Question about RCA 36V430T 36" TV

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RCA 36V430T will not turn on, Buzzing transformer 2127389A

My RCA 36V430T will not turn on. There is a buzzing sound coming from the 2127389A transformer. Can I repair it myself?

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  • dliptack Nov 14, 2009

    measured the horizontal output transistor, collector to emmitter resistance was infinite

    How do I measure voltage on flyback transformer?

    Note: buzzing is not coming from flyback transformer. It's coming from another large transformer. Would post pics, but not sure how. My pics are about 300kB

  • dliptack Nov 14, 2009

    measured the horizontal output transistor, collector to emmitter resistance was infinite

    How do I measure voltage on flyback transformer?

    Note: buzzing is not coming from flyback transformer. It's coming from another large transformer. Would post pics, but not sure how. My pics are about 300kB

  • dliptack Nov 14, 2009

    mulitmeter set to R 20M, measure 17M from emitter (red probe) to collector (black probe). resistance is infinite when reversed. Also infinite for all other resistance ranges.

    multimeter set to 200V, measured 0V between collector and chassis.

    got pics below 150kb. can't figure out how to post them here, any suggestions?

  • dliptack Nov 15, 2009

    Links to pics:

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

  • dliptack Nov 16, 2009

    I believe I located the horizontal output transistor. Here's a picture:
    http://s918.photobucket.com/albums/ad23/...

    measured 0 Ohms between collector and emitter. Should I replace this transistor? Is it possible that the horizontal output transistor is shorted because something else is wrong, like a bad flyback?The device in my TV is a Toshiba S2055N. Any reccomendations on where to buy this part? I found it on www.audiolabga.com, but don't know if they are a trustworthy distributor.

  • dliptack Nov 16, 2009

    not sure if the picture link worked, here it is again:

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

  • dliptack Nov 16, 2009

    I believe I located the horizontal output transistor. Here's a picture:
    http://s918.photobucket.com/albums/ad23/...

    measured 0 Ohms between collector and emitter. Should I replace this transistor? Is it possible that the horizontal output transistor is shorted because something else is wrong, like a bad flyback?The device in my TV is a Toshiba S2055N. Any reccomendations on where to buy this part? I found it on www.audiolabga.com, but don't know if they are a trustworthy distributor.

  • dliptack Nov 17, 2009

    Removed horizontal output transistor. Flyback looks good with no burns or epoxy

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Measured horizontal output transistor out of circuit. resistance is nearly zero from collector to emitter

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    picture of flyback showing red and black wires which go to CRT

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    measured voltage from HOT collector to chassis (braided wire the wraps around tube) +130V when initially powered, and +132V when TV power button pressed. Here's a pic showing measurement point on HOT collector (c)

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Various CRT and yoke pictures

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Picture of back of CRT board. Flyback black wire is connected to BB003. Also black wire from CRT board to braided wire wrapped around tube is BB004 position "AA 3" on board, which is also the point where I connected to chassis ground for voltage measurements.

    I also noticed a possible cold solder joint on a capacitor (CL021) near HOT

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

  • dliptack Nov 18, 2009

    measured diode shown in last posting:

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Blue-Brown wires from last posting goto this board:

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Blue-Brown-Red-White wires behind HOT heatsink go to interconnect board then to yoke. Note Blue-Brown-Red-White at interconnect correspond to Yellow-Brown-Red-Blue at yoke:

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Just purchased HOT (S2205N) which arrives in 2-5 days from:
    http://www.electronix.com/catalog/produc...

    Wasn't able to resolder components near HOT and Flyback, will do tomorrow

  • dliptack Nov 19, 2009

    Solder looks good, resistance check ok on items 1,2,3. Couldn't find TO-3P package part, but found T0-220FP ST's IRF630FP at TL101

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Expanded view of board behind/near yoke teminal (exhibit A). Yoke terminal board moved for better view:

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    Your last picture: resistance check on DL121, DL122 is 132.2 ohms

    www.electronix.com called and S2055N HOT is on back-order, my order was cancelled. Couldn't find the part on www.encompassparts.com. Searching for a new distributor. May try www.audiolabga.com

  • dliptack Nov 19, 2009

    Just ordered S2055N HOT from www.audiolabga.com, not sure how long it will take

  • dliptack Nov 21, 2009

    The S2055N HOT (qty. 2) just shipped. I should have the parts by 11/24.

