Sharp LC-60LE741E 3 Blinks

[london-freddie]

Hi Guys
Just bought cheap this Sharp LC-60LE741E, seller said can not get it out of standby
Got it home plugged it in and it powered up, however after maybe 2 minutes it powered off itself and has not come back on since.
When powering on white led at bottom centre comes on steady for about two minutes (nothing on screen) then goes off, White led then comes back on flashing three times
I can not find what this flashing code is, all I am finding is 1 quick flash then 2 short flashes, Mine is 3 flashes all same length
Did find a reset involving think it was volume down and input held whils plugging in but that had no effect
Only thing I have checked up to now is for 5V standby on powerboard which is there.
My first thought is powerboard but maybe it is the mainboard
When tv did first power up picture seemed good for the short time it was on
Any ideas please as to what these 3 flashes are telling me
thanks

[nomoresonys]

Re: Sharp LC-60LE741E 3 Blinks

Try it while holding input and channel down, see if that works.

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

Hi
Thanks for that Input and channel down, No effect

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

I am struggling at the moment to check powerboard Vs, but looks like I have no 12v at pins 1 and 2 on PD

[nomoresonys]

Re: Sharp LC-60LE741E 3 Blinks

Do you have backlights? If not (with tv unplugged) unplug cable from powerboard to mainboard, plug tv back in, see if they come on.

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

No backlights come on with powerboard to mainboard cable unplugged
Does not a BL on signal from mainboard to powerboard tell the powerboard to turn on the backlights, or am I wrong

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

I have been trying to follow a youtube video SHARP AQUOS TV "LC-60LE650U" flashes 3 slow, 1 fast. No back light or sound. Here's the fix. by Ray S
On checking my regulator, mine is a slightly different board I also have no 12v coming out from the regulator, this 12v seems to go to pins 1 and 2 on the PD connector but I also have no turn on volts at the regulator.
Am I on the wrong track here ??

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

underside of powerboard Q7120 I believe is the 12v regulator

[budm]

Re: Sharp LC-60LE741E 3 Blinks

You need to report what Voltages you have on the power supply connector that goes to the main board so we can see what it has or does not have when TV is off and when power switch is activated, that will be the starting point.

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

Hi will do budm asap, was struggling to get readings from top of the board, will have to try from the bottom but keeping all connected, I will do it

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

Anyone know yet what the 3 flashes mean on this set

[budm]

Re: Sharp LC-60LE741E 3 Blinks

https://www.badcaps.net/forum/attach...6&d=1561560221
BTW, what is the board P/N as printed on the board and on the bar code stickers?
You can probe the connector from the wire entrance side using skinny probe tip.

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

Ok budm got what you want
PIN
1 PNL12v 0V
2 PNL12V 0V
3 GND
4 GND
5,6,7,8 UR13.2 13.23v
9,10,11,12 GND
13 AC_DET 3.35V
14 PS_ON 2.87V
15 BU5V 5.09V
16 PNL_POW 0.2v
17 PWM1 0v
18 NC
19 DIMMER 0v
20 NC
21 OFL 0.2v
22 ERROR 0v
23PWM2 0v
24 STB 0v

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

Board number is

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

417V on Main caps

[budm]

Re: Sharp LC-60LE741E 3 Blinks

Ok budm got what you want
PIN
1 PNL12v 0V: No output because PIN 16 PNL_POW is not present
2 PNL12V 0V
3 GND
4 GND
5,6,7,8 UR13.2 13.23v
9,10,11,12 GND
13 AC_DET 3.35V
14 PS_ON 2.87V
15 BU5V 5.09V
16 PNL_POW 0.2v Bad, should be 3 ~ 4 VDC from main board
17 PWM1 0v: Bad
18 NC
19 DIMMER 0v: Bad (this analog Dimming may not be used)
20 NC
21 OFL 0.2v
22 ERROR 0v
23PWM2 0v: Bad
24 STB 0v: Bad, this is the BL-ON signal, should be 3 ~ 4 Vdc.

So something is going on with the main board or something is locking out that causes it not to send out some of the command signals.

[budm]

Re: Sharp LC-60LE741E 3 Blinks

417V on Main caps

This is quite high, it should be around 380 ~ to 400V at the most.
Meter is OK?

[nomoresonys]

Re: Sharp LC-60LE741E 3 Blinks

Do you have standby voltage with cable from powerboard to mainboard unplugged?

[london-freddie]

Re: Sharp LC-60LE741E 3 Blinks

Just rechecked main caps yes 417v as far as I am aware meter is ok
are we talking standby voltage at pin 24 ?

[budm]

Re: Sharp LC-60LE741E 3 Blinks

Just rechecked main caps yes 417v as far as I am aware meter is ok
are we talking standby voltage at pin 24 ?

As indicated in my post #16; The STB pin is BL-ON.
BU5V pins are the standby power supply pins.