Planar PL1910M LCD will not power on

[samnabass]

Hi to all.
This monitor has been driving me nuts for the past two days and I just can't figure it out so i came in for some help.
The main problem is the monitor will not turn on just a flashing LED on the ON button.
The back lights were checked to be OK
All the caps checked ok with and ESR Tester.
All the diodes checked OK – Desolder one leg and test with a smart tweezers.
MOSFET Tested Ok.
Resolder all the joints on the back side.
And still no go – so I figured maybe I should try to power it from an external power adapter but there are no marking on the board to which pen is which. So I plugged in a couple of extra back lights to the board. Flipped it upside down and fired it up and start poking the bins I found the +5V / +12 / Ground / On / Of while doing that I accidentally jumped the pins marked on the attached image A&B and the back lights come on and stayed on – tried to trace the connectors to the Video board but that's almost impassible.
All the caps on the video board checked ok too.
Any ideas ???

[mladen82]

Re: Planar PL1910M LCD will not power on

if dc voltages +5V and +12V are fine and if are regulated voltages on main a/d board (3.3V or 1.8V probably) are fine too, problem is probably in mcu (or his eeprom) as led flashing, however check for possible shorts (smd capacitors) on main board or even shorts towards lcd panel electronics

[samnabass]

Re: Planar PL1910M LCD will not power on

Hi, Thanks for the info - i did check as much as i can with no luck - i spend too much time on this board and i think it's time for it to be recycled.

Take Care.

[EGuevarae]

Re: Planar PL1910M LCD will not power on

Hi to all.
This monitor has been driving me nuts for the past two days and I just can't figure it out so i came in for some help.
The main problem is the monitor will not turn on just a flashing LED on the ON button.
The back lights were checked to be OK
All the caps checked ok with and ESR Tester.
All the diodes checked OK – Desolder one leg and test with a smart tweezers.
MOSFET Tested Ok.
Resolder all the joints on the back side.
And still no go – so I figured maybe I should try to power it from an external power adapter but there are no marking on the board to which pen is which. So I plugged in a couple of extra back lights to the board. Flipped it upside down and fired it up and start poking the bins I found the +5V / +12 / Ground / On / Of while doing that I accidentally jumped the pins marked on the attached image A&B and the back lights come on and stayed on – tried to trace the connectors to the Video board but that's almost impassible.
All the caps on the video board checked ok too.
Any ideas ???

Looks more like a Hanns-G than a Planar.... look at this thread : https://www.badcaps.net/forum/showthread.php?t=6695
Did you check the LCD without the LCD connected to the VBoard to see how the power LED behaves?

[stneargd]

Re: Planar PL1910M LCD will not power on

If the led is flashing green and amber, the unit needs reset. I have purchased 3 of these units with this issue and all worked after resetting.

Here is the link to the reset procedure:
http://marsbox.com/blog/howtos/plana...d-monitor-fix/

[pfjoe]

Re: Planar PL1910M LCD will not power on

strneargd ... you are my new hero ... thanks!!!

[sceva]

Re: Planar PL1910M LCD will not power on

If the led is flashing green and amber, the unit needs reset. I have purchased 3 of these units with this issue and all worked after resetting.

Here is the link to the reset procedure:
http://marsbox.com/blog/howtos/plana...d-monitor-fix/

I just fixed a Planar PL1911M with the same problem!! Thanks for the link.

[DigitalStone]

Re: Planar PL1910M LCD will not power on

I just fixed a Planar PL1911M with the same problem!! Thanks for the link.

Same here. Thanks for the link. Wish I had found this before I took it apart.
Works great now.

[jfarrell]

Re: Planar PL1910M LCD will not power on

OK so this planar was fixed with a reset...amazing....
now my question is...
How many other monitors allow a similar reset, to get them going again.
( is planar the lone dog? )