Have acquired for beer money a little Insignia 26" LCD, with HDMI. Model No I think is NS-LCD26 or something...apparently it is also branded as a "Haier" in foreign countries. Anyways, the problem is the beast takes absolutely forever to warm up / power up and function normally. On a cold start the screen shows a very weak solid blue raster, none of the controls work except power on off via the front panel or remote....then over time as it warms up, the raster morphs into differing shades / colour patterns, sometimes has vertical bands or hash. Eventually after 20 to 30 minutes its stable and I can go into the menu, select inputs etc and it actually has a decent HD picture for a house brand.
Sometimes it never gets there and powers itself off, sometimes I give it a hand by aiming a blow dryer at it with the back cover off.
I have checked the power supply rails and they're all good.
There's clearly some component or another that has changed value or become intermittant when cold, yet, here's the kicker, I've sprayed every damn component on the main board and power supply with super-cold and I can't make it fail or change any warm up behavior on the screen...(also shot it into the lcd drive board under metal cover on the left side). A very frustrating problem !!!
Ideas ? Know of any common failure parts/points that could cause this behavior, Mac ?
Joined: 16 Feb 2007 Posts: 95 Location: Richmond, BC
Link Posted: Thu Feb 17, 2011 6:10 pm Post subject:
Hmmm...You could very well be right, Curt.... output voltage looked to be within spec, but perhaps if any caps have gone resistive many the output current is being limited. I did test all the caps on the PS and main board in-circuit with my ESR tester... will consider desoldering the PS ones and retest.
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