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Thread Tools | Display Modes |
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#1 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
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![]() Recently im looking into building my own Led sign board. Wanted to get familiar with them before launching into a project, so picked this up off ebay for £20 delivered ! The guy selling it was down the road from me
![]() This unit however needs some minor repair, the unit when powered off the memory seems to corrupt and forgets what has been written to the display and acts like its from factory. I have not yet opened it to diagnose but will have a look soon looks like it has a memory battery so probably just needs changing. I will also be restoring and replacing every Led in it with brand new ones to help the reliably of the unit. TBC
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Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly ! https://www.facebook.com/Telford-Tel...7894576335359/ |
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#2 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,427
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![]() fixed those!
get that bitch open fast and bin the nicad battery. |
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#3 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
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![]() Deffo mate just waiting on someone to pick a Tv up
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#4 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
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![]() Lol have a look at this bodge repair job didnt even bother to replace the corroded diode and resistor
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#5 | |
Your Awesomeness
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,617
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![]() Quote:
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-- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full |
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#6 |
Your Awesomeness
Join Date: Mar 2012
City & State: Corning, New York
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 4,617
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#7 | |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
|
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#8 | |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
|
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#9 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
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#10 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,427
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![]() 3cell pile of shit - dont worry about it.
you need to clean the corrosion by throwing vinegar all over it, then remove the charge resistor in parallel with the diode from the battery and fit a cr2032 coincell holder. lithium coincells are more reliable. oh - i dont think i need to say what i needed to fix in them! ![]() if they are real bad, you have to lift and replace chipsockets! |
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#11 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,427
|
![]() btw, once it works you'l love the animated shit like the steam engine!!
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#12 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
|
![]() Nice one, so remove the resistor and diode, then install a cr2032 socket and battery guessing that the diode and resistor that charge the previous battery? Also removed them chips before and the sockets are corroded so got to clean them as well as the pins on the Ic's.
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#13 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
|
![]() Just to be sure, is this the diode and resistor you mean ?
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#14 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,427
|
![]() the diode and resistor are inline with the battery,
the diode stops the battery getting hit with 5v when it's running, the resistor bleeds some power across the diode to charge the battery. you must have the diode inline with the battery to prevent it getting destroyed by 5v, but you remove the resistor to prevent it being recharged. diode should be a schottky to minimise the voltdrop btw, the battery will be 3v and the ram is rated down to 2v from what i remember. |
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#15 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,427
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![]() lol your foto shows they put the diode and resistor in each others places!
they should lead to the battery + terminal |
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#16 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
|
![]() I see the ones you mean now, the resistor is at the top here and the diode is at the bottom. So remove the resistor when adding the CR2032 socket ?
Last edited by ReeceyBurger123; 12-09-2015 at 05:14 PM.. |
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#17 |
Never Give Up !
Join Date: May 2014
City & State: Telford
My Country: Britain
Line Voltage: 240 VAC 50Hz
I'm a: Student Tech
Posts: 7,232
|
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#18 |
New Member
Join Date: Jul 2018
City & State: Calgary
My Country: Canada
I'm a: Knowledge Seeker
Posts: 1
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#19 |
Great Sage 齊天大聖
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 26,427
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![]() just remove the resistor,
and use a single cr2032 battery. |
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#20 |
New Member
Join Date: Nov 2021
City & State: Choctaw
My Country: United States
I'm a: Knowledge Seeker
Posts: 7
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![]() I'm working on removing the NICAD from mine as well and doing this battery mod. The resister to be removed is R4 on the main board, correct?
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