Tank monitor LCD is black

[Paringa]

Ideas and help needed with this please.

 

My BEP marine tank monitor has thrown a wobbler, the display is showing black.

 

I have turned it off and on again and it would normally boot with the logo and then show the display of the tank levels, but now it is only showing black from the start.

 

I took it apart to see what access was like as i had success changing the LCD of my VDO gauge. That was fairly easy as the display supplied had a ribbon and a clamp, this looks more fiddly.

 

Am i correct in thinking the fault is with the display?

 

If so can anyone decipher what those codes mean on the ribbon and point me in the direction of a supplier?

 

I don't want to bin it until i feel i have exhausted all possibilities.

 

Advice welcome.

 

 

 

 

 

 

Edited August 29, 2021 by Paringa
Sorry for upside down picture

[Tony Brooks]

I assume that you have ensured it still has a positive and negative supply. Black suggest to me the display has no current on it (if a few mA can be considered real current).

[Paringa]

Yes my explanation could have been better Tony, thanks.

 

The display is not black without power and when i apply power it goes black. I have pressed the ribbon and cleaned connections and not had it change sadly.

 

I have emailed a local repair person to see if they can help along with the manufacturer of the board and BEP marine, who have been helpful in the past. It is 20 years old though and no longer available...

[Tracy D'arth]

Common failures on semiconductor pcbs are capacitors especially tantalums and electroytics.  May be worth swapping any out for new ones.

A micro examination may reveal a bad connection or crystallised solder joint.