Recently capped WG19K7602 blew fuse and now has no neck glow

[midnightpulp]

Hi guys. Recently capped my 19K7602 in my Jamma cab. Everything went well. Machine ran great for 3 days up until last night. Went to turn it on and got nothing. Pulled out the board and discovered the fuse was blown. Replaced the fuse, still nothing, not even a faint neck glow. Checked the B+ and it's 0. Referring the manual's troubleshooting flowchart, it says to check the filament circuit which I'm unsure how to do.

Other than that, maybe I have a shorted HOT?

Gonna pull out the board again tonight. Anything else I should look for?

Any help is greatly appreciated.

[lilshawn]

any time you re-cap a board you have to check the B+, often components get strained when the voltage is low due to bad caps, then all of a sudden, the load is less, now that the caps are good, but things like resistors have changed value...your voltage probably blew out the hot.

check with a meter set to ohms and put your red on the first leg and the black on the second...it should read high resistance. if it reads open or no resistance it's bad.

[SirPeale]

To clarify - you replaced the fuse - is the new one still good?

[midnightpulp]

To clarify - you replaced the fuse - is the new one still good?

Just pulled out the board. New fuse is indeed blown.

[midnightpulp]

any time you re-cap a board you have to check the B+, often components get strained when the voltage is low due to bad caps, then all of a sudden, the load is less, now that the caps are good, but things like resistors have changed value...your voltage probably blew out the hot.

check with a meter set to ohms and put your red on the first leg and the black on the second...it should read high resistance. if it reads open or no resistance it's bad.

Just checked. Got a reading of 0.01. So I assume that's open. Looks to be bad then.

Anything else I should check?

Thanks for your help.

[SirPeale]

That's with the Ohms setting?  That's a dead short.

[midnightpulp]

That's with the Ohms setting?  That's a dead short.

Yeah.

Should I check anything else? C36?

Thanks.

[SirPeale]

Since you have your meter out, you might as well check anything and everything.  Definitely C36, C37, C38.  C69 if yours has one.

[midnightpulp]

Since you have your meter out, you might as well check anything and everything.  Definitely C36, C37, C38.  C69 if yours has one.

Thanks. And to clarify, I will also check those components on the Ohm setting?

Also, what's the process for replacing the HOT? I'll need heat sink grease, a mica insulator, and of course the HOT, correct? Do I use the grease to glue the insulator to the hot and then to glue that to the metal piece behind it?

Thanks again.