Philips 60PP9202 TV chirping noise when powered up

[reynolds1971]

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.

[minnie]

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.

[reynolds1971]

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.

[Guest]

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

[minnie]

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

[reynolds1971]

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

[Guest]

[jts1957]

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