Question about SAMTRON 55V 15" CRT Monitor

# Please tell me what is flyback 1600V working voltage PF (near the horizontal transistor)

Posted by on

• Level 1:

An expert who has achieved level 1.

Corporal:

An expert that has over 10 points.

Mayor:

An expert whose answer got voted for 2 times.

Problem Solver:

An expert who has answered 5 questions.

• Contributor

Hi

Flyback is a step-up transformer multifly the voltage depends on the size of the tube and supplied high voltage to cathode ray tube.The minimum output voltage of this is 14000v DC for 14 inches crt monitor what if your crt is 17 inches 17000v DC very dangerous if you are not electronics repairman.

Posted on Aug 21, 2009

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

×

my-video-file.mp4

×

## Related Questions:

### Equivalence transistor tt2206

Equivalent Sanyo 2S?5793
Features : I(c) : 10A, V(cbo) : 1600V
1. High speed.
2. High breakdown voltage (Vcbo=1600V, Vceo=800V, Ic=10A, Pc=65W ).
3. High reliability (Adoption of HVP process).

### TT2206 equivalent circuit is 2S?5793, TT2202, JL6920, 2SC5446

Dec 19, 2016 | Televison & Video

Tip

### How to test Flyback Transformer Without taking it off the Boarda) Basically it...

How to test Flyback Transformer Without taking it off the Board

a) Basically it has to be acted upon by a supply voltage of at least 95V

to work.

sample picture:

b) Of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive and horizontal output transistor

sample of H out transistor

It would generate output voltages on the secondary terminals

and 200V line will be active sending voltages to the

Video Drive circuits. Of course high voltage will be generated

ranging to at least 30 KV and there will be voltages on the G2 of the CRT.

c) The easiest test point to look when it is oscillating, is the CRT heater

voltage, the heater lit when flyback is good ( mostly at night times when it

is dark ) and you can hear sounds, too ( if speaker is connected).

• Heater : marked with letter H and H1

• Green Arrow for the G2 voltage

d) Having a B+ voltage reading of 75 V or lesser ( primary pins )

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.

• These only applies to CRT type TV's.

on Jul 31, 2012 | Philips Televison & Video

Tip

### How to test flyback without taking it out of the board

a) basically it has to be acted upon by a supply voltage of at least 95V

to work.

b) of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive it should generate output voltages on the

secondary terminals

c) the easiest test point to look when it is oscillating is the CRT heater

voltage, the heater lit when flyback is good.

d) having a voltage reading of 75 V or lesser on its primary pins

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.

These only applies to CRT type TV's.

on Dec 03, 2009 | Televison & Video

### We replaced the transformer for our RCA F27650. It was sparking and now it is not, but now the screen won't turn on. It is just black. We hookd all the wires up like they were. we can hear sound, but...

Hello
Along with the flyback transofrmer, its horizontal output transistor also must be replaced. I don't know whether you have replaced it or not. If not, replace it too. It can be located very near to the flyback transformer, a three terminal component, black in colour, usually screwed to a metal heatsink. Then switch on the TV and measure the video output voltage at the video output card pluged directly to the picture tube neck. The collector of the video aoutput transistors must come around 145VDC. If it also is there, advance the screen control on the flyback transformer to get a raster. If that voltage is not there, it means that the flyback transformer is not working, and horizontal oscillator stage should be checked for oscillation, check the lined drive transformer for its primary winding open, Check the entire horizontal oscillator section. The collector point of the line drive transistor, the transistor that drives the line drive transformer, a small transformer soldered diretly to the printed circuit board; should be checked with frequency meter. The frequency at that point should come around 15525HZ approx: OK.

Mar 19, 2011 | RCA F27650 27" TV

### Tv not switching on just makin noise from power supply & hissing @ the flyback transformer with horizontal becoming extremly hot then afew min later horizontal burns out(D1398)

If the horizontal transistor getting shorted, this could happen.
Check the transistor 2 SD1398. If found faulty replace it.
But replace black colored doides in the circuit as a whole.
Leaky diodes can not be determined easily with the multi meter.
Especialy the small high voltage diode near the small transformer
connected to the 2 SD1368 transistor.

Sep 03, 2010 | Televison & Video

### Not getting full screen on an acer aspire one

please change the capacitor 1600v 4.4nF near the horizontal output transistor and put the value 2000v 6.8nF

Mar 18, 2009 | SAMTRON 55V 15" CRT Monitor

### Horizontal width problem

1. change the flyback 1600v working voltage pf.(near to Horizontel transistor.)

Dec 10, 2008 | SAMTRON 55V 15" CRT Monitor

checked the horizontal output,a big transistor near the flyback trnsformer, if it is shorted replace it,,,,

Feb 13, 2008 | Sampo AlphaScan 411 Monitor

### Tv problem

The F27442 uses the CTC203 series chassis and that symptom is very common. If the horizontal output is shorted you MUST resolder the coil in series with the base of that transistor and the pins of the small horizontal drive transformer. When they have been properly resoldered you can put in a new original horizontal output transistor. If the output transistor shorts out again then your flyback (high voltage) transformer is shorted and needs to be replaced.

Aug 08, 2007 | RCA F27442 27" TV

### Horizontal output transistor keeps failing

The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.

May 15, 2007 | ViewSonic E70f 17" CRT Monitor

## Open Questions:

#### Related Topics:

107 people viewed this question

Level 1 Expert

Level 3 Expert

Level 3 Expert