Sharp LC40LE531E Red/Green flashing LED

[dick_barton]

Re: Sharp LC40LE531E Red/Green flashing LED

Sorry. I initially replied with a comment but then noticed after posting that I had made a mistake. Once posted there is no way to delete the posting other than to blank it.

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Hi Dick,

I can't read any text in your 1:43 #8 posting.

[dick_barton]

Re: Sharp LC40LE531E Red/Green flashing LED

.

[Nevillet]

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)

[budm]

Re: Sharp LC40LE531E Red/Green flashing LED

12. 0.013v
Pin 12 is ENA (BL-ON pin), <1V = Backlights OFF, > 2 ~ 2.5V = Backlights on
TV is off, Put black probe on the chassis, red probe on PIN 12 (ENA = BL-ON), turn on the TV while watching the meter to see if it jumps up over 2VDC or not.

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

Fuse F1 is good.

I have rechecked what I listed for CN1 and i'm correct with the population of pins in the connector.

With CN3, the connector to the LED strings I think I measured as you requested.
As you look at the connector, with arrow on the right I used that as my + red reference That is pin1.

1. VCC (+reference)
2. LED1 10.50V
3. LED2 10.56V
4. NC
5. VCC 0.0V
6. LED3 10.58V
7. LED4 10.55

..and the 2 electrolytics are fine ESR/capacitance wise

CN3 pin 5 VCC , you need to use it as references to measure led 3 &4.
i forget to mention this test of CN3 you need to put the probe on the test point then plug the set in wall socket to remark the high and low reading at each pins.

i dont think the issue at inverter.. you have CN2 which i think its connected to the T-CON correct ?

[Nevillet]

Re: Sharp LC40LE531E Red/Green flashing LED

Fuse F1 is good.

I have rechecked what I listed for CN1 and i'm correct with the population of pins in the connector.

With CN3, the connector to the LED strings I think I measured as you requested.
As you look at the connector, with arrow on the right I used that as my + red reference That is pin1.

1. VCC (+reference)
2. LED1 10.50V
3. LED2 10.56V
4. NC
5. VCC 0.0V
6. LED3 10.58V
7. LED4 10.55

..and the 2 electrolytics are fine ESR/capacitance wise

[Diah]

Re: Sharp LC40LE531E Red/Green flashing LED

your reading of the voltage on CN1 look not correct with pins NO
you have pins 1-5 24V and from 6-10 GND , pin 11 are error out you wrote N/C

second read the voltage on CN3 between VCC Pin1(red probe ) and led 1 & 2, same to the next VCC pin5 and led 3 & 4

[dick_barton]

Re: Sharp LC40LE531E Red/Green flashing LED

Do you have 24V on each side of the fuse F1?

[Nevillet]

Hi,

I have the above TV which will not turn on. I understand the flash code is pointing to a faulty inverter board:



The main connector on the bottom connector has the following readings when the LED is blinking Red/Green (from left to right)

1. 24v
2. 24v
3. 24v
4. 24v
5. N/C
6. GND
7. GND
8. GND
9. N/C
10. N/C
11. N/C
12. 0.013v
13. 3.3v
14. N/C

any ideas where to start?

Thanks in advance.