Sega Power Drift Pcb Audio and Video Problems...

[glstar]

I got this upright more than a years ago and was in not good conditions.....but with my wife and a good friend of mine i manage to have it restored (thank to Stephen of arcadefixit too, for selling me some nos items.... )
This is how the cab was when i got it:




This is how the cab is now:





But.....i've some problems with the board fitted in my Power Drift Upright machine......
I got this cab and is workign apart for two problems.....
One is that the board show some little point on screen sometimes when in play and Always on the first image where the name Power Drift is, on the edge of the words.....and sometimes (just one time until now) for example arrived at stage 3 the board block itself and i've to shutdown the cab and restart to have it work again.
Here you can clearly see the video problems....all that little White dots on the screen...





Second problem is that i cannot hear the audio at all.....
I was think about the power amp etc., but i change it and a friend of mine tested all the audio components and they were all fine (from hardware point of view).
So maybe the audio problem is related to the board itself.
Here you can find some pics of the board itself and in particular of the audio part of the cpu board...






Could you tell me what you think about it?
I've to buy another board or the board can just be repaired (in case do you know from who)?

Please help me finally restoring my power drift cab.
 

[baritonomarchetto]

Let me state the obvious : did you check the 5V juicing your PCB? The board blocking problems you are experiencing sound very "5V too low or too high" to me. Are 12V juicing your board correctly? They are related to audio, so if they are missing, audio will be missing too.

[glstar]

Let me state the obvious : did you check the 5V juicing your PCB? The board blocking problems you are experiencing sound very "5V too low or too high" to me. Are 12V juicing your board correctly? They are related to audio, so if they are missing, audio will be missing too.

I just check, but trust me i don't know where the +5v or +12v comes out....
I have a psu inside the cab but only have +V and -V.......
And i don't know what is mean......

[kroustibat]

check the manual for the filter pinout diagram

there's 2 connectors on the left end (one for each level of the pcb) with lots of yellow and white cables, they are power. +5v & ground (i think the 5v is the white, to be checked)

[glstar]

check the manual for the filter pinout diagram

there's 2 connectors on the left end (one for each level of the pcb) with lots of yellow and white cables, they are power. +5v & ground (i think the 5v is the white, to be checked)

Thank you.
I'll try to have the measurements just by those points.....
But what does mean the fact i have +V and -V on the PSU??
Here you can find two pics of the PSU:



Where are the +12v and +5v??

[baritonomarchetto]

Take a look at this: http://pcbiroiro.blogspot.it/2012/03/one-of-my-favourite-games-and-that-of.html

yellow 5V, white ground. Being the cables connected to your PSU white and yellow, i suppose they are 5V and GND. Take your multimeter and measure it to be sure.

About the audio: that board have not a built-in  amplifier, but an external one. To see which one is defective, the amp or the audio output on the board, you should listen to the non amplified audio coming from the board by using a ear-phone (see previous link for reference).

It could help to see some other pic of the internal part of the cabinet

[glstar]

Take a look at this: http://pcbiroiro.blogspot.it/2012/03/one-of-my-favourite-games-and-that-of.html

yellow 5V, white ground. Being the cables connected to your PSU white and yellow, i suppose they are 5V and GND. Take your multimeter and measure it to be sure.

About the audio: that board have not a built-in  amplifier, but an external one. To see which one is defective, the amp or the audio output on the board, you should listen to the non amplified audio coming from the board by using a ear-phone (see previous link for reference).

It could help to see some other pic of the internal part of the cabinet

I've to check the voltage on the board but in the meantime i do the following tests....
I change the z80 on the board but nothing change.
I use a connector to use ear-phone via pcb directly, but i cannot see the audio.
If i disconnect the audio cable from the pcb, i cannot hear anything from the speakers even if i put volume to max.
Below are some pics of the internal:

[Laszo]

I don't mean to be offensive but based on your postings here I guess that you are new to pcb/electronics repair?

You have three options:

1 - Go on like you are doing and hopefully you get lucky.... But most likely you will do more damage then good  And kill the pcb.

2 - Find somebody who is willing to service the board for you. You ask around on this forum.

3 - Decide it is time for a carreer change in which case I recomment that you use the internet to get yourself up to speed in electronics and then try to fix your pcb.

