Sharp LC40LE531E Red/Green flashing LED

[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

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

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

[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 ?????

[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

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

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

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 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

[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

[budm]

Re: Sharp LC40LE531E Red/Green flashing LED

https://www.badcaps.net/forum/attach...0&d=1610474573

What DC Voltage do you get on U3 Middle pin (big tab) with ref. to the negative leg one of 220uf 35V cap (the two caps are connected in parallel so you can use any one of the two caps)?

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Sorry, Sorry.
Crazy mistake on my part.
Pin7 is not VCC for LED 3 & 4.
Pin5 is VCC for pins 6 & 7

I will recheck all tomorrow when I'm not so tired.

Sincere thanks for your help

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

No there is no typo. The voltage on P6-P7 is low in both states.

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

as end.. CN3, seem the first group blue pin1 to white & black okay

the second group blue pin 5 to white okay.. and to black pin 7 had open LED

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

I remeasured everything. It looks like there is a problem with the Pin 6 measurement. The connector to the LED strings was connected during these readings.

Standby
Pin-1 VCC
Pin-2 V between P1 & P2 0.884v
Pin-3 V between P1 & P3 0.836v
Pin-4 No Connection
Pin-5 V between P7 & P5 0.543v
Pin-6 V between P7 & P6 0.010v
Pin-7 VCC


On
Pin-1 VCC
Pin-2 V between P1 & P2 10.55v
Pin-3 V between P1 & P3 10.24v
Pin-4 No Connection
Pin-5 V between P7 & P5 10.02v
Pin-6 V between P7 & P6 0.020v
Pin-7 VCC

are there typo ??
the one i remark it with red color ... you mean between pin7 LED 4 and Pin 5 VCC correct?

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

I remeasured everything. It looks like there is a problem with the Pin 6 measurement. The connector to the LED strings was connected during these readings.

Standby
Pin-1 VCC
Pin-2 V between P1 & P2 0.884v
Pin-3 V between P1 & P3 0.836v
Pin-4 No Connection
Pin-5 V between P7 & P5 0.543v
Pin-6 V between P7 & P6 0.010v
Pin-7 VCC


On
Pin-1 VCC
Pin-2 V between P1 & P2 10.55v
Pin-3 V between P1 & P3 10.24v
Pin-4 No Connection
Pin-5 V between P7 & P5 10.02v
Pin-6 V between P7 & P6 0.020v
Pin-7 VCC

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

yes of course its same.. so mean all the voltage you posted at your POST#7 after you press power on the side panel of the tv...?

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Hi,

The TV is face down on the bench and to disconnect from the AC outlet I have been pulling out the Live+Neutral connection from the power board.

I have not been using the remote control, rather the push buttons on the lower edge of the TV bezel to take it out of standby.

Is this not achieving the same results?

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

If I measure CN3 pin 5 VCC to pin 6 and pin 7 I read the same 10.5v
This measurement is taken when the front LED is blinking red/green.

If i disconnect the TV from the wall supply - then reconnect, the front LED goes solid red.
If I measure CN3 in this state these are the readings:

1. VCC
2. LED1 (pin1 to pin2 = 1.75v)
3. LED2 (pin1 to pin3 = 1.76v)
4. NC
5. VCC
6. LED3 (pin5 to pin6 = 1.8v)
7. LED4 (pin5 to pin7 = 1.68v)

CN2 Connects to the T-Con board.

Measuring CN1 pin12 with reference to ground:
In standby 0.413v
In 'on' 0.013v (using a Fluke 187 it does not appear to jump over 2v)

then do both test you mentioned again but you need to turn on the set with RC at time the front LED goes solid red

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Understood. Many thanks.