Re: Hisense LCD39V77PK Blue led directly no sound no picture
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Re: Hisense LCD39V77PK Blue led directly no sound no picture
MST6E181VS-LF-Z1
Do the TV will directly operate the power board if i took up the SPI flash out of the board?
I think if the SPI flash is the concern it should keep on the standby mode no 5 v power signal go to the power board with all same symptoms (no picture, no sound, no response to buttons or remote control).
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Re: Hisense LCD39V77PK Blue led directly no sound no picture
i have done the above process but with no hope same blue led.
is there a possibility that the controller main IC is dead, i found replacement for this IC on Chinese aliexpress site, if i replaced it would it be effective if it was the reason?
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Re: Hisense LCD39V77PK Blue led directly no sound no picture
Yes already checked both are same type PNP (H1A code).
[ATTACH]196088[/ATTACH]
Yes as you said they are both connected directly to the PWR signal for the PWR board but from where they take the 5 v signal to pass for the power board?
Does it comes from the main IC?
[ATTACH]196089[/ATTACH]Re: Hisense LCD39V77PK Blue led directly no sound no picture
Yes already checked both are same type PNP (H1A code).
[ATTACH]196088[/ATTACH]
Yes as you said they are both connected...
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Re: Hisense LCD39V77PK Blue led directly no sound no picture
Thank you for your support
SPI flash no MX25L3206E 4 MB flash
But actually i am not suspecting the Flash IC because if it is removed it must bring back the LCD to Standby status with the Red LED lit not the blue led and then the LCD will not respond to remote or fixed buttons.
However the condition also after removing the flash SPI out of the board same issue blue led with power board on for all voltage as if i opened the TV from power button.
N.B.
I have removed the SPI...
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Re: Hisense LCD39V77PK Blue led directly no sound no picture
This is the whole back
[ATTACH]196073[/ATTACH]
This is the main board
[ATTACH]196074[/ATTACH]
This is the power board
[ATTACH]196075[/ATTACH]
power board voltage distribution
[ATTACH]196076[/ATTACH]
connecting only 5 v (standby voltage) to main board
[ATTACH]196077[/ATTACH]
measuring pwr switch (pwr signal) pin from main board to power board
[ATTACH]196078[/ATTACH]
IC which have been replaced and disassembled
[ATTACH]196084[/ATTACH]...
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Hisense LCD39V77PK Blue led directly no sound no picture
A Hisense 39 inch model: LCD39V77PK glowing with blue led directly after connecting to power source (no standby red led) and no sound or picture appears with no response to buttons or remote control!!
[LIST][/LIST]i checked the power board voltage all of them were Ok. also i checked the control board voltage all of them exist but the flash IC voltage was 4.3 v not 3.3 v so i replaced the voltage regulator with same # and the voltage back to 3.3 v but same issue.[LIST][/LIST]i reflashed the flash IC with same model software but same issue.
i checked power signal (5 v) from control...
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Re: New Members - please post your introductions here
Hi everyone.
My name is Hesham, I am crazy about electronics a lot. i luv repairing all electronic devices as it looks like you are solving a puzzle.
I found this site and it looks pretty good for me and my goals. Thank you for let me in. I will try to share all my knowledge with you.
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