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TV does not turn on, but power light blinks green on and off. We have all replacement circuit boards, but are still unable to fix it.

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  • rwheeler61 Oct 10, 2010

    The model is hp lc3760n, so please provide specific if you can.

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You haven't told us the exact model of your tv so i can't be very precise.
On older tv's the blink signals that the power source is in protected mode because there's a short on one of its output lines - use a voltmeter to find out which output line is down then test all components / boards that this line powers until you find the shorted one.
On newer tv's that blinking signals the fact that the processor of the tv has been unable to load the firmware - something is wrong in the mainboard of the tv. Again you must test it - if the voltages at the processor are ok then the defect is in it. In that case you must replace the mainboard.

Posted on Oct 10, 2010

  • Azrael SRL Oct 10, 2010

    This is an older model, in which have been used low quality components - it has been so bad that HP went out of the tv business a year after it. The electrolytic capacitors are especially infamous - if you decide to keep it you will gonna have to replace all of them, and they are over 50 in the entire tv.
    Start testing the power source first; once you fix it be sure you are going to find another failures on the inverter board and the t-con board so fix them also.
    In the end test the mainboard, there's a good chance that the processor has been fried by the failing power source.

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SOURCE: How do I access the circuit board on the Apex LD1919?

All the components are screwed to the back of the cabinet. Once the back screws are removed, the front bezel snaps off. (Not easily, but take courage and try.) Release a connector in a set of leads to the pilot light panel to get enough slack to lay the bezel flat. The LCD panel then removes with seven silver screws (one is a ground lead). Move it to the side, and the power supply board is accessible. Two connectors and four screws, and it comes out.

Posted on Jul 13, 2009

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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.

Dec 30, 2014 | Sony Televison & Video

1 Answer

I have a 42PFP5332 which doesn't turn on. When plugging in the power the green led on the power circuit board turn for a few seconds and then blinks for 9 times. After that it blinks for 10 times


Good day!!!


That problem is usually cause of faulty capacitors on the power supply board..

Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

Jun 18, 2012 | Philips 42PFP5332D 42 in. Plasma...

1 Answer

Green power light keeps blinking


hi friend,
Repairing It Yourself
If you decide to repair the TV yourself, I recommend that you obtain a copy of the repair manual for your Mitsubishi TV from the Techlore website by going to Mitsubishi Service Manual. It will provide some direction, however it is technically written and may be difficult for the NOVICE to understand. If you are unable to locate the the service manual for your specific Model at the above Techlore link, you may need to purchase the service manual online at ServiceManuals.net.
If you decide to have a service technician do the repair, insist that the "DM" module is removed from the TV and ONLY the four 1000uF, 16V Capacitors (Caps) located on the DM Module are replaced. MOST techincians will INSIST on replacing the entire DM Module and not simply the capacitors. The cost is about $200 for a technician to replace the capacitors and $1000 for replacement of the DM Module. As you will read below, doing the repair yourself will cost less than $4.00 for the 4 Caps.
A Few "Cautions"
  1. Keep yourself "grounded" when working with the circuit board. Static electricity will destroy electronic components.
  2. When replacing the Capacitors, press them "down" onto the circuit board as far as they will go, hold them down, solder into place and clip the excess terminal lengths flush with solder. Only by doing this will the metal shield (little silver box) slide down and over the circuit board during re-assembly. There is not a lot of clearance when doing this, as the 105C Capacitors are slightly longer that the originals. With minimal effort everything does fit back together.
  3. Use ONLY 105º C capacitors with a voltage rating of 35 V.
  4. Re-insert the DM circuit board into the Mother board; press virmly and ensure a proper seat of the DM board. Next, slide the metal case down and over the DM circuit board. Refer to my "Lesson Learned."
Basic Troubleshooting
  1. Press the "reset" button and hold for 10 seconds .... Does TV turn on and blinking green light turn to solid green.
  2. Unplug the TV from it's power source for various times, ranging between 5 minutes and 24 hours..... Does blinking green light continue upon plugging in the TV.
  3. Disconnect ALL devices from the TV; DVD, Tuner, Cable Box, unplug the TV for various duration times .... Does blinking green light continues upon plugging in the TV.
  4. Press Power and Menu buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.
  5. Press Power and Display buttons simultaneously and hold depressed for 20 seconds .... Does blinking green light continue to flash.
  6. Insure that no front panel buttons are inadvertently stuck in an "engaged" position.
Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:
  1. DM Module Capacitors have FAILED.
  2. DM Module is defective.
  3. EEPROM Board failure
  4. Power Supply failure.
hope this helps u
please rate me.....................
thank u for using fixya
regards
sivaranjini

Nov 24, 2009 | Insignia IS-LCDTV32 32 in. Television

1 Answer

TV will not turn on


Ok, you stated that you get a green for a second and then a couple of blinks and then, it turns off. This rules out the power board but, its main control partner is experiencing some trauma. Normally in the plasma TV set, the green is a go but, if the PCB(Power control board), doesn't agree, the the power board will shutdown the entire unit after giving a few blinks. Its very important to remember that, the power board and the power control board are two separate circuit boards. In your case, the PCB is down and it will need to be replaced.

Please rate and god bless.

Mar 27, 2009 | LG 50PC1DRA 50 in. Plasma Television

1 Answer

Mitsubishi hdtv1080 won't turn on. green timer light flashing


could be a lot of things really. when you replace the bulb, there is a switch that will prevent the tv from turning on if the cover isn't sitting correctly, by moving it that might have shifted so it would blink, but not turn on. if not, well get it serviced, sorry

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1 Answer

Flashing green light


This is a very serious problem. The green blinking LED means the TV is reading its software but it can't complete the task. The cause is the premature failure of dozens of capacitors on several circuit boards in the TV. To properly fix this, the chassis needs to sent to Mitsubishi for rebuilding. You'll need to contact a Mitsubishi authorized service center to do this. This is expensive and takes quite a bit of time.

michtech

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1 Answer

Mitsubishi wd-62825 dlp


If the green front panel LED blinks continuously and the TV never comes on, its an issue with the "DM" board. When these TVs are first plugged in, the green LED should blink for 30 sec. to a minute or so. This is the TV booting up, reading its software. Mitsubishi has been having problems with this circuit for several years. In may cases the only permanent solution is to have the chassis rebuilt by Mitsubishi at considerable cost and inconvience. The chassis may have to be sent back to Mits for this rebuild. Call Mits and ask for help.

michtech

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1 Answer

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don't like being turned on and off a lot

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3 Answers

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