Question about Pioneer SD-643HD5 64" Rear Projection Television

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Piomeer 643hd5 Simple question, tv powers up, tubes have heater on, sounds there no video???? bad Flyback maybe?

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  • Pioneer Master
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No sounds like either the vertical output IC needs resoldering or maybe defective. vertical IC will make the tubes shutdown for safety while audio and Crt heaters will remain on. Try resoldering the IC if that doesnt help replace the vertical output IC its an inexpensive part. If you need more assistance please let me know

Posted on Apr 10, 2008

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No picture but i have sound on my RCA F32676SB 32"


You do an adjustment on the screen nob on the flyback transformer?Resolders the CRT-(tv tube) YOKE wires R,G,B connections to the main PCB board?Resolders the video board CRT-(tv tube)video board pins sockets that connect the video board and the CRT-(tv tube) together.

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1 Answer

I have audio, but no video, what's up? last night I was watching, and the picture went out, I truned off the TV, then restarted it...the picture came back. Today I tryed to turn it on and no picture, just...


s the audio coming from the TV's internal speakers, or from an external sound system? In the 169 series chassis, if the power supply caps or secondary rectifier are bad, or if the high voltage splitter has shorted inside, the set will not run and there will be no picture or sound from the TV. If the picture is completely black but the TV still has audio, press the menu button and see if the menu comes up on the screen. If the menu is there, check your cables on the back of the TV. If you are using a cable or satellite box, the box could be bad or the video wire could be bad or loose. If you do not get the on-screen menu, then I would guess that the solder joint next to the flyback transformer that sends filament (heater) voltage up to the picture tubes has cracked, or the low value resistor in the heater circuit has opened up. If that is the case, have the set serviced by a qualified tech familiar with the 169 series chassis.

Oct 17, 2008 | Televison & Video

1 Answer

There is no picture on screen i can turn the power on and off thats all i can do i cant change the channel go to menu or anything else


Is the audio coming from the TV's internal speakers, or from an external sound system? In the 169 series chassis, if the power supply caps or secondary rectifier are bad, or if the high voltage splitter has shorted inside, the set will not run and there will be no picture or sound from the TV. If the picture is completely black but the TV still has audio, press the menu button and see if the menu comes up on the screen. If the menu is there, check your cables on the back of the TV. If you are using a cable or satellite box, the box could be bad or the video wire could be bad or loose. If you do not get the on-screen menu, then I would guess that the solder joint next to the flyback transformer that sends filament (heater) voltage up to the picture tubes has cracked, or the low value resistor in the heater circuit has opened up. If that is the case, have the set serviced by a qualified tech familiar with the 169 series chassis.

Oct 15, 2008 | Televison & Video

1 Answer

Tube tv no power. buzzing sound when plugged in and gone when unplugged


Hi
You mean a CRT type TV. What is making the humming sound is the power supply. You probably have two problems, one the HOT is bad and the flyback and two an electrolytic in the power supply is bad. You'll need to take this to a reputable repair person. However, the price of the HOT, flyback and at least one electrolytic will be more than a flat screen monitor at Wal Mart. Unless this monitor has some kind of sentimental or mission critical value, I would just a new one.

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1 Answer

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at the horizontal deflection yoke! maybe you have defective flyback! or horizontal yoke!

Sep 20, 2007 | Mitsubishi WS-55807 TV

1 Answer

Tv wont come on


Most times when you hear this kind of sound on a TV it is because the flyback transformer is bad (from what I can remember anyway!). Its been a while since I repaired TV's, so hopefully someone can verify my info. The flyback transformer steps up the voltage very high which powers the color tubes. If that is bad, you will get the thunk sound. Also, if memory serves me well, there is a high power output chip that could be bad as well. Please, anyone who knows TV's, please verify for me. It has been years for me!

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1 Answer

Picture and sound went out suddenly on a Sony KV-35S40


sony has problem with bad picture tubes as well as flyback transformers .if you have shorted hori output then replace it if set shorts it out again your looking at bad flyback transformer as well as maybe leaky tube.

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2 Answers

No pictureq


maybe you have defective heater line tru the CRT board! check the heater line if have a 4.5 volts or 4.8 volts! can you see the back of picture tube!?! they lights coming out at the neck of the tube! if no light! you have defective heater supply!

Oct 16, 2007 | Orion1934 19" TV

2 Answers

P52151WK 52" projection TV, no video


Is the audio coming from the TV's internal speakers, or from an external sound system? In the 169 series chassis, if the power supply caps or secondary rectifier are bad, or if the high voltage splitter has shorted inside, the set will not run and there will be no picture or sound from the TV. If the picture is completely black but the TV still has audio, press the menu button and see if the menu comes up on the screen. If the menu is there, check your cables on the back of the TV. If you are using a cable or satellite box, the box could be bad or the video wire could be bad or loose. If you do not get the on-screen menu, then I would guess that the solder joint next to the flyback transformer that sends filament (heater) voltage up to the picture tubes has cracked, or the low value resistor in the heater circuit has opened up. If that is the case, have the set serviced by a qualified tech familiar with the 169 series chassis.

Aug 26, 2007 | Televison & Video

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