NEC LCD TV LNT-30CW no colour

Nov 11, 2009 3 Replies
T

I was given this defective LCD TV. It had no working backlight. I located a faulty transformer, one of 8, and replaced it. Backlight is working now.



However, the only way to get colour is when I use the component inputs. I don't believe the 2 faults are connected, in fact I don't even know if the colour problem could be fixed by setup. I got no service manual.



Has anyone out there an idea where I could start?



Cheers



Tony PS:(I am running the unit on an temporary PSU. The original PSU was missing (24V 6A) and the one I ordered on eBay (China)had the 4 pins wrongly connected, believe it or not! Rotated by 90 deg. Lucky it just shorted and didn't reverse the voltage...)


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F

On Wed, 11 Nov 2009 11:12:45 +0800, TonyS put finger to keyboard and composed:

Have you checked the 4.43MHz crystal (or 8.86MHz)?

Have you tried feeding the TV an NTSC signal (from a region 1 DVD) via the composite inputs?

- Franc Zabkar

Please remove one \'i\' from my address when replying by email.
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T

The thing has a big 144pin VSP9427B chip "Color Decoder and Scan-Rate Converter" from Micronas which is clocked by a single 20.25 MHz crystal.

don't have such a beast...

Thanks anyway. It's not commercial, so I am using only the component inputs for now.

Tony

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