Question about Philips 51PP9303H Rear Projection Television

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Philips 51pp9303h/17 dptv345 chassis no audio or video

This tv has no audio or video. I have replaced the two stk392-120 ic's and it still does it. The kit includes 12 one watt resistors which the tv does not have. The tv makes a chirping sound i believe from the power supply board. Can anyone help me?

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  • andthehorseu Apr 14, 2009

    I changed the convergence ic's. It is impossible to change the 1 watt resistors when my tv doesn't have them. Whoever put the kits together obviously doesn't know what resistors the tv's have. Mine has 5 or 6 watt resistors and there is about 6 of them not twelve.

  • andthehorseu Apr 21, 2009

    This tv doesn't have a HOT. I have a service manual in pdf format. It's just difficult to read on my monitor because it's so wide. I think i'm going to just have to check the voltages until i find the problem. With so many people having the same problem with this tv, i figured someone was bound to know the problem and save me a lot of time.

  • andthehorseu Apr 22, 2009

    This tv does not have a HOT. It has 2 FET on the power supply board and 1 on the ssb that make up the horizontal output. This is what philips told me and i have the service manual for it also. I'm going to have to go through and check the voltages. It just difficult because the manual is in pdf.

  • andthehorseu Apr 24, 2009

    To Nobody295, you're an idiot! You have no idea what you're talking about. There are no 1 watt resistors. This tv doesn't have your "traditional" HOT nor are they with the HV generator. The horizontal output on this tv is made up of 2 FET on the power supply board and 1 FET and a TOP246Y ic on the main board.

  • andthehorseu Apr 24, 2009

    I would be more than happy to email anyone who thinks they know everything a copy of the schematic. I have repaired several projection tv's and never been stumped by one before like this one has me. I spent all last night checking the voltages and they were all correct.

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First- What have you checked ( voltages) It sounds from the chirping that the set is in HV shut down. I would probably check the HV Horiz Output transistor for a short. If it is shorted you can disconnect the collector and the short will be removed then the B+ will come up briefly as you monitor it. There has been many cases of the Blue CRT cracking and shorting out the mentioned transistor. If you have never worked on this chassis before I don't think you and I can repair it over the net, unless your a tech also. You can also take a flashlight and look into the blue crt closely for a crack line. It will be noticeable. If it is I suggest not repairing it because I doubt if you'll find the tube. If the tube is not cracked then there are more voltages and resistance checks to determine where the short is. I know this sounds complicated but I'm a tech not just a Q/A person. Let me know if I can help any further.

Posted on Apr 21, 2009

  • Jim Krause Apr 21, 2009

    I'm sorry Sir. But yes it does, I worked for Philips for 14yrs. and every Analog tv ever made has a Horizontal Output and with yours it also has a High Voltage Horizontal Output. After your done checking voltages and scoping the power supply, let me know what you come up with so I can give you a hand, it will be my pleasure.

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You hot is part of the HV Generator. One piece. must change the whole generator. The resistors are there, if you dont know where to put them, you have no business trying to monkey with a $2000 tv when electronics veterans like myself put food on our tables by repairng sets. Another point, if you are not trained on proper ESD handleing precautions, your only going to damage more chips and you will end up paying more for a real tech to fix it, IF THEY WILL EVEN TOUCH IT AFTER YOU HAVE BEEN IN IT.

Posted on Apr 24, 2009

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The STK's were replaced because a problem in the convergence. This problem (convergence) in most cases allows you to turn on the set just the screen looks out of geometry (by the way the resistors are critical parts that fail together with the IC's. To get the tv back on is needed a check up in the power supply and other areas related to high voltage power supply.

Posted on Apr 14, 2009

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