Phillips 47PFL6704D/F7 Blown Ceramic Capacitor

[johnboy1313]

I found this TV in the dumpster. I opened it up and found EY67, a 331K 1KV (330pf 1000V) capicitor, was blown apart and a large burnt mark on the board. I dug through my parts bin and found a 221k and a 102k and soldered them in parallel. The set powered right up. I then shut it down and unplugged it.

What would cause that cap to blow? What other component(s) would you check/change before buttoning it up?

Thanks

[johnboy1313]

Re: Phillips 47PFL6704D/F7 Blown Ceramic Capacitor

Back of board and my "fix". The tip of the screwdriver is showing EY67.

[budm]

Re: Phillips 47PFL6704D/F7 Blown Ceramic Capacitor

It is snubber cap connected to the Source and Drain for that MOSFET on the heatsink, ceramic cap failed in shorted mode and the voltage spike can be higher than the cap rated Voltage. I usually replace it with higher Voltage rating.

[johnboy1313]

Re: Phillips 47PFL6704D/F7 Blown Ceramic Capacitor

2KV or is that too much?

[Agent24]

Re: Phillips 47PFL6704D/F7 Blown Ceramic Capacitor

Voltage rating on the capacitor indicates how much voltage it can safely handle, you can't have "too much" - but you can have too little. The original one was 1kV so use a 1kV or higher. Do NOT use anything lower than 1kV!

A 2kV rated one would be fine.

[johnboy1313]

Re: Phillips 47PFL6704D/F7 Blown Ceramic Capacitor

That's what I figured. Thanks!