Sony KDL-46Z4100 T-Con fuse and diode

[Sevenqi]

I got two Sony KDL-46z4100, same problem: blank screen, then shut off gave 14 blinks.
This is the t-con problem, part number 1-877-777-11, I checked all the fuses, F603 was open for both t-cons. I replaced one of the t-con fuse, TV works for 2 hours and then shut off gave 14 blinks again.
I checked the replaced fuse, not open, the other fuses are fine, looks like something else burnt.

When I measured one of the diode (815B), surprised the resistance is not the same as others (There are 4 the same diodes near by). I thought this is the problem.

I did a research but still not find any datasheet or specs for this 815B diode (R825 marked under 815B).

[tom66]

Re: Sony KDL-46Z4100 T-Con fuse and diode

A bad diode would blow the fuse almost immediately - certainly the TV wouldn't work well.
Make sure to use the correct rating time delay fuse.

[Sevenqi]

Re: Sony KDL-46Z4100 T-Con fuse and diode

I used the same specs fuse to replace, though this is not the smd type.
The bad diode is not totally shorted, but less resistenace then others. May be this is the IC problem ? I measured it on board.
Anyone have glue what the 815B diode is ?

[tom66]

Re: Sony KDL-46Z4100 T-Con fuse and diode

It's an ONSEMI diode, looks like SMC or SOD123 package, with J-Leads, device code is B825 (top line is date code)
Couldn't find an exact match though sorry.

[seacomb]

Re: Sony KDL-46Z4100 T-Con fuse and diode

Hi, I have a sony 46z4100 with the same problem. It works a few hours and then cuts off. Did you ever find a solution? Thank you.

[ALittlebit]

Re: Sony KDL-46Z4100 T-Con fuse and diode

This is all great info! Did we ever find a cure?!

[MICHAEL41]

Re: Sony KDL-46Z4100 T-Con fuse and diode

fuse f603 open ,i check chip 9853a pin 1 and pin 12,look like that chip bad.need to replace that chip first.

[steves7839]

Re: Sony KDL-46Z4100 T-Con fuse and diode

Just bought a T-Con to replace motion blur, it has F603 open. Did F603 and IC 9853a fix the T-Con?

[Davi.p]

Re: Sony KDL-46Z4100 T-Con fuse and diode

AS ALWAYS, if one fault is time definte is also heat related, so you have to monitor with finger or thermocamera which component goes hot and after make cooling-warming cycles with freezer spray to isolate the culprit.

[dskall]

Re: Sony KDL-46Z4100 T-Con fuse and diode

I used the same specs fuse to replace, though this is not the smd type.
The bad diode is not totally shorted, but less resistenace then others. May be this is the IC problem ? I measured it on board.
Anyone have glue what the 815B diode is ?

Looks like that diode is in parallel with resistor so would have to lift diode to test.