Ah, it didn't take too long for me to come across one of these...
Techwood set, using a 17MB82 main board and VES315 LED-backlit LCD panel. Utter crap TV.
Symptoms were, no picture, has sound, no backlight. Can see image on screen.
Checked LED supply, fires up briefly then collapses so tore down to panel level suspecting O/C LED. One large tab driver on panel, seems to integrate LVDS decoders too. Have to be careful, as once front of TV removed the panel is not supported at all, there is no internal metal chassis LCD panel, the LCD is built right into the case. Lovely.
Found of the LEDs, one shorted 17 ohms both ways, and one open circuit in different areas of the circuit, others test ok (my meter will make them glow on diode test with >3V O/C), although there are only 22 in total. Set is approx 18 months old, so how about that 50,000 hour lifespan? Yeah.
Ended up scraping the soldermask off the strip to test the LEDs, can't seem to remove the lenses without breaking them, and yes, it's those LEDs we all see failing in other sets.
The guy I bought it off was remarking how it was funny the remote operated his new TV, a Polaroid. Some people can't seem to put two and two together and are forever trapped in the cycle of buying crap, somehow thinking that X crap is better than Y crap because oh well I just got unlucky that last time.
Techwood set, using a 17MB82 main board and VES315 LED-backlit LCD panel. Utter crap TV.
Symptoms were, no picture, has sound, no backlight. Can see image on screen.
Checked LED supply, fires up briefly then collapses so tore down to panel level suspecting O/C LED. One large tab driver on panel, seems to integrate LVDS decoders too. Have to be careful, as once front of TV removed the panel is not supported at all, there is no internal metal chassis LCD panel, the LCD is built right into the case. Lovely.
Found of the LEDs, one shorted 17 ohms both ways, and one open circuit in different areas of the circuit, others test ok (my meter will make them glow on diode test with >3V O/C), although there are only 22 in total. Set is approx 18 months old, so how about that 50,000 hour lifespan? Yeah.
Ended up scraping the soldermask off the strip to test the LEDs, can't seem to remove the lenses without breaking them, and yes, it's those LEDs we all see failing in other sets.
The guy I bought it off was remarking how it was funny the remote operated his new TV, a Polaroid. Some people can't seem to put two and two together and are forever trapped in the cycle of buying crap, somehow thinking that X crap is better than Y crap because oh well I just got unlucky that last time.
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