Question about Panasonic PT-47WX49 47" Rear Projection Television

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No power I have no power from Hot side. The power supply board is taken off from tv.When plug into a variac, power up, white wire(goes to fuse) measure normal. The black wire measured low(0.6v). TPD6 w.r.t. hot ground measured nothing.The only thing I've done is to de-solder Q801 becuase it diode tested abnormal in circuit.But tested correct out of circuit so I solder it back.What can be wrong? Thanks in advance.

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Re: no power
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Re: no power

Ypu will first have to check the horizontal output transistor and make sure it is not shorted. The voltage for the horizontal output transistor comes from pin14 of the SMPS transformer. Then it goes through the coil,L815, then to the diode for B+,D825. Then the B+ goes through coil L816. Be sure after D825 you check the capacitor, C830, as this is a very common fault with this set. Then the B+ flows through L817, then through two One ohm resistors, R857 and R858 to pin8 on the flyback transformer. If you get B+ on pin 8 of the Fly, and none on the horizontal output transistor, the fly is open and is bad. I have a schematic that is very close to this set but not an exact one, but most of these sets are about the same, and if you know anything about Panasonic TV sets, you should be able to repair them with a schematic from another set. BTW, this Horizontal and fly circuit is on the D board. If you wish to have a copy of the service manual for a set close to yours, I will send you a copy. If you follow these instructions, you should be able to find the fault with this TV set. If the SMPS is not working, you will not get any voltage also on the HOT. Good Luck

Posted on Jul 03, 2007

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RCA HD52W58 has a short somewhere in the deflection board

TL010 which is the HOT its attached to the heat sink directly in front of the flyback. Unsolder that and see if the fuse stops blowing.

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Do you have a picture of it? Be sure to look at the two five amp pico fuses on the Power Supply board (orange and look like resistors) which should be on far left side as you look from the back where the...

see attached photo of board (power cord goes to it and it is mounted on its side) the fuses are middle to right edge behind the plugs on the rear edge of the board.

Orange, 2 side by side and marked 5a each on the top of the board (5 amp)

Sep 26, 2011 | Sony KP-51WS500 51" Rear Projection...

1 Answer

Double image, top part bowed

This is an ITC 222 chassis and what happens is the flyback High Voltage transformer develops bad solder connections and blows a small fuse located next to it. To repair, first UNPLUG THE TV and after taking the back off the set look for the board that has the big red wire coming out of it and going toward the inside of the tv. The big red wire originates from the High Voltage transformer. Care has to be taken to remove the board which is clipped in by plastic tabs. Also remove plugs that hold the board back from turning the board upside down. Be careful with the two ribbons and remove and put back carefully. When you get the board turned upside down look at the connections at the bottom of the High Voltage transformer...they will appear to have rings around them which look like the solder it not connecting on some of the pins. After soldering the pins if you look just to the right of the transformer (looking at the component side) there will be a couple of small brown boxed shaped components. These are fuses. If you have an ohm meter and turn the board to the solder side again and measure continuity across each of these fuses and one of them could be open and not measure continuity. Since it would take a while to get a fuse like this I use a trick: I get an AC power cord and strip it back with my knife and get just one small strand of the copper wire and solder it over the bad fuse. I strand like this is about 5 amps. After doing all this put the board back in its place and plug up whatever you unplugged and turn the set on and the double image and bow should be gone. If not then you have a convergence power supply board bad which is directly above the board you fixed to the far left. But most of the time it is just as I mentioned: the solder connections and the fuse

May 21, 2011 | RCA HD52W59 HDTV Projection Television

1 Answer

Tv goes to stand by mode and does not come on

u have alot loose connection on the power supply board is the same deflection board , if u have same solder skill u can do this job , have in mind this require alot of time to do this job and know wicht connection to do but is better if u hire a tv tech todo thid kine of job

Apr 13, 2010 | Projection Televisions

2 Answers

I have heard a popping sound with tv going off a couple of times This time I cannot turn the tv back on. Is it worth fixing?

well that all depends on the cost of the replacement part vs that of a new tv.

It sounds as if the flyback (tansformer) part of the power supply circuit is shot. replacing the flyback can fix the problem, but there are still other things that could have blown such as a few capicators / resistors and diodes on the power supply circuit. and then they might have a few cracked solders as well.

Simply put you wont know if its worth it or not until u have it looked it, or attempt repairs yourself and get the cost of the replacement parts.

Mar 01, 2010 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

My mitsubishi ws65807 remote stopped working and also the front console buttons would not work, couldn't even turn unit off. Unplugged tv and plugged back in. Green light blinked 2-3 times and then...


the first three flashes when the set is plugged in indicate whether or not the microprocessor has initialized. The sections involved are the microprocessor, the standby power supply, and the buttons, LED, etc.

The most common causes I have found are the standby power supply, the front panel assembly, and CRT fluid leakage. Are you comfortable working inside the set? This may or may not involve measuring live voltages with a multimeter

If yes, the first step a technician would take is to remove the speaker grill(s) and then the front cover at the bottom. A quick check of the front panel is to simply follow the wires from the bottom of the screen assembly until you reach in-line connectors. Disconnect these (squeeze clip on the side of connectors) and then plug in the set and try the remote pointed at the screen. If the set powers up, then the front panel assembly is bad.

Also, inside the front, view the PC boards for CRT fluid leakage. The fluid is (originally) clear and is slightly thicker than water. Any fluid whatsoever, even a drop, can cause damage to the PC board. The fluid will cause any dust in the set to discolor; this may make it easier to spot (please look very carefully).

The next step is to check the standby power supply accessed through the rear of the set. The main fuse is suspect (F9D00), although not likely if you are hearing a sound when the set is plugged in. Two other fuses to check are pico-fuses in the standby power supply (F9A01 and F9A06). These are located on the center (Power) PC board, near the center of the board, toward the rear. If either of these are bad, then there is likely another failure that caused it. Of course, if any fuse is changed, please use the same value only (I have the manual to look up the values if needed).

If all these are good, then the next step is voltage measurement of the standby power supply. I will pause here and wait to hear your results.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Oct 13, 2009 | Mitsubishi WS-65807 65" Rear Projection...

2 Answers

I purchased a JVC LT52X579 March 30/09. The TV would phase out by itself and then restart by itself. Some times it would remain on and could be cut off only by unplugging it from my sudge protection...

Please unplug TV from wall socket for couple of minutes, replug back in and turn ON.
If still does not power up, try it in another wall socket.
Also check standby/ power light flashing or its solid at TV.
If standby light is flashing or its not lit then TV got power supply problem and requires qualified TV tech. I hope TV is still under warranty so ask for warranty cover to store.

Jul 24, 2009 | JVC Projection Televisions

1 Answer

TV cycles on and off but never fully turns on

Tv POwers on shows a picture then picture goes and audio stays on

Apr 14, 2009 | Philips 43PP9202 43" Rear Projection...

1 Answer

Power supply

you are so lost... a short in anything after the power supply will shut down the horizontal driver signal. first check to see if horizontal output transitor is shorted. If not it should have about 110 volts dc on it. if not go back to Power suppy ...many things start here...check to see if you micros got power a 5v heatseeked regulater is common bad. also the startup circuits can be the power suppy. I look for a kit online for power supplies ...they give you about every that fails. or you can start buying bet it is take to a professonal for you my freind havent a clue. CrazyLarry

Jun 27, 2007 | Panasonic PT-47WX49 47" Rear Projection...

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