Slow start up

[z]

I have the following symptoms on my panasonic tx-w28r3

Slow start up, getting progressively worse. I understand
this should be a dried out capacitor. Any ideas where
to look?

 

[Arfa Daily]

I have the following symptoms on my panasonic tx-w28r3

Slow start up, getting progressively worse. I understand
this should be a dried out capacitor. Any ideas where
to look?

Power supply. Suspect any small electrolytic positioned close to any
component which runs hot in normal use, including nearby heatsinks.

Arfa

 

[b]

z ha escrito:

I have the following symptoms on my panasonic tx-w28r3

Slow start up, getting progressively worse. I understand
this should be a dried out capacitor. Any ideas where
to look?

euro3 chassis.
be careful when poking around in the power supply. there are high
voltages stored there, in the main filter capacitor which can give a
nasty belt even when the unit is unplugged. If at all in doubt about
your ability to handle this , or solder , get the set to a tech.
-B

 

[Arfa Daily]

z ha escrito:


euro3 chassis.
be careful when poking around in the power supply. there are high
voltages stored there, in the main filter capacitor which can give a
nasty belt even when the unit is unplugged. If at all in doubt about
your ability to handle this , or solder , get the set to a tech.
-B

Absolutely agreed

Arfa

 

[z]

z ha escrito:


euro3 chassis.
be careful when poking around in the power supply. there are high
voltages stored there, in the main filter capacitor which can give a
nasty belt even when the unit is unplugged. If at all in doubt about
your ability to handle this , or solder , get the set to a tech.
-B

What sort of high voltage, 220v ? Which capacitor is that, the big
electrolytic one?

I already poked around, and I am still here, so maybe it alright
after all?

 

[Arfa Daily]

What sort of high voltage, 220v ? Which capacitor is that, the big
electrolytic one?

I already poked around, and I am still here, so maybe it alright
after all?

That's the cap. So long as the psu has started up, charge on that cap is not
normally an issue, as when you power off, the primary side circuitry will
keep drawing current from the cap until the voltage across it has dropped
low enough that psu operation can no longer be sustained. The problem comes
if the psu has not started up. That cap will be charged to the peak voltage
of the line power - around 360v in the uk, but less in the US - and it will
remain so after the power has been removed. A cap in good condition can stay
charged enough to give you a nasty belt for hours, and in some cases days,
after removal of power. Bear in mind also, that this voltage is derived
directly from the line power, with no isolation or current limiting, other
than the input fuse, so is potentially lethal.

Arfa