JBL EON 515XT No Power On

[Helmholtz]

Problem with pulse currents is the (series) impedance of ecaps, which at very high frequencies is composed of the ESR and the series inductance (ESL).
If you plot the impedance of ecaps over frequency, the impedance first drops with 1/f then reaches a minimum (the ESR) in the high kHz range from where it starts to increase mainly due to the ESL.
The impedance minimum of lower value caps is at a higher frequency and the ESR of foil or ceramic caps can be close to zero.

Paralleling caps lowers both total ESR as well as total ESL.

[ca7922303]

Replaced C645 again, made sure all five(5) traces leading from it were good, and back to no power on. Must have taken something else out when it had signal for 15 minutes. Have gone thru all the troubleshooting tests except for ones that require external power source. Guess that's next. Not able to get any voltage reading at this point.

[x-pro]

When connecting AC120V, does U608 work? Is there +15V Control output on C619?
Also, what is the voltage on the waters + and - D601 when AC 120V is supplied?
You will not be able to repair unless you take the required measurements and display them here.
Repair in this case is two-sided!
To ensure the correct operation of the device during the repair, no sound signal is given, speakers are not connected to the output connector.

[ca7922303]

When connecting AC120V, does U608 work? Is there +15V Control output on C619?
Also, what is the voltage on the waters + and - D601 when AC 120V is supplied?
You will not be able to repair unless you take the required measurements and display them here.
Repair in this case is two-sided!

Not getting any voltage @ TP601/603 when 120vac supplied.

[ca7922303]

When connecting AC120V, does U608 work? Is there +15V Control output on C619?
Also, what is the voltage on the waters + and - D601 when AC 120V is supplied?
You will not be able to repair unless you take the required measurements and display them here.
Repair in this case is two-sided!
To ensure the correct operation of the device during the repair, no sound signal is given, speakers are not connected to the output connector.

What does "waters +" mean?

[x-pro]

Didn't change C645 again yet and I'm getting(0.8 mvdc) across TP601-TP603.

is it DC voltage?

"What does "waters +" mean?"
diode bridge D601 has 4 pins +DC, AC,AC, -DC

Leave the C645 alone if it carries it so beautifully ...
It's not needed for repairs.

[ca7922303]

is it DC voltage?

"What does "waters +" mean?"
diode bridge D601 has 4 pins +DC, AC,AC, -DC

Leave the C645 alone if it carries it so beautifully ...
It's not needed for repairs.

D601(+86vdc/124.3vac/178mvac/-86vac)
more coming

[ca7922303]

When connecting AC120V, does U608 work? Is there +15V Control output on C619?
Also, what is the voltage on the waters + and - D601 when AC 120V is supplied?
You will not be able to repair unless you take the required measurements and display them here.
Repair in this case is two-sided!
To ensure the correct operation of the device during the repair, no sound signal is given, speakers are not connected to the output connector.

C619(-74/-87vdc)
U608 1(-65vdc) 2(-105vdc) 3(n/a) 4(+87vdc) 5(-71vdc) 6(-71vdc) 7(-71vdc) 8(-71vdc).

[x-pro]

Repair will be long....
The voltage measurements in the primary part of the power supply are made with respect to the minus pin of D601, not with respect to the case of the device.
Maybe you measured relative to the common connection of capacitors C610, C611.
This is not correct.
Measurements of the secondary part are relative to the case of the unit.
It is desirable to observe polarity of the voltmeter probes according to the polarity markings of the parts on the schematic. This is very important!!!
If on the D601 diode bridge output you have 168V voltage, then contacts 3-4 of the relay K600 have no connection.
Further actions will require a skill in the soldering of cmd elements. The assembly of the components is very tight in some places. If you unsolder the parts you can damage the printed circuit board.
Simply replacing these parts does not immediately result in the correct operation of the product. Often it takes a good measurement and an understanding of how the circuit works.


Translated with www.DeepL.com/Translator (free version)

[ca7922303]

I seems that you are saying do not measure D601 to ground, but use the (-) pin on D601 to measure the other three(3) pins of D601. Is that correct?

[ca7922303]

Repair will be long....
The voltage measurements in the primary part of the power supply are made with respect to the minus pin of D601, not with respect to the case of the device.
Maybe you measured relative to the common connection of capacitors C610, C611.
This is not correct.
Measurements of the secondary part are relative to the case of the unit.
It is desirable to observe polarity of the voltmeter probes according to the polarity markings of the parts on the schematic. This is very important!!!
If on the D601 diode bridge output you have 168V voltage, then contacts 3-4 of the relay K600 have no connection.
Further actions will require a skill in the soldering of cmd elements. The assembly of the components is very tight in some places. If you unsolder the parts you can damage the printed circuit board.
Simply replacing these parts does not immediately result in the correct operation of the product. Often it takes a good measurement and an understanding of how the circuit works.


Translated with www.DeepL.com/Translator (free version)

D601(169vdc/60vac/61vac) using #4 pin(-) for ground.

[x-pro]

If the output of the diode bridge D601 has a voltage of 168V, then contacts 3-4 of the relay K600 have no connection.
The relay does not turn on when AC120V is applied

[ca7922303]

If the output of the diode bridge D601 has a voltage of 168V, then contacts 3-4 of the relay K600 have no connection.
The relay does not turn on when AC120V is applied

So replace K600 relay?

[x-pro]

If your network is always AC120V, the K600 is not needed there at all.
But the outputs of 3-4 relays should always be interconnected.
This is, of course, a radical solution, but a real one.
There is no need to unsolder the relay. Just connect pins 3 and 4 of the relay to each other.

[ca7922303]

If your network is always AC120V, the K600 is not needed there at all.
But the outputs of 3-4 relays should always be interconnected.
This is, of course, a radical solution, but a real one.
There is no need to unsolder the relay. Just connect pins 3 and 4 of the relay to each other.

Appreciate your help! Will connect pins 3/4 on K600. Report back shortly.