Philips 42" 715T2432-2 issues

[Omyn]

My phillips 42" LCD is having power issues. Upon taking it apart and examining the power supply, I noticed 3 of the caps were bad. Replacing these 3 caps did not resolve the primary issue. The transformer in the center is producing a consistent repeating chirping sound every second or so. I've repaired leaking caps in the past but never had to deal with an issue like this. Any help is appreciated. Thanks

[PlainBill]

Re: Philips 42" 715T2432-2 issues

A chirping sound like that is often due to an excessive load, or a bad startup cap.

Which capacitors did you replace, and what brand and series did you use for replacements?

I notice three output connectors. Is there any indication of the function of any of the pins on the connectors?

Also, please read this post, then review your pictures in that light.

PlainBill

[Omyn]

Re: Philips 42" 715T2432-2 issues

A chirping sound like that is often due to an excessive load, or a bad startup cap.

Which capacitors did you replace, and what brand and series did you use for replacements?

I notice three output connectors. Is there any indication of the function of any of the pins on the connectors?

Also, please read this post, then review your pictures in that light.

PlainBill

I replaced the cluster of 3 with the caps found at this link

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT

One of the connectors goes to the power on switch which has an led. The led is lit and changes from red to green when pressed. The chirping only occurs when the power button is switched on. The power button turns green but the screen does not turn on.

As for the pictures, I apologize. I could not get my camera to cooperate with flash. The reflection took away everything that could be seen.

[PlainBill]

Re: Philips 42" 715T2432-2 issues

I replaced the cluster of 3 with the caps found at this link

http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWNX:IT

One of the connectors goes to the power on switch which has an led. The led is lit and changes from red to green when pressed. The chirping only occurs when the power button is switched on. The power button turns green but the screen does not turn on.

As for the pictures, I apologize. I could not get my camera to cooperate with flash. The reflection took away everything that could be seen.

If they are genuine, those caps should be excellent.

Good information. That points to a problem with the main power supply. It appears there is only one output from the main supply and the diode on the large heat sink at the top of the first picture rectifies it. Make sure that diode is not shorted.

Many of us have found that taking a picture during daylight hours without a flash gives the second best results. The best pictures came from someone who had his own indirect lighting setup, but most of us can't justify the space for something like that.

One other possibility is a short in the load. There is a popular line of inverters supplied by LG that are notorious for causing problems.

PlainBill

[rayrod81]

Re: Philips 42" 715T2432-2 issues

I have worked on quite a few of these LG Philips power supplies lately and have found that a shorted transformer is the culprit most of the time. Unfortunately you will not be able to find a transformer anywhere and have to replace the whole supply if that is the problem.

[Dgtech]

Re: Philips 42" 715T2432-2 issues

I'm just curious why three out of the four caps were replaced? Change the last one just to rule it out. Also, there are two diodes beneath the transformer that look like they took a little heat.

[cadiman]

Re: Philips 42" 715T2432-2 issues

I also have picked up a few tvs that were recapped and found bad diodes in the power supply.

The chirping is start up attempt as Plainbill said.

[edtv]

Re: Philips 42" 715T2432-2 issues

Exact same problem here...

Replaced all 4 caps then removed center transformer but I can't identify the diodes you speak of. I don't know if these pics are any better but would can point them out please?

[edtv]

Re: Philips 42" 715T2432-2 issues

Diode zd904 has short. Will replace and give update

[edtv]

Re: Philips 42" 715T2432-2 issues

Replaced three shorted diodes and same chrip. Not resolved. Left to believe the small transformer is at fault...

[skelator2112]

Re: Philips 42" 715T2432-2 issues

Ok guys I see all above was posted awhile back, hope someone has a fix for this other than replacing the entire power supply board. But still at 270 its better than a new set at over 1k. I replaced the 3 cap that were slightly domed,, issue continues, no pic and chirping ZD904 /02 look like there "might" be an issue there but as above I'm thinking (non-qualified) it might be the transformer last numbers in a string of ,, a lot,,, J737.

[VTWIN]

Re: Philips 42" 715T2432-2 issues

Hello Gents !

