Don't you hate it when...

modessitt

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So I have this 25K7197 that took a crap a while back because I didn't realize that sparks would fly if the dag wire wasn't connected to the neckboard.

Well, i thought I'd found all the bad parts, and tonight put in a new flyback, HOT, VR, and critical safety cap. I had also checked the various diodes and transistors for shorts, as well as the big resistors, but hadn't found anything.

So what happens when I fire it up? Yup, the fuse blows again.

So - I pull it back out and find my new VR, HOT, and critical safety cap are blown again. Wonderful. Hopefully my flyback is still okay. Didn't have any sparks this time.

This is what I get for only ordering one each from Bob. If I had ordered extras, I wouldn't have needed them.

Monitors suck...
 
7000's are awesome.
Easy to fix.... average repair takes about 15 minutes with a bad HOT.
I've repaired approx 3500 monitors and likely 65% have been 7000 series.... you want sucky.... lets talk the old 4600 series with those damn vertical boards. the 4900 series wasn't much better.
Even worse is those jap nanao pieces of crap.
Most 7000's are just cap problems.... mainly the 22uF and 47uF @ 160v.... monitor just shuts down.
Worst problem is generally the HOT and caps... the .0061, the .15 and .39 being the most common to short out.
Don't dis the 7000's.... they are a good old monitor. :p
 
7000's are awesome.
Easy to fix.... average repair takes about 15 minutes with a bad HOT.
I've repaired approx 3500 monitors and likely 65% have been 7000 series.... you want sucky.... lets talk the old 4600 series with those damn vertical boards. the 4900 series wasn't much better.
Even worse is those jap nanao pieces of crap.
Most 7000's are just cap problems.... mainly the 22uF and 47uF @ 160v.... monitor just shuts down.
Worst problem is generally the HOT and caps... the .0061, the .15 and .39 being the most common to short out.
Don't dis the 7000's.... they are a good old monitor. :p

I'm not dissing it, as I've fixed 3 in the past few day. And I can fix all the others you've mentioned and find the 4900 to be one of the easiest to fix.

I just hate it when all the easy stuff, or normal stuff, doesn't fix a damn thing. or in my case, when you buy $20+ in parts, plug it in, then lose them all to some unknown issue...
 
Thats sucks ! After all that work and money ! I've been lucky so far , usually the monitors works great after I've worked on them .
 
I'm not dissing it, as I've fixed 3 in the past few day. And I can fix all the others you've mentioned and find the 4900 to be one of the easiest to fix.

I just hate it when all the easy stuff, or normal stuff, doesn't fix a damn thing. or in my case, when you buy $20+ in parts, plug it in, then lose them all to some unknown issue...

I can fix them too, as well as Neotec, kortek, Hantarex, Tatung, Sampo, Makvision, Electrohome, Pentranic, Sharp Image, and so on.... I just don't like them as much as the wells 7000 series... just my personal preference I guess.

As for your issue, I agree, it sucks when you are confident you have fixed the issue and it blows up in a few seconds and your components are toast.
It's easy to miss c37 .15uF and c38 .39uF which will toast your chassis after changing the HOT, c36, c69 the VR etc if they aren't changed. You might want to take a peek there.
 
I fixed it. Apparently the flyback wan't as good as I thought...

Awesome... nasty thing about flybacks is they often just don't die all at once. Which would make life with monitors a lot simpler.
Good that you got it fixed without further expense though.
 
Awesome... nasty thing about flybacks is they often just don't die all at once. Which would make life with monitors a lot simpler.
Good that you got it fixed without further expense though.

Well, I had to buy a flyback, HOT, and VR, but it turns out that C36 wasn't bad, just looking like it....
 
Well, I had to buy a flyback, HOT, and VR, but it turns out that C36 wasn't bad, just looking like it....

C36 will show shorted anyway if the HOT is bad. (Unless you pull either the HOT or the cap before testing)
Hard to make a call on the flyback sometimes as that chassis usually only requires a fuse, HOT, a few caps and maybe the VR to make it spark again. Flybacks only go maybe 10% of the time in my experience.
Hard to know when to stop buying parts and invest in a new chassis instead... it almost gets personal.
 
on a k7000 ? the fly is only bad 10% of the time???? BULLSHIT these are notorious for cracks , arcing, and failure, I have had a shit ton of these come across my bench and probably 70% had flybacks arcing from cracks or totally dead flys
 
You must have got all the bad ones.
Just out of curiosity.... exactly how many monitors are in a shit-ton?
 
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mod when i do em the ones with white knobs get done automatically, the all black ones get cleaned and looked over and if i see any cracking at all or glue bubbling form the seams i replace those too..


also if its a service call i also just replace the fly... it aint wirth the callback for a $20 part heh...
 
Well, the flyback that was bad WAS a new style, installed less than two weeks earlier. but like I said, I didn't realize it would spark all over without the dag wire connected, and apparently the sparking damaged the new one enough to cause it to blow the other parts on power up...
 
You must have got all the bad ones.
Just out of curiosity.... exactly how many monitors are in a shit-ton?

I have a K7000 med res chassis I would LOVE to see you fix, since they're so easy and all. ;)

Not a joke - seriously, I would love to see you fix it. Give me your address!
 
I have a K7000 med res chassis I would LOVE to see you fix, since they're so easy and all. ;)

Not a joke - seriously, I would love to see you fix it. Give me your address!

I doubt it's worth your while to send it to the east coast of Canada.
I've had flybacks desolder themselves and burn a quarter sized hole in the chassis and a bit of epoxy and some hand wiring later the chassis was up and running.
On average I fix 3 to 5 7000's a week and I'm not seeing all the issues with flybacks some of you are seeing.
HOTs are common as are the tuning caps, the VR.... and a lot of the time c56 and c57 cause the chassis to shut down or cause jailbars on the left side of the screen.
Yeah you sometimes see small cracks around the screen and focus controls, but they are not a big issue unless they appear near the top of the unit, since that is when they seem to arc most frequently.
But on average I replace maybe 1 flyback out of 10 chassis I fix... if that.
 
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