Help with Toshiba 50L2300U

[Moreno83]

Re: Help with Toshiba 50L2300U

Sorry , over looked that i guess. Never mind

[dick_barton]

Re: Help with Toshiba 50L2300U

OK. With main board disconnected, pins 10 & 14 = 5.1 V, all other pins = 0 V

Now with the mainboard still disconnected if you jumper the 5.1V standby to Power TV using a 1K resistor do the other supplies come up.
By the way what voltage do you now have at AC_Detect?

[2many]

Re: Help with Toshiba 50L2300U

Now with the mainboard still disconnected if you jumper the 5.1V standby to Power TV using a 1K resistor do the other supplies come up.
By the way what voltage do you now have at AC_Detect?

Main board still disconnected, just soldered a 1k resistor across pins 14 & 12 (5.1 v and power_tv). Only change is to pin 12 (power TV), which = 4.9 V. AC_Detect is still 0 V.

[2many]

Re: Help with Toshiba 50L2300U

With main board connected, shouldn't pin 12 power_tv normally be at 0 V? When you push the power button, then pin 12 should change to some voltage level?

[budm]

Re: Help with Toshiba 50L2300U

Well, shopjimy does not have any pictures of this power supply board PK101W01001 for me to trace out the circuit, so without super clear pictures of the top and the bottom side of the board I cannot really help you much.
Right now you have STBY Volage and the PS-ON signal.

[2many]

Re: Help with Toshiba 50L2300U

Good news! Set powers on and I have backlight!

See the middle Mosfet? It has a metal tab, unlike the other 2 which is plastic. I didn't have any TO-220 mica insulators so made one from insulator from a hair dryer, put Silicon paste on it and screwed it down with the metal screw that was removed. I wasn't thinking and got screwed by that screw ha ha which in effect grounded the drain of that Mosfet! I took the screw out and the TV powered up and I have backlights, sound and picture!. Kudos to the designers which prevented the TV from powering up and smoking parts by detecting the short circuit in the backlight power section. Now I have to find a nylon screw.

[2many]

Re: Help with Toshiba 50L2300U

I am glad the power supply blew and not the LED's. To prolong the life of the LED's, what level should I set the backlight to?

[budm]

Re: Help with Toshiba 50L2300U

Well, that is good, too bad we were missing the details on what you have done to the mounting of the MOSFET in the beginning, the old device was isolated tab but the replacement is not.

[budm]

Re: Help with Toshiba 50L2300U

I am glad the power supply blew and not the LED's. To prolong the life of the LED's, what level should I set the backlight to?

Set it to as low as you can but still give you good enough pictures.

[2many]

Re: Help with Toshiba 50L2300U

Well, that is good, too bad we were missing the details on what you have done to the mounting of the MOSFET in the beginning, the old device was isolated tab but the replacement is not.

I couldn't find the original Mosfet P0920ATF on Ebay and had to substitute a TO-220 Mosfet with a higher rating that was available on Ebay. I have never seen an isolated tab form factor like that before. What is it called? Where is the best place to buy these parts?

P0920ATF is 200 V 9 A, the replacement is an IRF640 200 V 18 A. I don't think I can find a Nylon screw tomorrow easily and want to put the set back together. I am goind to use a zip tie, let it run a bit and if it does not get too warm, just leave it at that. What do you think?

[budm]

Re: Help with Toshiba 50L2300U

You should mount it properly to the heatsink.
The original is TO-220F.
https://cdn.badcaps-static.com/pdfs/...9ac21b86bf.pdf

[prabhakar]

Re: TOSHIBA 32PU201E1 IC Number required

Hi Everyone,

Please help me to get the IC Number of the IC chip present on the Power Supply board backside of the TV Model TOSHIBA 32PU201E1.
The IC chip number got erased as the IC was damaged due to high voltage. In order to replace the IC the IC number is required.Please some one help me with the IC number if you have TOSHIBA 32PU201E1 TV Model with you.

Thanks in advance !!

[budm]

Re: TOSHIBA 32PU201E1 IC Number required

Hi Everyone,

Please help me to get the IC Number of the IC chip present on the Power Supply board backside of the TV Model TOSHIBA 32PU201E1.
The IC chip number got erased as the IC was damaged due to high voltage. In order to replace the IC the IC number is required.Please some one help me with the IC number if you have TOSHIBA 32PU201E1 TV Model with you.

Thanks in advance !!

Pictures of the board? The P/N and the version of YOUR board? The designator of the IC in question?

[2many]

Re: Help with Toshiba 50L2300U

Can someone help me find a schematic to the PS
board below? Even though the set is fixed and working, I'd like to know what those parts that blew do and what the circuit looks like.

The 2 stickers are

B178-B01 C52 REV.C 20 00014 19296 02366

03-PK101W01001-VDAFL-C50-5100-100

Stickers

B178-B01 C52 REV.C 20 00014 19296 02366


03-PK101W01001-VDAFL-C50-5100-100

[frank71x]

Re: Help with Toshiba 50L2300U

[Shortedout]

Re: Help with Toshiba 50L2300U

Hi 2many. I have the same TV with the same problem. I can see the picture if I shine a flashlight on to the screen.
My question is, how did you get to the boards? I took out the marked screws and have started to get the bezel off, but it seems to be hung up at the bottom of the screen. Anything to look for or any tricks? Do I lay it on its back and work on the bezel first?
Thanks,

[2many]

Re: Help with Toshiba 50L2300U

Been a while since I started this thread looking for help. My Toshiba is still working well after I fixed it and turned down the brightness.

As I recall, after removing the screws, the bezel has to be pryed off. It is held on with clips and there are many. Once you get one clip pryed loose, stick a piece of cardboard in there so it cannot pop back in. Look on youtube on how to take apart any LED TV. They all snap together the same way I believe.