Question about Hitachi 50SBX78B 50" Rear Projection Television

2 Answers

My tv will not power up?

My power went off too. If I unplug the unit then plug it back in I see green lights on the circuit boards for about 15 seconds and the power light is on in front then it all goes off again.

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  • asutropper May 13, 2008

    Same happens to my TV. I unplug, then plug back in. The LEDs on the circuit board light up for a few seconds then everything turns off.

  • drfeelgoodno Jul 08, 2008

    when replugged led in front comes on after 3-4 seconds for coupla seconds then shuts down

  • Anonymous Aug 25, 2008

    same thing

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2 Answers

Edward
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If you have Hitachi model number 50UX58B, 60UX58B, 50UX58K, 60UX58K, 50SBX78B or 60SBX78B and you have the following symptoms you may want to grab a repair kit from www.TvRepairKits.com. They have put together a kit that includes the parts and instructions to fix these models. This is a fairly common problem with the above model numbers. It is typically caused by a blown capacitor and pico fuse. Again, you can get a kit from the above address. 

Here are the symptoms...

Primary Symptom: No Audio or Video. Power light will come on briefly then shut off.
Other Possible Symptoms : The green LEDs on the circuit board light up for a few seconds then turn off.

Hope this helps,


Posted on Nov 02, 2008

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  • Expert
  • 96 Answers

Well it could lot's of problem, first I would suspect bad convergence it's, you will have to insulate what circuit is shutting the unit down, could be over current, over voltage, difflection, convergence, bad power supply, no power (fuse), cold solder joint, when there is no difflection the system (CPU) will turn off the unit to proteck the crt's.
I would first start by syspecting the convergence section shutting down the unit.

Regards

What About Bob

Posted on Mar 15, 2008

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1 Answer

Klv32s310A sony bravia gets start on with green light and after a second turns to stand by mode blinking the red light 6 times after each 2 second interval
Hello Sagar,
green led means tv powered on and status ok.
Red blinking light almost always means defect, overcurrent or overload.
6 blinks for Sony lcd flat tv means trouble in backlight circuit, or backlight inverter (backlight illumination or lighting makes your tv screen visible).
common problems in the inverter circuit, which drives the backlight, or shorted drivers, or short-circuit transformers or open circuits.
You should find the problem in the inverter circuit, or in the power supply board or in the main board.
Also look for bad capacitors (electrolytic caps) which are bulged and swollen on top.
Decoupling plugs from printed circuit boards can help you in finding the problem board by elimination method.
If you power up the set after unplugging certain plugs on f.e. the inverter board , this could result in getting a green power led and concluding that this board is faulty.

succes,
Walter from Antwerp, Belgium.

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Tip

How to fix Sharp LCD model # LC-32SB23U flashing green power light and check and...
If the green power light keeps flashing on and off every second and tv will not power on unplug the tv for 5 minutes, then try this. Keep holding the VOL+ and CH- buttons down while you plug the tv cord back into the wall ac outlet till you get sound and picture for a second or two. You should be able to turn the tv on and off with the power button now. Next turn the power button off and unplug the tv for a few seconds and then plug it back in and turn the power button back on. Watch the screen and see if the sound and picture comes on, best to check in a dark room to see better, if sound stays on and picture comes on a few seconds and back off you have a bad CCFL backlight lamp in the LCD panel. This tv hads (10) CCFL lamps part # RLMPLA029WJN1 cost $15.93 at www.partstore.com or $19.49 at www.encompassparts.com in it and if one is burned out it will not let the tv picture be powered on till it is replaced. To check and replace the CCFL lamp you will have to unplug the ac cord from the tv back and remove 10 screws holding the back on. With back removed unplug the wire plug on the power button circuit at top left side of the black LCD screen trim, remove 4 screws holding the top of black trim, lay speakers off it, and release trim clips, (4) at top and (2) at bottom with a flat screw driver, and lower the trim to unclip the LED circuit board at bottom left side on the trim, leave the wiring pluged into this LED circuit board . With trim removed, at top of LCD panel remove the (2) PC ribbon wire clips with thumb nail by lifting up on it to release the flat PC ribbon wire. Lay the tv back on a soft pillow with screen up, and look on the LCD panel front for and remove the (10) silver screws 1/2" long with an arrow mark beside them. Do not remove any gold colored screws or any without marks. The LCD panel screen can now be lifted off, lift the backlight plastic thin sheeting and thick sheet off to see the CCFL lamps. Stand tv up and plug the ac cord back into the power supply inverter circuit board and plug the power button plug wire back in its circuit board on the LCD black trim panel, and power the tv on while looking at the CCFL lamps. If the lamp is dim or burned out, take the (2) white plastic covers off the side ends of the lamps with a flat screw driver and unclip the lamp to replace it, Check the bad lamp sockets, part # QSOCFA003WJZZ, by putting a good lamp in it and if it lights up the sockets are good and the bad lamp was the problem. If all the CCFL lamps do not light up, unclip the top lamps and move them to differant sockets to the center and the center lamps to the top, if the lamps do not light up, then it is a bad power supply inverter circuit board the ac cord plugs into, part # RUNTKA448WJQZ , cost about $160.00 for new one or less if you buy a used one on www.ebay.com , replace it. If the power supply inverter circuit board is bad to replace it, unplug the (2) wire plugs at the top left side on the circuit board, take (3) screws marked with an arrow out, use a pair of sharp nose plyers and squeeze the plastic white tip holding the circuit board on the right side careful not to touch the high power circuit backlight plugs on the right side of the circuit board. Pull board straight out to unplug it. Replace with new board and tv should power on now.
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1 Answer

Tv stays on for 15-20 minutes and then picture blacks out, Can't turn back on. Unplug and plaug in again but still only last 15 - 20 minutes. new lamp, no difference.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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The power went off at my house due to an overload and when the breaker was turned back on, the tv had no power, no green or orange light. I unplugged the power cord and plugged it in later and the tv...
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On my kenmore central vac no power unplug unit plug it back green light comes on but try turning vac on green light goes off again .
Please clarify that we are talking about the central vac LED/switch panel panel and plugging it into a 110 V wall receptacle.
If I understand when you unplug from the power source ,then plug back in the green LED comes on, looking normal ? But when you manually activate the switch on the motor housing of the vac itself the vac does not start and the LED goes out, so no green or red LED at that point?
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