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Philps HDTV Hi, I got my hands on a hi voltage probe and meter. there is still hi voltage coming out of the flyback. What else do you think may be wrong with the TV?

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It could possibly be something in the deflection circuits. Exactly what are the symptoms when you try to power up the set? Have you tried to see if you can locate the Chassis number of your set, As a philips/magnavox is almost impossible to diagnose without that chassis number as all service info is crossed by chassis number.

Posted on Mar 29, 2008

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Sony KP-57WV700


Hi. It seems that the g2 voltage of the picture tube is too high, resulting in a white screen, often with white horizontal lines. The g2 (= second grid) voltage is derived from the flyback high voltage. The voltage divider is mostly integrated in the flyback trafo housing.(including the adjustment knobs). A failure in this divider may lead to this defect. The static you hear may come from sparking in the divider. The flyback trafo is soldered onto the main printed cirrcuit board. Sometimes, one of the pins sits loose in the soldering pads.
Turn on the set and observe for any sparking around the entire flyback circuitry, and, or the flyback trafo itself
The screen turns black after a while, as a too high beamcurrent is detected. The set disables the flyback. Stand-by blinks meaning that there is a fault condition.
Be carefull with the high voltages. The flyback voltage is very high (20-30 Kilovolts !) and may be lethal !!

Jul 02, 2012 | Sony KP-57WV600 57" Rear Projection...

1 Answer

Hi,im a technician and i got a problem with a Sony Trinitron Colour television model Kv-T29mn3. I replaced an Str, capacitors & Horizontal Output Transistor. Voltage output its okay but it keeps on...


These sets had alot of problems with bad FBT flyback tranfomers,You might need to change FBT.
Heres another thing they also had Bad Picture Tubes that will blow hori output and you will not know its the Tube untill you replace the FBT.Use a high voltage probe to monitor Voltage coming from the anode button, if you dont have a HVP then disconnect the CRT board and monitor set.

Jun 26, 2011 | Sony KP-57HW40 57" Rear Projection...

1 Answer

Panasonic pt-47wx53g horizontal outout transitor short whit new transistor flyback voltage are all to low the tv does notlight up the crt


Hello oncle_jc,

You may have a problem with your flyback transformer, I would suggest that you perform a ring test to see if any of your windings on the flyback are shorted. In addition You may want to also check the input to the Horizontal Output Transistor, to see if the driver pulses are of the proper amplitude. Besides these two things the only other issue colud the the high voltage trippler (if this is not part of the flyback). Check these things, you will need the following equipment:

1) oscilloscope

2) voltmeter (multimeter set to DC volts)

3) High Voltage probe

4) A test set that can perform a ring test (My shop uses the Sencore LC102)

Or what you can do is take the flyback out and take it to a TV shop and for a small fee they can run the test for you, (My shop usually charges $20.00 - $30.00 for this

I hope this helps

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 24, 2009 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

8 Flashes, Changed Flyback... still no good.


Try the High Voltage block first. Very common failure.

Jan 04, 2009 | Sony KP-57WS510 57" Rear Projection HDTV

1 Answer

RCA d52w20 will not come on


sounds likje the flyback those sets are famous for the flybacks needing replacement.They dont always blink 3 times when the flyback fails, often they justrefuse to power up.

Sep 30, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Flyback install


IT twisted off turn clock wise and wirer should come out red is easyer to remove,1 goes to high voltage tripper red black goes to focus&screen drive controls.

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2 Answers

Sony KP-53Hs30 projector tv


you will need two STK392-560 Convergence ICs and possibly a couple 3.5amp pico fuses. also if the small wire borke off inside the flyback you will need to replace the flyback as thats the wire for the focus control block. You can get the replacement parts at the following link with free installation instructions.
http://servicemanuals.vstore.ca/

Aug 21, 2008 | Sony KP-53HS30 53" Rear Projection...

1 Answer

Zenith


First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.Feel free to ask and post whatever the result of your troubleshooting..


Hope this may help;

Regards,
VOTIT

DON'T FORGET TO RATE

Aug 10, 2008 | Zenith R49W36 49" Rear Projection HDTV

1 Answer

R517 Burnt D" board


you will need the flyback as thats way to low. The HV splitter will only direct the HV to each of the CRTs it doesnt change or regulate the HV in any way just directs (splits) it. Let me know if you need any more assistance.

May 07, 2008 | Panasonic PT-47WX53 47" Rear Projection...

1 Answer

No picture no sound


First check to see if you have any voltage at test points with a digital meter.
You may need a repair manual for this.
Since you hear some noise your main fuse is ok.
Try checking this tp voltages first.
BE CAREFUL, wear gloves

Feb 15, 2008 | RCA HD52W56 52" Rear Projection HDTV

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