Faulty MPF7409 PSU from Hitachi pd5200 plasma.

[japlytic]

Re: Faulty MPF7409 PSU from Hitachi pd5200 plasma.

Regarding the caps this is every thing written on it:

(M)
HC CE(M)
105 C
270UF
400V
Japan

Would the one you linked me to do the job, the only difference is the max temp is slightly lower 85 c as for all the other value's I have no idea.

The "M" logo is Panasonic, and the ripple current rating (all sizes of the 270uF 400V Panasonic HC Series) is 1.22A @ 120Hz @ 105C.
So be sure to get a unit with the same diameter and height.

[littlejon]

Re: Faulty MPF7409 PSU from Hitachi pd5200 plasma.

Thanks Japlytic, found one here:http://uk.rs-online.com/web/p/aluminium/7441795P/

Seems to match but the hight is 25mm on my PSU board there 30mm I guess this will not matter too much.

[littlejon]

Re: Faulty MPF7409 PSU from Hitachi pd5200 plasma.

If any one stumbles upon this thread and has the same problem I managed to fix it, the clicking problem under load was due to the 2 big caps on the middle of the board and not the inverter or coil.

[LDSisHere]

Re: Faulty MPF7409 PSU from Hitachi pd5200 plasma.

Good save!! Congratulations! Hopefully someone else will find this information useful in the future.

[tom66]

Re: Faulty MPF7409 PSU from Hitachi pd5200 plasma.

If any one stumbles upon this thread and has the same problem I managed to fix it, the clicking problem under load was due to the 2 big caps on the middle of the board and not the inverter or coil.

It is good that you fixed it and supports the theory that the caps going bad is causing the PFC to misbehave causing the clicking, thanks for posting the fix.