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.

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  • 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?

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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

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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>

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