42PFL7422D/37 Service Manual Needed

[afrelientk]

Re: 42PFL7422D/37 Service Manual Needed

I have a Philips 42 inch 42PFL7422D/37 that I got from a friend. He said one day it just stopped working. There is no sound or picture. The little blue light does come on once I connect it to power but thats it. Turned all the lights off and there was no picture. I did connect a USB to it to try a firmware update and it definitely did read my USB because the USB lights flickered but that didnt help. I have checked all of the capacitors and have found no damage. The 820UF 250V capacitors were slightly bulged but the X imprinted on it was not. I have checked all the chips on it to see if any of them were burnt out but I found no damage. I have pulled this LCD apart and have not found any visible damage. Can anyone offer any advise for this? I have checked both inverters using an ohmmeter and I am getting 051 from all the blue capacitors on both of the inverters. I am lost and have no idea what to look for next. Any help would be greatly appreciated. Thanks@ Thanks!

[retiredcaps]

Re: 42PFL7422D/37 Service Manual Needed

I have a Philips 42 inch 42PFL7422D/37 that I got from a friend.

Posting the same query into multiple threads will not make people happy here. It confuses people and makes for a lot of extra work for everyone.

PlainBill asked you 2 questions in your original thread. You answered one and not the other. The one that you answered is also vague.

[afrelientk]

Re: 42PFL7422D/37 Service Manual Needed

Posting the same query into multiple threads will not make people happy here. It confuses people and makes for a lot of extra work for everyone.

PlainBill asked you 2 questions in your original thread. You answered one and not the other. The one that you answered is also vague.

I really didnt intend to upset anyone. I just know this feed has received alot of insight and was wondering if anyone here had any extra info that might be helpful.

[Dgtech]

Re: 42PFL7422D/37 Service Manual Needed

What are the resistances across the four fets on each inverter board?

What are the voltages on U33 on the mainboard?

[Rulahn]

Re: 42PFL7422D/37 Service Manual Needed

Hi guys, Found this very helpful but I am still having some problems. I have the 42PFL7422D/37 and the screen turns on with no lighting what so ever and you can ever so faintly make out the Menus and TV Logo. I popped it open to find I had bulging caps on the LCD Primary and Slave Boards. I replaced the boards with a vendor twice (the first set they sent me had a smashed capacitor). The second set of boards they sent look fine. I do not see any other visible bad caps or burnt chips. Any ideas what to try next?

[jftd10622]

Re: 42PFL7422D/37 Service Manual Needed

Let's start at the basics. Is the TV plugged into a working outlet?

PlainBill

Yes ! Plugged in ! After carefully hand-soldering the power / inverter board, I now have back light ! No video, audio OK on all inputs. Conclusion = bad T-con
PCB ..A parts supplier had it for thirty bucks ! Ordered today..# 55.42T02008 for
YA4 Chassis with panel T420HW01 v.4....( AUO = Chinese ).

I will post the final results....

Terry[/QUOTE]
Which components of the power/inverter board did you re-solder? I also have this set and it is the version without inverters and the only issue is no backlight. I can see a faint picture if I hold a flashlight to it and it also has sound so the only issue is the backlight not coming on so I was wondering how you fixed your power board. Any help is greatly appreciated.

[tibimakai]

Re: 42PFL7422D/37 Service Manual Needed

For anybody attempting to repair this board, this attatchment is a procedure that was created by Philips for also modding this board. The mod is not needed to make the unit work, but should stop future repeat failures.

I'm new to the forum.
Hi to everybody!
I have got this TV and I'm getting the repair kit as we speak(from coppel).
I would also like to make this mod, but I'm having difficulty finding these components.
Could somebody please help me with some specs on these? I'm not an expert, just beginning in this repair field.
Any help would be appreciated.

[Panama]

Re: 42PFL7422D/37 Service Manual Needed

Hi. I'm also a new to this, and seriously challenged by my 42PFL7432D/37. It has difficulty raising the LCD image. Often I have to leave it on to 'warm-up' for half an hour then restart it to get an image on screen. Then everything is fine until the next cold start - reminds me of the radio in in my first car.

It's the same configuration as the set described and pictured by Foreveraltared previously. It has no master/slave inverter boards, only the power supply board (delta-dps-168ep / at shopjimmy.com it's the Philips 272217100586 Power Supply) and the main SSB board ( at shopjimmy it's Philips 310432852162 SSB )

I've checked it over visually pretty carefully, but can see no physical flaws although I haven't taken the boards out to look at the undersides yet. I've checked all the connectors and fuses, but I haven't taken a meter to it yet as I'm not sure where to start.

I see that others have had very similar problems with this unit and I'm hoping to get direction for my next best move. I suspect that it's not worth the time to hire someone to fix it in our disposable economy, but I feel I ought to do my part to make it last.

