Panasonic TX-40AX630B flashing green standby

[sordids999]

Good evening guys

picked up this tv today the backlight flashes once when you first turn it on then nothing,the only voltages im getting of the PSU legend is 5 volts of one pin only

Does the flashing panasonic led fault error count work the same with LED tvs as it does with panasonic plasma tvs ?

thanks

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

SRV-15.5 volts starts at 15.5 volts but slowly drops
SRV-5.1 volts reading is 5.1 volts stays steady
SRV-VLED starts at 50.8 volts but drops slowly
SRV-26 volts starts at 26 volts but drops quickly

[ReeceyBurger123]

Re: Panasonic TX-40AX630B flashing green standby

That Led voltage seems low, have you tried disconnecting the Leds and retesting ?

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

Already tried that mate

[Diah]

Re: Panasonic TX-40AX630B flashing green standby

do you have 10 time LED blinking ?

[budm]

Re: Panasonic TX-40AX630B flashing green standby

Can we see the straight shot pictures of the bottom side of the Power supply board?

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

the green LED flashes roughly ten flashes but its going so fast then just changes to red flashing LED constantly then

[budm]

Re: Panasonic TX-40AX630B flashing green standby

BTW, what is the LCD panel model number, I cannot read the sticker.

[Diah]

Re: Panasonic TX-40AX630B flashing green standby

i faced same issue of TX series 10 time blinking then red led, and only 24 V dropped down and remain standby V steady, replaced exact new PWB and same result, i took it in parts all and found one LED strips the sockets of it complete disconnected from one strip and make S/C with chassis.

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

Pictures as requested

[budm]

Re: Panasonic TX-40AX630B flashing green standby

Looking at the pictures, it looks like it has 5 strings of LEDs, they are controlled by 5 Transistors Q7802~7806.
What you can do is to put black meter on the chassis, leave the red probe on 'E' of Q7802 then turn on the TV and record the reading, then turn off the TV then move the Red probe to the 'C' of Q7802, turn the TV on and record the reading, do the same for Q7803~7806. If we have one or more open, short LEDs, or open connections in one or more of those 5 LED string the Voltage readings will help us verify.
BTW, the filter cap for the boost converter is only rated at 100uf 100V so 50V reading may be correct.

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

Q7802 e=30.2 volts c=0.0 volts
Q7803 e=30.5 volts c=0.0 volts
Q7804 e=3.6 volts c=0.0 volts
Q7805 e=31.8 volts c=0.0 volts
Q7806 e=29.8 volts c= 0.0 volts

[ReeceyBurger123]

Re: Panasonic TX-40AX630B flashing green standby

Ohh dear 3v, you have a failed Led I bet. Probably time to take the panel apart.

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

Yeah thats what i thought pain in the arse these leds

[ReeceyBurger123]

Re: Panasonic TX-40AX630B flashing green standby

Yep, even the "good" brand ones are bad too.

[ReeceyBurger123]

Re: Panasonic TX-40AX630B flashing green standby

Also what panel is this ?

[sordids999]

Re: Panasonic TX-40AX630B flashing green standby

Also what panel is this ?

thats all i cant find in the picture if you scroll up m8

[ReeceyBurger123]

Re: Panasonic TX-40AX630B flashing green standby

Ahh its one of those crap ones, quite sure they are Auo Lcd screens with some cheap backlighting.

[Diah]

Re: Panasonic TX-40AX630B flashing green standby

please update us if you found LED defects or sockets as i wrote before,

[budm]

Re: Panasonic TX-40AX630B flashing green standby

Hopefully just the socket problem.