Nfl blitz pcb help

[Killerinstinct69]

So i got this pcb for 50$ i know a steal.plus the hdd works fine but only one things ,working only red color works, green and blue output dont work

edge connector has some damage as seen in pictures also

How can i ge the colors back? Is it maybe the edge connectors?

 

[hoagtech]

Pin 13 looks like it had been an attempt at repair.

You could follow the the trace behind pins 13 and N and connect a wire to its solder point to the underside of a JAMMA fingerboard or extension

I would the check continuity from the edge to the pin first see where it lost its connections

 

[Killerinstinct69]

Pin 13 looks like it had been an attempt at repair.

You could follow the the trace behind pins 13 and N and connect a wire to its solder point to the underside of a JAMMA fingerboard or extension

I would the check continuity from the edge to the pin first see where it lost its connections

You think it would work if i just fixed the edge with coper tape like i see in some vids?

 

[hoagtech]

You think it would work if i just fixed the edge with coper tape like i see in some vids?

No you’ll have to bridge the next closest to the failed edge pin. The area circled is video blue. Underneath is video green on pin N.

If you check continuity on the trace leading to those pins you can see where the disconnect happened.

Lmk if you need help checking continuity leading to the JAMMA edge

 

[Killerinstinct69]

No you’ll have to bridge the next closest to the failed edge pin. The area circled is video blue. Underneath is video green on pin N.

If you check continuity on the trace leading to those pins you can see where the disconnect happened.

Lmk if you need help checking continuity leading to the JAMMA edge

Yes please im new to that stuff

 

[hoagtech]

Yes please im new to that stuff

Set your multimeter to continuity (the one that looks like "Volume up" symbol on your meter).

Tap your probes together and you should hear the "beep" of success

Each jamma edge has its own circuit. You see the gold plating attached to it?

Test a probe on the jamma edge and the nearest solder point on the same "road" if you dont hear the "beep" off success, then it means your circuit is broken.

Then test further down the lane

You don't need to power on your pcb.

Test Pins for continuity: N, P, 12, 13 (Especially 13 as it looks like someone attempted repair)

Jamma pinout in spoiler:

The right side is the top of your connector (parts side) and the left side is the bottom of your jamma (solder side)

Spoiler: Jamma pinout

 

[Killerinstinct69]

Set your multimeter to continuity (the one that looks like "Volume up" symbol on your meter).

Tap your probes together and you should hear the "beep" of success

Each jamma edge has its own circuit. You see the gold plating attached to it?

Test a probe on the jamma edge and the nearest solder point on the same "road" if you dont hear the "beep" off success, then it means your circuit is broken.

Then test further down the lane

You don't need to power on your pcb.

Test Pins for continuity: N, P, 12, 13 (Especially 13 as it looks like someone attempted repair)

Jamma pinout in spoiler:

The right side is the top of your connector (parts side) and the left side is the bottom of your jamma (solder side)

Spoiler: Jamma pinout

I only have this dont see a vol up

 

[hoagtech]

I believe its in between HFE and 200 ohms on that meter

You will know because it will beep when you tap your probes together

 

[Killerinstinct69]

I believe its in between HFE and 200 ohms on that meter

You will know because it will beep when you tap your probes together

Yup my probes dont beep lol at all cheap multimeter

 

[hoagtech]

They make an affordable Klein with most of the features.

I want to say it was $39.99. I don't think you would regret it

 

[Killerinstinct69]

They make an affordable Klein with most of the features.

I want to say it was $39.99. I don't think you would regret it

Ya id have to get s better one man

 

[Killerinstinct69]

Does anyone know the schematics of this PCB?

 

[channelmaniac]

Does anyone know the schematics of this PCB?

Yes.

Check continuity from the edge connector through these circled inductors (coils)... See if any of them are open or if any traces are open.

 

[Killerinstinct69]

Yes.

Check continuity from the edge connector through these circled inductors (coils)... See if any of them are open or if any traces are open.

So see if they beep if so there good? I put red or black on the edge and test those with the other probe ?

 

[channelmaniac]

Yes, if they beep they are good. Should go from Red connector - coil - (cap to ground) - coil - Video amp chip. Same for Red and Blue. Sync will follow a similar path too.

Put one meter probe on the proper edge connector then read one side of the coil, the other side of the coil, and the same for the next one up the line. You're trying to find out where the signals stop for Blue and Green. Either a trace is open, a coil is open, or the video amplifier chip is toast.

 

[Killerinstinct69]

Yes, if they beep they are good. Should go from Red connector - coil - (cap to ground) - coil - Video amp chip. Same for Red and Blue. Sync will follow a similar path too.

Put one meter probe on the proper edge connector then read one side of the coil, the other side of the coil, and the same for the next one up the line. You're trying to find out where the signals stop for Blue and Green. Either a trace is open, a coil is open, or the video amplifier chip is toast.

What does the video chip look like?

 

[channelmaniac]

It's a 14pin chip at U52. There are 33 ohm resistors between the coils and the output of the video amplifier chip.

 

[Killerinstinct69]

It's a 14pin chip at U52. There are 33 ohm resistors between the coils and the output of the video amplifier chip.

Are those cheap to buy do u have a link to buy one if there shot?

 

[channelmaniac]

No and no. You'll probably have to try eBay.

 

[Killerinstinct69]

No and no. You'll probably have to try eBay.

It seems im having trouble finding u52 on the pcb