Sharp LC40LE531E Red/Green flashing LED

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

With regard to the U3 Mosfet the readings with reference to ground on the 220uF/35V cap:

(this in powered on mode with the front LED pulsing Red/Green)

Drain 0.035V
Gate 24.15v
Source 24.19

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

I remeasured everything on CN3 with the LED strings connected in standby and ON modes.

Standby
Pin-1 VCC
Pin-2 V between P1 & P2 1.672v
Pin-3 V between P1 & P3 1.187v
Pin-4 No Connection
Pin-5 VCC
Pin-6 V between P5 & P6 1.745v
Pin-7 V between P5 & P7 1.685v

ON
Pin-1 VCC
Pin-2 V between P1 & P2 10.52v
Pin-3 V between P1 & P3 10.36v
Pin-4 No Connection
Pin-5 VCC
Pin-6 V between P5 & P6 10.32v
Pin-7 V between P5 & P7 10.48v

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

look good.
try to disconnect the screen totally from the T-CON ( disconnect the ribbon cable from t_CON side ) and see did the set come on or the BL turn on ?
show me please photo on yours Main boards and T-CON

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

I disconnected the T-Con board and power on but there was no change. The LED arrays did not light (they remained at approx 10.5V)

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

Man--- i wrote at my post #23 to disconnect the screen ( panel ) from T-CON ( ribbon cable are the 2 flat one connected between T-CON and panel )... also the T-CON should be stay in place and it connected to the LED inverter and to the main boards via 2 LVDS cable

BTW. the LVDS cable are not plugged good at the main boards... you should let them in place.

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Please forgive my ignorance.

When you said to disconnect the T-Con board, I assumed that was disconnecting it from the digital and inverter boards.

Do you want me to reconnect these connectors and disconnect the lower ribbon cables?

EDIT: I have reseated the T-Con connectors on the logic board.
I disconnected the ribbon cables from the bottom of the TCon board.

No change going from standby to On

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

Please forgive my ignorance.

When you said to disconnect the T-Con board, I assumed that was disconnecting it from the digital and inverter boards.

Do you want me to reconnect these connectors and disconnect the lower ribbon cables?

EDIT: I have reseated the T-Con connectors on the logic board.
I disconnected the ribbon cables from the bottom of the TCon board.

No change going from standby to On

did you saw the photo of the main boards i made remark on it ?????

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

i think your issue fault at firmware bootloader section.. as your main boards Vestel 17Mb70.

you need to know which type of panel you have ... in case its LG panel.. then use this file.. extract the zip and put all 3 file
1- mb60_en.bin
2- mboot.bin
3- usb_auto_update_T4.txt
on USB stick formatted fat32 better stick not bigger than 2Gb , insert the stick at tv and try first press P+ on the remote ...keep pressing then turn on the set.. if P+ didn't work then try press OK on RC

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Thank you.

It's an Samsung screen I think:



https://www.badcaps.net/forum/attach...1&d=1610654324

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

Thank you.

on the mainboard under the cover CI decoder socket ( where there yellow label TEST OKAY ) if you remove the cover you will have the boards label printed .. upload photo of it. )

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

This the right ID label?

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

okay thanks... forget my bootloader file... yours set bootloader 100% okay...
you have BGA issue

take the mainboards out side and heat it very well with hot air gun specially under side where the black heatsink covered cpu and other 2 chips. leave it cool down and then put it in place

EDIT:

it could be main firmware too... i have many with LG panel driver ( medion sets) either modified firmware too and autorun.sh

at end here are documentation service manual and schematic to this boards.

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

for record.. there are procedure using UART to know where are the BGA exactly as this set Linux and we can communicated with it via UART. USB TTL 5.V and the UART pins are at the scart sockets
Scart Pin 10 - RX
Scart Pin 12 - TX
Scart Pin 14 - GND

terminal setting
Baud-Rate:115200
Bits: 8
Stop-Bits : 1
Parity : None
Handshake: No

[budm]

Re: Sharp LC40LE531E Red/Green flashing LED

So at this point the ENA (BL-ON) is still staying at <1V, correct?

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

I removed the main digital board and heated the large BGA chips for a few minutes - then let them cool and reassembled.

I now only have the red standby and it will not turn on as it did before...

Have I fully broken it now?

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

I removed the main digital board and heated the large BGA chips for a few minutes - then let them cool and reassembled.

I now only have the red standby and it will not turn on as it did before...

Have I fully broken it now?

no you didnt... the BGA still there.. do it again and search for firmware for yours mainboards 17MB70-5P with samsung panel driver..

by the way yesterday i did extract the bootloader i posted before its dosnt contained any driver... the driver of panel and audio and video are located at main firmware which you need to search for... so its safe if you flash the bootloader i attached before.

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

what are you doing LOL ... bad idea.. because if there SMT parts at bottom side of the boards all will fill down... !!!!!!

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

...this TV has driven me crazy!!!
Anyhow after my (bad) light bulb trick it it now as it was before.
So solid red with power, then red/green flash on front panel button press...

Re re-flashing firmware how about this?

http://gofirmware.com/content/17mb70-5p-firmware

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

...this TV has driven me crazy!!!
Anyhow after my (bad) light bulb trick it it now as it was before.
So solid red with power, then red/green flash on front panel button press...

Re re-flashing firmware how about this?

download this firmware its for samsung panel