42" Philips-Won't turn on

[JAWII]

I've had this TV a little over 2 years and it's done this a couple of times before (shoulda started looking for a manual then!) but this time after unplugging it and plugging it back in (that reset it before) it refused to turn on this time. The red light is on. I'm pretty sure this PS is common on several sets so if anybody has an idea and/or schematic I would very much appreciate the heads up. BTW it's a Philips Model # 42PFL5432D

TIA,
John W.

[PlainBill]

Re: 42" Philips-Won't turn on

Service manual is here.

PlainBill

[JAWII]

Re: 42" Philips-Won't turn on

Service manual is here.

PlainBill

I can appreciate that. That's why I love the web, share the knowledge! I really appreciate the manual even though I haven't looked at it yet. I did a search on the forum about this and didn't come up with anything, however on the web I saw it referred to many times so it's obviously a common problem. Have you seen anything relating to it? It's been about 17 years since I did any TV repair work, needless to say I'm a lil rusty and could use any help offered!

Tnx,
John W.

[PlainBill]

Re: 42" Philips-Won't turn on

I have very limited experience with Philips LCD TVs. I believe they use a common Small Signal Board (main control board) with the plasma sets. The service manuals for those sets had a detailed flow chart of the startup process.I have no reason to believe the service manual for your set would not have the same information.

Offhand, I would look if the small signal board is sending the power on signal to the power supply. Also, verify the standby voltage(s) are correct.

PlainBill

[JAWII]

Re: 42" Philips-Won't turn on

Ok will do. I went to look at that manual yesterday and it seems like they want to load all sorts of crud on my 'puter before I get it so I installed"Comodo time machine" so I can undo everything they want on here. Don't know if you've ever heard of that program or not but it beats PC restore hands down! Anyway thanks for the info and I'll post back when I either figure it out or need a lil more help. Hopefully it's the former rather than the later!

Tnx
JW

[JAWII]

Re: 42" Philips-Won't turn on

HMmm! I went to download this on my computer that still has XP on it and the service manual downloaded without all the other stuff I was seeing on my Vista 'puter, odd, huh? Anyway just thought I'd run that by ya. Again tnx.

[PlainBill]

Re: 42" Philips-Won't turn on

HMmm! I went to download this on my computer that still has XP on it and the service manual downloaded without all the other stuff I was seeing on my Vista 'puter, odd, huh? Anyway just thought I'd run that by ya. Again tnx.

Interesting. I'm running XP and don't have any problems with that site. Something to be aware of since I'm in the process of buildng a new computer that will be running Win 7.

PlainBill

[bobbyjay]

Re: 42" Philips-Won't turn on

I have 42inch plasma tv which turns on and then off repeatedly. sometime I unplug it and
the tv comes on, but it has got to where it want come on at all.

[PlainBill]

Re: 42" Philips-Won't turn on

I have 42inch plasma tv which turns on and then off repeatedly. sometime I unplug it and
the tv comes on, but it has got to where it want come on at all.

Sounds like a bad capacitor. Somebody smart would have mentioned the brand and model number of TV. The OP of this thread has an LCD TV.

I REALLY suggest you search this forum for the model number. If there already is a thread for your model, add on to it. If there isn't, start a new thread.

I can promise you that if you don't mention the brand and model number in a new thread, I WILL ignore it.

PlainBill

[JAWII]

Re: 42" Philips-Won't turn on

Sounds like a bad capacitor. Somebody smart would have mentioned the brand and model number of TV. The OP of this thread has an LCD TV.

I REALLY suggest you search this forum for the model number. If there already is a thread for your model, add on to it. If there isn't, start a new thread.

I can promise you that if you don't mention the brand and model number in a new thread, I WILL ignore it.

PlainBill

Bill I know your probably very busy and miss things going thru as much as you do but I did mention make and model at the very beginning of this thread. Also I think I mentioned somewhere that I did a search of both the model No. and the prob without any results, if not my apologies I meant to. I honestly try to use these boards for what they are meant to accomplish and try to achieve my goal with as little fuss and muss as I can. I really do appreciate y'alls time and help, if I miss something or omit something it's not intentional.
BobbyJay, This is exactly the problem I'm trying to resolve. Bill gave me the link to the schematic here earlier (much appreciated!) in the thread if your interested. I haven't finished trying to make a diagnosis yet but I'll post back. If you have any input on the schematic or diagnosis I'd be happy to here from you.

