Question about LG RZ-20LA70 20 in. LCD Television

3 Answers

LG RZ-23LZ40 no Picture

Used TV one night and turned off with remote. Next morning I have no sound or picture. Tried different input modes / setup / volume control to max still the same. Cannot even get the menu on the screen. Only thing working is the on / off red/green indicicator responding to remote control and push button on unit. Checked output voltages from switchmode supply to top board housing reciever and what looks like the main processor. 24v, 30v and 15v outputs all ok. Have not proceeded any further. Suspect that no sound is due to no channels are programmed as we do not use the internal tuner.

If you can help it would be much appreciated.

Posted by on

  • 2 more comments 
  • cugar63 May 24, 2008

    Thanks Jaime867,



    This morning proceeded too take LCD screen apart. On, what I call, LCD driver board, found 2 OP Amps blown, one diode blown and one transistor severely over-heated to the point I cannot identify component number (burn marks on protective coverings etc). Probably a problem with power delivery circuit to LCD. I have pictures if you require for your log. I need schematics and or repair manual too determine source of suspected short circuit that overheated components, otherwise I will take a 5 year warrantee on my next LCD TV and not a LG brand! (2.4 years from purchase).



    I am now using an old TV that is 15 years + old...Panasonic! Good Japanese stuff made in China with decent quality control. Won't buy cheap again.



    I still would like to resolve problem and post to you for future LG suffer's.



    Thanks again



    Cugar63

  • cugar63 May 25, 2008

    sueandjohnnes@bigpond.com

  • cugar63 May 26, 2008

    Jaime867

    My fault not a name I usually use: sueandjohannes@bigpond.com



    Thanks for

    patience

  • yleon64 Jan 02, 2009

    My Lg 37LC3R'MH did the same what is the problem?

×

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hi Jaime867
I have sale Pb as
Can you send me service manual Spinnumber at Hotmail.com

Best regards

Posted on Sep 06, 2008

Thanks Jaime867

Best send repair manual.

I have pics to show / identify problem but I cannot attach to my reply. Parts defective are: 4532M x 2 (UC2 & 3), diode next to diode RC22 & cap C35 and IC6 (cannot see part number). Board number is YPNL-M007B r1.0, also recognized L.G. Phillips part number: LC230W01-A2

My hands are not as steady as years ago to do surface mount solerering but my wife can as she has done this before being electronic equipment assembler.

As stated before I need to find source of what I suspect is short that had blown these components.

I bet a replacement board is more expencive than a new LCD TV!, but I want to resolve this prob and maybe help others...LG too.

Thanks Heaps Jaime867!

Cugar63

Posted on May 25, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,267 Answers

I would suggest to check the standby voltages as well. If the 5 volts are not present you will not get video or the TV will not operate properly.

Posted on May 23, 2008

  • 1 more comment 
  • Jaime Hernandez May 24, 2008

    Let me know the reference designators of the parts you need, or even better i can send you the service manual if you need it.

    I have it.

  • Jaime Hernandez May 25, 2008

    I will need your email address to send you the service manual.

  • Jaime Hernandez May 26, 2008

    I tried to send you the service manual but it failed. I got the following message:

    Final-Recipient: rfc822;sueandjohnnes@bigpond.com
    Action: failed
    Status: 5.5.0
    Diagnostic-Code: smtp;550 Invalid recipient: <sueandjohnnes@bigpond.com>

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Tv has sound but no picture, nothing shows with the flashlight test, all inputs have sound but no picture, installed a new t-con card with no results ?


Use a voltmeter to verify the different voltages on the power supply board are present within tolerance. Look for discolored , puffy or domed capacitors. Repair kits and complete replacement boards can be had from: TV Parts Universal TV Stands DLP Chips ShopJimmy

Feb 17, 2016 | LG Flat Panel Televisions

2 Answers

Black screen with sound


My 47" LCD Smart T.V. was working fine last night. I got up this morning and I have sound but no picture. The VIZIO icon lights up as usual but I get no picture, only sound. From the time I turned it on, nothing appeared on the screen. I have already tried unplugging it for a while and still nothing.

Oct 24, 2012 | Vizio VO47L 47 in. LCD TV

1 Answer

Hi, I have an LG RZ-20A70 TV and when i watch TV or play xbox the side are cut off the screen. (think its the picture ratio) any idea how to change this? as i have tried everything!


yes it is a picture ratio issue .
You need to look for the main menu tv setup button, its green on my lg remote .
Once you select this you should have an option to change screen ratio to 16.2 or wide screen if your tv supports wide screen .
Look for a little tv icon on screen and select that ,this should get you to pic set .

Jun 16, 2011 | LG RZ-20LA70 20 in. LCD Television

1 Answer

I have great sound on my tv but there is no picture


i had the same problem take the back off an unplug the lcd an give it a blow put bit all back together an fany's your ant

Apr 24, 2010 | Sanyo DP37647 37 in. LCD TV

1 Answer

Sound no picture


backlight invertor board/does it flash when powered on

Apr 20, 2010 | LG 32LB9D TV

2 Answers

LG 32LP1D TV no power


Check the fuse on the power board. If ok change the power board.

Nov 01, 2009 | Flat Panel Televisions

1 Answer

No picture or response - LG LCD TV


Hi, I have the exact same problem. I was wondering if you could tell me how you fixed it? Mine is only 2 hours old from the box

Jun 03, 2009 | LG 42LG30 42 in. LCD HDTV

1 Answer

Sound but no picture


check with a flashlight against the screen for picture, if present backlight inverter has failed.

Dec 07, 2008 | iLO 3200 32 in. LCD Television

Not finding what you are looking for?
LG RZ-20LA70 20 in. LCD Television Logo

1,139 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Flat Panel Televisions Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18298 Answers

The Knight
The Knight

Level 3 Expert

68197 Answers

Are you a LG Flat Panel Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...