HP10bII Financial Calculator Display Missing Components

[smashgp]

Hi,

My HP10bII Financial Calculator is mulfunctioning, the number on the display miss some components. The 3rd & 5th numbers are not displayed correct e.g. 0 look like C and 8 look H. As per the User's Gide, I press Shift+N+FV simulteneously to reset it but the display of number is still distorted. I even press the reset button at the back with the paper clip but it did not work. I also took off the batteries but still it is the same.

Please assist.

Regards

[Maké]

Hi!, @smashgp:

Welcome, to Forum !.:smileyhappy:

Check, with Self Test, from ... https://www.educalc.net/1776086.page

This Self Tests

is only, one simple test

Streaming and interactive, which, tests keyboard.

Too, you can try, with replace, the two (2) coin batteries Duracell or, other brand, call CR2032. Both, are same.

Or, too ... https://www.educalc.net/443086.page

[andy11]

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@smashgp wrote:

My HP10bII Financial Calculator is mulfunctioning, the number on the display miss some components. The 3rd & 5th numbers are not displayed correct e.g. 0 look like C and 8 look H. As per the User's Gide, I press Shift+N+FV simulteneously to reset it but the display of number is still distorted. I even press the reset button at the back with the paper clip but it did not work. I also took off the batteries but still it is the same.

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I assume that the unit is beyond its warranty period. In that case disassembling it seems to be necessary.

I do not know about the internal build of the 10bII, but  in some HP calculators  the display or its control circuit is connected to the mainboard by a "zebra" connector. If this is the case check if the connections of the zebra connector are solid enough. You could also press, very easy, the circuits connected by zebra connectors to the mainboard and check if the problem disappeared.

Anyway, even if the 10bII has no zebra connetors inside the problem seems to be due to bad connection somewhere inside. You would be very unlucky if the display itself were broken, in that case a repair would be not possible, except for the exchange of the whole display, but as I wrote above in most cases it is caused by a bad connection somewhere inside the unit.

[BartdB]

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@smashgp wrote:

Hi,

My HP10bII Financial Calculator is mulfunctioning, the number on the display miss some components. The 3rd & 5th numbers are not displayed correct e.g. 0 look like C and 8 look H. As per the User's Gide, I press Shift+N+FV simulteneously to reset it but the display of number is still distorted. I even press the reset button at the back with the paper clip but it did not work. I also took off the batteries but still it is the same.

Please assist.

Regards

---

Good day,

If your calculator is in warranty, have it replaced.

If it is out of warranty there may be little you can do about it, other than buy a new one.

Here is a link to someone who tried to repair it:

http://www.keesvandersanden.nl/calculators/hp10bii_repair.php

Unfortunately the screen is connected to the PCB with a thermally attached connector, also called a "heat-seal" connector. These are notoriously difficult to repair. The person in the above link did not  manage to get all the digits working again.

You can google "LCD heat seal connector repair" to see how others have tried to fix it.

Regards.

[smashgp]

Dear Kudos,

Thank you for the advice. I guess I just need to buy a new one.

Kind regards