Wow, that's quite a bummer if it can't be adjusted out. Paging MS9 guru @Hatsune Mike to enlighten us
Hmmmm.. I swapped to a MS9 in September last year and have had zero issues after that. No pinched center. Great geometry and convergence + awesome color since I find the MS9 was easier to calibrate. My Impress has been running perfectly with no issues. I was in luck and found a NOS MS9 and got some custom cables done for a drop in replacement. Will not be going back to the old chassis.Do not replace the hitachi GMK29FS chassis with nanao ms9, you will get the screen pinched on center due to a slight difference in the yoke inductance, I have already tested this on my impress, just recap your chassis and replace that flyback (hitachi 2435048 you can find it on EBAY just now, it Is a China copy but works, also GMK29FS is a bit better than ms9 in 15khz.
What's the PCB type ?It’s a MS9-29A
It’s a 05a00675c1, so that makes it a MS9-29T.What's the PCB type ?
- PCB-MAIN: 05A00675D1 (red C101, green wire over U550)
- PCB-MAIN: 05A00675C2 (red C101, green wire over U550)
- PCB-MAIN: 05A00675C1 (red C101, green wire over U550)
- PCB-MAIN: 05A00675A1 (red C101, black wire over U550)
- PCB-MAIN: 05A00585D1 (black C101)
It is possible to modulate the s correction also when there is no adjustment pot on chassis.
When it Is on, is the picture perfectly stable?
Have you already tested Q902 (FN651)?
Before replace any part you should first study the circuit of the switching psu section then test the parts out of the circuit and if truly out of spec, replace . I will try to inspect into that board to give you some more infos and test points to check.Yeah, I bought a replacement just to be sure the original wasn't breaking down under stress. Same issue unfortunately.