LCD display connection

[DIYspanner]

Its a kitchen weigh scale, Salter brand.
Was asked to look at it. It was switching on but not displaying any weigh values. When I took it apart, the LCD was loose.

Can these LCD displays be easily bonded back on to the PCB?

 

[jj4091]

Has it still got the protective fim seal on it or are there several cracks in the screen. if it's the latter I doubt it is worth trying.

 

[robinbanks]

Quite often they are loose and just have some sort of compressible rubbery strip with connectors inside that presses on a row of exposed gold coloured contacts on a PCB. See if yours is like this; does it activate properly when you hold it in position?

 

[DIYspanner]

This photo is of the back of the lcd display that lies on the pcb.
I can only assume the lcd was bonded to the pcb.

 

[sparkymarka]

Zebra strip connector

 

[robinbanks]

Not bonded. Like I said, just see if it activates if you hold it in place and apply even pressure. The black strip in the middle of the connector touches the row of gold terminals on the PCB

Tip, for taking close up shots, don't actually go so close. A camera is like an eye and has a minimum distance it can still focus on (hold a book a centimetre from your eye and see if you can focus - I doubt you will). You get sharper photos further away. Zoom and crop the resulting image if needed; it will be clearer than bringing the phone too near

 

[charlie275]

It looks like you're holding it wrong. The LCD connections are usually under a 'lip' along the edge on the reverse side, not along the edge itself.

The zebra strip is held in place by pressure alone sandwiched between the LCD and the board. There may also be a foam pad between board and LCD to allow it to sit flat with the correct spacing. It is typically just a friction fit within the enclosure so no surprise if it came loose on opening.

See - How can I re-assemble this cheap scale's LCD display?

 

[Harry Bloomfield]

You could try cleaning the contact and the zebra strip gently, with alcohol. Contact is made, by applying pressure between the pcb and the LCD, when the unit is assembled in its case, slightly compressing the zebra strip. Sometimes, the cases don't exert enough pressure, or swell over time - the solution might be to pack out the back of the pcb, with some cardboard, or similar.