Question about Philips 55PP9352 55" Projection Television

6 Answers

Philips 55PP9352 Rear Projection, no picture or sound, chirping.

I have read several of the other posts with a similar problem. My questions are, how do I locate the bad HOT (Horizontal Output Transistor) or Flyback. I think I can repalce these myself, if someone can tell me where they would be located on the boards and how to test them.

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  • 3 more comments 
  • cooperstor_j Nov 16, 2008

    I am not an electronics expert or I would not be asking here. However, I am aware of the electrical hazards involved. I am an IT manager so I do similar work on computer hardware. I just need to know where to locate these parts on the boards, how to test them, what devices to test them with, I can post pictures of the boards if needed. I also have a PDF of the service manual for this chassis model.



    John

  • cooperstor_j Nov 16, 2008

    How do I test if the HOT or the flyback is bad? What is the procedure for removing a flyback?

  • cooperstor_j Nov 16, 2008

    Have already tried other power circuits. Also power supply is fine. I am looking for a step by step procedure for testing the HOT and flyback and how to remove / replace the flyback.

  • cooperstor_j Nov 16, 2008

    I found in the service manual how to get to the TV to diplay the error codes through the front power LED. When I did this it looks like I am getting error 22 which is, according to the service manual: Flash protection (detected via Bocma).

    What is this?

  • cooperstor_j Nov 16, 2008

    "The fact that you are asking how to perform basic forward and reverse bias test on a transistor, thinking that you could test an FBT as well as how to desolder their joints tells me that you are unfamiliar with electronics. Might I suggest that you reconsider performing a DIY, it is not highly recommended at this point."



    I paid the premium service fee to find out the problem, and get a step by step guide on how to fix it. Not to be criticized and judged that I am unfamilar with electronics. Also, being told repeatedly to leave it to a professional. Okay, then what good is it speanding money here? I am asking for a refund, and I go elsewhere to get help with this problem.


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SORRY in rhis case Gohead with aa good technician and not advisable
If you are not A electronics expert.
if you do a small mistake it will spiol other things(other companents) Also
so pleaseconatact A qualified TVEngineer.
Wish you all the best.

Posted on Nov 16, 2008

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  • Master
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The following instructions are to measure the HOT. I would suggest to de-solder it from the circuit and test it outside the circuit.
The FBT can only be tested if you have the schematic diagram, but you will also have to remove it from the circuit to test the internal windings.
With the meter set to measure ohms, clip one meter lead to the base connection of the transistor.
Touch the other lead first onto the collector lead and then onto the emitter lead.
The readings should both be the same, either both high resistance or both low resistance.
Now reverse the leads and repeat the procedure.
The results should be the opposite of those obtained before.
If they were both high before they should now be both low.
If they were both low before they should now both be high.
Now measure the resistance between emitter and collector.
It should read high resistance in both directions.
If you don't know the transistor connections consult a data book.
If you cant find the data then measure between the three connections in both directions.
You should now be able to identify the base connection and then decide if the transistor is OK.
Note that for this to work the internal battery of the meter must supply a voltage high enough to overcome the forward resistances of the transistors.
Many meter have a position marked with a diode symbol which must be selected when checking transistors or diodes.
Note that NPN transistors have low resistances where PNP have high, and vice versa.

Posted on Nov 16, 2008

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Its a high voltage device and is risky to handle repairs without a proper technician

Posted on Nov 16, 2008

  • fixyy Nov 16, 2008

    well,to check if the fly is good is not easy without a testing tool called a ringer, and you have to take it out of the circuit, you can resolder all the pins no hurt, to work on the set you have to discharge the big caps on the board go here.
    http://riddledtv.com/repair/journal/Disc...
    Also continous blinking of the standby red light may mean
    No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path maybe defective.
    Also the hot maybe bad test it.maybe q601 not shure.

    Go here and read these articles;
    http://www.techlore.com/articles;jsessio...

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Check your power suply waltage and fluctuation.aslolo check earthing is working properly.try at your projection at other places.

Posted on Nov 16, 2008

  • kishor khatri
    kishor khatri Nov 16, 2008

    check your diode. and transistor.diode has 2 legs and transistor has 3 legs.u can test with amp read carefully those diode how pass amp.then test that proper ampear is flowing from them when u givr voltage.

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  • Master
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Hi,

Initially, access to a service manaul (Chassis # DPTV310) or at the very least a schematic diagram with voltage readings would be of great help. This is of course assuming that you have a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. If you have confirmed that it is either the horizontal out transistor (HOT and/or the flyback transformer (FBT), pls reference the image below. It may not exactly be what is in your Philips. Again, pls be reminded that their are dangerous and fatal voltages inside.
Philips 55PP9352 Rear Projection, no picture or so - 74af15d.jpg
Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.


Posted on Nov 16, 2008

  • Louie  Role
    Louie Role Nov 16, 2008

    Hi again,

    Appreciate the quick postback and thanks to Ekse for commenting on it.

    To answer your questions:


    • How do I test if the HOT - some DVM/VOM have built-in transistor testers. Should this be not available, the three terminals of the transistor could be tested like a diode with forward and reverse bias. In some designs, the transistor has a limiting resistor connected to the base/emitter while in others, a damper diode is built-in to the collector/emitter. In some designs, a different type of transistor maybe used where the normal tests could not be applied. There are also instances where the test would yield false positive results and could be verified by checking for leaks at high resistance settings;

    • or the flyback is bad? - requires a ring' test, where an external instrument/device injects pulses to the FBT primary circuit and check its HV output as well as secondary voltages

    • What is the procedure for removing a flyback? - you would need a soldering iron and a desoldering tool. The soldering iron provides the heat to melt the soldering lead while the desoldering tool provides the suction to remove the melted lead.
    The fact that you are asking how to perform basic forward and reverse bias test on a transistor, thinking that you could test an FBT as well as how to desolder their joints tells me that you are unfamiliar with electronics. Might I suggest that you reconsider performing a DIY, it is not highly recommended at this point.


  • Louie  Role
    Louie Role Nov 16, 2008

    Criticizing and judging you was never the intent; please accept my apologies if you were offended. In my view, offering assistance also means that the information should not pose danger to the user hence the reminders of the potential hazard pursuing a DIY. Perhaps, as English is not my native tongue, I should have been more circumspect with my choice of words.

    Your initial concerns were:


    • where they would be located on the boards;

    • how to test them.
    To my belief, both were addressed.

    Should you still feel that your issues were not properly attended to, pls email premium.support@fixya.com for your subsequent request.

    I bid you luck in your repairs.


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Leave this high voltage repair to a professional.

Posted on Nov 16, 2008

  • Ekse Nov 16, 2008

    The flyback generates 20 000 to 30 000 volts for color TV tube.

  • Ekse Nov 16, 2008

    Benimur has posted you a picture and service manual, please press the repost link to get rid of my solution and view hes.


    Thanks and good luck.

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Hello miko_alexand,

That problem indicates that the Horizontal Output Transistor (HOT)is beginning to malfunction. I would suggest that if you have a background in electronics that you do the following:

1) unplug and open the back of the set

2) look for the HOT and locate the Collector, Base and Emitter of the transistor and using your multimeter set to read resistance measure from the collector to the ground, it should read high almost infinite, red from base to ground it should read low and from emitter to ground it should read low.

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This will tell you if the IHVT has suffered any damage from the HOT malfunctioning. You may end up having to replace both of the components.

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Shuttle83

http://www.electron-age-technologies-llc.com

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5f6e85c.jpg
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ee1ca68.jpg

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bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

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