Question about Televison & Video

2 Answers

AKAI LCD2701 won't turn on

I have a AKAI LCD2701 tv that won't turn on.
The RED LED is lit on the front but I get no response from the remote or power buttons on the side.

I am a EE so I have done a little debug but need some help from someone who knows LCD TV circuits.

There are three boards behind the case. One is clearly the AC/DC power supply board, one seems to be the TV tuner card and one looks to be the master controller. I have +5.0 volts running to the master controller and to all the switches (probably why the RED LED works). The other labeled power outputs (+12v & +24v) from the power board are sitting at GND. I assume this is because the unit is in "standby" waiting for the controller board to signal a power on condition. There is a 27Mhz crystal that probably feeds whatever is under the adjacent heat sink (ASIC or FPGA) on the controller board and that seems to be running okay according to my scope when the AC switch (near the plug entrance) is on. My guess is that the controller for some reason is not enabling the power on condition. Here are a couple of my questions:

1) Any safety features I can look for that would keep the controller from turning on the power. I am thinking of thermal protection, under voltage conditions, etc.

2) There is a connector from the controller board to the power board that has SB+5.0, GND and SB. The first one is sitting at +5volts, the later two at GND. I was thinking of shorting the +5.0 to the SB with a 10k resistor to see if I could force the power supply on since my guess is that it is the power on signal. I am hesistant since I don't have a schematic and only guessing.

Thanks in advance.

Posted by on

  • 1 more comment 
  • WasabiSkier Nov 07, 2008

    It is solid red all the time when the unit has AC pwr (which I think is the normal state of the LED when the unit is in standby mode). I considered the bad power brd caps as a problem based on other posts but all of the previous posts mentioned a blinking red LED not a solid one. I have eyeballed the power brd and all the caps look fine. No bulging heads, no leaking fluid.



    If the power brd is supposed to put out +5,+12 and +24 any time it is plugged in, then it is definitely broken.



    If it uses a standby scheme where +5 is active but +12 and +24 are switched with a signal from the controller/signal board, then it may be working correctly.



  • WasabiSkier Nov 08, 2008

    My guess is that the signal board is bad but I would like a little more concrete evidence that it is bad. Can anyone explain / confirm my expectation for readings on the power board and signal board?



    Specifically, does the power board only put out the +5VSB until it receives some sort of signal from the signal board?



    What does the signal board power on signal consist of; Is it a pulse on a certain line or is it a +5 volt level on one of the lines?



    I generally like to prove the board is bad before I go buying entire replacement parts.



    I am not certain the power board is good because I don't know what outputs are supposed to be enabled at what time. I can only state the power board does not have any visually damaged caps.



    Can someone also provide a link to FOX INTERNATIONAL incase I want to price out the replacement signal board? I did a google search and ended up with all sorts of unrelated hits.

  • go go Mar 13, 2009

    i have an akai 24 and the blue panel thing wont turn on when i put the usb

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 453 Answers

Is the front led is red on all the time , if it's you may have a bad power bad capacitors , but if is not on u may have a bad signal board ,

Posted on Nov 07, 2008

  • Jose Garcia Nov 07, 2008

    so , if all ur cap are ok , u have a bad signal board there is only 1 place to get this board , fox international

  • Jose Garcia Nov 07, 2008

    there is only one place to get this signal board , FOX INTERNATIONAL ,

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Samsung UN55FH6003FXZA won't turn on even though the red LED on the front is lit showing power is available. It did have a long delay to turn on, now not at all.


Samsung TV won't turn on + blinking red light (explained fix ...

? 4:03
https://www.youtube.com/watch?v=wEWzYLaKdgU
Aug 29, 2014 - Uploaded by Mysimplefix
(CC) (HD) A step-by-step repair video, showing the replacement of swollen/shorted "electrolytic capacitors ...Missing: un55fh6003fxza
bout 1,270 results (0.53 seconds) Search ResultsSamsung LCD TV LN32A330 power won't turn on - Forums - CNETwww.cnet.com > Forums > SamsungCNETMy 1 1/2 year-old LCD TV model LN32A330 won't turn on by direct and remote today. The red stand-by light is lit, but never blinks and the TV won't power up. A..Samsung UN55FH6003FXZA BN94-06418R Main Board ...www.shopjimmy.com/samsung-un55fh6003fxza-bn94-0641...ShopJimmyThis Samsung UN55FH6003FXZA BN94-06418R Main Board IC901 EEPROM ONLY ... TV won't turn on after being off for 30+ minutes - TV shuts off by itself

Jan 05, 2016 | Samsung Televison & Video

1 Answer

TV won't turn on


It sounds that, the memory IC to your TV has damaged. This IC can be located very near to main system control IC. A very small one, with 8 solder terminals. Even though it is very small, function of it while the TV works is great. The work is a semi-skilled one, and you must have some knowledge in electronics to proceed.

