Toshiba 55L310U

[ShortCircuited]

Right 1/3 of LCD screen is dim. Picture is good otherwise. Research suggests LED strips, but thought I would see what you pros think before I fix it until it is broke. Thanks for help/suggestions.

[nomoresonys]

Re: Toshiba 55L310U

get an led tester and save a lot of guesswork, about 20 bucks on amazon or ebay.

[dskall]

Re: Toshiba 55L310U

Looks like bad leds

[ShortCircuited]

Re: Toshiba 55L310U

Found this hot spot on secondary side of power supply board.

EDIT:
Did some more testing.

LEDs connected at 13-pin:
LED 1-: 56vdc
LED 2-: 58vdc
LED 3-: 92vdc

LEDs disconnected at 13-pin:
All are 113vdc.

[lotas]

Re: Toshiba 55L310U

This means that there are no working LEDs along the Led3 line.

[ShortCircuited]

Re: Toshiba 55L310U

Dim side-closest to camera lense-is the darker side. LEDs glowing but very poorly and must be the LED3 circuit lotas suggested. Looks like 12 strips total. So it must be 12 vertical strips. Could I get away with just replacing 4 strips instead of all 12? Amazing this TV is almost not worth fixing.


EDIT: Pulled led strips and found one bad bulb on far right (fourth from bottom) and another on fourth strip from right bulb (upper-most).

[ShortCircuited]

Re: Toshiba 55L310U

Can we buy just the diodes and replace individually on the strips? I pulled the faulty LEDs and jumped with wire and now all LEDs work, except the two missing of course. I only need two diodes then epoxy the diffusers back to the strip.

P.S.: This is not a resell TV.

[lotas]

Re: Toshiba 55L310U

It is better to replace everything at once with new ones (they have begun to degrade the crystal), if you change only two leds, then wait for a repeat, others will start to burn and each time you will have to change them.

[dskall]

Re: Toshiba 55L310U

You can fix however you like. You will see some color variation from the ones you replace.

[ShortCircuited]

Re: Toshiba 55L310U

Thanks all for the help. It's fixed and good enough now for a free TV.

[dskall]

Re: Toshiba 55L310U

Turn down the backlights as low as possible.

[Davi.p]

Re: Toshiba 55L310U

check soldering on the diodes of the psb