Arcade Monitor Repair - Vertical collapse - Sega/Nanao MS9 29SU 

Very informative. I appreciated the exploration of why things have been done

Nice fix on video as always

Fraspe I agree with you. great job dok

Good job as always :-)

Nice! A new zett video! That made my day. Good work as usual. I'm not sure this is something I'd take on when startng out, but good to know about. Perhaps you might do a video on discharging an degaussing at some point. I know if you're going to work on a monitor you really must discharge it, but when should you degauss and what sorts of things will that no help with?

Frame IC :) :) it's great to see people who can repair this , it's my first job TV repair but CRT technology dying 8 years after it , now i'm on laptop :) :) this is great too but i love this time when you can only replace a component..........

Very nice thanks!

Show de bola parabéns!

Hi Doktorzett, thanks for sharing this information, I will order parts today. I have another 29 inch Nanao with a lot of picture noise(similar to a faulty power supply on the game board video output, but I have isolated to the monitor chassis). Any clues which caps may require replacement? Rather not shot gun the entire chassis as I think this can create more problems. Thanks! Brett

Thank you what a what a great video

Good morning, I'm from Brazil and I'm repairing a nanao ms9-29 monitor. And I have problem in the source: what is the voltage that feeds the horizontal of this monitor? Please, please help me. Thank you.

Where can I purchase a tpg like yours? Test pattern generator? How much are these typically?

I have one question, have you done a complete/or any capacitor swap before the vertical collapse (LA7837 fail) happened? greetings from Uruguay.

Buen video amigo una consulta tengo un monitor que al prenderlo se me apaga toca desenchufar y descargar el condensador de la fuente 1000uf/200v para luego volver a enchufar la alimentacion para encerderlo enciende pero continua el problema la placa del monitor es nanao e cambiado con condesadores electroliticos pero no mejora me puede orientar q puedo revisar le agradeceria por su ayuda saludos cordiales

Would anyone know what would cause the top of the screen to pull to the left once warmed up on a Commodore 1084? Other than that it works fine.

The dislike must be from a Hantarex fanboy

Can u repair ms2391-s chassis??let me know my blast city monitor is kaput!

various arcade games use different arcade monitors with different rasters and resolutions, all the sync signals are all different for various arcade games. Any reasons why they made different sync signals for different arcade monitors? You can't take an arcade monitor and swap and replace them with another arcade monitor because the sync signals H&V signals will scramble the colors on the CRT. The arcade monitors circuit board ground is not chassis earth ground because of the isolation transformer. Why does arcade monitors circuit board use an isolation transformer?

I have a similar issue to this but the line is right at the top of the screen, is this the same issue?

Hello - I did an entire cap kit on my Sanwa PM1745 C chassis with a vertical collapse and to my surprise It didn't fix the problem. Any idea where else to look? I have the twin Japanese Daytona USA and would really like to keep them. They were working fine with hundreds of hours of fun and the left monitor just tapped out.

Hi what is the make/ name of your test pattern generator?

I ran into this exact problem a couple years back. It would actually blow the center out of the vertical IC if certain caps were bad. On most of the Nanao monitors I've seen, the degauss was controlled by a manual switch mounted behind the coin door. You would have to push it for a few seconds each time you relocate the game. Not sure why they did it that way, since the thermistor circuit still worked the same as any other monitor. These usually have a great picture, even if the CRT is a bit weak. I know the older MS8 used a Mitsubishi CRT, but I can't remember if the MS9 did.

Hi, tnx for this nice Video, i have the same Monitor. My makes another kind of problem. It flashing very strongly and has wave borders (barrel distortion) :(

I just had this problem with the same monitor today. What were the chances...

I have horizontal collapse on a zaxxon cabinet

If it were always that easy haha

Current kills, not voltage (in response to the warning at the beginning). It is usually conscience they go hand-in-hand. Best proof is touching a door knob on a cold, dry day. You might get a static shock. Those that have a very mild sense of pain are about 35KV, but the current draw is so low, you barely notice any pain at all. This is why you might see people in some pain when using a Van De Graff generator, as those are about 60KV on average.

Same problems as CRT tv.

EHT voltages in a color monitor are up to 33 kV and are LETHAL. There's other lethal voltages too, for example in the switch mode power supply (SMPS) 350 VDC. You need rubber-sole shoes, a rubber mat, an isolation transformer and a Ground Fault Circuit Interrupter (GFCI) and experience.