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China MIN DONG TV-MD 14/22 repair
perjmolsen:
Hi
Trying one more time with a China chassis repair. :applaud:
Again just to learn the basics and to kill the time waiting for pats to my NANO MS9-SU29 repair.
This chassis where also put on the shelf, because back in 2008 i burned it by mistake because i turned the wrong pot (the knob which adjust the horizontal frequency).
So it died - no neck glow or anything after my mistake.
The Yoke spec for this chassis is:
VR: 11.8 ohm
HR: 2.14 ohm
I have pulled a TV apart, the pins is a match, and checked the tube:
VR: 11.2 ohm (yellow / blue)
HR: 1.9 ohm (red/white)
So this time I have one compatible monitor for testing ;D
I began to test and change parts, hoping to find some defects - and i found a couple defective :applaud:
The parts that i have tested is marked with color in this sheet. -> https://www.dropbox.com/s/ssfd4c0xpl66ste/Rep%20log%20Min%20dong%20md%2014-22.xlsx?dl=0
I have changed the parts marked by green, because they where dead.
So my plan is now to put in the parts that i have pulled out and tested OK - and connect it to the monitor and see what the status is...
Or do i need to test/check anything before?
This chassis i can be used with 220V
perjmolsen:
Pictures of the chassis
perjmolsen:
Status with all components in.. Nothing...
I tried to see if there where any volts at the big 10 ohm ceramic resistor, but 0V.
There is also no neck glow or any high voltage sound.
So i guess i need to remove the HOT (BU2520DF) the transistor mounted at the heatsnik next to the flyback, and then test for volt at the flyback...
But how to i figure out witch leg i need to de solder at the flyback in order to test B+?
princess prin prin:
Remove the HOT and connect the lightbulb to the middle pad.
perjmolsen:
--- Quote from: princess prin prin on January 13, 2019, 08:07:55 am ---Remove the HOT and connect the lightbulb to the middle pad.
--- End quote ---
Thanks :)
But 0V :(