Jbl prx515

[Amraks]

I have a JBL speaker unit that all of a sudden is not outputting after a few minutes with sound.

This one has me baffled.

Anyone have a schematic also?

Freezing in a certain area of the board does this make this come on. not sure if this is a overheating issue or a badsolder joint or some other component.

[CapLeaker]

Re: Jbl prx515

Just go along the audio chain while playing something like a 1khz tone. Try a can of air upside down and freeze certain IC’s or check every stage with the oscilloscope. If it is a bad op amp audio goes in and nothing comes out. Does the length of time it plays audio change by different volume settings?

[Amraks]

Re: Jbl prx515

I have found a similar schematic for a the JBL PRX 518

In the schematic RT2 is meant to be 20kohms

RT2 = 15kohms

while this is on spraying RT2 with freeze spray outputs the sound again.

Question I have is this RT2 bad?

[Amraks]

Re: Jbl prx515

Here is the schematic for a similar model prx518

[CapLeaker]

Re: Jbl prx515

When the audio disappears, can you make it come back by freezing that component?

[Amraks]

Re: Jbl prx515

When the audio disappears, can you make it come back by freezing that component?

It was a dry solder Joint on the transformer, I touched up all the joints around this area including smd components.
I discovered if i pushed on u7 it would start again didn't need the freeze spray at all.

its working and not cutting out anymore.

I should of done this sooner as its been in my road for awhile now.

[CapLeaker]

Re: Jbl prx515

awesome! Another one saved from the dump.