Electrohome G07 missing B+

[jehuie]

You should try replacing or testing the transistor at X303 as well. I've seen 'em short before causing similar results. Worth a try anyway.

Can that be tested in place? I think I need to pull it to get correct readings right? I actually looked for the part locally but couldn't find it. Fry's Electronics said it's been discontinued which doesn't sound right. I tried a couple places. Everyone has NTE290 but not NTE290A which is what it cross references as.

The reason I didn't spend more time checking that would fall into the "two unrelated problems at once" category. Which is far less likely than me just screwing up something in my original "repair".

 

[gregatron]

Can that be tested in place? I think I need to pull it to get correct readings right? I actually looked for the part locally but couldn't find it. Fry's Electronics said it's been discontinued which doesn't sound right. I tried a couple places. Everyone has NTE290 but not NTE290A which is what it cross references as.

The reason I didn't spend more time checking that would fall into the "two unrelated problems at once" category. Which is far less likely than me just screwing up something in my original "repair".

Mouser has the NTE cross but not the original 2SA673
http://www.mouser.com/Search/Refine.aspx?Keyword=NTE290A

You should pull it just to be sure your readings are correct but you can check it with diode check on your meter.

 

[jehuie]

Ok I swapped out the capacitor on the neck board just to be sure since I had a spare but it made no difference.

I'll check that resistor and transistor tomorrow since, apparently, it's time to call it a night tonight. Errrrr.

 

[jehuie]

I checked the board and there is no resistor at either R125 or R126. It appears that there never was one there. It's marked and there are holes but they are filled with solder from the back and there's no indication that the cardboard had been removed from the neck board. Should there be a resistor there or is this a different version of the neck board that doesn't need it?

 

[jehuie]

Anyone know the answer to that last one? Should there be a resistor there?

 

[modessitt]

Apparently not. just looked at two I have here and neither had the resistor. Dunno why it's on the schematic.

Anyway, this IS a G07-CBO, correct? Just want to make sure it's not an FBO...

 

[chris25810]

Jesus Christ, we're 5 pages into this thing and it still isn't running yet. Just drop the thing in the mail to me and i'll figure out where you went wrong in 5-10 minutes.

 

[modessitt]

Jesus Christ, we're 5 pages into this thing and it still isn't running yet. Just drop the thing in the mail to me and i'll figure out where you went wrong in 5-10 minutes.

I thought the same thing a long time ago. I always tell people they could pay me to fix it and they'd have it back faster than the weeks they spend on these things, but some people would rather waste time than spend $50...

 

[chris25810]

I'm all for learning but even i have a back up when i feel i've wasted enough time.

 

[modessitt]

I hear you. There have been many POS chassis that I've ended up swapping with a good one I had ready and then took my time with the POS one later.

At this point, he'd learn more by having one of us experts fix it and then tell him what was wrong. Then he'd have a basis for the next one...

 

[jehuie]

I'm all for learning but even i have a back up when i feel i've wasted enough time.

Yeah I've actually been considering sending it off to someone but I'm into it this far and it feeeels like it's close. Got the first issues all worked out and now just need to figure out why it's too bright. Eh, maybe you are right. I just hate for it to "beat" me like that!

There....six pages into it now....

 

[modessitt]

There....six pages into it now....

Only 2 pages for me.

And answer the CBO/FBO question...

 

[jehuie]

Only 2 pages for me.

And answer the CBO/FBO question...

Sorry...I was getting the feeling you guys were tired of seeing this so I was going to stop posting. It's a CBO.

 

[chris25810]

Yeah I've actually been considering sending it off to someone but I'm into it this far and it feeeels like it's close. Got the first issues all worked out and now just need to figure out why it's too bright. Eh, maybe you are right. I just hate for it to "beat" me like that!

There....six pages into it now....

If transistor X303 is good, check for a broken trace at the flyback on pin 7

 

[Dokert]

Jesus Christ, we're 5 pages into this thing and it still isn't running yet. Just drop the thing in the mail to me and i'll figure out where you went wrong in 5-10 minutes.

Took you long enough.

 

[jehuie]

Just a final note for completeness, the brightness was caused by a bad X303. The part# is NTE 290A. Swapped it out and all is well.

Thanks for your patience (for those who were patient). Your help is greatly appreciated!