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Service manuals & datasheets => LCD TV forum => Topic started by: Remotecentral on June 23, 2008,03:20:01

Title: LG 20LS7D Service manual anyone Inverter problem
Post by: Remotecentral on June 23, 2008,03:20:01

Hey guys great site here. Im looking for a service manual for a LG 20ls7d.  I think ive got a problem with the inverter board, caps look good but i havent done much testing. Problem is when the tv is powered on the backlight comes on for a second then back off. Have sound and faint picture so its definately a backlight problem. Anyone know what causes this or have the service manual. Thanks in advance.

Title: Re: LG 20LS7D Service manual anyone Inverter problem
Post by: E.R.S. on June 23, 2008,15:40:19

First thing to check is the inverter transformers depending how many
there is you need to check the windings resistance. check them
against each other to see if one has a high resistance.
I had a LG with a Darfon inverter board with the same fault that was a transformer one of the windings had a high resistance.

Title: Re: LG 20LS7D Service manual anyone Inverter problem
Post by: Remotecentral on June 23, 2008,16:51:17

Thanks for the fast response.  I have 2 questions on your response. How do i safely discharge the board to avoid shock or damage? If a transformer is bad where could i find a replacement? thanks