I hope you see this as a first positive step towards a working pcb. 

[glstar]

I don't mean to be offensive but based on your postings here I guess that you are new to pcb/electronics repair?

You have three options:

1 - Go on like you are doing and hopefully you get lucky.... But most likely you will do more damage then good  And kill the pcb.

2 - Find somebody who is willing to service the board for you. You ask around on this forum.

3 - Decide it is time for a carreer change in which case I recomment that you use the internet to get yourself up to speed in electronics and then try to fix your pcb.

I hope you see this as a first positive step towards a working pcb. 

Thank you for your suggestions but i already try to find someone that repair the board for me, but seems that nobody wants/have the necessary test bench to perform repair on those type of boards....
For this i already search for a replacement pcb but seems that they are not so easy to find......
If you have any other suggestion, i'll glady follow it.

[baritonomarchetto]

Sorry, but i am missing something here 

- with the volume all the way up and everithing connected, is some audio (i mean, an audio hummm or interference, not necessarily a game sound/music) audible? If yes, your amp board is ok (it's the board with big aluminum heatsink on the upper right side on your pics) and considering that you said that with earphones and audio cable disconnected nothing comes from the PCB, i would suspect the audio section of the board to be defective

- can you please measure the voltage between the white and yellow cables from the PSU? Measure them directly on the PSU. If they are ok, measure them on the board (there should be some test point for that, try to find them). Your reset problems could be related to a not sufficient logic voltage (5V) to the board...

[Laszo]

I don't mean to be offensive but based on your postings here I guess that you are new to pcb/electronics repair?

You have three options:

1 - Go on like you are doing and hopefully you get lucky.... But most likely you will do more damage then good  And kill the pcb.

2 - Find somebody who is willing to service the board for you. You ask around on this forum.

3 - Decide it is time for a carreer change in which case I recomment that you use the internet to get yourself up to speed in electronics and then try to fix your pcb.

I hope you see this as a first positive step towards a working pcb. 

Thank you for your suggestions but i already try to find someone that repair the board for me, but seems that nobody wants/have the necessary test bench to perform repair on those type of boards....
For this i already search for a replacement pcb but seems that they are not so easy to find......
If you have any other suggestion, i'll glady follow it.

Ok guys, who is going to italy this summer.......... Speak up

[baritonomarchetto]

You should all come to Italy in summer: we have kilometers of coasts, mountains, the best food (and girls  ) in the world, great arts and monumental cities (Rome, Venice, Firenze... the nicest cities on the globe at only 3 and a half hours of train each other)... you know that there's not a better place 

AND

some nice private game room, like glstar's gameroom 

[level42]

I've been to Italy last year. And I never go to the same country twice in a row

[baritonomarchetto]

I've been to Italy last year. And I never go to the same country twice in a row

"Never say never": looks like it's time for an exception 

[glstar]

Sorry, but i am missing something here 

- with the volume all the way up and everithing connected, is some audio (i mean, an audio hummm or interference, not necessarily a game sound/music) audible? If yes, your amp board is ok (it's the board with big aluminum heatsink on the upper right side on your pics) and considering that you said that with earphones and audio cable disconnected nothing comes from the PCB, i would suspect the audio section of the board to be defective

- can you please measure the voltage between the white and yellow cables from the PSU? Measure them directly on the PSU. If they are ok, measure them on the board (there should be some test point for that, try to find them). Your reset problems could be related to a not sufficient logic voltage (5V) to the board...

Hi.
Yes i can hear crackling and interference on the speakers with all connected....
I tried to make an earphone adapter to bypass the amp on the cabinet, but i can only hear some noise on the earphone.....like the same i hear on the speakers itself.
I measure the voltage and i got 5,40v on the psu and 5,20v on the board.
Plus i have the correct voltage on the amp too....
I also change the z80 that should control the audio in the pcb but that cannot changed anything.....
What else i could try to change?
I got a yamaha processor too to change in case, but since it's soldered i don't know if that could solve the problem or it's just a waste of time changing it.
I also bought another pcb, but it comes from the deluxe version of power drift, so i really don't know if i can change mine with this one (when it'll arrive to me).....