BeoVision 7-40 MK5, faded/blank picture with sound.

4 replies
JM
Jay-Asher Morgan
Bronze
21 posts
Posted September 6, 2020 at 13:38 GMT
#2143223

Afternoon all. I have a BeoVision 7 which has recently developed a strange intermittent fault. When turning the TV on, I can see the curtains open, and the picture displays for a few seconds, but extremely dim. Before the curtains fully open, the screen has gone totally black, but I am still getting sound. 

Turning the TV off and on a few times has it come to life normally. The colder the TV, the more power cycles it takes to get working. If it’s been off for an hour, it will take 1 or 2, but first thing in the morning I can try for 10 or so minutes.

Video of this happening here  

JM
Jay-Asher Morgan
Bronze
21 posts
Posted October 6, 2020 at 18:24 GMT
#2143224

Anyone? Anything? I can’t be the only one with this fault can I?

More footage here 

JV
jvezina
Gold
260 posts
Posted October 6, 2020 at 18:55 GMT
#2143225

Looks like a backlight problem. The backlight circuitry is quite stressed and more prone to fail than the rest. If you are not skilled in repairing electronics, this is a job for a technician:

Three possible causes of the problem:

1- The power supply of the TV. It is no longer able to supply enough current to the backlight circuit.

2- The PIM (Panel Interface Module) PCB where the backlight is controlled.

3- Embedded electronics of the LCD panel itself (short circuits in the LEDs, etc). This problem is the worst as the entire panel will have to be replaced.

Good luck,

Jean

 

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beovision-Eclipse.png Beovision-Eclipse.png
Beotime.png Beotime.png
Beoremote-One.png Beoremote-One.png
Beoplay-A1.png Beoplay-A1.png
JM
Jay-Asher Morgan
Bronze
21 posts
Posted October 6, 2020 at 19:04 GMT
#2143226

Hi. 

Thank you.  

The  B&O tech wants to sell me a 2nd hand TV as the solution, so it’s something I would have to repair myself. 

Is there anything I can do to narrow down the possible cause? If it was the backlight, why is only half the panel displaying a picture?

Thank you.  

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