Question about RCA 20F512T 20" TV

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Power on the standby led is on but don't turn on

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The problem is with the power circuit board components . The capacitors have gone bad. A pop sound is created due to the burn out of the capacitors..Faulty capacitors can be identified either by using an continuity tester or by appearance that i will be bulged at the top...

Most probably the burned out part which created the pop sound must have created a burned appearance in that area. Just check it out...

If you are an novice in working with the circuit board please take it to a technician who will be able to desolder the components and solder it again..

Posted on Feb 05, 2010

Testimonial: "found bad cap, not phisical pop up evidance."

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My Sony Bravia HX8/46 will not turn on, I check all the power going to it and it all works. Is there something I can do?


Is the standby led on the front lit. If not likely the problem is with power supply. If the standby led is on does it go off when the power button is pressed? Does the led blink. If so count the blinks and get back. The power supply provides an standby voltage to the main board. If the standby led is lit then this voltage is present. When the power button is pressed the micro sends a turn on voltage to the power board. Normally the power supply will respond and all other voltages needed to operate the set will come up. if a component is shorted the micro will not turn on the power board and will usually give a failure code via the standby led.

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1 Answer

Plasma will not turn on,no led light


I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.5_31_2012_5_17_56_pm.jpg5_31_2012_5_18_38_pm.jpg

May 30, 2012 | Televison & Video

1 Answer

When I turn the set off with the remote the blue led light goes out Does this mean the power is actually off or is the set still on standby If so do I really need to buy a 40 pounds power management...


Every TV set are going to standby if you shut it down and it is ready to start again (inside power work on minimum for starting electronic). It don't need some additive power management kit to work. But I would like to have some protection on power line cable for storm solutions.

Aug 25, 2011 | Samsung B2430HD LCD TV

1 Answer

When pluged in the On/Standby LED will light. When pressing power the On/Standby LED with flash then go solid but nothing apears on the display. I can select what speakrs to use (A or B). All the LED's...


Most likely the unit does not receive power from main transformer. Possible several reasons:
- bad power transformer
- bad main internal fuse 7-8amp. Bad fuse most likely because of one of the channel is blown and shorts the power, so before installing new fuse good idea to check all channels by meter or at least visually for burned parts
- bad power relay
- bad connection, cracked soldering joints

Jul 18, 2011 | Denon AVR-1602 Receiver

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I have a Sony KDS-R50XBR1 that has no picture. When I turn on the TV, the green Power/Standby LED light blinks for about 30 seconds, then turns red and blinks five times. The Power/Standby LED repeats...


  • Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen A2 slightly.

Jan 19, 2011 | Sony KDSR50XBR1 50" Projection HDTV

1 Answer

Hello. My Nec LT35 projector will not turn on. From standby mode, I hit the power button, the power LED turns green, the fan starts, but after two seconds it switches back to standby. The...


i have the exact same error with same projector. did you manage to solve this?

my status led blinked red 6 times indicating a "lamp error" which wasn't helpful. i also tried removing and replacing lamp but didn't work.

Dec 01, 2010 | NEC LT35 Multimedia Projector

1 Answer

What does it mean when that blinking green light turns to orange one in lp 350?


Hi
This would be "Standby"
When you press standby, the display and audio turn off and a blank screen is displayed for 15 minutes.
You can change the amount of time the projector stays in standby mode; see “Standby Time” on page 27 for details.
The LED lights orange while the projector is in standby.
• If you press standby again within 15 minutes, the projector returns to normal operations immediately. The LED changes from orange to green.
• If you press standby again after 15 minutes, there is about a 60 second delay before the lamp turns back on. The LED flashes green while the lamp is re-lighting.
• If you don’t press standby again, the lamp turns off after 15 minutes. The LED lights orange while the projector is in standby.
The full manual can be found here:
Infocus customer support
Infocus LP350 Manual
I hope these help
Mike

Sep 18, 2009 | InFocus LP350 Multimedia Projector

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