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kkearsey
Joined: 07 Oct 2016
Posts: 4
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 Posted: Fri Oct 07, 2016 9:52 am Post subject: toshiba 58l1350uc - Not Turning ON |
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I have a 58" Toshiba 58l1350uc TV. I was watching tv one day and it turned off by itself. There is no sign of power, no lights, no audio.
I checked voltage at the AC in at it read 120V, and I read 5.0V to the mainboard from Power board. I also read 3.3V to power button. I replaced the mainboard yesterday with no change in the TV.
Any ideas where to check next?
Thanks, |
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JTS1957
Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away
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| Posted: Fri Oct 07, 2016 2:09 pm Post subject: |
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See if PWRON toggles with each press of power button.
Check FET Q301. |
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kkearsey
Joined: 07 Oct 2016
Posts: 4
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| Posted: Sat Oct 08, 2016 6:54 am Post subject: |
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| Thanks for the response. I'm not that tech savvy. But what do you mean toggle? And should I just be checking for a certain value on q301? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away
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| Posted: Sat Oct 08, 2016 10:25 am Post subject: |
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| kkearsey wrote: | | I read 5.0V to the mainboard from Power board. |
Power Supply/LED Driver board Connector P802 - Pins# 10 and 14 = 5VCC - 5 volts VCC - There all the time the set is supplied with Mains (120V AC) power.
P802 Pin# 12 = PWON Power on/off - This pin should change (toggle) from one voltage state to another with each press of the Power Button (example: 0 volts to 5 volts). Of course, the set has to be supplied with Mains power.
Both the above reference GND2 (Chassis).
| kkearsey wrote: | | And should I just be checking for a certain value on q301 |
Measuring for continuity between pins - looking for dead shorts. |
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kkearsey
Joined: 07 Oct 2016
Posts: 4
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| Posted: Mon Oct 10, 2016 11:04 am Post subject: |
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| PWON is showing 2.9v even when power button is pressed. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away
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| Posted: Mon Oct 10, 2016 12:07 pm Post subject: |
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| JTS1957 wrote: | | This pin should change (toggle) from one voltage state to another with each press of the Power Button (example: 0 volts to 5 volts. |
Does that pin do 2.9 volts irregardless of how many presses of the Power button occur? Is it the same for both Main boards?
Can you confirm Power and Main board part numbers? |
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kkearsey
Joined: 07 Oct 2016
Posts: 4
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| Posted: Tue Oct 11, 2016 4:04 pm Post subject: |
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| It is 2.9 continuously no matter how many times I push power button. I don't have the original main board. I had to send that back to manufacturer. Power board was never changed |
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JTS1957
Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away
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| Posted: Tue Oct 11, 2016 4:16 pm Post subject: |
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| Take a 1000 ohm resistor. Momentarily hook one end to the PWON pin and the other to Ground. Once the magic smoke clears (jk) report results. |
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gamermitch
Joined: 27 Nov 2016
Posts: 3
Location: Ontario
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| Posted: Sun Nov 27, 2016 11:33 pm Post subject: |
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| I am having the same problem with my TV but I can't even get the thing apart without breaking it... do I have to take the front edge pieces off or what? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away
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| Posted: Mon Nov 28, 2016 6:49 am Post subject: |
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| In my perusing of the web, I discovered two other persons with this set who were able to remove the back cover. |
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