Sanyo 19" EZ Issue Help Please

thepita007

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Hello,

I have a mario bros. with a sanyo ez. Monitor worked fine except for distorted top so someone tried a cap kit and now nothing happens. I am fixing this monitor for a friend and need some I help.

I have done the following according to the flow chart.

Tested Q902 black to monitor frame, red to HOT case with multimeter set in diode test I get a reading of 1.

I then tested Diodes D601-D604 with multimeter set to diode in one direction I get a reading of 1 in the other direction I get a reading of 530

I then measured B+ which was 35.5 vdc. I tried to use the B+ adjustment pot and it has no effect on the voltage. I pulled the boards and checked the solder points and traces and they looked good. Also I verfied the caps were installed correctly which they were.

Any ideas?
 
possile flyback is bad. maybe a bad trace you missed. i heard people put the board up to as bright light and flex it alittle to see any broken traces, i personally never had to do that , just my 2 cents.
 
If you started with a working but distorted image, that tells me that your fly, your pot, your hot, your flyback and everything else were working just fine for power purposes so: You've either installed caps backwards, cracked the board on removal/install, bridged traces or you further opened up broken solder joints that these things always have. Your initial B+ reading before you touched the chassis was obviously high enough to show you an image as it takes at least 85VDC to produce a picture even though it will wave like hell. The 35VDC you're getting now would have never allowed the monitor to fire at your starting point and obviously it still won't.

Pull the chassis back out and dig out the magnifying glass, you need to start over unfortunately. Take a real close look at the traces around standoffs that held your chassis in place, i've worked on hundreds of these chassis that have had the corners snapped off or cracks around these locations due to agressive removal.
 
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If you started with a working but distorted image, that tells me that your fly, your pot, your hot, your flyback and everything else were working just fine for power purposes so: You've either installed caps backwards, cracked the board on removal/install, bridged traces or you further opened up broken solder joints that these things always have. Your initial B+ reading before you touched the chassis was obviously high enough to show you an image as it takes at least 85VDC to produce a picture even though it will wave like hell. The 35VDC you're getting now would have never allowed the monitor to fire at your starting point and obviously it still won't.

Pull the chassis back out and dig out the magnifying glass, you need to start over unfortunately. Take a real close look at the traces around standoffs that held your chassis in place, i've worked on hundreds of these chassis that have had the corners snapped off or cracks around these locations due to agressive removal.

Basically he's saying you may have grabbed your junk too hard.

Inspect your junk for damage.

Put your junk back, and hope your junk still works.





seriously, though, something was not installed correctly. Double and triple check your work.
 
Here is a high res image of the board you can download and zoom in really close. Notice anything I dont?

http://www.robertjsimmons.com/sanyo_board.jpg

sanyo_board.jpg
 
The deflection board is filthy to begin with and needs to be cleaned with 90% or better isopropyl alcohol and a tooth brush. Next you may want to fix the extremely crappy solder joints at the yoke header.
 
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