proscan 40ld45q - no pic -no sound - no backlight - blue light turns off

[blind2reply]

proscan 40ld45q

Have tried published resets with no help. (unplug for 10, push on-off for 30, push menu and vol +, etc.)

After being plugged in, red light comes on. Push power button and blue light comes on for ~five seconds then goes out. Power button does not turn the unit on a second time - have to unplug/re-plug before power button will try to start with blue light.

No sound, no picture (used flashlight test).

No bulging cap, no burn spots, no burn smells, nothing visual (cold joints/breaks/bugs).

Digital voltmeter; confirmed 24 Volts in two location on conf3 - these die after the blue light goes off (power supply shutting down?), also confirm 5VDC and 12 V DC at conf3 when blue light is on.

Is the a backlight fault that shuts down the unit and locks it up?

Thanks for any guidance...

D

[neilc6]

Re: proscan 40ld45q - no pic -no sound - no backlight - blue light turns off

This is an old LCD with CCFL backlights. They do have error shut down and fluorescents do have limited life. Spending any more than $10 on parts or repair is more than the TV is worth. Working on the inverter section, you are dealing with deadly high voltages in the thousand volt range.

[blind2reply]

Re: proscan 40ld45q - no pic -no sound - no backlight - blue light turns off

This is an old LCD with CCFL backlights. They do have error shut down and fluorescents do have limited life. Spending any more than $10 on parts or repair is more than the TV is worth. Working on the inverter section, you are dealing with deadly high voltages in the thousand volt range.

Thanks for the wisdom - I suspected bad backlights would trigger the shutdown and lockup - it goes to the trash... Though I may scavenge the Tcon, PS and main board for sale on Ebay... maybe not even worth that effort, though...

Thanks Neil.