39L22U Toshiba LED TV

[Gonnafix]

All of a sudden our TV just shut off last night as we were watching the last episode of Narcos.. I had been using an TERK HDMI switcher on the unit w power supply. Will not power up, no lights..nada. Can't find any resources on this model whatsoever. Does anyone have a schematic for this unit? I'm not getting the 12v on the indicated port on PS.

[Andrew F. Ali]

Re: 39L22U Toshiba LED TV

Does the Power light come on at the front? are you getting StdBy 5Vdc? (It may be 3.6Vdc)

[CapLeaker]

Re: 39L22U Toshiba LED TV

Pictures of the PSU?

[Gonnafix]

Re: 39L22U Toshiba LED TV

Does the Power light come on at the front? are you getting StdBy 5Vdc? (It may be 3.6Vdc)

No power light.

I'm not seeing a mark for StdBy.
Just these:
BLON
DIM
ACD
PWON
5vcc
12Vcc
GND
12Va
GND

Thank you!

[Gonnafix]

Re: 39L22U Toshiba LED TV

Power supply is PK101W0000I

[CapLeaker]

Re: 39L22U Toshiba LED TV

check if 5vcc is there

[Gonnafix]

Re: 39L22U Toshiba LED TV

5vcc would be 5v DC correct? No voltage..

[Gonnafix]

Re: 39L22U Toshiba LED TV

Just making sure here.. Do I check using the 5vcc and GND contacts on that connection point?

[CapLeaker]

Re: 39L22U Toshiba LED TV

yes

[Gonnafix]

Re: 39L22U Toshiba LED TV

No voltage.

[CapLeaker]

Re: 39L22U Toshiba LED TV

O.k. So now you have to be really carefully as you are going to be checking the primary side of the power supply. Measure if you have any DC power on the 2 long brown filter caps. Don't slip. Positive and Negative on each capacitor. You should see 170V DC or so.
Check that 4A fuse (with the power off) and your meter set to resistance (Ohms)

We also are going to need a picture of the backside of the PSU.

[Gonnafix]

Re: 39L22U Toshiba LED TV

No voltage at the 12Vcc or 12Va either..

[CapLeaker]

Re: 39L22U Toshiba LED TV

we have to figure out why there isn't any 5v there. Without it nothing is going to work.

[Gonnafix]

Re: 39L22U Toshiba LED TV

Reading on both caps is .3

[Gonnafix]

Re: 39L22U Toshiba LED TV

Fuse is blown.. this seems to good to be true.

[CapLeaker]

Re: 39L22U Toshiba LED TV

unplug the psu and check that white fuse with your meter set to resistance, measure across the fuse.

[CapLeaker]

Re: 39L22U Toshiba LED TV

O.k. if the fuse is blown, to 99.% there is something else bad too. So you would have to check all diodes, and Mosfets for a short in the primary circuit. Also check the bridge rectifier for a short. PSU not connected to power anymore of course.

[Gonnafix]

Re: 39L22U Toshiba LED TV

Will do. Going to go get some fuses and a 60watt soldering iron. I suspect it will have a few bad parts. I just don't want to buy a replacement PSU. What fun would that be?

[anotherdude]

Re: 39L22U Toshiba LED TV

Will do. Going to go get some fuses and a 60watt soldering iron. I suspect it will have a few bad parts. I just don't want to buy a replacement PSU. What fun would that be?

60 watt?

30 watt max i'd say

[Gonnafix]

Re: 39L22U Toshiba LED TV

60 watt?

30 watt max i'd say

I'll stick to the 30 then..