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No filament voltage to one of the tubes. - Audio Players & Recorders

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Could be a wiring problem or a PCB problem.
Maybe it's a dirty or broken tube socket.
If the other tubes are glowing, it must be one of those problems.


Posted on Jan 12, 2010


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How to check filament in tv

If it has a picture tube first look with set on, three tiny filaments will be lit if good, not real bright as 6.3 volts ac voltage across two pins on the actual tube.

If you can see them lit they are ok---most sets mark them on the board at the end of the neck for the picture tube with H for heater.

Very carefully as high voltages on the board measure for 6.3 volts AC across those pins. If for example its 3 volts that is too low and the voltage from those pins can be physically traced back to the High voltage transformer creates it off two pins.

less than 12 connections between source and the board on the tube, if missing voltage at the tube follow it back--a single cracked or bad solder connection can cause this.

Dec 22, 2012 | Televison & Video

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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.

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Sonykv32s20 screen wont turn on, stays dark, but sound works

Its a older set, if you are able to open safely and run set JUST look to see if the faint filaments in the neck of the picture tube are lit, 6.3 volt filaments, and if they are not somewhere between source at High voltage transformer up to the PC board and socket at end of tube neck you have either a broken/bad solder connection or a open part--only about a dozen connections/parts between the two----set will have a ground and a voltage source at both ends of this chain, a bad solder connection will do this if filaments not lit(3 of them in neck of tube).

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1 Answer

My rca hdtv does not have picture only voice

Some possible causes:

No filament voltage to the three tubes.

No high voltage to the tubes.

The set is also prone to bad connections at and around the high voltage transformer.

6_12_2012_3_39_43_pm.jpgit is also called a FLYBACK.

Jun 11, 2012 | RCA HD52W56 52" Rear Projection HDTV

1 Answer

My rca hdtv does have voice perfectly fine but no picture at all.

Some possible causes:

No filament voltage to the three tubes.

No high voltage to the tubes.

The set is also prone to bad connections at and around the high
voltage transformer.6_12_2012_3_42_22_pm.jpg

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1 Answer

How to fix fix my Hitachi Projection TV - model # 61WX01W, got darker and darker and now all dark. Has 3 pictures tubes. How do I fix the problem?

Likely what you have is the three tubes each have a filament--not unlike a light bulb-----someone would have to trace the filament voltage (usually comes from power supply) from source to the three tubes---filament connects to each tube with two connections and is usually 6.3 volts.

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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.

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2 Answers

There's no picture when the unit is turned on. Everything else seems to be working fine, which leads me to believe its a bulb or lamp issue. Where can I find replacements?

You probably have no high voltage as this model has no lamps in it. It has 3 CRT's which require 30 KV to light up. I suggest having a technician look at the TV for you as 30KV is nothing to play around with.

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The tv comes on but the picture tube has gone bad. at first if i warmed the tv up it eventually came on. the all at once the tube went out completely. i need to find a repair place where i can find an buy...

check tv screen on three colour RED /BLUE /GREEN is prasant but light or contrace is low .
if yes
first option is video output voltage 180v dc.canacting capaciter Replace with 10uf/250v dc
second option filament voltage 4.5v ac to up 6.5 v ac
and see pictur qulaty is improw .
theerd option is pictur tube charging 3 cathod

after change tube
see tube find this addrees
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1 Answer

RCA 32" TV - Model #32F531T - Faded to black

Isolate filament voltage from CRT,i.e. unplug Crt socket from pix tube.Measure filament voltage on CRT PCB.If present,suspect bad pix tube.If missing,solder any/all connects in filament circuit,meaning CRT board first then main PCB.

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