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Equipment Repairs => LCD TV forum => Topic started by: digitech1962 on February 18, 2011,13:44:09

Title: Sharp LC37X20E pic fault
Post by: digitech1962 on February 18, 2011,13:44:09

This TV has lines on the picture, looks like watermarks, 7 lines in total (pic attached)

Title: Re: Sharp LC37X20E pic fault
Post by: Kilroys on February 19, 2011,08:15:13

It looks like lamp tube damage.
Here is a few point to check.
See if the serial number is in the following range

xxx411112 ~ xxx416646
xxx511112 ~ xxx517834
xxx611112 ~ xxx632500
xxx811112 ~ xxx811112
709011112 ~ 711016906

if yes then
check if any of the lamps have any crack
or any discoloration in yellow.
If so, replace the defect lamp.

check if any of the lamp sockets have any damaged marks.
If so, replace the defect lamp socket.

Title: Re: Sharp LC37X20E pic fault
Post by: Turnip on February 20, 2011,11:48:20

Hi,

Note from piccy that problem seems LHS of screen only - Backlight tubes usually extend right across the screen but LVDS on large screen sets often have a drive chip for either side.

Just a thought as I have one with a similar (but different) prob - Chris

Title: Re: Sharp LC37X20E pic fault
Post by: sparky on February 20, 2011,13:52:53

hi
chris if you split the screen you can see were the tubes do
show signs of discolouring from the ends to middle
dave

Title: Re: Sharp LC37X20E pic fault
Post by: Turnip on February 21, 2011,11:50:27

Hi Sparky,

Well could be, but haven't yet met a CCFL tube that's OK to half way point then becomes duff the rest of the way.

Roll on cool diodes, where individual ones will pop out and give curious thumb-prints. Can't wait - Chris.

Title: Re: Sharp LC37X20E pic fault
Post by: digitech1962 on February 21, 2011,15:57:22

The lines on screen are wavey and not all the way across screen' also some run vertical from top but only  1cm long.   may order tecon to check?

Title: Re: Sharp LC37X20E pic fault
Post by: Turnip on February 22, 2011,13:14:20

Hi DT,

Now you tell us probs can be vertical. Never met vertical tubes - gives us more piccies if you fancy it.

Tcons can be an expensive hobby - just don't ask - Chris.

Title: Re: Sharp LC37X20E pic fault
Post by: watteau on August 12, 2011,08:13:12

Hi,
Just come across this post, but replying now for future reference.

This is a common problem on this model.
The diffuser  behind the LCD panel has a plastic membrane on it,
and this bubbles/separates from the main plastic panel.
There is a mod. kit to replace the diffuser screens (3) at about £100
Regards,
John

Title: Re: Sharp LC37X20E pic fault
Post by: digitech1962 on August 17, 2011,07:44:11

Thanks who stocks them many thanks dave.

Title: Re: Sharp LC37X20E pic fault
Post by: watteau on August 18, 2011,05:52:14

Hi,
As far as I know, they're only available from Sharp themselves.
Not sure if they can be reclaimed from a faulty, display of the
same size etc.
Attached is some more info. on the repair procedure.
Regards,
John.