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EHT or Extra High Tension is the power supplied to the final anode of the cathode ray tube.
The EHT is traditionally generated by the line transformer from the flyback pulse of the line oscillator/amplifier.
The generated high frequency high voltage current was from the outset rectified by a thermionic diode (eg. EY51, EY86) but by the late 1960s/early 1970s technology brought high voltage diodes and semiconductors rapidly replaced the old technology and the output from the line transformer then typically fed the anode via a semiconductor voltage doubler.
The rectified EHT was originally smoothed by a high voltage oil-filled capacitor but that was soon deleted in favour of spraying the outside of the CRT with a metallic paint and grounding it. This became the high voltage smoothing capacitor with the glass of the CRT being the dielectric and the final anode the positive pole...
it is sparking as the case has come cracked. I have manager to fix some with some superglue finding the crack takes a few times to fill the gap. failing that a glue gun around it will put a rubber seal around it and make it safe. .
IF LED IS BLINKING then following is the situation.............. usually after 4 or 5 yrs EHT ( transformer that supplies voltage to tube ) becomes weak - then TV won't get ON.. means no picture no sound but LED blinks - in some TVs along with EHT 1 or 2 components like resistor, transistors, etc will also gets deffective - so solution is TV circuit board has to be checked to find whether only EHT is deffective or other components are also deffective - price of EHT will be between Rs.250 (US$ 5) to Rs.600 (US$ 12) - iam service engineer (computers, laptops, printers,etc) - bangalore - domlur - 09986222774 - [email protected] - if you are in bangalore then you can call me for service - i think you are living somewhere in america /australia..... - problem is simple but i don't have any idea about EHT COMPONENT 's price & service charge in your place.......IF LED IS ALSO NOT BLINKING then following is the situation............fuse is gone due to deffective component in power section ....BOARD HAS TO BE CHECKED..............so my suggestion contact near by TV service engineer or approach RCA service centre ....this problem cannot be solved by user unless user is a technical person, having idea about components (resisitors,transistors, diodes, ...etc), having tools like multimeter ,soldering iron , soldering lead ,flux, desoldering coil, etc....
IF LED IS BLINKING then following is the situation.............. usually after 4 or 5 yrs EHT ( transformer that supplies voltage to tube ) becomes weak - then TV won't get ON.. means no picture no sound but LED blinks - in some TVs along with EHT 1 or 2 components like resistor, transistors, etc will also gets deffective - so solution is TV circuit board has to be checked to find whether only EHT is deffective or other components are also deffective - price of EHT will be between Rs.250 (US$ 5) to Rs.600 (US$ 12) - iam service engineer (computers, laptops, printers,etc) - bangalore - domlur - 09986222774 - [email protected] - if you are in bangalore then you can call me for service - i think you are living somewhere in america /australia..... - problem is simple but i don't have any idea about EHT COMPONENT 's price & service charge in your place.......IF LED IS ALSO NOT BLINKING then following is the situation............fuse is gone due to deffective component in power section ..................so my suggestion contact near by TV service engineer or approach SANYO service centre ....this problem cannot be solved by user unless user is a technical person, having idea about components (resisitors,transistors, diodes, ...etc), having tools like multimeter ,soldering iron , soldering lead ,flux, desoldering coil, etc....
1st POSSIBILITY - usually after 4 or 5 yrs EHT ( transformer that supplies voltage to tube ) becomes weak - then TV won't get ON.. means no picture no sound ( in some TVs ''garrrr'' like sound comes - but it is rare) ..... but LED blinks - in some TVs along with EHT 1 or 2 components like resistor, transistors, etc will also gets deffective
2nd POSSIBILITY - main capacitor (very big in size) is blowing off i think in your case main capacitor is blown - so solution is TV circuit board has to be checked to find whether only EHT is deffective or other components are also deffective - price of EHT will be between Rs.250 (US$ 5) to Rs.600 (US$ 12) & price of capacitor will be between Rs.50 (US$1 ) to Rs.150 (US$3)
- iam service engineer (computers, laptops, printers,etc) - bangalore - domlur - 09986222774 - [email protected] - if you are in bangalore then you can call me for service I think you are in america/australia...side ----------- i don't have any idea about EHT transformer's price & service charge in your place..............
On my Akai LCT2715---- Ok, I had the same problem with locating USER MODE (even called Akai service HELP and that person didn't know anything)!!! even tho we looked through manual just got TV back from putting $184 in Capacitors repair (PUT IN NEW NICHICON CAPACITORS) from the standby button not woking just flashing from the Power Supply gone bad plus 2 main capacitors other than power supply that were bad. Works great now. For the USER MODE look on the remote in the bottom black area repeatedly push the P.MODE. You should have full function to adjust all in menu list WE DID.
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