Tip & How-To about Televison & Video

Samsung LNR408DXX XAA

TV has sound but no picture and the menu won't display.
Remove back, inner cover that is over the pc boards.
On LCD controller board next to the connector that goes to LCD panel check
cp this is a surface mounted component remove it and put a jumper in its place. I have done this and the result was a working TV.

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How to repair LG LCD TV 47LG70-UA no picture or sound


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Mar 12, 2016 | LG Televison & Video

1 Answer

Sound but no display


ok I have ran across this before.. First turn on the TV and go to a channel u know is good, with sound.. now turn off lights in the room.. or just darken the room.. next take a FLASHLIGHT and turn it on and shine it into the front of TV . If u see the images on the screen when moving the flashlight around. that is a good sign.. That usually means the Backlight board or boards are not working..with the TV on and in a darken room you should be able to see light coming through some of the Vent holes in the back cover, that means the Backlight board is working. from what u say I would bet on the backlight boards. pretty easy fix.. Unplug from the AC outlet. remove the back. Now be careful back there cause u can still get Zapped. I ALWAYS take pictures of the back (close up of the model and serial #'s) I take several pictures of the inside of the TV. some TV's have the Backlight board or boards on the side of the screen and some have the backlight inverter built in the main board, since u have already replace the main board u must have backlights separated. . Take close up shots of the board, and write down all the #'s from the board and when u order make sure u order the exact one..I never remove the bad board till I have the new one ready to install. I always go to ShopJimmy.com first to see if they have the part. Then I check Amazon, and then eBay. in that order.try to buy NEW boards if u can.. Hope this helps.

Mar 20, 2015 | Vizio E470VL 47 in. HD-Ready LCD TV

1 Answer

vo42l no picture. please help!


I had the same problem. No picture but sound. When I turned on the tv, and shined a flashlight around the screen from about 3 inches away, I could it was displaying something.

At first I replaced the main board which has 0171-2272-2604 stamped on it. You can google Vizio VO42L service manual and get a pdf which will show how to remove the back. I got the board from TSM www.tristatemodule.com3642-0482-0150 3642-0482-0150 Vizio TV Module, main unit, 0171-2272-2604, 3642-0482-0395, VO42LFHDTV10A 1 $88.95 $88.95


Order Notes: None
SubTotal:
$88.95 Shipping: USPS Priority $20.00 Tax:
$0.00 Total:
$108.95 However, after I replaced this board I still had the same problem. So next I replaced the Invertor boards. There is a Master and a Slave board to the right and left sides of the main board. I ordered these from Coppell tv.
on Ebay.
6632L-0470A & 6632L-0471A INVERTER REPLACEMENT SET - NEW, OEM, WARRANTY ( 110882329800 ) 110882329800_1.jpg Paid on Jun-08-12
$49.99 -
1
$49.99
USPS First Class Package Estimated delivery: June 13, 2012
These are compatible replacement inverter boards and work well. All I had to do was bend a tab on the aluminum cover that goes over the boards. After installing these inverter boards the Vizio display works. I started with main board replacement because from what I read online, the problem was either the mainboard (which had the most posts) or the inverter boards. So I picked one.
Install tips:
Download the PDF Service Manual VO42L FHDTV10A_LPL,AUO Service Manual.pdf for some help with the back cover.
When you take all the screws out, set them aside in the same pattern they were on the board for ease of putting the back in.
I was not able to remove the connector on the Ribbon cable between the master and slave invertor, so I left it attached and carefully undid all the tape and removed the boards attached. I plan to send the old boards to Coppell TV (really nice to work with) for their re-use.
I hope this helps.

Feb 27, 2012 | Vizio VO42L 42 in. LCD TV

1 Answer

No Picture, No Sound While Watching


Resetting the TV
If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:

NOTE:
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time.
1. Unplug the TV power cord from the power outlet.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.



LCD TV TroubleshootingThe defective LCD TV may have the following common symptoms:

Symptom: No picture on screen but LCD TV still has sound.
Solutions: The problem is cause by defective inverter. Replacing ivnerter will solve hte problem. Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound.
Solutions: The problem is cause by defective inverter. Symptom: Blue Screen but no picture
Solutions: The problem is cause by defective Main Board(AD Board). In some cases, this problem may cause by the defective Screen Controller board. Thsi board is mounting on teh back of LCD TV Scree. Symptom: Power light stays on but no display and sound
Solutions: The problem is cause by defective Main Board(AD Board) or Power supply board. Symptom: No Power or Power indicate light does not lits
Solutions: The problem could cause either by defective Power supply board or defective Main Board(AD Board). Symptom: Screen is half dim and half bright
Solutions: The problem is cause by defective LCD Panel.It needs to be replace.


Hope it may help you;

Regards;
VOTIT

Jan 29, 2009 | RCA L37WD250 37 in. LCD HDTV

1 Answer

Blank screen, cannot get menu to display, but sound works


Does the lcd screen have a glow to it ? Or is it really dim if u get real close to screen u can see images moving ?
it it has a glow to it you panel lighting is fine but you control board is bad. If you have a dark screen and see faint images you panel back lighting is out u can check the power with a meter at the connection to inverter board on panel.

May 03, 2008 | Televison & Video

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