Re: Philips 55PFL5527 panel failure?

Sorry for replying to ancient threads, but I just had one of these on my table.

Picture was even worse, only the bottom fourth of the picture was visible. Culprit was the gate driver COF on the lower left hand corner which had burned and melted itself on the plastic frame. After snapping the cable free the picture was similar as seen in the first message of thread.

So an obvious panel fault. Took the box cutter and I cut all of the left hand side gate drivers off. Resulted in a good picture.

Don't know...

Re: Zalman ZM600-HP blowing PFC's



And the first option is the winner. CM6800G is indeed combined PFC/PWM -controller...
Have to inspect the circuit carefully, if there is a way the bypass the PFC part....

Re: Zalman ZM600-HP blowing PFC's



Ah, now I understand what you mean. Usually mounted with screws on the PSU case itself, because of the bulkiness.

Well, I did found one from the "scrap" -pile (though this one was connected before the rectifier - on the AC side - lower current through the coil when on AC side, right?).

Did connect it (and a new fuse and jumped the booster diode) -> Well at least I have +5VSB. Old CD-ROM drive was used as a "dummy load" and it kind of tries to start (when power on wire jumped to...

Re: Zalman ZM600-HP blowing PFC's



Yep, 230VAC - I think if I would have 115VAC, I would need to boost the voltage to APFC output...

I don't understand what you mean by "ordinary big passive" coil - to my eyes this APFC coil looks just like one Enameled copper wire wound around toroidal core.

I think I have few scrapped PSU:s lying around, I'll check those for parts, but I suspect that they don't have any PFC at all... or if they have, the coils can't handle the power. Though I'm not planning to rip the power out of the...

Re: Zalman ZM600-HP blowing PFC's



"This is a reminder" :P

But bad news altogether, there wasn't a suitable meter in my workplace (which I have access to).

And I was afraid of just that - that one shorted turn won't swing the Q-value/inductance that much that I could detect it without knowing the orginal values...

Stripping the FETs and the PFC booster diode would make the PFC coil act as a "passive PFC" limiting the current spikes (disabling the PFC-circuitry alltogether), am I correct? But in this...

Re: Zalman ZM600-HP blowing PFC's

OK, now desoldered the PFC heatsink and the coil.

What sparse info I have gathered, everything points out that this model should have 20N60C3 PFC FET:s, but in my case it seems to have IPP60R125CP fets.

I don't have a ring tester or inductance/Q-value meter - but possibly access to one. Does anyone have any idea what kind of values to expect, and possibly where to find replacement coil?

Re: Zalman ZM600-HP blowing PFC's

Hi,

Sorry for hijacking old thread, but I have a similar problem.

Zalman ZM600-HP (So FSP Epsilon I guess). Had blown the house breaker and so far I've found that the PSU fuse is also blown and one of the PFC fets (ref.des. Q12) seems to be shorted.

Haven't yet desoldered the PFC heatsink and components, but so far it seems that the PFC coil doesn't have any visible damage. But what I have understood, that there may be shorted windings which is not visible if the coil is not dismantled.

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