Thanks in advance for any thoughts you think will help.
Pete

[selldoor]

Re: 42PFL7422D/37 Service Manual Needed

Welcome to the forum- I dislike the title on this thread but its the one with most info in!
We can help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Example
https://www.badcaps.net/forum/attach...1&d=1290283049

It helps if you can say what your electronic knowledge/skills are - practice a bit with your meter make sure battery is good- do you have soldering equipment.

[Panama]

Re: 42PFL7422D/37 Service Manual Needed

Thanks. My skill levels are dated, but I can usually take on a challenge like this successfully. My multimeter is an old analog - reliable, but maybe limited in setting options. I have the necessary soldering equipment and will pick up any supplies that seem necessary for this job. I do not have a scope or a capacitor tester - hopefully I won't need one.

I double checked the image with a flashlight on cold startup. Previously I thought there was no image, but in fact it is there, just not lit up.

I've taken out the two boards and have attached pictures. The fuses test fine but now I probably need further direction if possible .

Thanks

[budm]

Re: 42PFL7422D/37 Service Manual Needed

OK, you power board is a combination Power supply/Inverter board. Do you happen to have chassis number of this 42PFL7432D/37, Philips sometime will use the chassis number.
I will look for service manual for it, at least right now the 5VDC (it may use 12v) standby is working.
Can we see the closed up pictures of the connectors on the PWR/INV board, I can see some labeling on them.

[selldoor]

Re: 42PFL7422D/37 Service Manual Needed

The pictures are excellent - thankyou- wish all looked this clear. On the main board are the blue caps Lelon brand -they seem to fail quite a lot and may cause the problem you have described, as when they warm up they work a bit better.
I think we might struggle to find a SM as it didnt turn up earlier in the thread. The main
board is used in a few sets Compatible models:

PHILIPS 47PFL5432D/37 PHILIPS 47PFL7422D/37
PHILIPS 47PFL7432D/37 PHILIPS 52PFL7422D/37

Board Part Number:

310430350842D 310431361962D
820400458882 820400458892

Manufacturer Part Number:

Philips 310432855232 Philips 310432853762 Philips 310432852301

I would start listing these lelon caps ready to order.


EDIT just noticed the BIG black cap on the main board is also a Lelon (lemon) Next time you have all the boards back together try heating this big cap with a hair dryer and see if it comes on quicker - you can try the same with the group of blue lelons as well. (allow to cool between the two tests.

[tonym182]

Re: 42PFL7422D/37 Service Manual Needed

Hi

Would a nice person supply me with a bios password for a Dell Latitude E6410.
I have forgotten mine - I know, unforgiveable....
My tag is 150WWN1-2A7B

Many thanks

Regards

Tony

[selldoor]

Re: 42PFL7422D/37 Service Manual Needed

@TonyM
Why on earth have you posted this here - if you can still edit it please delete as much as possible and post in the correct section

[retiredcaps]

Re: 42PFL7422D/37 Service Manual Needed

Often I have to leave it on to 'warm-up' for half an hour then restart it to get an image on screen. Then everything is fine until the next cold start - reminds me of the radio in in my first car.

1) There are 3 brown caps in the upper left hand corner of the power board. I know they are probably United Chemi-con due to a little crown symbol on the sleeve, but I don't know what series they are. Can you list everything on the sleeve for each cap?

2) During the warm up 30 minute up sequence

a) what color is the power LED
b) is there sound
c) are the backlights on
d) does the on screen menu show up if you press the setup or menu button
e) are the backlights on
f) do you get a fuzzy or unclear picuture

3) Once the picture is clear and tv is working, does it come back properly if you turn it off and on very quickly (say less than 1 minute)?

4) Can we get pictures of the inverter board? Have you checked the caps on there?

[budm]

Re: 42PFL7422D/37 Service Manual Needed

@retiredcaps, his TV uses combo power supply/inverter board all in one. I see Vizio starts doing now also.

[tibimakai]

Re: 42PFL7422D/37 Service Manual Needed

soon we will have only one board in every TV.

[tom66]

Re: 42PFL7422D/37 Service Manual Needed

soon we will have only one board in every TV.

I have seen a combined inverter, PSU and main board on a single layer PCB in a HP monitor once! The only separate part was a small T-con, but that was bonded to the panel, so unreplaceable. Absolute crap.

[tibimakai]

Re: 42PFL7422D/37 Service Manual Needed

..and then they will seal the whole thing with that hard layer like in the IPMs.

[tom66]

Re: 42PFL7422D/37 Service Manual Needed

..and then they will seal the whole thing with that hard layer like in the IPMs.

Also, there will be a "trap switch" which detects if the case is open. And a light sensor which erases the firmware and initiates a self destruct sequence.