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Information Needed. PTK195M1T

Discussion in 'Electronic Repair' started by Jesse, Jul 7, 2006.

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  1. Jesse

    Jesse Guest

    I was given an RCA 61" projection tv, model # P61927 and the chassis #
    is PTK195M1T, because it no longer works. It looks like the coolant
    has leaked from one or all of the crts. I have cleaned all of the
    residue off of the main pcb and off of the large pcb to the right of
    it, don't know what it is called. I had to replace Q14401 / Q401
    because it was shorted, marked as C5148 replaced with NTE2234. Now
    when it is turned on I here a hiss from the lopt / flyback. The blue
    CRT doesn't light up and the picture is bowed at the top and the bottom
    is not recognizable. The convergence is also way off.

    I need to know how to check the level of the coolant and how to know if
    it is at a proper level.

    What voltages should I see at the B, C , E for Q14401 / Q401?

    How do I test the lopt / flyback?

    What cables have to be plugged in to avoid frying something while
    testing?

    How do I test the Blue CRT to see if it is it or if it is what drives
    it?

    Any other tips or information I should know?
     
  2. Motorman

    Motorman Guest

    Two ways --
    1. Pull the light box and look into the CRT or --
    2. Take the screen off and look into the CRT. Myself I would pull the light
    box and examine the CRT's to see how much leak out, then check you're power
    supply again. Pull the convergence power supply board and check to see if
    coolant leak on it. More than likely it has and shorted something on the
    board. The convergence pcb is located to right and again check under all
    componets.

    Coolant is like water and it runs everywhere so check under all the
    components where it leak. I had a Mitsubishi not long ago leak on the board
    and found coolant under the jungle IC.

    Best regards
     
  3. kip

    kip Guest

    On the 195,s the coolant gets under the eprom and also micro...not to metion
    the C/C socket...

    pull them all and clean thats the first thing you do with these.

    kip
     
  4. Jason D.

    Jason D. Guest

    C/C socket is? Just to understand.

    PS: it is best wash about 1/3 of the circuits (along the audio amp,
    micro and eeprom, regulators and vertical IC). Final rinse with
    distrilled water then speed dry with plenty of 99% alochol. Let it
    dry throughly or speed drying with hair dryer. Also check the
    convergence board as well, may have the coolant there.

    Cheers, Wizard
     
  5. kip

    kip Guest

    CC is Chipper Checker Socket..

    kip
     
  6. Jesse

    Jesse Guest

    Thanks for the info. I will not have any time to get back to this for
    a couple of weeks.

    Jesse
     
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