42PFL7422D/37 Service Manual Needed

[Dgtech]

Has anyone worked on one of thest Philips 42PFL7422D/37 LCD TV's yet?

I got one yesterday. It has sound but no picture. The guy I bought it from stated that this failed the same exact way before. A tech came to his house and swapped a board out it worked for a year then the same problem again, except now the warranty is gone. I have only been researching so far cause I'm stuck at work overnight - woohoo!!!. I have seen where some people have replaced master inverter boards or slave inverter boards. I have to do some testing to see which is bad. What's the chances one of you guys can find a service manual for this? I hate swapping boards and I'd like go to component level.

Pics of boards to come - as soon as I can get home and get sleep.

[kc8adu]

Re: 42PFL7422D/37 Service Manual Needed

bad transformers.iirc this one uses those peopleworks inverters.common failure.

[Scenic]

Re: 42PFL7422D/37 Service Manual Needed

http://english.electronica-pt.com/el...ind=42PFL7422D
^ lists the chassis Q523.1U LA

http://www.electronica-pt.com/index....einfo/id,7600/

haven't checked it though..

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

Here are 2 pics. I see there are some inverter boards on ebay for this model. Must be a very common failure just with that little board.

By the way, thanks for the service manual. Seems to be the exact match.

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

To replace both inverter boards costs about $130 on ebay. After spending about an hour on this, I found a burned chip (BD9897FS) on the slave inverter board. In the pics below, pin 26 (VCC) is fried. I checked and the VCC reads 24.2 VDC. Is anyone familliar with this chip?? Is this a common failure? I sure hope I can find this chip - loads cheaper than buying both boards.

[PlainBill]

Re: 42PFL7422D/37 Service Manual Needed

To replace both inverter boards costs about $130 on ebay. After spending about an hour on this, I found a burned chip (BD9897FS) on the slave inverter board. In the pics below, pin 26 (VCC) is fried. I checked and the VCC reads 24.2 VDC. Is anyone familliar with this chip?? Is this a common failure? I sure hope I can find this chip - loads cheaper than buying both boards.

Amazing what a little searching will do. B&D Enterprises has them in stock at $20 each. Both Digikey and Mouser list them as a special order item at about $3 each (quantity 2000).

PlainBill

[el3ctroded]

Re: 42PFL7422D/37 Service Manual Needed

Datasheet:

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

Thanks guys for the assistance. I have 3 on order from ebay. They cost me $5.50 a piece with $4.40 shipping = $20.90
I hope it doesnt take too long for shipping. This 42 inch LCD takes up too much space on my work bench. I'll update post once parts come in.

[Scenic]

Re: 42PFL7422D/37 Service Manual Needed

if those light blue caps are what they look to be (lelon) -> get rid of them too (once you got that toasted chip fixed up)

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

FINALLY!!! I got the chip in to fix this. After replacing (BD9897FS), the unit works. Now comes the hard part. I have to decide whether to keep this unit OR the Panasonic 42 inch plasma that never gave me any trouble.

Panasonic 42 Plasma - 2006 Manufacture date - 720P

Philips 42 LCD - 2007 Manufacture date - 1080i

[Jetfixxr]

Re: 42PFL7422D/37 Service Manual Needed

FINALLY!!! I got the chip in to fix this. After replacing (BD9897FS), the unit works. Now comes the hard part. I have to decide whether to keep this unit OR the Panasonic 42 inch plasma that never gave me any trouble.

Panasonic 42 Plasma - 2006 Manufacture date - 720P

Philips 42 LCD - 2007 Manufacture date - 1080i

Keep them both....
Jet

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

Well, I ended up selling it. I bought it for $80 and parts cost me $20. Sold it for $400. I'm now looking for the next unit.

[retiredcaps]

Re: 42PFL7422D/37 Service Manual Needed

Well, I ended up selling it. I bought it for $80 and parts cost me $20. Sold it for $400. I'm now looking for the next unit.

Wow, I'm surprised any informed buyer would pay $400 USD for a used 42 inch TV.

In Canada, you can buy a new 42 inch plasma or LCD for about $579 + taxes + environmental fee. AND if you buy from Costco, you get a 90 day return and a 2 year warranty.

Good for you to make $300. And I would have kept the plasma vs LCD!

[fastvideo]

Re: 42PFL7422D/37 Service Manual Needed

Wow, I'm surprised any informed buyer would pay $400 USD for a used 42 inch TV.

In Canada, you can buy a new 42 inch plasma or LCD for about $579 + taxes + environmental fee. AND if you buy from Costco, you get a 90 day return and a 2 year warranty.

Good for you to make $300. And I would have kept the plasma vs LCD!

This killed the repair business and created too much garbage in Canada.
The environmental fee should be 30% to 40% on top of the selling price if they really care about the environment.

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

Being that I made the second repair to this model LCD TV (the first one was a warranty repair - board level only), my store bought Panasonic Plasma was the logical choice. I never had any problems with it yet and the speakers were better. Over all though, my wife told me no! - TRUMPED

[Jetfixxr]

Re: 42PFL7422D/37 Service Manual Needed

Well, i will take the meter to the boards and then make a decision on buying the boards or changing the chips.
Jet

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

Can you post a picture of the master and slave boards? I want to see if they are the same and have that same chip.

By the way, they sell a repair kit for this TV on ebay. Do a search for the model number and you'll find that this is a very very common failure.

[Foreveraltared]

Re: 42PFL7422D/37 Service Manual Needed

OK - I am obviously going to be a newbie to this... I have a 42PFL7422D/37 and I do not see an inverter board. I did find a T-con board, but where everyone else's pics show a panel next to the SSB, I have a flat surface. Could it be that my TV doesnt have an inverter? Basically I have the typical (or so it seems) Philips sound but NO picture. Any advice would be very much appreciated. Thanks so much!
B

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

If you post picture of the whole TV opened up, I can view the picture and show you where the inverter boards are located. There were about 3 different models of this same model number.

[mockingbird]

Re: 42PFL7422D/37 Service Manual Needed

That IC must have taken you a while to desolder.