HP ZR2740w almost dead

[budm]

Re: HP ZR2740w almost dead

This is LED backlights LCD panel, no high voltage inverter board, it has power supply/LED Driver board combination.
P804 connector goes to the LED stings (looks like it has 4 strings, VD1~VD4) inside the LCD panel.
So check the DC Voltages on P803 which has the labels for each pin, report the readings with the name of each pin also.
More likely to have one or more string with open LED so it goes into protection shutdown, or the wires to the LED assemblies shorted to the chassis.

[wash]

Re: HP ZR2740w almost dead

P803 and P804 are the headers in the upper and lower right corners of the 1st picture.

i'm sorry but...i don't understand what do you mean....

where exactly?

[HAHOMETP]

Re: HP ZR2740w almost dead

You are probably looking at the jumper J802.

P803 and P804 are the headers in the upper and lower right corners of the 1st picture.

The picture in your last post is of the T-Con board. What you need is the inverter board driving the backlight. This board will have several high voltage transformers on it.

[wash]

Re: HP ZR2740w almost dead

wash,

I'd first check all voltages on P803 and P804 against their respective silkscreens.
If they are there then your power supply (pic 1 and 2 from left) is working fine.

Next I'd move over to the inverter board (not shown in your pix).

do you see p803 and 4 in the photo? i see only p802 on the left-center

Next I'd move over to the inverter board (not shown in your pix).

do you mean this? (attachment)

[HAHOMETP]

Re: HP ZR2740w almost dead

wash,

I'd first check all of the voltages on the P803 and the P804 against their respective silkscreens.
If they are present then your power supply (pic 1 and 2) is working fine.

Next I'd move over to the inverter board (not shown in your pix).

[wash]

Re: HP ZR2740w almost dead

the symptom is called "2 seconds to black". Read the sticky for starters.

so can i post the photos and do you think you could help me?

(i have a multimeter, soldering stuff and so on)

thank you...

[CapLeaker]

Re: HP ZR2740w almost dead

the symptom is called "2 seconds to black". Read the sticky for starters.

[wash]

Re: HP ZR2740w almost dead

i've dismounted the monitor and i don't see anything wrong, nothing burned, all caps seems ok...

[wash]

Hallo, i have a big problem with my monitor.
I'll try to explain the problem with my poor english ...


Now, is out of warranty and is unusable

after a while the monitor goes off, and when i click the power button to power on again, i see the image for a second, as a flash, then it goes black again, i click the power button, another flash, then black, and so on...

i've seen is a common problem with this monitor, is the worst made monitor i've ever seen, and it was a 800€ monitor, thank you hp.

i've had this problem this summer, but after some week the problem disappeared, but now the problem is again here and i have not warranty anymore (i had to use warranty months ago...my bad)


do you think is possible to repair it?