JW

[PlainBill]

Re: 42" Philips-Won't turn on

Bill I know your probably very busy and miss things going thru as much as you do but I did mention make and model at the very beginning of this thread. Also I think I mentioned somewhere that I did a search of both the model No. and the prob without any results, if not my apologies I meant to. I honestly try to use these boards for what they are meant to accomplish and try to achieve my goal with as little fuss and muss as I can. I really do appreciate y'alls time and help, if I miss something or omit something it's not intentional.
BobbyJay, This is exactly the problem I'm trying to resolve. Bill gave me the link to the schematic here earlier (much appreciated!) in the thread if your interested. I haven't finished trying to make a diagnosis yet but I'll post back. If you have any input on the schematic or diagnosis I'd be happy to here from you.

JW

JAWII, I note that you did, and I appreciate that information. One of the things I learned was that you have an LCD TV.

My problem was bobbyjay says he has a plasma TV, but didn't say what make or model. This could be a case of misidentifying an LCD as a Plasma, or hijacking a completely unrelated thread.

Troubleshooting from a distance as we do here is a classic example of Garbage In, Garbage Out. Depending on my mood when someone fails to give the basic formation I will resort to humor, sarcasm, or ignore the poster.

PlainBill

[grizzlly]

Re: 42" Philips-Won't turn on

Service manual is here.

PlainBill

Hi, I got 42PF7320 that won't power on. The service manual in the link above is in Spanish. Is English version available on the web? Couldn't find by googling.

Thank you.

[PlainBill]

Re: 42" Philips-Won't turn on

Hi, I got 42PF7320 that won't power on. The service manual in the link above is in Spanish. Is English version available on the web? Couldn't find by googling.

Thank you.

Elektrotanya shows three manuals. Do you have a blinking LED on the TV?

PlainBill

[grizzlly]

Re: 42" Philips-Won't turn on

Elektrotanya shows three manuals. Do you have a blinking LED on the TV?

PlainBill

I got the manual from different site, thank you. When TV is turned on - there is green LED on, but no sound or picture (HDMI connection from STB). Menu also doesn't show on the screen. When TV turned off - red LED doesn't come up.
A week ago I unplugged power for 2 minutes and the picture came on with few loud clicks in speakers, now it is dead.

[PlainBill]

Re: 42" Philips-Won't turn on

I got the manual from different site, thank you. When TV is turned on - there is green LED on, but no sound or picture (HDMI connection from STB). Menu also doesn't show on the screen. When TV turned off - red LED doesn't come up.
A week ago I unplugged power for 2 minutes and the picture came on with few loud clicks in speakers, now it is dead.

Strange problem. This set and it's brothers are notorious for a couple of popped caps in the power supply. It also is supposed to flash an error code for problems discovered during the start up process. The comment about the speakers reminds me that these sets used a class D audio amplifier which was known to short. I believe that would show up as a flashing error code. I wonder if the set has a very early version of the firmware.

PlainBill

[grizzlly]

Re: 42" Philips-Won't turn on

Strange problem. This set and it's brothers are notorious for a couple of popped caps in the power supply. It also is supposed to flash an error code for problems discovered during the start up process. The comment about the speakers reminds me that these sets used a class D audio amplifier which was known to short. I believe that would show up as a flashing error code. I wonder if the set has a very early version of the firmware.

PlainBill

The set is 5 years old, it is at my folks house and I will work on it this weekend. models is 42PF7320-28, firmware was not upgraded
will try AV connection and check power board for bad caps. Thanks for your help.

[PlainBill]

Re: 42" Philips-Won't turn on

The set is 5 years old, it is at my folks house and I will work on it this weekend. models is 42PF7320-28, firmware was not upgraded
will try AV connection and check power board for bad caps. Thanks for your help.

First big 'Gotcha'. Philips TV model numbers are fairly easy to decode. Let's look at this one. '42' says it's a 42", 'PF' indicates it's a plasma; '7x20' designates the chassis. The 'x' ('3' in this case) indicates added features to the basic model (probably Ambilight). The '7320' would often be followed by a letter, indicating revision level; the US version is rev D. And the last two digits are the country designation. The one I recognize is /37, the USA.

