Hitachi 42HXT12U - Not working - Standby LED Flashes

[dick_barton]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

Are they the ones with the purple marker alongside. Why do you believe they are broken? Did you double check your readings.

[Jack828]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

Yes, should've said.

I identify which traces are + and - by applying the multimeter in diode mode to each trace area using trial and error. When I've figured out which lights up an LED, I move to the next strip and try the same pads.

The marked LEDs do not light up when touching the same pads that lit up the LED on another strip.

(Of course, I had to do this twice, once for A strip and once again for C)

Hope that makes sense!

[dick_barton]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

Yes, that would seem to be OK.

[Jack828]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

Awesome! Probably gunna have to buy a full set of LEDs as they seem to be cheaper than getting them individually.

Can't wait to get the dining room table back!

[dick_barton]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

If your willing to wait for delivery then this may be of interest.
https://www.aliexpress.com/i/32925691852.html

[Jack828]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

Appreciate you sending over that link but I ended up buying the £33 pack off Ebay.

So thanks for all your help mate - we're all working again now!

Saved another rebadged vestel from the tip.

[alfatv]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

That backlight uniformity is quite bad. Replacing all strips might improve it. LG LB series is another typical case, trying to stay away from them.

[dick_barton]

Re: Hitachi 42HXT12U - Not working - Standby LED Flashes

Turn the backlight (not to be confused with the brightness or contrast) down as much as possible to reduce the wear on the leds and extend their lifetime.