Philips 32PF5521D/10 Stuck in Standby Sortof

[tom66]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Startup cap is a ~10-100uF 16-50V cap on primary supplies Vcc for controller.

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Startup cap is a ~10-100uF 16-50V cap on primary supplies Vcc for controller.

can you be a little more specific please?
the psu board has 4 supplies ranging from 24V to 3v3,
the SSB board (which features "a contoller" or Hercules according to the service man) about 5 (supplies) i think, and the IBO board another 5 or 6.

"~10-100uF 16-50V" is pretty vague for supplies ranging from 24V to 1V2 wouldn't you say!

[selldoor]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Not sure if you think I am joking about the hair dryer ? just type hair into the search
( search by post not thread )above and see how many hits you get.

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Not sure if you think I am joking about the hair dryer ? just type hair into the search
( search by post not thread )above and see how many hits you get.

No! it's got just as much logic behind it as the can freezer spray i have, i've just never come across it before!

[tom66]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

can you be a little more specific please?

On PSU there will only be a few caps on primary side. These are mostly start up caps and can cause the symptoms you describe.

[selldoor]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

C505 or C130 look to be the only two

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

C505 or C130 look to be the only two

Are we at crossed purposes here?

I don't see either of those references on the psu board. the other boards all have 4 digit designators

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

are they on the underside? the schematics available through electrotanya seem to omit the 32" supply board?

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

and anyway if the psu fires up & the outputs are all nob on, why am i looking for a cap on the psu board?

[selldoor]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

They are on your picture in post 3 or is that not your board?

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

They are on your picture in post 3 or is that not your board?

My Apologies, they are there after all.
What i'm failing to understand here is why your suggesting i check these components. If they were bad, the supply would not start. if the supply did not start i would be hard pushed to have verified the outputs on a scope already?

a few posts back when i said "The same damn fault as before", that included being able to hot-wire the backlight into firing up, again a difficult thing to do if the supply board is not working?

[tom66]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

My Apologies, they are there after all.
What i'm failing to understand here is why your suggesting i check these components. If they were bad, the supply would not start. if the supply did not start i would be hard pushed to have verified the outputs on a scope already?

a few posts back when i said "The same damn fault as before", that included being able to hot-wire the backlight into firing up, again a difficult thing to do if the supply board is not working?

No. The startup cap provides power to Vcc. If the startup cap dries out, Vcc will sag during power up. However, if the cap is feeling okay (warm) and the chip is also feeling forgiving, it *may* just about work occasionally. I suggest simply replacing them as they are 50p components.

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

No. The startup cap provides power to Vcc. If the startup cap dries out, Vcc will sag during power up. However, if the cap is feeling okay (warm) and the chip is also feeling forgiving, it *may* just about work occasionally. I suggest simply replacing them as they are 50p components.

Both measure well within spec.

Their are two caps on the psu board that are a bit close to the limit.
1- 120uF 450V on front end, measures at 110uF
2- 470uf 35v filters Vp (i think) measures at ~420uF

Neither of the above seem hugely significant, unless i'm missing a function of Vp, i believe it's only used to drive the audio amp,
Also and theirs no squealing audible at the front end, usual when the primary reservoir is duff

I still think the fault lies somewhere other than the psu board.
I pulled pins 10 and 11 (power down & standby) off the connector to the SSB, and managed to get 3 led flash codes out of the set.
1) "+12V from PSU error" - that figures as i had pulled the power good lead out
2) "+5V protection" - not sure what that means yet
3) "I2C error while communicating with ADC"
I'm not sure of the significance of any of these as when i put pins 10 & 11 back we were back to constant RED

[selldoor]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

When you say your capacitors are within spec, what are you testing them with. A capacitance tester or an ESR meter? The cap can pass a capacitance test but still be bad due to high ESR.
The hairdryer trick also relates partially to this as a heated cap generally has a lower ESR than a cold one. - did you try it?

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

When you say your capacitors are within spec, what are you testing them with. A capacitance tester or an ESR meter? The cap can pass a capacitance test but still be bad due to high ESR.
The hairdryer trick also relates partially to this as a heated cap generally has a lower ESR than a cold one. - did you try it?

one was 0.3 and the other was 0.7 ohms as measured with an PEAK Atlas ESR70.

[kueberco]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Check the PFC controller on backside of power supply board. Mine was part#L6562D Search philips 32pfl5322d/37 power supply. Page 8

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Check the PFC controller on backside of power supply board. Mine was part#L6562D Search philips 32pfl5322d/37 power supply. Page 8

Thanks, but i'm not sure how applicable that is to this fault. That PSU's of a completely different design, though mine does seem to feature a similar device in a similar location, it's not suffering a similar fault to that thread.

[kueberco]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Thanks, but i'm not sure how applicable that is to this fault. That PSU's of a completely different design, though mine does seem to feature a similar device in a similar location, it's not suffering a similar fault to that thread.

Power boards look almost identical.

[QuantumCheese]

Re: Philips 32PF5521D/10 Stuck in Standby Sortof

Power boards look almost identical.

Err, yea like an Audi Q7 looks like a Q5 if you take a few paces back.
they [the boards] were clearly designed by the same people.

water looks identical to vodka.... i could go on