Question about Thomson 28VK25US TV

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No picture Initially eht is up then set shuts down .MODEL 25DG17UG

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Hi.

Look on the rear of tv set to see if there is a chassis number it normally starts ICC


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Chris

Posted on Nov 07, 2007

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Why is my sumsung tv model CS21B501HL take too long to show pictures when switch on?


after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - TV TUBE ) becomes weak - then 1 of the indication is that it takes few seconds time for picture to appear ( after few days it takes few hrs & then stops completely).............. .......so solution is EHT ( also called as flyback transformer ) should be replaced....... {{ few details about EHT---- its size will be around 3inch X 2inch X 2inch ---it will have 2 or 3 knobs to adjust focus , brightness ------ at bottom around 10 pins will be there ------- from EHT 1 thick red colour cable goes to CRT TUBE --------- on EHT its part number will be there }} -------- so if user is a technical person having idea about components ( resistors, transistors, diodes, etc ) , having tools like multimeter ( to check components) , soldering iron, soldering lead, flux, desoldering wig ( for removing components), etc also little experience in servicing field( compulsory) ----------------- then user can remove EHT from main board ---- take to electronic shop ----- buy same type EHT --------- fix to mainboard ( knobs on EHT should be adjusted according to picture --- after switching TV --- this adjustment is very important ) ----------iam from bangalore ........since it is very risky job i suggest to contact TV service engineer ------- because they are highly experienced & can fix this component very easily. ------------ [[ sometimes along with EHT another component called transistor ( big in size - situated close to EHT - it will have 3pins - its size will be 1inch X 1/2 inch X 1/2 cm --approximately ---- black in colour ----- fixed to aluminium metal ) --- will also gets deffective --- so this component also should be checked ]] ---- in your case this transistor is good ... because when this component gets deffective then TV won't get '' ON '' .............so in your case only EHT should be replaced.........100% it works normally .....GUARANTEE....... vishnuswamy_4.jpg

Aug 02, 2011 | Samsung Televison & Video

1 Answer

Sony Trinitron XBR 36 in (TV control on Top Middle of set) (set-up / tv/video / vol / channel / power) when set is powered on the standby/stereo light Continuous blinks red once a second, no pausing -...


after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - TV TUBE ) becomes weak - then 1 of the indication is exactly as you have described .....after few seconds picture comes slowly & immediately (after few seconds). it gets off only red light blinks............ .......so solution is EHT ( also called as flyback transformer ) should be replaced....... {{ few details about EHT---- its size will be around 3inch X 2inch X 2inch ---it will have 2 or 3 knobs to adjust focus , brightness ------ at bottom around 10 pins will be there ------- from EHT 1 thick red colour cable goes to CRT TUBE --------- on EHT its part number will be there }} -------- so if user is a technical person having idea about components ( resistors, transistors, diodes, etc ) , having tools like multimeter ( to check components) , soldering iron, soldering lead, flux, desoldering wig ( for removing components), etc also little experience in servicing field( compulsory) ----------------- then user can remove EHT from main board ---- take to electronic shop ----- buy same type EHT --------- fix to mainboard ( knobs on EHT should be adjusted according to picture --- after switching TV --- this adjustment is very important ) ----------iam from bangalore ..since it is very risky job i suggest to contact TV service engineer ------- because they are highly experienced & can fix this component very easily. ------------ [[ sometimes along with EHT another component called transistor ( big in size - situated close to EHT - it will have 3pins - its size will be 1inch X 1/2 inch X 1/2 cm --approximately ---- black in colour ----- fixed to aluminium metal ) --- will also gets deffective --- so this component also should be checked ]] ---- in your case this transistor is good ... because when this component gets deffective then TV won't get '' ON '' .............so in your case only EHT should be replaced.........100% it works normally .....GUARANTEE....... vishnuswamy_4.jpg

Jul 24, 2011 | Sony FD Trinitron WEGA KV-36XBR800 36" TV

1 Answer

I have a Sony KV-35S26 manufactured Aug '97. The picture comes ON only occasionally. When it fails to come ON, the standby light blinks continuously. Sometimes, the picture comes ON initially then...