  • dliptack Nov 23, 2009

    Touched up solder joints around chopper and HOT.


    Also measured 3.15A fuse FZP60 (OK) and RP068 4.7 Ohms (measured 0 Ohms). I'll try to find a 4.7 Ohm resistor to replace.


    I should receive two HOTs in two days. Should I solder the new HOT into the circuit and power up, or are there some tests I should run first?

  • dliptack Nov 23, 2009

    Touched up solder joints around chopper and HOT.


    Also measured 3.15A fuse FZP60 (OK) and RP068 4.7 Ohms (measured 0 Ohms). I'll try to find a 4.7 Ohm resistor to replace.


    I should receive two HOTs in two days. Should I solder the new HOT into the circuit and power up, or are there some tests I should run first?

  • dliptack Nov 24, 2009

    RL037 (measured 215 Ohms) and RL038 (measured 217 Ohms). Color code says 220 Ohms.

    [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

    RL010 (measured 0 Ohms) and RL012 (measured 0 Ohms). I think this is OK because I think my multimeter can't measure 0.22 Ohms and 0.100 Ohms accurately.

    Found a resistor to replace RP068 (4.7 Ohms). It's 4.64 Ohms. Let me know if this isn't OK, then I'll look for an exact match.

  • dliptack Nov 25, 2009

    Got the S2055N (qty 4) in the mail today. It's now soldered in place.

    Used my 4.64 Ohm +/- 1% resistor in place of 4.7 Ohm at RL068. Will power-up tomorrow when I have time to monitor.

  • dliptack Nov 25, 2009

    New S2055N installed, removed connection to yoke (exhibit A), connected TV to power. Measured 130V between S2055N collector and chassis. Heard hissing noise. Held for 2 minutes. S2055N did not get hot.

    Turned on TV (power button) and S2055N blew. 0.0V between collector and chassis. Removed part which is now shorted between collector and emitter.

    Installed a new S2055N. Any suggestions?

  • dliptack Nov 25, 2009

    I have 3 spare S2055N HOT's, including the good one in circuit.

  • dliptack Nov 28, 2009

    Made a few more measurements with new HOT. Also TV plugged into power but not turned on, connection to yoke removed (exhibit A), and black terminal on multi-meter connected to chassis ground (braided wire). Before DP080 voltage fluctuates between about 19V and 23V. After DP080, 131.9V. After DP061 19.7V. TL033 collector 10.75V.

  • dliptack Nov 28, 2009

    With yoke disconnected, new HOT, and TV plugged in but not turned on, I measure 0.0V at RL007, RL010, RL012, DL011, DL013, and DL040. As soon as I turn on TV the HOT pops (don't hear sound on speakers or see dot on screen). Installed a new HOT (only one left after this one). Here are some pics of CRT board, bad HOT's, RL007, possible flyback damage?, DL040 connection to CRT board [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG] [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG] [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG] [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

  • dliptack Nov 29, 2009

    With yoke disconnected, new HOT, and TV plugged in but not turned on, I measure 0.0V at RL007, RL010, RL012, DL011, DL013, and DL040. As soon as I turn on TV the HOT pops (don't hear sound on speakers or see dot on screen). Installed a new HOT (only one left after this one). Here are some pics of CRT board, bad HOT's, RL007, possible flyback damage?, DL040 connection to CRT board [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG] [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG] [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG] [IMGhttp://i918.photobucket.com/albums/ad23/...[/IMG]

  • dliptack Nov 30, 2009

    Resoldered joints in steps a), b), c). Resistance between base and emitter of original S2055N is 41.5 Ohms. DL010, DL011, DL012, DL013 do not appear to be shorted. Soldered original S2055N base and emitter to board (bent collector out of way). Measured 0V (-0.007V) between base and chassis. I have a 100W incandescent light bulb. Where should I connect it? If there is a bad tripler diode do I need to replace the flyback? Is it part of the flyback assembly?

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