New to badcaps, found the site while looking for the caps \ repair kit, I also have the phillips 42 " TV. Changed the Inverter boards and no High V so no picture. I did not hear the "chirp" until I replaced the inverter bds. I can get the caps from my local shop but cannot find the suspect transformer and was wondering if anyone had either an OEM or a cross part ##. I am \ was a component level technician that has moved into network services for the school system I work for. Not exactly a TV tech but have repaired many. Have been in networking since 1985 so several yeaars in the component level industry and lots of radar equip repair in the navy. If anyone has any info on a lead for the transformer I am most grateful.

Thanks for the help

[VTWIN]

Re: Philips 42" 715T2432-2 issues

Hello RayRod81, you do not by any chance have specs on the transformer, maybe the OEM, or a cross reference ? I am not a tv tech but have repaired many, usually rear projection. Many certifications in network services but this TV has me in fits. After replacing the inverter boards I heard the chirp. Can you tell me if the PS has this particular fail if it affects the inverter boards ? I suspect now that my inverter bds are ok and not the problem at all. Appreciate your time man..

[edtv]

Re: Philips 42" 715T2432-2 issues

Im at wits end myself from working on this power supply. I purchased every part # I could find on mouser.com and will give it once last shot. I removed and tested the large transformer and it appears and look fine. I don't think it's the problem... I think it's in start up before it. Possibly at D924 or ZD906 or Q908. It makes more sense a chirp would come from a resistor or diode... I'm just hoping it's not the smps chip.

Do a google search for "50114604-philips-37-42-47mf437b-37-42-47pfl5432d-37-chassis-tpm2-0u-la-sm-ET-1" and you'll find the service manual with part numbers and schematics although, you won't find a part number on the transformer. Those aren't replaceable.

Good luck.

[colonelget]

Re: Philips 42" 715T2432-2 issues

I was just wondering if you ever got this board repaired. I'm having the same problem. I'm an electronics novice I can test components and solder but thats as far as my skill set goes. I bought a "repair kit" for the power supply from ebay. It was replacement caps for C951 C952 C953 and C955 and two replacement diodes for ZD902 and ZD904. I still get the same chirp as before.

[MR. TEACH]

Re: Philips 42" 715T2432-2 issues

I have worked on quite a few of these LG Philips power supplies lately and have found that a shorted transformer is the culprit most of the time. Unfortunately you will not be able to find a transformer anywhere and have to replace the whole supply if that is the problem.

I found the transformer, T904 (996510002520), at www.ued.net for $3.93. They have a huge list of parts.

[jak13]

Re: Philips 42" 715T2432-2 issues

I found the transformer, T904 (996510002520), at www.ued.net for $3.93. They have a huge list of parts.

Is 996510002520 for Transformer T904 or T905. Is there a way to check to see if the transformer is bad? I pulled diodes ZD902 and ZD904 and tested them both, they are both bad. Both shorted open reading 9 volts both direction.

[twnznz]

Re: Philips 42" 715T2432-2 issues

Do a google search for "50114604-philips-37-42-47mf437b-37-42-47pfl5432d-37-chassis-tpm2-0u-la-sm-ET-1" and you'll find the service manual with part numbers and schematics although, you won't find a part number on the transformer. Those aren't replaceable.

Good luck.

I would hate for someone to pay Scribd for this manual, so please find it at https://mega.co.nz/#!YhVy3DAb!bwGoHE...F00l__qMQfimTg

Did anyone figure out how to fix the chirp?

[mavrick2k]

Re: Philips 42" 715T2432-2 issues

has anyone traced the source of this problem down or even replaced the whole power board and get the tv working again. I am looking at this issue now. replaced the 3 caps and now getting chirping. dont want to waste time tracing down everything else on the board if this many people have not gotten it fixed. would be nice to know if replacing the entire board would fix it too.

[RON_CET]

Re: Philips 42" 715T2432-2 issues

I have used this power kit from ShopJimmy which fixes most of all the common issues on this board including the power supply "chirping" out of about 15 boards I've done haven't had replace any of the switch mode transformers mention in above posting see attached for kit