That last is important because the Small Signal Board ('Main board') will vary from country to country, as will the power supply. The SSB contains the firmware, and (of course), the diagnostic features.

Second, pictures are very helpful.

Lastly, PLEASE don't hijack threads. The original poster has a 42" Philips LCD TV. There is already at least one thread for the 42PF7220, there is no problem appending to that thread. Hijacking a thread such as you have done makes it more difficult too follow the flow of information.

PlainBill

[JAWII]

Re: 42" Philips-Won't turn on

First I want to apologize for my lack of work on this please forgive. it's a physical thing. Aside from that it seems to me even though the sets are somewhat different the root problem appears to be the same with a slight twist and that is that Grizzly's may seem to have some sort of diagnostic mode where mine doesn't even though his is older.

Bill your info on the breakdown of the model # is great where do u get that? Plus what's the difference between "PF" and "PFL"? Grizzly's is a - 42PF7320 and mine is a - 42PFL5432D, Actually I'm not sure any of that has to do with the problem as interesting as it is. I think our problem has something to do with what you pointed out earlier and that is a startup signal that I think we will find in common with both set's PS.

What is interesting is both sets won't come on after shutdown (to a standby state) till not having ANY power for a time. Mine did this very intermittently for over a year (till the warranty ran out, heheh) then one day it "locked up"... I unplugged it to "reset" it and it didn't work this time>>>

Well leaving it alone for about a week I decided to just for the hell of it plug it back in and see if it had "reset".. Well guess what.. It turned on!! Now if that isn't the result of a RC time decay I wasted a lot of years in electronics.
I think with a little further investigation we will find the same circuitry common in both sets along with the same chips. Don't know what they're using now but they used to be variations of 555 timers.

I really appreciate y'alls input on this and thanks Bill I know ur busy! Once I get this down I'll put in some pics of the boards.

JW

[PlainBill]

Re: 42" Philips-Won't turn on

First I want to apologize for my lack of work on this please forgive. it's a physical thing. Aside from that it seems to me even though the sets are somewhat different the root problem appears to be the same with a slight twist and that is that Grizzly's may seem to have some sort of diagnostic mode where mine doesn't even though his is older.

Bill your info on the breakdown of the model # is great where do u get that? Plus what's the difference between "PF" and "PFL"? Grizzly's is a - 42PF7320 and mine is a - 42PFL5432D, Actually I'm not sure any of that has to do with the problem as interesting as it is. I think our problem has something to do with what you pointed out earlier and that is a startup signal that I think we will find in common with both set's PS.

What is interesting is both sets won't come on after shutdown (to a standby state) till not having ANY power for a time. Mine did this very intermittently for over a year (till the warranty ran out, heheh) then one day it "locked up"... I unplugged it to "reset" it and it didn't work this time>>>

Well leaving it alone for about a week I decided to just for the hell of it plug it back in and see if it had "reset".. Well guess what.. It turned on!! Now if that isn't the result of a RC time decay I wasted a lot of years in electronics.
I think with a little further investigation we will find the same circuitry common in both sets along with the same chips. Don't know what they're using now but they used to be variations of 555 timers.

I really appreciate y'alls input on this and thanks Bill I know ur busy! Once I get this down I'll put in some pics of the boards.

JW

Yah caught me. Philips part numbers are more complicated than I thought.

If you go to http://www.hdtvsolutions.com/ and follow the link 'Search by Brand', then go to 'Philips' you will find a long list of models. 'PF' represents plasma, but so does 'HF'. 'PFL' represents LCD, but so does 'TA'. And 'PL' is for DLP.

You are correct, Phillips uses almost the same Small Signal Boards for both plasma and LCD sets. The major difference is firmware. And why not? In both cases, the panel is nothing but the display device, accepting the LVDS signal from the SSB.

PlainBill

[ben7]

Re: 42" Philips-Won't turn on

I have 42inch plasma tv which turns on and then off repeatedly. sometime I unplug it and
the tv comes on, but it has got to where it want come on at all.

Bad capacitor and/or a bad mosfet.

Typically mosfets go bad because of overheating when the caps fail to even out the output voltage.

-Ben