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Plic abut crt tv color blinking

5tyems blinking no disply dc voltag it is ok how can fix

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  • Televison & ... Master
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Can you please give brand and model and a description of what set is doing or not doing?

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

SOURCE: my tv sound ok, crt high voltage ok,channel number display ok

check for a resistor rated around 220kohms somewhere around the flyback area. i have never worked on this model tv before so i cant give you an exact part number on the board but had the same problem with sharp tvs

Posted on Nov 21, 2008

yammy_alf
  • 666 Answers

SOURCE: screen grid voltage on crt

voltage range from that pin is 300 to 350 v. dc. 

Posted on Apr 03, 2010

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voltage range from that pin is 300 to 350 v. dc. 

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Ur high voltage is dead,FBT,flyback transformer is dead,the big black block of plastice with a red wire with a cap hook to a CRT(tv tube).Resoder for lost green color,by the crt yoke RED GREEN YELLOW connection to the main PCB board.Might also have to resolder crt board connection pins socket.

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This sounds like a power supply problem, visually check the fuses and if they look ok, and you have a backgroud in electronics test to see if the set is prducing Dc voltage, you will need a multimeter and a schematic to do this with. However, if you do not have a background in electronics please take the set to a qualifide TV repair shop to have the repairs done.

I hope this helps.

Thank you,
Shuttle83

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1 Answer

Blurry Images


Hello paulaspec,

You have a problem with the three factors, and they are screen voltage, focus voltage, and control (focus 2) voltage. Basically these voltages have to be adjusted since the components in this section have aged some. These controls are usually located in the television on the IHVT (Integrated High Voltage Transformer) or as it is also called the flyback transformer. these controls must be adjusted together, along with the color controls. Here is how the adjustment is done (You will need a schematic diagram, a DC volt meter, and a color bar generator to do these measurments):

 

1) turn color and tint fully counter clockwise until you have a black and white picture.

 

2) connect the color bar generator to the TV (ch 3) and turn it on, you should see bars in various shades of gray

 

3) adjust as best as possible the color and tint controls to obtain the color bars on the screen Red Green Blue.

 

4) measure the voltages on the focus, screen and control grids of the CRT and match them to the schematic digram measurements.

 

5) adjust the focus screen and control grids to match the ones on the schematic diagram

 

6) once this is done then you adjust the color controls once again to obtain the red green and blue bars on the TV screen.

 

This should help if the CRT (picture tube) electron guns are still good and if the flyback transformer voltage supply is working.

 

However if you do not have a background in electronics please take the TV to a shop for repairs.

 

I hope this helps,

Thank you,

Shuttle83

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1 Answer

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Most of the time TV problems arise by power supply noise. This noise in the supply is usually caused by Electrolytic Capacitor failure. If you are technical, you can get the schematic and look for the voltage regulator circuits. Measure the voltages with a DVM using both the DC and AC settings. If the DC setting is lower than normal, you will probably see about .5 to 1v of AC voltage on the line. Look for the large capacitor in the regulator circuit and replace them. Cost about  $.50 each. Get new caps with slightly higher voltage rating (if they will physically fit).

Good Luck

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