after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - TV TUBE ) becomes weak - then few TVs ( not all TVs ) behaves exactly as you have described.............. .......so solution is EHT ( also called as flyback transformer ) should be replaced....... {{ few details about EHT---- its size will be around 3inch X 2inch X 2inch ---it will have 2 or 3 knobs to adjust focus , brightness ------ at bottom around 10 pins will be there ------- from EHT 1 thick red colour cable goes to CRT TUBE --------- on EHT its part number will be there }} -------- so if user is a technical person having idea about components ( resistors, transistors, diodes, etc ) , having tools like multimeter ( to check components) , soldering iron, soldering lead, flux, desoldering wig ( for removing components), etc also little experience in servicing field( compulsory) ----------------- then user can remove EHT from main board ---- take to electronic shop ----- buy same type EHT --------- fix to mainboard ( knobs on EHT should be adjusted according to picture --- after switching TV --- this adjustment is very important ) ----------iam from bangalore (09986222774, sathyavijayasarathibabu@ymail.com) ----- here EHT's price will be around Rs 250 ( US $ 6 ) & for my customers (in bangalore) i will take another Rs 500 (US $ 11) as service charge......i don't have any idea about EHT ' s price & service charge in your place.........since it is very risky job i suggest to contact TV service engineer ------- because they are highly experienced & can fix this component very easily. ------------ [[ sometimes along with EHT another component called transistor ( big in size - situated close to EHT - it will have 3pins - its size will be 1inch X 1/2 inch X 1/2 cm --approximately ---- black in colour ----- fixed to aluminium metal ) --- will also gets deffective --- so this component also should be checked ]] ---- in your case this transistor is good ... because when this component gets deffective then TV won't get '' ON '' .............so in your case only EHT should be replaced.........100% it works normally ----- though it is 14yrs old itseems TV TUBE is still in good condition because you have said that whenever display comes picture is clear......so if EHT ( same type) is replaced then your TV will work atleast for 2 more years.....GUARANTEE.......

May 22, 2011 | Sony KV-35S26 35" TV

1 Answer

When I open my RCA TV 25648 it shut down after a few second. Is there any way to fix it ? Thanks


IF LED IS BLINKING then............. 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 ..........IF LED IS ALSO OFF then on main board in power section area some component is deffective ... MAIN BOARD SHOULD BE CHECKED COMPLETELY........ 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 from bangalore (09986222774, sathyavijayasarathibabu@ymail.com ) .....i don't have any idea about EHT component's price & service charge in your area........this problem cannot be solved by user unless user is a technical person having idea about components (resistors, transistors,diodes,...etc..), having multimeter , soldering iron & other tools...so my suggestion call TV service engineer or contact RCA service centre.........

Apr 21, 2011 | RCA F25648 25" TV

1 Answer

I have a sony model KV30HS420. The hv comes up for a second the the set shuts down with 6 blinks. Any ideas? thanks.


The Horizontal stage has stopped. It could be caused by excessive EHT and the set will shut down, the power supply is faulty or something more sinnister like an electrical leak on the output side of the EHT unit.

Feb 22, 2011 | Sony Televison & Video

2 Answers

Switches on then goes back to standby mode.initially it would show a the picture pressed vertically


problem on three things.
1.power supply: some of components may be damage,such as,EHT transformer ,Capacitor,diode Mos fat ,
2. Video card
3. If it self check thoroughly or not go to work shop.

Feb 12, 2010 | LG RU-27FB30C TV

1 Answer

Rca truflat tv goes blank after 30 minutes, then I can't get a


When this goes off is there a loud crack? If so perhaps the B+ supply is increasing increasing the the EHT to the CRT and the crack is the voltage across the spark gap in the crt base jumping to chassis/earth shutting down the TV. Or perhaps just a dusty/dirty eht cap, again EHT discharge, or could be a eht tripler being faulty. Further investigation with the aid of a service manual is required I am afraid.

Sep 12, 2009 | RCA 32F531T 32" TV

1 Answer

No picture on my Dell 790 monitor (17


Tom,
What you've got it a busted backlight inverter... need to replaced a new one or repaired it. To repaired, if you are lucky just replaced a couple of faulty capacitors in the power supply w/ built-in inverter... Good lucks, have nice day!

Oct 23, 2008 | Computers & Internet

1 Answer

Tv set won't start up


as your reg. output is 40v & you have checked every possible things responsible for it. my suggetion is that first you isolate power supply from hor.section & see if power supply output is ok. if it is ok then check for short & leakage in h/output like 1 hor.output tr. 2 diode or cap in eht winding. 3 check for print near eht transformer. 4 disconnect yoke connector & check . 5 & finally eht or flyback transformer.

Sep 29, 2007 | Philips Magnavox 27MS343S 27" TV

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