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Author Topic: Alinco DR-599 Display bulb replacement  (Read 3246 times)
N4VQT
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Posts: 14




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« on: May 21, 2010, 05:39:47 PM »

I just dusted off a DR-599 dual band mobile rig which has been in storage for about 12 years. I replaced the memory battery and when I powered up rig, I noticed that the left side of the LCD display was dim. I tried changing the brightness using the function key/dim process but I didn't see any noticable changes to the backlight brightness. About 12 hours later, the entire display lost its backlighting. I can still see the LCD characters but they are hard to read. The lighting behind the control knobs and buttons still works fine.

I assume the backlighting bulbs have burned out or, the circuit that controls those bulbs may have a problem. Assuming it's the bulbs that simply burned out, I need some instructions on how to replace the LCD display bulbs on my rig. 

On the other hand, if there is a brightness control circuit that may be causing this problem, I would like to know if that is a possible culprit.

If anyone can point me to a link on the net that would explain how to replace the bulbs or hear from anyone who may have performed this repair, I would greatly appreciate it.

Thanks,
Rick N4VQT
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MM0EEY
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Posts: 27




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« Reply #1 on: May 23, 2010, 09:39:06 AM »

Hi, I have just repaired an old Yaesu FT-2500M that had dead screen bulbs, replaced them with blue LEDs, used the 3mm sized ones with a suitable resistor, looks pretty good and way less heat than the filament bulb.

Takes a bit of work with the soldering iron, but worth it I think and the LEDs should last much longer than the bulbs. You can choose from a wide range of LED colors too so if the bulbs are broken, thats your solution.

Pete
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N4NYY
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Posts: 4758




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« Reply #2 on: May 23, 2010, 09:55:24 AM »

You want to replace them with a "Flat Top" LED. These have flat tops with disperses the light at a much wider angle than a rounded LED.

I use these all the time in restores or repairs. You will need a 330 or 470 ohm resistor as a drop resistor. Note, that these come in all colors. If you prefer the incandescent look, get "warm" white. Clear white has that "ice" look. They also come on various other colors. Blue, green, red, are all popular.

Most of these on ebay are shipped from the Hong Kong area. I have ordered several, and they take about a week to arrive.

They also come in 5mm (standard), and 3mm sizes.

http://cgi.ebay.com/20-X-5mm-Flat-Top-warm-white-LED-Wide-Angle-Light-lamp-/110416301254?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item19b5530cc6
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VK1FH
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Posts: 3




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« Reply #3 on: May 26, 2011, 11:04:37 PM »

Hi There iwonder if you can help me and tell me where the bulb to light the display is and how to acess it
Kind Regards
FRED
VK1FH
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N4NYY
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Posts: 4758




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« Reply #4 on: May 27, 2011, 04:53:43 AM »

Try this: http://w2mmd.org/TheElmersCorner.aspx

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VK1FH
Member

Posts: 3




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« Reply #5 on: May 27, 2011, 09:54:00 PM »

Thank YOU very much for your kind reply but i still would like to know how to get the old bulb out and where it is but if i am not sucessfull will try like your drawing and take it from a 12V source somewhere
your advice was greatly apreciated
kind regards
fred
vk1fh
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N4NYY
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Posts: 4758




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« Reply #6 on: May 28, 2011, 05:23:43 AM »

Ugh. I hate to say this, but looking at the radio, it is likely inside the faceplate which would requires removing the mic connector. That is a pain in the ass.
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VK1FH
Member

Posts: 3




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« Reply #7 on: May 29, 2011, 08:33:48 PM »

Thanks fr your help i am also loooking for a ccts encoder board its a EJ-7U FOR ALINCO DJ-596
REGARDS
FRED
VK1FH
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