Re: Toshiba 50L 1400u No Power, No Standby, wont start
Thank You everyone for your help. Got the new main board today and indeed that was the fix. I learned alot in the process , thanks to you guys.
Midwestside
Member
Last Activity: 07-03-2017, 04:58 PM
Joined: 06-28-2017
Location: greensboro, nc
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
Thanks BudM.
I was ready to shell out the money for either board, one at a time.
I just wanted to make sure someone could tell me which as im just sort of learning this stuff. (can troubleshoot vintage audio recievers pretty good)...Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
TLDR: Basically no voltage change on or off, in the way you mean....Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
Just to clarify. I power on my set by plugging the cord into the socket.
The physical power button seems to do nothing. The TV is just 'on' or 'off'
based on plugging or unplugging the cord. When i mean 'on' i mean i can take readings,, no functionality, no backlight ( ive removed the 680 ohm resistor budm got me to test that actually got the back light LED to come on. I have since put the BL-0n wire back in the harness as normal and removed the 680 ohm resistor being used as a jumper)
...Last edited by Midwestside; 06-30-2017, 07:34 AM.Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
Yes indeed, Backlight comes on with 680k resistor installed, Blon pin/wire removed. No other functionality however.
Solder joints seem ok under large magnifier loop inspection. No solder bridges either...Last edited by Midwestside; 06-29-2017, 02:07 PM.Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
So basically the main board perhaps needs to tell the powerboard 'to do stuff and isn't"
I got to the point where my knowledge ends. thats why i posted before getting into buying boards....Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
I dont mind just buying a power board, if its gonna be a goose chase.
consensus is the power board and not the main board, correct?Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
Just joined. did not initially see pics could be hosted here.
Here are the two boards....Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
The actual power button measured like 3.3v when i pressed it. it went to 0,
but when i released, it went back to 3.3v (this is on the powerbutton itself on the main board)
I will try to upload pics here....Last edited by Midwestside; 06-29-2017, 09:24 AM.Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
Which piece is the voltage boost converter? is it the sheilded piece, middle of board with the 2 transistors underneath?
I think my lead is probably touching the 5v and the BLON accidentally.
"led lights up" Yes i mean the entire back light....Leave a comment:
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Re: Toshiba 50L 1400u No Power, No Standby, wont start
I cannot tell any noticeable differences between standby and pressing the power button reflected by the volt readings. Also no standby light to tell me 'its plugged in'
These are th readings as follows off the the 15 pin connector on the powerboard itself. I was encouraged to see touchine pin 13.. seemed to light the led board up and could see the light through the case holes, as i have the tv lying on its face. I couldn't get around to see anything was happening on the standby light or the screen itself.
...Last edited by Midwestside; 06-29-2017, 07:23 AM.Leave a comment:
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Toshiba 50L 1400u No Power, No Standby, wont start
Found another (incomplete) thread about this tv, and perhaps the same problem. however it was not solved , so i figured i'd start a new thread about my unit.
I have included pics of the power board and the main board.
Fuse is oK. I checked voltages going from PWB to main board.
Leaving out of the PWB is a harness with 15 pins.
pin 1-3, 8 has 12v going out like it is supposed to.
pins 10,14 have 5v going out like it is supposed to.
The other side of the harness connected to the main board is receiving corresponding voltages that are being sent...Last edited by Midwestside; 06-28-2017, 11:54 PM. -
Re: New Members - please post your introductions here
Name is John.
I started out as a vintage audio gear collector , who started learning electronics as a part of the hobby.
Lurked around here for awhile and just joined, hope to learn lots and become proficient at everything electronic.Leave a comment:
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