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My tv screen remains blank even when I switch the tv on, there's no sound tht indicates that the tv is switching on, the power supply circuit is ok but it seems as if the other circuits aren't getting power, what can check guys?

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  • 36 Answers

There are one or more fuses inside a CRT TV which probably failed. Check those first. Make sure the connections between the control board are tight. The only other area that causes problems is sometimes the CRT tube itself. It may be difficult to find a repair technician for the older TVs.

Posted on Nov 17, 2014

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6ya6ya
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Posted on Jan 02, 2017

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techman
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SOURCE: tv will not power up

no reset button ,sorry. The problem you describe is pretty common with this model as its a fault in the horizontal drive circuit or in the main power supply and without the proper service manual as well as the prober tools and equipment this set its not gonna get fixed. there are no panels or user changable boards as it is a solid state set. ptscorp.com could repair this board or exchange it with a referbished board but it would still requir some adjustment that a user may not be able to handle. time to call the pro.. Sorry couldnet help ya more.. Good Luck.

Posted on May 24, 2006

techman
  • 3130 Answers

SOURCE: Tv out of Focus

Well you did start out good, thats cool, now we have to define focus, Is ir blurry around the edges as well as the whole Picture? If it is, it could be the picture tube, A bad solder connection on the tube socket, and yes it could also be the flyback transformer.

Posted on Oct 06, 2006

premtech
  • 934 Answers

SOURCE: 32HFX71 Blinking Pwr Indicator Light

Not likely convergence because it's simply a direct view TV. Could be vertical, a common problem with that unit is the vertical output IC Q301 and poor solder connections of the link off R305. This could be enough to put the unit in shutdown. And it could also be SMPS, possibly regulator or horizontal output transistor - you would need to test these to be sure. The HOT, if shorted, will have continuity E to B or E to C.. If you're not sure you're up to this take it to a reputable shop. What I've described above isn't too serious and a good shop can having back to running good as new in a couple of hours. One tip I might add, take to the shop yourself it will save a few bucks. Good Luck Bill

Posted on Jun 14, 2007

  • 2 Answers

SOURCE: No picture, no sound, no lights, faint clicking sound, fuse ok

HT transistor, or rectfying diode from chopper transformer is blown.

Posted on Apr 24, 2009

localwonder
  • 6784 Answers

SOURCE: TV cant be switch on, RED LED diagnostic Blinks .. 3 times... then 4 times. Please advise probable cause and send sTV hcematic diagram.

Hi, this is main board failure and you will need to replace this vital board. you power board is fine but, it is unable to send a proper current through the main mother board due to the damage at hand.

Posted on May 21, 2009

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I have Sony Bravia KLV- 40V300A. After Switching power button, TV doesn't switched on & neither power nor stand by light is on.


Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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1 Answer

Blank TV screen after switch on


Hi.

The most common problem for this fault is the invertor failed.
The invertor is a HT circuit with 2,4,6,8, transformers on one or more of the tranformers will be open circuit.
Its relatively easy to replace but could be dificult & expensive to buy.

Chris..

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1 Answer

Tv has just a blank black screen no sound or picture - any ideas?


In fact, there is no power coming in to your TV. Check whether the main On-Off switch at your TV is ON or not. If it is ON; and still it is dead; the main power supply regulator board inside it is damaged.
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Merry X'Mas and Happy New Year; Jane.

Dec 10, 2014 | Panasonic Televison & Video

1 Answer

26la30q wont turn on


Hi
You have to start checkin from its main ON/OFF switch itself. If the switch have any contact contact trouble, the set will not turn On, even though you hear the click sound from the switch. If switch is Ok, then you have to come to the power supply regulator board. It can be easly recogonized the powe supply regulator boad. The main supply line will go straight to it. There will be more that 5 or mor secondary voltages from it, according to Tv model. These secondary wupplies will energzed only after the power supply switching circuit work properly.
Ther is a fuse [ a cartridge type; replaceable]. Check the fuse first. If it has blown; be carefull when you replace it; because there must be some reason for the blowing of that fuse. It is really a protection device. Before replacing it, you have to check the entire power supply board for some short circuit. If you have sound knoledge in repairing Switched Mode Power Supply [SMPS]; just proceed. Otherwise get it repaired by any experienced service technican or by authorised service center for Proscan. OK.

Jul 08, 2011 | Proscan 26LA30Q 26 in. LCD Television

1 Answer

Its a un branded 20.9'' flat screen TV 3/4 years old. When switching on it may work for 1 hour or more or 3 minutes or not at all. Sound is OK just no picture although pressing controls on TV set sometimes...


most trouble like that shows a protect mode, there's a problem with the system and it shuts down,if the sound remain after the screen off, the back lights circuit is only in trouble.whole system shutdown.tell me

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1 Answer

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You have problem with the power inverter, in you tv it might be part of the power supply, in which case you will need just one board. Julio milleniumtvsvc@gmail.com

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Rca L32hd31 lcd no picture blank screen.


Your mainboard is damaged, replace it and that will solve your issue.

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You have no high voltage, like many in this forum, this model of Philips has some of the same problems. Look around here you may find the answer to your set. If not check Vertical IC, TDA8177, audio ic on signal board up front on left. check Power supply first for blown fuse, 1000, 2004, 1300, 1900 etc. No sound or pic means something is open. Does set has L E D lights on front of set?

Sep 02, 2007 | Philips 60PP9202 60" Rear Projection...

1 Answer

No pic/sound


If you dont here anything then it sounds like the switching power supply or the horizontal output circuits not starting up. this requires troubleshooting with a variac, as well as maybe a scope. If your not trained to work on HI Voltage circuits you should seek assistance with this repair. Theres HI voltage inside these sets even after they are unplugged for a while. sorry i couldnt be of more assistance.

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