PC Engine GT - Controller Board (updated with external controller mod)

[pipi]

This is lovely work!

Allow me to ask a quesiton that can help me in troubleshooting my dead speaker...
Which are the speakers connections here?

I guess it is a mixdown of left and right because we have a mono speaker...
Which pin is + and which ping is -?

I think 12 should be - because I see continuity with ground
11 should be + but what is its route?

Thanks!

[tawy]

speakers on every handheld are not ground connected and there is no polarity, you can connected it to either side
it's pin 11 and 12 (the leftmost ones).
good luck.

[pipi]

Ok my mind is now blown :O

Do you happen to know which is the pinout for the 3.5mm speaker on the PCE GT?
I tried both an aliexpress 3.5mm female plug and a game gear one (with different pin numbers, strange) but both give me great earbud audio and zero speaker sound :/

[tawy]

the game gear jack connector is the good one. you have to check the 3 pins on the end of the connector and follow the traces :

when jack not connected, the middle pin is shorted to a pin and sound goes to the speaker
when jack IS connected, the middle pin is shorted to the other pin and sound goes to the jack earphone.

it works as a switch.

[pipi]

the game gear jack connector is the good one. you have to check the 3 pins on the end of the connector and follow the traces :

when jack not connected, the middle pin is shorted to a pin and sound goes to the speaker
when jack IS connected, the middle pin is shorted to the other pin and sound goes to the jack earphone.

it works as a switch.

I fixed it!
It was the damned flat connector from controller to mainboard

Thanks for your help.
Can I ask your opinion on this, if you have time?
Your controller board knowledge can surely shed a light!
https://www.pcenginefans.com/forum/index.php?topic=23766.0

[pentarou]

Awesome, keep up the good work, dude.