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

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Power supply Hi, I took the power supply board out of the tv went home and pluged into a variac tried to measure some voltages from test points. But I could not measure anything at all. It was working while in the tv. I then traced the voltage started from where the ac goes into the board.On the white wire and it's related components always measured 7v and the black wire side goes to the fuse and all componets always measured 105v(or whatever I cranked the variac up). There's a varistor between the white/black wire.I am not sure it's good or not. My question is whether it is correct to take the board out and do service as it may not be grounded correctly. Any advices are much appreciated. Pete

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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 tricky...in the power suppy. I look for a kit online for power supplies ...they give you about every that fails. or you can start buying boards...best bet it is take to a professonal for you my freind havent a clue. CrazyLarry

Posted on Jun 27, 2007

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Posted on Jan 02, 2017

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Call for warrenty repair,the power supply board it dead.The components call capacitors it dying and leakage of gases.

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1 Answer

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Hello,

The power light may be flashing or if you are runing with a series light bulb it may be cycling on and off continuously. There may be a chirping or clicking sound from inside the set. (Note: using too small a series light bulb load during testing for the size of the TV may also result in this condition.)

If there is a low voltage regulator or separate switching supply, it could be cycling on and off if the horizontal output, flyback, or one of its secondary loads were defective.

Does this TV have a separate low voltage regulator and/or switching power supply or is it all part of the flyback circuit? For the following, I assume it is all in one (most common).

Some simple things to try first:

Verify that the main filter capacitor is doing its job. Excessive ripple on the rectified line voltage bus can cause various forms of shutdown behavior. An easy test is to jumper across the capacitor with one of at least equal voltage rating and similar capacitance (make connections with power off!).

Use a Variac, if possible, to bring up the input voltage slowly and see if the TV works at any point without shutting down. If it does, this could be an indication of X-ray protection circuit kicking in, though this will usually latch and keep the set shut off if excessive HV were detected.

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1 Answer

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Hello,

The power light may be flashing or if you are runing with a series light bulb it may be cycling on and off continuously. There may be a chirping or clicking sound from inside the set. (Note: using too small a series light bulb load during testing for the size of the TV may also result in this condition.)

If there is a low voltage regulator or separate switching supply, it could be cycling on and off if the horizontal output, flyback, or one of its secondary loads were defective.

Does this TV have a separate low voltage regulator and/or switching power supply or is it all part of the flyback circuit? For the following, I assume it is all in one (most common).

Some simple things to try first:

Verify that the main filter capacitor is doing its job. Excessive ripple on the rectified line voltage bus can cause various forms of shutdown behavior. An easy test is to jumper across the capacitor with one of at least equal voltage rating and similar capacitance (make connections with power off!).

Use a Variac, if possible, to bring up the input voltage slowly and see if the TV works at any point without shutting down. If it does, this could be an indication of X-ray protection circuit kicking in, though this will usually latch and keep the set shut off if excessive High Voltage were detected.

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1 Answer

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Hi my name is Roety,
I can help you with your issue ,
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If disconnecting boards restores these voltages the suspected boards must be replaced .
Tech labor is about $250 plus parts.
Suspected boards
power supply
Y sus main & Y buffers  
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panel
 
 
If I have helped you with your issue
If you have more questions you can still respond
I will reply asap
Thanks

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1 Answer

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Good Day;
Make sure when measuring voltages that your'e on the proper ground, all TV's this day has two grounds. The HIT has #'s near the components, LED's that light or do not light. YES, get info to trouble shoot further.
Good Luck, big IRISH.

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1 Answer

Lightning strike


Good Day;
Make sure when measuring voltages that your'e on the proper ground, all TV's this day has two grounds. The HIT has #'s near the components, LED's that light or do not light. YES, get info to trouble shoot further.
Good Luck, big IRISH.

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