OBC Rev Counter Display Repair
#46
Three Wheelin'
I'm about to tackle this by following the instructions here: http://www.bergvillfx.com/obcrepair.html
I can source the bulbs through Pelican, but does anybody know where I can find the transistor? I'm having a difficult time finding one online and am seeing prices ranging from $1-100+. There is obviously a difference between the parts I'm finding but I can't differentiate between them myself. Any help would be appreciated!
Here's a whole page of 'em: http://www.mouser.com/Search/Refine....nnel+fet+bs170
Help...meeeee
Thanks!
I can source the bulbs through Pelican, but does anybody know where I can find the transistor? I'm having a difficult time finding one online and am seeing prices ranging from $1-100+. There is obviously a difference between the parts I'm finding but I can't differentiate between them myself. Any help would be appreciated!
Here's a whole page of 'em: http://www.mouser.com/Search/Refine....nnel+fet+bs170
Help...meeeee
Thanks!
Last edited by asofine; 12-27-2012 at 07:50 PM.
#47
Rennlist Member
You need the TO92 type, the first hit in the list you've linked to will do perfectly.
I've got lot's of these lying around and could send you a transistor, PM me and we'll settle a deal.
Cheers,
Tore
I've got lot's of these lying around and could send you a transistor, PM me and we'll settle a deal.
Cheers,
Tore
#50
Rennlist Member
Iverheul, I have never heard about this before. I have no idea how the rear wiper could interfere with the OBC backlight circuit. Is it dim when it's not supposed to be or what? There could be some short that interfere with the PWM dimmer circuit for the dashboard lights, have you tried to turn the brightness to max?
Cheers,
Tore
Cheers,
Tore
#51
Advanced
Tore, my mech also said he had not heard about this before (fortunately he will have to fix it as part of the sale agreement).
I will try and turn the backlight up te max, see what happens. To possibly counter your theory, all the gauges are not influenced at all by the rear wiper operation (as it should be...)
Will keep you posted.
Liam
I will try and turn the backlight up te max, see what happens. To possibly counter your theory, all the gauges are not influenced at all by the rear wiper operation (as it should be...)
Will keep you posted.
Liam
#52
Rennlist Member
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I changed my transistor, and bulb display is stable and all the digits are there...
But no orange back light.
Is there any more information on the diode?
How about a wiring diagram?
Any suggestions?
But no orange back light.
Is there any more information on the diode?
How about a wiring diagram?
Any suggestions?
#53
Rennlist Member
There is no schematic available for this instrument.
The diode mentioned in Mr. Streathers book is not involved in the backlight circuit. Normally will changing the transistor be sufficient. It may be time to do some measuring to ensure that it is getting the correct on/off signals. This will require some in-depth insight in the circuit.
Cheers,
Tore
The diode mentioned in Mr. Streathers book is not involved in the backlight circuit. Normally will changing the transistor be sufficient. It may be time to do some measuring to ensure that it is getting the correct on/off signals. This will require some in-depth insight in the circuit.
Cheers,
Tore
#55
My display background sometimes would stay on ( but without anything displayed ) when the car off and parked but when running it works perfectly
Could that also be related to the transistor or could it be something as a not correctly retrofitted old alarm system ?
Could that also be related to the transistor or could it be something as a not correctly retrofitted old alarm system ?
#56
Rennlist Member
Maxi-z, this is a typical failed backlight transistor scenario.
Cheers,
Tore
Cheers,
Tore
#57
Rennlist Member
Here is a picture of my tac OBC, you can see its pretty dim (especially on the left side). I’m curious if you think this is a bulb or transistor issue. Thanks
#58
Rennlist Member
This looks normal to me. There is only one backlight bulb in the OBC display, and it works in your instrument.
I guess it looks dim and uneven due to the use of the super bright LED dial lights.
Cheers,
Tore
I guess it looks dim and uneven due to the use of the super bright LED dial lights.
Cheers,
Tore
#59
Rennlist Member
Hi ToreB, The picture makes the dial lights look brighter than they are. They are the original OEM bulbs, not LEDs. I brightened the exposure of the image so it was easier to see how uneven the OBC light looks.
#60
Rennlist Member
Thanks for clarifying this.
My experience is that the OBC LCD backlight is varying from instrument to instrument, some are a bit darker than others, and some are a bit uneven in light distribution.
It could help to change the bulb, but this is by no means a fault in the electronics.
Cheers,
Tore
My experience is that the OBC LCD backlight is varying from instrument to instrument, some are a bit darker than others, and some are a bit uneven in light distribution.
It could help to change the bulb, but this is by no means a fault in the electronics.
Cheers,
Tore