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Equipment Repairs => LCD TV forum => Topic started by: Rufos on September 18, 2012,12:42:51

Title: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 18, 2012,12:42:51

Hello everyone
I have a problem I'm trying to solve for a long time.
I have this TV and it is not turning on.

I opened the TV and found a burnt switch(Chip STR-Z4569) located on the power supply, of course, I changed it with a new one and hoped it would solve the problem, unfortunately not.

I connect the tv to electricity, control light is on, pressing On,  control light is on(Red), sound relay click, and nothing happens, the screen stays black.

Clicking on the button again nothing happens except a click from the relay.

i tried to look for blown capacitors or some other defective components and everything looks good.

hope that some one will be able to help
Thanks 

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: fix2003 on September 19, 2012,02:42:35

only get wlt66s in my country try checking
D809 23357905 DIODE, ZENER, MTZJ36C
or
IC420 MP210SDJ Part 79104807. It is in the center metal pcb surrounded by metal screening can, under DVBT module in the center of TV. The part is very small SMD. It's location is looking at pcb to the top center to the right hand side underside (buy toshiba version not the sony version)

as you have changed STR-W6765 do you replace the  22MF/50V on supply rail for this ic and reflow all transformers

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 19, 2012,09:34:13

Hi

i changed the STR-Z4569 chip and the 450v 120mf ic( the capacitor was blown)
what is the correct way for checking Zener diods?

im adding hi rez close up of the STR-Z4569 area- if you can direct me to the component that i need to check it will be great.

i didnt reflowed the transformers - is it that necessary ?

i was also told to check the F3 fuse .
thanks 

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: fix2003 on September 19, 2012,09:57:41

check / change the 2 green coloured capacitors near to the regulator you have changed
the transformers sometimes have poor joint this can be very hard to see so best to resolder all these joints

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: fix2003 on September 19, 2012,10:00:20

http://www.alldatasheet.com/datasheet-pdf/pdf/281921/SEMTECH_ELEC/MTZJ36C.html
data sheet for zener replace if not sure

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 19, 2012,15:37:56

Quote from: FIXITNOW on September 19, 2012,09:57:41

check / change the 2 green coloured capacitors near to the regulator you have changed
the transformers sometimes have poor joint this can be very hard to see so best to resolder all these joints

hi you talk about the small flat capacitors or about the rounded capacitors ?

thanks

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: fix2003 on September 20, 2012,02:44:36

the 2 round green coloured ones in your uploaded picture

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 20, 2012,03:27:31

ok thanks

ill check them and update .

:)

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 20, 2012,16:35:05

hi
i rechecked the caps and they look good- unfortunately i dont have esr meter.

i checked the resistors and i noticed that some of the dont beep when i check  them

r-807
r-817
r-801
r-899
r-03
r-04
r-17

one more thing that i noticed is that it looks like there is missing components on the board - before i gat the tv it was in repair shop.

i add zoom photos - i really dont know maybe it suppose to be like that.

 i found pic on ebay of this supply and it looks ok - there is also missing parts .
 

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: fix2003 on September 21, 2012,03:02:59

in that case change the 2 caps as they are know to give problems but still look ok

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 21, 2012,15:31:52

thanks

tomorrow ill buy new camp and update

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 23, 2012,09:59:55

hi

i just replace the two caps with new one that i got and also the fuse and nothing works

i get the red standby led - when i push the on button  there is a click from the really but nothing pops on the screen.

 

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 26, 2012,18:35:45

UP :sign0085:

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: fix2003 on September 27, 2012,02:48:58

you have tried all i know
i guess now you need some boards to swap out :c023:

Title: Re: Toshiba 37WL66Es-Not turn on
Post by: Rufos on September 27, 2012,06:37:11

hi

maybe you know what is the voltage that goes to the back light

i want to power it using external power supply so ill be able to know if there is any problems or not

Thanks