Philips 42PFL9632D/10 inverter failure

[PowerAmpFreak]

Hello. Set came in with sound but no picture. Found a blown control-IC (BD9897FS) on the slave inverter board. The slave and master inverter boards are sold as a pair very reasonable priced, but the question is does the blown ic indicate a failure elsewhere and risk to blow the new boards?
Or can I summarize this as ordinary part failure?
Thanks!

[Dgtech]

Re: Philips 42PFL9632D/10 inverter failure

Without pictures, I'm assuming that these inverters are the ones that have been made for several sets and is a common failure as seen here in my post (#29):

https://www.badcaps.net/forum/showth...974#post129974

After seeing about two sets with this same failure, I quickly purchased about 10 of those chips on ebay (BD9897FS). You can replace the chip for about $10 or replace one board for $50 plus shipping. Some replace both boards as a pair but I dont buy it. Keep the repair as cheap as possible.

[Dgtech]

Re: Philips 42PFL9632D/10 inverter failure

but the question is does the blown ic indicate a failure elsewhere and risk to blow the new boards?

I also wanted to add that there is a known defect either in the chip or in the circuit design.

I replaced a chip on the slave board on one set with the same exact symptoms - sound but no picture. Then about six months later, the same set had no sound and no picutre. This time the master board had that chip blown instead of the slave. Again the chip was replaced and it's been working for about a year now. Bad batch of chips?? Who knows. I have a feeling that keeping the brightness & contrast lower on these sets will reduce the rate of failure of these chips.

[PlainBill]

Re: Philips 42PFL9632D/10 inverter failure

I also wanted to add that there is a known defect either in the chip or in the circuit design.

I replaced a chip on the slave board on one set with the same exact symptoms - sound but no picture. Then about six months later, the same set had no sound and no picutre. This time the master board had that chip blown instead of the slave. Again the chip was replaced and it's been working for about a year now. Bad batch of chips?? Who knows. I have a feeling that keeping the brightness & contrast lower on these sets will reduce the rate of failure of these chips.

Somewhere around here is a link to a circuit modification LG has ordered for these inverters. I would think that performing that mod would be a very good idea.

PlainBill

[PowerAmpFreak]

Re: Philips 42PFL9632D/10 inverter failure

Buying the chip alone from my dealer is 30$, buying a pair of new inverter boards is 72$ so I will chose the pair of new boards. Hopefully the mod is done to these new boards.

[Dgtech]

Re: Philips 42PFL9632D/10 inverter failure

Buying the chip alone from my dealer is 30$, buying a pair of new inverter boards is 72$ so I will chose the pair of new boards. Hopefully the mod is done to these new boards.

Wow. Dealer my ass. Theres no deal there. I found one on Ebay for 4.25 plus 2.50 shipping = grand total of 6.75. If that's not worth it, I dont know what is. $6.75 vs $72 for new pair of boards is about ten times the cost. The mod usually will not be done on the boards. They are usually direct replacements.

Here is the post where it has the modification plans for the inverter board. #48
https://www.badcaps.net/forum/showth...t=10215&page=3