KD-60X690E 2 Blinks

[Plurxtc1]

I got an issue with 2 blinks on model KD-60X690E. Does anyone have the service manual?

[Hamie]

Re: KD-60X690E 2 Blinks

2 blinks is usually a power supply fault.

[dick_barton]

Re: KD-60X690E 2 Blinks

You need to give the voltage readings on the connectors as shown on the pcb

[Plurxtc1]

Re: KD-60X690E 2 Blinks

I replaced the main board and it fixed it. It was really odd because the service manual said it was the power supply

[petersanchen]

Re: KD-60X690E 2 Blinks

HI I have the same problem with 2 blinks on model KD-60X690E. Does anyone have the power board schematic. no power to black light led. led ok

[dick_barton]

Re: KD-60X690E 2 Blinks

What voltage do you have at BL_ON at connector CN200

Do you have all the other supplies 5V and 12.7V

What voltage do you have on the pins of CN306 as you power up. The voltage may shoot up and drop just as quickly.

[Plurxtc1]

Re: KD-60X690E 2 Blinks

What voltage do you have at BL_ON at connector CN200

Do you have all the other supplies 5V and 12.7V

What voltage do you have on the pins of CN306 as you power up. The voltage may shoot up and drop just as quickly.

Too late, I already sent it out to my client months ago. Main board replacement fixed it.

[dick_barton]

Re: KD-60X690E 2 Blinks

Too late, I already sent it out to my client months ago. Main board replacement fixed it.

Hi
My answer was to petersanchen who has a similar fault to yours

[RJARRRPCGP]

Re: KD-60X690E 2 Blinks

This model, most likely has a wide-spread problem with the main board!

In 2018, my sister received one and it was unusable, according to her. It was broken when it was brand new, in our eyes!

[petersanchen]

Re: KD-60X690E 2 Blinks

Hi dick_barton Thank You for the quick reply. I have 5 volts standby on Cn201. Everything else did not have voltage; even the Acd on the set. I bypassed standby votage to Ps on and T/con on and Bl on with jumper wirers. Then I got 12 volts on T con Cn200 and all the 12 volt on Cn201. No voltage on Cn300 for back light and I have power on C306, C304 and C303 CAP. So what should be the volatage on ACd?

[dick_barton]

Re: KD-60X690E 2 Blinks

If you are testing the power supply them disconnect it from the mainboard. Use a 1K resistor and connect between the 5V standby and PS_On and a second 1K resistor between 5V standby and BL_On and see if the backlights come up

No voltage on Cn300 for back light and I have power on C306, C304 and C303 CAP. So what should be the volatage on ACd?

What voltage on C306, C304, C303 ?

[petersanchen]

Re: KD-60X690E 2 Blinks

i have 118dc on my meter. but nothing on cn300

[dick_barton]

Re: KD-60X690E 2 Blinks

What's the voltage rating on those 3 capacitors.
What was the result of the test suggested in post #11

[dick_barton]

Re: KD-60X690E 2 Blinks

Also

I see that the positive connection of those 3 capacitors connect to CN300 so I don't understand why you say you have no voltage at CN300

The backlight is made up of 10 strips (5 type A and 5 Type B) each having 5 leds per strip so a total of 50 leds
If the leds are 3V type then the 155V @ 0.5A as written on the power supply would indicate they are all connected in series (50 * 3.1V = 155V)

The 118V that you measure would seem to indicate that the BL_ON has not been activated to boost the supply up to the required 155V
or that you have an issue around the led driver or an led fault.

[Diah]

Re: KD-60X690E 2 Blinks

i would suggest first remove load from the main boards and turn it on to see the 2 blinks remain 2 or more or it cleared.. for example remove the Tuner socket .... disconnect WiFi module. also disconnect the LVDS between main boards & T-CON ..

[petersanchen]

Re: KD-60X690E 2 Blinks

the cn300 is control by q301 on the ground side i dont have gate volt on q301 118v is low I will check on that supply tonight. i need schematic. do you know where can i buy or download it.

[dick_barton]

Re: KD-60X690E 2 Blinks

There could be no gate voltage for a number of reasons.
Faulty mosfet, faulty led driver IC, or led driver IC not enabled ie no BL_On asserted.

[petersanchen]

Re: KD-60X690E 2 Blinks

I got a main board from ebay fixed the problem nothing wrong with the power board

[dick_barton]

Re: KD-60X690E 2 Blinks

Well you got there in the end which is good.
I wonder if your original main board was not sending the backlight enable signal to the backlight control / led driver circuit.