Hi Forum,
I can certainly use some help.
I was kindly offered an upright arcade video game "Street Fighter" with a 19" color CRT monitor with a name brand "Yatta". I have reached out to many arcade parts houses and with the search in Google, I cannot find anyone that is familiar or have heard of this brand so I would like to reach out to all of you.
First, I need to locate a set of schematics of the unit – Second I am in need to locate a Flyback Transformer BSC23-F1412A
I started to troubleshoot the monitor and found that the 2A fuse was open (Note: Someone added an external wire instead of the fuse across the terminals) – I started to do more troubleshooting and located the following bad parts;
1) Shorted - Main NPN Power switching transistor for the flyback
2) Open – Power Resistor 8 Ohms Attached to the Emitter leg (Current Limiter)
3) Shorted - A series pass NPN Power transistor
I went around thoroughly with my ohm meter and started to probe all the resistors, transistors, capacitors and diodes on the board to see if there are any other parts that have fatigued – Conclusion is no other parts to me seem to have died however if there is a “Walk and Wounded” part – that may be.
I located and purchased all the parts (Except for the flyback) and replaced them all including the fuse – after applying 110VAC power I heard a faint arcing noise and the repeat of the 2A fuse open. I went straight to the resistor and it was still measuring 8 Ohms. I checked the 2 previously shorted transistors and found they were still measuring good. I suspect the flyback at this point. What is interesting is that the high voltage retained a charge in the CRT Picture tube since I discharged that path – I heard it. Perhaps an inner winding (High Voltage Breakdown) problem in the flyback.
Here is where it gets tricky and this is where I turn to the community for help. – Hopefully I haven't lost anyone yet –
The flyback is getting tougher to locate since the phasing out of CRT's – You still can locate flybacks from China and Ebay but they are getting scarce by the minute. The one particular part that I need I cannot locate – I am on a mission to substitute with an equivalent part – I am strictly challenging myself to see if this can be achieved – No other reason.
The PC board backside doesn't help me much since it doesn't include silk screening with descriptions which means I went strictly on trace to trace from part to part to give me an approximate destination and output.
I have attached pictures to help with my story and quest. Any help is greatly appreciated – If I have left something out please tell me so I may provide it.
Thank You,
Richard
I can certainly use some help.
I was kindly offered an upright arcade video game "Street Fighter" with a 19" color CRT monitor with a name brand "Yatta". I have reached out to many arcade parts houses and with the search in Google, I cannot find anyone that is familiar or have heard of this brand so I would like to reach out to all of you.
First, I need to locate a set of schematics of the unit – Second I am in need to locate a Flyback Transformer BSC23-F1412A
I started to troubleshoot the monitor and found that the 2A fuse was open (Note: Someone added an external wire instead of the fuse across the terminals) – I started to do more troubleshooting and located the following bad parts;
1) Shorted - Main NPN Power switching transistor for the flyback
2) Open – Power Resistor 8 Ohms Attached to the Emitter leg (Current Limiter)
3) Shorted - A series pass NPN Power transistor
I went around thoroughly with my ohm meter and started to probe all the resistors, transistors, capacitors and diodes on the board to see if there are any other parts that have fatigued – Conclusion is no other parts to me seem to have died however if there is a “Walk and Wounded” part – that may be.
I located and purchased all the parts (Except for the flyback) and replaced them all including the fuse – after applying 110VAC power I heard a faint arcing noise and the repeat of the 2A fuse open. I went straight to the resistor and it was still measuring 8 Ohms. I checked the 2 previously shorted transistors and found they were still measuring good. I suspect the flyback at this point. What is interesting is that the high voltage retained a charge in the CRT Picture tube since I discharged that path – I heard it. Perhaps an inner winding (High Voltage Breakdown) problem in the flyback.
Here is where it gets tricky and this is where I turn to the community for help. – Hopefully I haven't lost anyone yet –
The flyback is getting tougher to locate since the phasing out of CRT's – You still can locate flybacks from China and Ebay but they are getting scarce by the minute. The one particular part that I need I cannot locate – I am on a mission to substitute with an equivalent part – I am strictly challenging myself to see if this can be achieved – No other reason.
The PC board backside doesn't help me much since it doesn't include silk screening with descriptions which means I went strictly on trace to trace from part to part to give me an approximate destination and output.
I have attached pictures to help with my story and quest. Any help is greatly appreciated – If I have left something out please tell me so I may provide it.
Thank You,
Richard
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