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Main => Monitor/Video Forum => Topic started by: segasonicfan1 on November 23, 2016, 08:07:22 pm

Title: Nanao MS9-29 Yoke issue
Post by: segasonicfan1 on November 23, 2016, 08:07:22 pm

I have tried two working chassis so the problem definitely appears to be the tube or (more likely) the yoke.  Anyone have a suggestion of where to start?  I've only worked on the chassis before.  Monitor shuts off after ~2 sec.  Here's some pics.

Any help is much appreciated!!!

-Segasonicfan

Title: Re: Nanao MS9-29 Yoke issue
Post by: grantspain on November 24, 2016, 01:04:23 am

read the vertical winding of the yoke,should be about 9-10ohms

Title: Re: Nanao MS9-29 Yoke issue
Post by: segasonicfan1 on November 25, 2016, 04:31:35 pm

Thanks!  Do you know winding value for the H yoke?  I think its an H collapse (the pics show the monitor tated).

Title: Re: Nanao MS9-29 Yoke issue
Post by: grantspain on November 25, 2016, 06:05:51 pm

oh yes,must have been half asleep when i first viewed this
horizontal deflection failure will be down to either bad/burnt yoke connector,bad solder joint on chassis or flyback faulty
the hot being short ciruit would put the chassis into ocp mode

Title: Re: Nanao MS9-29 Yoke issue
Post by: segasonicfan1 on November 25, 2016, 10:55:11 pm

Thanks for the reply.  Do you know the reading for the H winding on the yoke?
The chassis is good, there have been 2 working MS9-29 chassis tried on this tube now.  So it can't be the HOT or Flyback, it has to be either the yoke or the tube itself.  I somehow doubt that H collapse could be caused by the guns going bad though.

Title: Re: Nanao MS9-29 Yoke issue
Post by: grantspain on November 26, 2016, 05:24:14 am

about 0.8 ohm
you could remove the yoke and check for corrosion

have used the same remote board and cable to test each chassis