PHILIPS 75PUS7805/12 BLACK SCREEN

**Diah** · 2025-11-23T09:50:24+00:00

before you put all together,, test the LED which didnt come on. if there zener diode build inside the LED are open or short... with yours DM in diode mode you will se one one way lit dim and at reverse will read diode.. in case there are zener protection built in

**bohaboha** · 2025-11-23T13:03:07+00:00

Originally posted by Diah

before you put all together,, test the LED which didnt come on. if there zener diode build inside the LED are open or short... with yours DM in diode mode you will se one one way lit dim and at reverse will read diode.. in case there are zener protection built in

the 2 LEDs that did not come on both read 2.500v and dim and both OL in Reverse. so it looks that there is no zener build inside them. did you read post60? and what do you think about the behave of the TV set

**lotas** · 2025-11-23T13:15:26+00:00

Why are you supplying power (voltage) inside the power supply (to the output of the LED drivers)? You can burn out the LED driver itself this way. If you haven't already, you should always disconnect the connector from the power supply and supply power from the tester to the backlight wires!

Attached Files

if you find these attachements useful please consider making a small donation to the site

**Diah** · 2025-11-23T13:21:27+00:00

regards to yours POST #60 you still have the old strips. use good one to replace the strips with LED off, and power on the TV let see if there any change.... other wise you have fault strips delivered

**bohaboha** · 2025-11-23T13:36:41+00:00

Originally posted by lotas

Why are you supplying power (voltage) inside the power supply (to the output of the LED drivers)? You can burn out the LED driver itself this way. If you haven't already, you should always disconnect the connector from the power supply and supply power from the tester to the backlight wires!

ouch hope nothing happened yet thank you for the information

**bohaboha** · 2025-11-23T13:41:59+00:00

Originally posted by Diah

regards to yours POST #60 you still have the old strips. use good one to replace the strips with LED off, and power on the TV let see if there any change.... other wise you have fault strips delivered

i did already contact the seller about the LEDS will see what he answer but old and new 'LEDS mixed it is not a very good idea but for testing ok

**Diah** · 2025-11-23T13:45:30+00:00

Originally posted by bohaboha

i did already contact the seller about the LEDS will see what he answer but old and new 'LEDS mixed it is not a very good idea but for testing ok

LOL. i am not telling you to use them... we need just to test to see if any change about the OFF LED and the dim one, also no need to install on chassis , just plug them at the plug of the defect one

**bohaboha** · 2025-11-23T20:20:42+00:00

Originally posted by Diah

LOL. i am not telling you to use them... we need just to test to see if any change about the OFF LED and the dim one, also no need to install on chassis , just plug them at the plug of the defect one

I did try with three row from my old LEDS ( i tested as lotas prevent me to do)from the set it acts the same but my LEDS Shine better in Dim situation and this situation make me very uncomfortable any how i get an answer from the seller jere what he say :

New message from: hhhelectronic (2,545)

Hello ,
I consulted my engineer again,they told me if the led strips can normally light in tester,they are ok.
Could you please test them each strip by each strip again?If they normally light, no problem with the led strips.

Then it is possible there is a problem with the power supply(motherboard or constant current board)

Please don't worry,if the item not light in tester,i will send you a replacement.
Look forward to your reply.

but with LED Tester they work

PHILIPS 75PUS7805/12 BLACK SCREEN

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Related Topics