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I have a toshiba 55ht1u led tv no sound no pic or backlight…

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I have a toshiba 55ht1u...
I have a toshiba 55ht1u led tv no sound no pic or backlight only the green light comes on. I have replaces the burnt master backup boards 1&2 but not the slave boards i have also replaced the power and main boards all to no effect whats next
Submitted: 2 years ago.Category: TV
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Answered in 2 minutes by:
2/18/2016
TV Technician: Anthony_Infotech, Technician replied 2 years ago
Anthony_Infotech
Anthony_Infotech, Technician
Category: TV
Satisfied Customers: 15,969
Experience: 20+ years experience TV expert (field and bench) 9 approved qualifications in TV-ELECTRONICS
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Hello

Welcome

Was this the original issue with the set?

If you connect up a DVD player and slowly cycle the INPUT button does the sound come through?

Anthony

Anthony

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Customer reply replied 2 years ago
I put a movie on my computer and plugged in the hdmi hitting the input button twice every 30 sec or so
TV Technician: Anthony_Infotech, Technician replied 2 years ago

And this was the original issue with the set

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Customer reply replied 2 years ago
it lost everything but the green light
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Set is running there may be a voltage rail down if you have no sound but you replaced power and main same symptoms, are you sure there is no backlight?no visible signs of light even in a dark room because from what you are saying and if this has stayed the same symptom throughout it does not make sense

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Customer reply replied 2 years ago
No backlight maybe i should try hooking up something other than my comp
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Yes you can do that but you see you have replaced the power-board which eliminates any missing voltages for the no sound and no backlight condition and in addition the mainboard too so there is something odd if you have done that, I am not sure if this set uses a backlight inverter or 2 (cant find the data on it in my database yet) or if its an LED backlight?if its LED this is usually a lead from the powerboard that disappears into the panel

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Customer reply replied 2 years ago
It has 4 backlight inverter boards two master and two slave the masters were burnt through i have not replaced the slave boards yet trying to get sound first
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Processing for the sound will be on the main-board I suggest you try another input like a DVD player as there may be a comms problem with the computer, let meknow

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Yes there should be sound here regardless if the master/slaves are working or not

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Customer reply replied 2 years ago
I just hooked up a vhs need to cycle through inputs
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Then you would be looking to replace the slaves if the sound returns

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

And you also have to hope that the backlights themselves have not been damaged

Anthony

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Customer reply replied 2 years ago
Cant seem to find any sound maybe i got a bad power board from ebay
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Use a meter to check the voltages they should be stamped on the board

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Its possible but to show the same issue seems improbable

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Same thing could be said about the main-board but is improbable.......this is odd

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

I do hope you know the history of the set?the set has not been subject to storm damage?

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Customer reply replied 2 years ago
I bought it new its 6 yrs old
TV Technician: Anthony_Infotech, Technician replied 2 years ago

OK I would suggest you send back both main and power and perform the test again when boards arrive, i do not use ebay only as a last resort best using suppliers like www.shopjimmy.com

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Please make sure you have provided the correct model number for the set re-check thanks

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Customer reply replied 2 years ago
Shop jimmy didnt have power board unfortunately i got the main board from them yesterday
Customer reply replied 2 years ago
there are no other boards i need for sound but main and power?
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Is the model definitely what you said?you have checked

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

I am 90% sure will check now, there is no terminal board for the INPUT connections?

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Customer reply replied 2 years ago
They are on main board
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Yes its just if there was a separate board but all processing for the signal for the sound comes from main, power to main and maybe sound output from power-board, it really just leaves the speakers have you checked those?

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Customer reply replied 2 years ago
No ill have to get a differant tester and go over the power i know im getting 5v to the inverter standby and 117 coming in thats all ive been able to check
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Just check the speakers on ohms they should read about 8 ohms if not they are open circuit, read across terminals

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Customer reply replied 2 years ago
Ok
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Its the only thing left to check for the no sound issue

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Customer reply replied 2 years ago
Damn i got 0
TV Technician: Anthony_Infotech, Technician replied 2 years ago

If the meter is swinging to near 0 ohms then although that is not correct its safe to say the speakers are working, its only if there is nothing happening with the meter and it reads OL

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Customer reply replied 2 years ago
Rechecked with big tester they're good
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Back to plan A with replacing main and power, you do see the speaker leads going into the mainboard?if so then its still plan A

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Customer reply replied 2 years ago
i got the main from jimmy do they sell refurbished or new
TV Technician: Anthony_Infotech, Technician replied 2 years ago

No you will find all boards from any supplier will be pulled from scrap sets

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Boards new if available would be too costly

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Customer reply replied 2 years ago
Ok ill give them a call, thanks for your help
TV Technician: Anthony_Infotech, Technician replied 2 years ago

Ok let me know how it works out this has to be either that main or powerboard you got

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Please consider rating the answer positively there will be a rating bar of stars usually at the top of the page with this post thank you, ***** ***** positively enables me to receive credit from the site thanks again, the session will remain open and stay open as long as you need it, if you have any concerns please just let me know and I will answer any queries you have

Many Thanks

Anthony

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TV Technician: Anthony_Infotech, Technician replied 2 years ago

Do you still need help with this please

Anthony

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