Sony KD49X8005C Assistance Required Please.

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

be aware always. LED testing with just they turn on not enough. as each led had build in diode opposite to the LED light to limited the current. so led turn on but the diode shorted or some time open too

Thank you, I will add this information to my notebook for the future.

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

I Test the LED+ from the socket with plug disconnected, at power up 93.44v
And LED- 0.23v
I'm not sure I have taken the correct measurements you wanted.

again wrong.. from now on never never disconnected the LED socket from PSU. until you see all strips turn on when tv power on...
also read the value again on the socket you have only 2 pin - and + this you need to read

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

again wrong.. from now on never never disconnected the LED socket from PSU. until you see all strips turn on when tv power on...
also read the value again

Ok . Another note for my book. Thanks

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

LED+ 93.4v - 95.3v
LED- 13.8v - 15.3v

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

why you put the - on chassis ? leave the - on - and + on +
just read direct from the socket

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

I'm getting 1.6v to 0.14v
Is this correct?
I tested a few times with similar results.
The 1.6v is just for a fraction of a second, then it settles down to 0.14v

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

no... you have one raw flash on... lol... how it come 1.6.....start testing put your voltmeter on Diode Option. and start test diode LED you can make references from reading value of working one each test should be in tow opposite direction of - +

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

I have tested all of the LEDs with the meter in diode mode.
All LEDs test from 2.53v to 2.51v.
All LEDs have OL with leads reversed.

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

I have tested all of the LEDs with the meter in diode mode.
All LEDs test from 2.53v to 2.51v.
All LEDs have OL with leads reversed.

????? test as diode not volts.... tv must be off .. show me how you test with yours DM

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

any one from English speaker counties please help him to test which LED fault.

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

????? test as diode not volts.... tv must be off .. show me how you test with yours DM

I will take some pictures of how I am testing LEDs. And upload in a few minutes.
Sorry if I am doing this wrong.

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

The first picture is with the Black probe on the negative rail and the Red probe on the first test point after the first LED.
With the meter on Diode mode, I get a reading of 2.515v.
This LED lights up.
When I reverse the leads, the meter shows OL
The 3rd picture shows testing the second and all other LED on this string.#
I place the Black lead on the test point before the LED and the Red probe on the test point after the LED.
The meter shows 2.525v
This LED lights up.
When I reverse the leads the meter shows OL.
All LEDs are about the same value.
I'm so sorry if I have misunderstood your instructions.

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

The first picture is with the Black probe on the negative rail and the Red probe on the first test point after the first LED.
With the meter on Diode mode, I get a reading of 2.515v.
This LED lights up.
When I reverse the leads, the meter shows OL
The 3rd picture shows testing the second and all other LED on this string.#
I place the Black lead on the test point before the LED and the Red probe on the test point after the LED.
The meter shows 2.525v
This LED lights up.
When I reverse the leads the meter shows OL.
All LEDs are about the same value.
I'm so sorry if I have misunderstood your instructions.

this test you mentioned above only on the string which flash on at start up right ?

if yes do the same to all other string led

if not the one string we talk on which it flash once at start up wrote here its not

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

I have tested ALL LEDs on ALL the strings, and the test results are almost the same.
There is only 0.01v of a difference between ALL the LEDs.

Just for future reference, Were you expecting to see at least one of the LEDs with a different reading from all the others?

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

I have tested ALL LEDs on ALL the strings, and the test results are almost the same.
There is only 0.01v of a difference between ALL the LEDs.

Just for future reference, Were you expecting to see at least one of the LEDs with a different reading from all the others?

however. please inspect and re solder all joint point of string and socket.. dpnt left any with out resold them

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

however. please inspect and re solder all joint point of string and socket.. dpnt left any with out resold them

Ok, I will re-solder all connections, and re-test again Tomorrow, I'm getting pretty tired, and I don't want to make a mistake.
Thank you for your patience, and assistance, I really appreciate everyone's help.

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

i am off.. i don't believe on yours DM . if you have the easy one of diode test option with beep tone you had found the fault led.. please other help.. i keep my eyes on this post

[Diah]

Re: Sony KD49X8005C Assistance Required Please.

i am off.. i don't believe on yours DM . if you have the easy one of diode test option with beep tone you had found the fault led..

TV LED BL test should be as following
when the DM on Diode mode when you put the probe and the LED light on, the DM as my will read nothings. then reserve the probe the DM will read value as ziner Diode between .650 -.756
if the DM peep ton or read less than .500 mean this ziner shorted , if the DM no peep or no value read it mean its OPEN. and both above state are fault which make this err.

[zomi]

Re: Sony KD49X8005C Assistance Required Please.

All the wire connectors solder these direct
either new wire or just snip the plugs off and solder

i have circled them for you

[Stevie406]

Re: Sony KD49X8005C Assistance Required Please.

All the wire connectors solder these direct
either new wire or just snip the plugs off and solder

i have circled them for you

Ok. 10 Minutes and it will be done.
Thank you..