Philips LCD 42PFL5432D/37 - Bad PSU

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

I had the same issue on my Philips I replaced the bad caps but I still have the chirping noise and no standby light at all. I zeroed the noise down to an area but dont know how to go about repairing/testing it. It seems like it is coming from the yello block left of D (picture from first post) or the small reddish/brown thing just above D. Any help/insite on this would help.

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

It seems to be coming from the transformer next to D. Is there any way to replace that? Would that cause a chirping noise when plugged in? What do the numbers at the top of the transformer mean? 80tl37t912 ls
pph6012al
lse-b9 0747f2

[momaka]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Do you have a multimeter?
If so, use it to check if there is a stand-by voltage present. Using the picture from the first post in this thread, the stand-by voltage will most likely be present somehwere on that connector where the arrow for "D" is. Most of the time, the stand-by voltage is usually 5v or so.

If there is no stand-by voltage, replace the small green capacitor to the left of the transformer (if you haven't already done so). Also, what brand and series of capacitors did you use for your replacements?

A picture of your power supply would also be helpful.

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Well I had it check I was told it was the Transformer and I need a new psu. Before I buy a new psu, what are the chances it wrecked another board in this tv?

[dougsoxman]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

I just recently bought one of these tv's with what i believe to be the same problem. The larger caps look slightly bloated on the top. I also have the chirping noise and wasn't sure if that was related to the caps, or if the transformer is bad like someone else suggested. Did the original poster ever get his to work? Was it just the capacitors that you replaced? Thanks

[momaka]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Except in the backlight inverters, transformers very, very rarely go bad. With that said, there's a very big chance this power supply is repairable, and most of the time it's usually something simple too.
The chirping could be caused by a couple of reasons:
1) PSU tries to start but fails due to dry start-up capacitor (somewhat common failure and very easy to fix)
2) PSU tries to start but fails due to bad output capacitors (slightly more rare... however, this issue should have been eliminated if you replaced that cap on the bottom next to the connector with a proper low ESR one)
3) shorted output (not very common, but still easy to fix)

Well I had it check I was told it was the Transformer and I need a new psu.

If you had it checked at a TV repair shop, don't blindly believe in what they say. Most of them just swap the bad board with a new one and don't really analyze what have caused the failure in the first place. Moreover, the replacement board may have the same failure-prone capacitors, so you may end up with the same problems again down the road. Fixing your own power supply with proper, high-quality components is a much better way to go about this, and it's usually cheaper too.

Before I buy a new psu, what are the chances it wrecked another board in this tv?

Very small, but they do exist.
Nonetheless, I still think you should fix the old power supply (again, see above reasons). Start by posting pictures of your power supply. Get a multimeter too.

I just recently bought one of these tv's with what i believe to be the same problem. The larger caps look slightly bloated on the top. I also have the chirping noise and wasn't sure if that was related to the caps, or if the transformer is bad like someone else suggested.

Bloated capacitors are always a bad thing. Get them replaced first, then if needed, troubleshoot the power supply if it's still chirping.
My recommendation is the same as above - start by posting large, clear pictures of your power supply as well as the brand and series that is printed on each capacitor (if you're not sure how to obtain this information, just post all of the info you see on each capacitor). This will help in determining proper capacitor replacements.

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

thanks for the reply. He said the magnet around the transformer was broke and thats what was wrong with it. he should me it was by taking the tape off and a piece fell off it. I am assuming this was the problem, i didnt buy a new power supply yet I just wish there was a way to fix the transformer instead of spending $300 on a new psu I can get a multimeter but I didnt know what points to test and what not.

[momaka]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

thanks for the reply. He said the magnet around the transformer was broke and thats what was wrong with it.

I highly doubt that's the problem. This guy sounds like he doesn't know what he is doing (if he did, and if the transformer really was "broken", then he should be able to replace it and not tell you to get a $300 power supply). No offence, but the guy is probably just a typical board swapper.

