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No picture, no filament voltage, intermitent and distorted sound

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Check filament voltages taken from fbt check wheather fbt is genreting secondary voltages

Posted on Jul 26, 2009

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I have a sony KV-H21M80 telivison proplem is sound come no picture


Check whether the filament of the picture tube glows. If not, check all the solder terminals to CRT base socket. Check the serial resistor connected to the supply voltage to filament. . Check the continuity of filament with a multi-meter.If you are not familiar with electronics, do not attempt to repair! Whether you suffer fatal electrical shock! Instead, contact the nearest service center!

Jan 17, 2013 | Televison & Video

1 Answer

No video only sound on CRT TV


possible no filament lit in the neck of the picture tube (there are 3 and not real bright as source is only 6.3 volts.

Possible no High voltage but most that have sound have high voltage.

You are going to have to remove rear cover to LOOK--be careful and let me know what you find, if no filaments are lit it will be a easy fix and should be easy to find---if no filaments let me know.

Dec 17, 2012 | Televison & Video

1 Answer

Good sound no picture


A older set------look to see if display comes on (channel number or menu) if not someone has to look to see if the filaments in the three picture tubes are lit or not.

Several voltages : High voltage, screen voltage, filament voltage all go to the picture tubes.

Oct 30, 2012 | Sony KP-61V75 61" Rear Projection...

1 Answer

My rca tv has a distorted picture and a really high pitched buzzing sound


Problem is in High voltage circuit and likely either the high voltage transformer or a connection right under or around it.
6_17_2012_3_19_04_am.jpg

Jun 16, 2012 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Black picture on picture tube


No high voltage or no filament voltage and if no sound main power supply problems.

May 22, 2012 | Televison & Video

1 Answer

CRT no image, sound ok. What could cause this?


WE can presume if static electricity on screen you have high voltage (most sets will not have sound if no high voltage).

If voltages appear to get good:

TAKE A CLOSE LOOK IN THE NECK OF THE PICTURE TUBE: all these sets the filaments in the tube should be lit when the set is on.

All are 6.3 volts AC (two filament pins on crt board--one is the ground and the other the AC--use that ground and carefully.

If no filaments or very very dim (they will be hard to see) the source for the voltage (if no or low filaments) comes from the high voltage transformer to the crt----usually one of two issues in this case---a part has opened or gone way up in value (resistor?)

It is a very simple circuit---just follow it back as usually on board that plugs to crt you will see something like H1 and H2. Follow both back and look for a broken connection or an open part between the tube and the source.

Let me know what you find and ask if more questions.

Mar 20, 2012 | Televison & Video

1 Answer

When I turn on my TV I have sound but no picture


ths is a coman problum in tv it is a two type of problum solonution
[1]check filament voltage on crt base and check filament is on if not then Resolder filament ragistance or replace with new
IF filament is OK then ......
[2] check screen voltage hight more then normal and see the screen H line on the screen then problum is vartical section then check or replace capaceter /registance /vartical IC

Jan 30, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

Dark screen


the sound is locked off the TV good picture

Feb 20, 2009 | JVC AV-27320 27" TV

1 Answer

Sound but NO picture


Hello ashleewith2e,

This sounds like a high voltage problem or a picture tube issue (burnt out filament). I would first determine if you had high voltage at the anode of the TV by using a high voltage probe. If you do not have high voltage then I would suspect the voltage doubler, the IHVT (Integrated High Voltage Transformer) or the Horizontal Output Transistor (I doubt this only because you don't have a power supply failure and I would expect this in a modern TV since the high voltage supply is tied to the low voltage supply), the more likely suspect is the voltage doubler. Second possibility I would check is the CRT socket board and CRT filament. Unplug the TV and with a multimeter set to read resistance check to see if the filament pins read a low resistance if so the filament is good. Plug the TV back in and turn it on and check the voltage on the CRT board and compare them to the schematic values. These two tests should localize the issue. Now, If you have a background in electronics, this should be no problem to do, however if you do not have a background in electronics, I would suggest that you have a qualified TV technician troubleshoot and repair this TV set.

I hope this helps,

Thank you,

Shuttle83

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

Dec 01, 2008 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

Black picture but the sound works


1. i think filament voltage problem. please cheak the power supply output.

2. dry points on the neck board.

3. filament voltage diode or capacitor bad.

Oct 14, 2008 | Quasar SP-2723 27" TV

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