is the same as having those legs out of the circuit as he suggests. This means that you're supposed to read exact resistor values. Of course resistor failure isn't very likely so I don't think the problem lies there. What else could it be? Broken trace has already been mentioned so we are left with either the LS32 (U1), which is easy to replace, or the LSPC2 which is extremely difficult to work with and impossible to find as an off-the-shelf part (you would need to pull it from another MVS board).

It may be worth mentioning that the home system doesn't have any component (no LS32 and no resistors) in between the LSPC2 and the RGB encoder. In fact you could tap sync directly from the LSPC2 and run it to the monitor/RGB TV. The electrical characteristics of the signal wouldn't be altered enough to make it unusable.

OK.I will check this

Problem fixed,one of the chips was bad

Great news