troubles with backlight on skd204-634

volker

New member
everything on my display seems fine but backlight wont work :(
voltage is ok with 5V measured with my multimeter on J2 pin +5V LED and ground. but nothing.....

so connex looked like this

| | | | | | | J2
| | | | 5 5 G
| | | | V V N
| | | | D

any help would be great

THX

Volker
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CF Tech

Administrator
Probably we need to have you contact orders@crystalfontz.com to arrange an RMA. However here are some things you can check:



Please let me know the measurements on your display for these locations when the backlight is set to 100%. I measured a typical display and got these values:

+5v(LED) to GROUND: 5v
TPP to GROUND: 5v
TPG to GROUND: 5v
TPS to GROUND: 135mV
TPK to GROUND: 627mV
TPA to GROUND: 4.84v

Thanks.
 

volker

New member
hmm, my values differs from yours

+5v(LED) to GROUND: 5.01v
TPP to GROUND: 5.01v
TPG to GROUND: 0v
TPS to GROUND: 0mV
TPK to GROUND: 0mV
TPA to GROUND: 5.01v

one other thing to mention, on your pic there are some parts on Q1, R10 and R12, which are empty on my print

Thanks

Volker
 
USB LCD Displays - Graphic and Character LCDs with a Keypad

CF Tech

Administrator
That sounds like it would have to be a reflective display (SKD204634-SS) rather than a backlit one (SKD204634-SGLG).

Is there a backlight soldered into A & K?
 

volker

New member
no, there are no parts soldered into these contacts - i think i should contact your shipping department, as i it came out that these are the wrong parts shipped :(

Thanks for your help

Volker
 
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