Jul 09, 2012 | Akai Televison & Video

1 Answer

Proscan 42LA45H 42 in. LCD TV won't turn on, no red led when plugged


The power supply is the most likliest cause of the issue. You can get replacement power supply from www.tvcircuitboards.com

Mar 02, 2012 | Proscan 42LA45H 42 in. LCD TV

1 Answer

Remote code wanted


Hello
Three digit universal remote code for Akai TV are: 002/ 0030.
Four digit universal remote codes for Akai TV are: 0105 0002 0077 0254
Direct Code Entry
  1. Press and hold the SETUP button until the red indicator stays on, then release the SETUP button.
  2. Press and release the desired Mode button (TV, VCR, etc.). The red indicator blinks, then stays lit.
  3. Enter the 4 digit code from the code tables. Note: after a valid code entry, the red indicator turns off. For an invalid code, the red indicator flashes.
  4. With your device on, press CHANNEL UP. If the device responds, no further programming is required. Note: If some buttons do not operate your device, try one of the other codes for your brand

Jul 01, 2011 | Akai LCT3701AD 37 in. LCD Television

1 Answer

3 yr old KDL-40V3000. Remote suddenly stopped working. Changed batteries twice - didn't make any differnence. Then noticed no LEDs lit on TV front pane! But TV is powered on. Also TV can be operated...


U have a Digital Camera turn it on,take ur tv remote pushes all the remote buttons on the front of the Digital Camera.One by one buttons.If all buttons of the tv remote work will register on the Camera viewing screen,because the Digital Camera able to read infer red signal output.Will figure out wright away the tv remote work or not easily.Tv remote sensor/board have no LED power light lite up might just be a lose connection or just a dead LED lamp only,because all the buttons on the remote sensor/board to the tv panel work wright?Try website Remotes.com to buy tv original remote.

Jun 10, 2011 | Sony BRAVIA KDL-40V3000 Television

1 Answer

Red led light in front of tv is flashing red but set won't turn on when push on/off button on set or on remote


The issue is your power supply. What is the model number? I can assist you with finding the part.

Thanks,


tv_1.jpg

Dec 11, 2010 | Akai Televison & Video

1 Answer

I bought my son a 19" philips tv model # 19pfl340d/27.in order to turn tv on it must be unplugged for 10-15 minutes.The first one I bought did the same thing and I returned it.this one is exactly the...


The remote control will not operate the TV when the TV is in the OFF mode (No LED lit on front bezel). To change the mode from OFF to STANDBY or ON, press the POWER button on the side of the TV. Once the POWER button is pressed, the LED will change to either red to indicate STANDBY or green to indicate ON, whichever mode the TV was in prior to being turned off with the TV POWER button.

By pressing the POWER button on the side of the TV, the mode will toggle from OFF to either STANDBY or ON. If the POWER button is pressed and then the LED on the bezel is red, the TV is in STANDBY mode and will need to be turned on using the remote control. If the POWER button is pressed and then the LED on the bezel is green, the TV is ON.

Nov 11, 2009 | Philips 19PFL3403D/27 19 in. LCD TV

1 Answer

AKAI WONT POWER ON!


The power supply on your LCD failed and will need to be replace or repair.
Let me know if you need further assistance.

Aug 28, 2008 | Akai LCT3201AD 32 in. LCD Television

1 Answer

TV WILL NOT TURN ON


The power supply, and or one of the circuit board is defective. The set will require shop service.

Jerry G.

Jul 26, 2008 | Audiovox FPE3000 30 in. HD-Ready LCD...

3 Answers

AKAI LCT3285TA seems to be stuck in "Standby"


Greetings,

We own a small TV repair shop in Ohio and have ran into similar problems with this TV.

To fix this problem we replaced 3 caps near and in the powersuppy of the TV.

This TV is very sensitive to electrical problems ( more then most if that's possible) so check the caps near the PSU.

Over all this TV is a fairly decent product.

Aug 07, 2007 | Akai LCT3285TA 32 in. LCD Television

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

261 people viewed this question

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

69745 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

6370 Answers

yadayada
yadayada

Level 3 Expert

63661 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...