TV Sharp AQUOS LC-60LE635E TV not power ON

[markolino]

Hi. Am new in this forum

A have Sharp AQUOS model: LC-60LE635E
And my tv not start on.
today i replaced the power board with a working one. The problem still remains.
if you could help me i would be very grateful
i think it's a flaw on the main board
here's my video
https://youtu.be/juAvTriU-ms

Best regards.

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

no one knows? how could he help me?

[pier12]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

Look at this...

[pier12]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

and this.....

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

Thanks for the service manual but I already knew that ...
According to this book, it is a power board failure,
but I switched the power panel to another that worked on the previous TV 100%
Anyone have any idea ??
Not in the forum repairers etc?
Thanks.

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

Update my blink error light
A have 2 long and 5 short blink.
Look video

https://youtu.be/WgiJ3UZ_D2g

[R_J]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

disconnect one of the flat cables between the T-con board and the lcd panel, Does the tv turn on and give half screen? If not, reconnect the cable and disconnect the other cable and try again. If the tv stays on you have a panel problem.

According to this book, it is a power board failure

No the book says "Panel Power supply error" In this case the Panel likely has a short killing the panel supply voltage FROM the power supply

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

disconnect one of the flat cables between the T-con board and the lcd panel, Does the tv turn on and give half screen? If not, reconnect the cable and disconnect the other cable and try again. If the tv stays on you have a panel problem.
No the book says "Panel Power supply error" In this case the Panel likely has a short killing the panel supply voltage FROM the power supply

here's a try on your theory a little earlier.
first disconnected one flat cable.
error equals black screen light flashing. 2 slow 5x short
then i plugged the flat cable back in and unplugged the next, same error black screen light flashes....
so the led panel is ok?

[budm]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

What Voltage measurement have you done on the connectors of the power supply board?
Upload the pictures of the boards using attachment for us to look at.

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

ok.
i measured the voltages on the pins.
so if I disconnect the panel from the main panel and measure it on the table.
i get on pin 15 / 5V
when i make contact with pin 15 and pin 14 (BU5V to PS-ON)
i get on pin 5,6,7,8 12.95V almost pure 13V
i don't get 12V on pin 1.2.
if i plug the power board back into the tv and plug in the main board, i get 12v on pin 1.2 but hold the current until the light starts blinking then i have no more voltage on pin 1.2

but some more
on the LED light connector
1,2,3,4 ice here I get no tension not when I have a board on the table or when it is mounted on a tv

[budm]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

You need to report the Voltage readings (ALL CABLES IN PLACE) for each pin (except GND) of the PD connector when TV is off and when power switch is activated:
TV OFF:
Pin 1, 2 PNL12V = xxx V
Pin 5, 6, 7, 8 UR13V = xxx V
............

Power switch activated:
TV OFF:
Pin 1, 2 PNL12V = xxx V
Pin 5, 6, 7, 8 UR13V = xxx V
............

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

Ok Budm.
when i plug the tv into electricity the light starts to go on immediately.
after a few seconds the light blinks.
the measurement results are

PIN 1, 2 PNL12V = 0V
PIN 5, 6, 7, 8 UR13V = 12.95V
that's it

[R_J]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

So you are saying you have 0 volts on pin 16 as well? Then there is your problem.

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

pin 16? I didn't measure it or ??
since Mr Budim told me to only measure pin 1 2 and 5 6 7 8

[R_J]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

Pin 16 is..PNL_POW, this stands for PaNeL POWer, and is the line that turns the PNL12V (PD-1,2) on and off. I suspect it should be about the same voltage as the PS-ON (3.3~5v)

If you have the voltgae on PD, pin 16 I suspect you could have a bad Q7120 regulator ic, This is a 12 volt regulator ic with on/off I have seen this before

[budwich]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

pin 16? I didn't measure it or ??
since Mr Budim told me to only measure pin 1 2 and 5 6 7 8

budm was just showing you an example of how you should report your testing.... he said to measure / test ALL pins on the PD connector.

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

now i will measure all the pins once
but I tried the Q7120 warmed up with a hairdryer just like one tried on youtube and it didn't connect the tension

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

ok now i measured the voltage a little more carefully.
when i turn on the tv in 220v
the first 5 seconds I have a voltage on the following pins like this

PIN 1, 2 PNL12V = 12V
PIN 3 = 0V GND
PIN 4 = 0V GND
PIN 5 =12,89V
PIN 6 =12,89V
PIN 7 =12,89V
PIN 8 =12,89V
PIN 9 =0V GND
PIN 10 =0V GND
PIN 11 =0V GND
PIN 12 =0V GND
PIN 13 AC-DET = 3,33V
PIN 14 PS-ON = 2,86V
PIN 15 BU5V = 5,05V
PIN 16 PNL-POW = 3.30V
PIN 17 = 0V
PIN 18 = 0,40V
PIN 19 DIMMER = 0V
PIN 20 = 0,45V
PIN 21 OFL = 0V
PIN 22 ERROR = 0V
PIN 23 = 0V
PIN 24 STB = 0V

here are the results of measuring the first 5 seconds when I plug the cable into the electricity. (Main board conectet whit power board)!
after 5 seconds i have voltage only on PIN 15 / BU5V = 5V
that's it

[R_J]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

Based on what you are saying, I suspect you have a fault with the main board, because you have the standby (BU5V) but you do not have the PS-ON to turn ON the power supply. If there is a large BGA ic on the main board I suspect that could be the problem, try heating the ic and see if it stays on longer

[markolino]

Re: TV Sharp AQUOS LC-60LE635E TV not power ON

i tried going with the hair dryer main chip on the main board but the thing is identical
here's a video of what it looks like when the voltage drops
https://youtu.be/huzyFnhFcis