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Philips 60PP9202 TV chirping noise when powered up

 
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reynolds1971



Joined: 07 Mar 2007
Posts: 6
Location: San Antonio Texas

PostPosted: Wed Mar 07, 2007 11:52 pm    Post subject: Philips 60PP9202 TV chirping noise when powered up Reply with quote

I have a Philips 60PP9202, Chasis # DPTV305F, I recently changed the convergence I/C's on my 60 inch projection screen HDTV. It has worked great for about 6 months, no problems at all. Here the other day when I walked in the room the screen was blank and I heard a chirping/beeping noise coming from the set, and the front red pwr light is on. I am an electronics tech, but I do not know much about tv's, however I am very familiar with semiconductors and most other electronic components, just not some of the tv parts, so please feel free to speak on a technical level. I unplugged some cables and powered on and off to try to isolate where it was coming from. The chirping is coming from the middle board in the set. However when I unplug the back connection from the convergence board to the middle board, I assume high voltage power board, and power back on the chirping stops. Also when I isolate the convergence board the tubes power up and my screen comes up white, only for a few seconds. I was wondering if the convergence i/c's could have gone out again, could it be the power going to the convergence board. I have checked all fuses resistors and diodes on the middle board and they all seem to be ok. I noticed there are some fets on the high middle board. I noticed another multipin semi conductor in the area of the convergence i/c's. Any help would be appreciated......Have a great day! I'll be spinning in circles until I find something or someone maybe can point me in the right direction My 60" TV had too good of a picture to get rid of, another 60" costs tons of money now....HELP!!!! Thanks in advance for your time.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Fri Mar 09, 2007 1:12 am    Post subject: Reply with quote

If it's chirping, it usually means the convergence ic's. You could have got knock off ic's when you bought them. I'll bump my convergence ic post back.
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reynolds1971



Joined: 07 Mar 2007
Posts: 6
Location: San Antonio Texas

PostPosted: Fri Mar 09, 2007 1:34 am    Post subject: Reply with quote

Thanks, I will get the sanyo brand, that is what was in there, they were STK392-120's. I bought my first set on ebay, and they did not have a name on them just the number they looked kind of generic. Is there a reputable place I can order them from, also do you know where I might be able to find schematics for this chassis.....thanks for your help, have a good one.
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PostPosted: Fri Mar 09, 2007 4:03 am    Post subject: Reply with quote

I pulled the convergence board, and upon further investigation, I found two bad resistors located in positions 3159, and 3160. They don't have a resistance value written on them but they do say 1 watt. They other resistors next to them have the same resistor number on them and they are 4 ohms, I would assume that these are the same 4 ohm value. All other resistiors and fuses check out ok. Should I try changing the two resistors and see if it works, or should I change the Convergence I/C's out as well????? I will await your professional opinion....thanks again, and have a good evening.

Richard
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sat Mar 10, 2007 6:42 pm    Post subject: Reply with quote

Change it all. I don't think sanyo sells 110's.
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reynolds1971



Joined: 07 Mar 2007
Posts: 6
Location: San Antonio Texas

PostPosted: Tue Mar 13, 2007 4:20 am    Post subject: Philips 60PP9202 TV chirping noise when powered up Reply with quote

Got it fixed. Just wanted to say thanks for the help, I couldn't have done it without your advice. I ended up changing the red i/c module, and the resistors and it fixed the multipoint problem I had. I pulled another resistor and they were 7.5 ohm, when I went to purchase them all they had were 8.2 ohm, so I tried them and it seems to be fine, does that little bit matter much? After adjusting the manual convergence and multipoint and saving it, it was fine. I also changed an electrolytic 470uf 200V capacitor on the middle board, it was pretty swollen on top. Anyway thanks again I really appreciate the guideance. Have a good week.

Richard
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PostPosted: Fri Apr 16, 2010 12:05 am    Post subject: Re: Philips 60PP9202 TV chirping noise when powered up Reply with quote

reynolds1971 wrote:
Got it fixed. Just wanted to say thanks for the help, I couldn't have done it without your advice. I ended up changing the red i/c module, and the resistors and it fixed the multipoint problem I had. I pulled another resistor and they were 7.5 ohm, when I went to purchase them all they had were 8.2 ohm, so I tried them and it seems to be fine, does that little bit matter much? After adjusting the manual convergence and multipoint and saving it, it was fine. I also changed an electrolytic 470uf 200V capacitor on the middle board, it was pretty swollen on top. Anyway thanks again I really appreciate the guideance. Have a good week.

Richard
Hay this is Joe I have the philips 60pp920217/f that i am working on. do you know by change the board number of the 470 uf cap that you replace.
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Fri Apr 16, 2010 3:01 am    Post subject: Reply with quote

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12389-ND
reynolds1971 wrote:
electrolytic 470uf 200V capacitor on the middle board


How many caps with that rating could there possibly be on the middle board?
At less that fifty cents ... Rolling Eyes
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