Like I said, post some pictures of your board here and we can tell you what to measure with your multimeter and you how to troubleshoot it.

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

no offense taken, he doesnt do this for a living but he told me he new the basics about fixing electronics. He had me call the company for a new transformer and they said it cant be bought. He showed me how brittle the "magnet" is around the transformer by pushing the edge and it broke again. can I get a new magnet? I took pics of the board w/o the transformer I will post them when I edit the size of them. And again thanks for the info and help!

[PlainBill]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

no offense taken, he doesnt do this for a living but he told me he new the basics about fixing electronics. He had me call the company for a new transformer and they said it cant be bought. He showed me how brittle the "magnet" is around the transformer by pushing the edge and it broke again. can I get a new magnet? I took pics of the board w/o the transformer I will post them when I edit the size of them. And again thanks for the info and help!

With all due respect, I find this unlikely. A transformer usually consists of three parts - a core - in this case, ferrite; a plastic bobbin, and the windings. There is no 'magnet'. Ferrite is brittle, but usually the core of a transformer is quite hard - think of a clay pot. Pictures would go a long way toward convincing me that the part he broke off was of the core. To me, it seems far more likely it was the bobbin.

PlainBill

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Sorry I think what I called a magnet is the ferrite,lol. I dont know much about electronics. I dont think my friend means anyharm or trying to rip me off (didnt charge me anything) but I dont think he understands this much into it. Well here are the pics.

[PlainBill]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

I stand corrected. That certainly looks like the ferrite core is broken. The power supply is available for $75 online.

PlainBill

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

could you post a link or send it to me? I looked and only found one for around 240.

[PlainBill]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

could you post a link or send it to me? I looked and only found one for around 240.

I'm having problems finding it again. I found it by Googling either the part number or the TVs it's used in - it's also used in the 42MF437B. Alternate part numbers are 996500044559, ADPF24300R1P and 715T2432.

PlainBill

[Scenic]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

http://www.shopjimmy.com/philips-996500044559.htm

out of stock though

found this..
http://cgi.ebay.com/250742845392

[retiredcaps]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Well here are the pics.

For the 10 inline pics hosted offsite, please read the following

https://www.badcaps.net/forum/showpo...5&postcount=12

for future posts.

[momaka]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

I stand corrected.

As do I. My appologies for wrongly accusing your friend.

Yep, looks like it's time for a new power supply.

...Or is it?
I've always been a bit optimistic about fixing things, even if they have to be cobbled and kludged together in an ugly way sometimes.
Looking at this power supply, I'm pretty sure we can either wire it to an external power supply or reuse a transformer from another power supply to make it work again.
If you want to try any of that, post an overhead picture of the back (solder side) of the power supply so that I can see what kind of transformer and/or voltages this thing might need and how they can be wired.

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Sorry about the pics, Thanks for the links! I am willing to try anything so here is more pics (hopefully done right this time). I want to fix this for my son as a "gaming tv" so it doesnt have to look too pretty but safe I also have the service manual if that would help.

[momaka]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

Yeah, it looks like it should be do-able, since there's only a single output for the standby power.
Does the service manual have a schematic of the power supply? If so, this would be very helpful. We need to determine what output voltage is needed for the standby power. If you know how to read schematics, look up the voltages on the connector next to that 16v, 2200uF Rubycon PX capacitor.
Otherwise you can also post the service manual here or just take a screenshot (with Print Screen key) of the power supply schematic and upload that.
Lastly, can you tell me the part number of IC907? Thanks.

*EDIT*
Actually, just post a screenshot of the schematic if possible. I just saw something that needs to looked at in more detail.

[nuklear]

Re: Philips LCD 42PFL5432D/37 - Bad PSU

I hope I did that right lol. and this is what i seen in the "spare parts list" IC907 9965 000 43345 TEA1507P/N1. Again thanks for helping!