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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old June 3rd, 2006, 19:51   #1
Ray_G
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Default B4 Factory radio LCD backlights burned out? How to change them.

Does your B4 Passat have the factory Premium radio, but the LCD backlights are burned out?? Here is how you fix that annoying problem. The two bulbs that light the LCD are under the LCD on the back of the face plate. They are soldered onto the board that holds the LCD. First get two of these and remove the radio. Before you remove the radio make sure you have the radios code, because when you take it out you will kill the power to it and the radio will be in the safe mode when you put it back in:
Dimensions of the key below courtesy of Wypij. Thank you.



The keys slide into the radio as shown here. You need one for each side:


After you insert the keys pull the radio straight out. After the radio wires are disconnected and the radio has been removed you have to remove the face plate. You get a screw driver and insert it behind the face plate as shown and gently pry the face off. It is just snapped on. No screws have to be removed. When you pull the face plate off the volume control knob will pop off, so make sure you catch it so you don't lose it.


This is the back of the face plate. This is where the bulbs are. You have to remove the board from the back of the face plate. Remove the 6 screws as shown.


This is a picture of tabs you have to straighten to get the LCD off. The bulbs are hidden under it:


This is a shot of the LCD coming off the board:


After you pull the LCD completely off there are two bulbs, one on each side of the board as shown:


You have to remove the bulbs from the board, first you have to get them out of the green holder that they are in. You can just pull up on the holder. It feels like it is made from silicone or similar material. You won't hurt it. It is really soft.


This is a shot of the bulb pulled up and the holder removed:


You can buy the bulbs that fit this board at Radio Shack. The bulb number I used is 272-1092 Radio Shack stock number #7219. They are 12v, 60ma lamps, two to a pack $1.29. This is a shot of the board with the LCD removed. After you solder new bulbs in you put the LCD back on the board, bend the tabs that hold it to the board and reassemble the radio opposite the way you took it apart.


The only part of the job that is difficult is the soldering of the new bulbs. They are small and you need some patience and a little soldering skill to do it.
Ray
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Last edited by Ray_G; March 14th, 2007 at 05:39.
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Old June 22nd, 2006, 17:46   #2
nhdude
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Default Ah-ha!

Thanks for posting this Ray! I wondered why I have no lights at all on the radio display... now I know. May I assume that those radio keys are dealer items?

Thanks again!
Carl
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Old June 22nd, 2006, 19:32   #3
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No problem. I sent you an IM with a place to buy the keys.
Ray
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Old June 22nd, 2006, 20:16   #4
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Where would i get the tool to remove the radio??
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Old June 22nd, 2006, 20:25   #5
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The place I got mine was ebay, there are several people that sell them.
Ray
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Old August 14th, 2006, 19:20   #6
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Default lamp voltage?

I just bought some lamps at Radio Shack. They are 12 volts and I was wondering if you have any idea what the voltage was of the lamps you replaced?

The ones I got came in single packages for $1.29 each and are called mini lamps 12v 25mA.

The only other lights I saw were led's with lower voltages like 2.8 volts.

Any help before I start un-soldering would be appreciated!
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Old August 14th, 2006, 20:09   #7
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Dave,
They are the smallest bulbs that Radio shack carries. I believe that they are 12volts. They are not LED's.
Ray
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Old August 14th, 2006, 20:27   #8
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Thanks for the quick reply Ray. It looks like the ones that I bought from what I see in your pictures.

The Radio Shack part number on the ones I got is 272-1141. 12volts 25mA.

The only difference is that these come with a 1 3/4" lead that I'll have to cut off first.
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Old August 14th, 2006, 21:04   #9
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Nah, solder them in first, then clip them off. they are way too long! just make sure you don't solder the bulb standing straight up with no extra wire to work with. Remember you do have to lay them down parallel to the board they are on. Ask me how I know!
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Old October 19th, 2006, 20:42   #10
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Thanks to Marius (Wypij) for taking my scanned removal key and putting dimensions on it so if you want to make your own........
Ray
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Old November 4th, 2006, 18:31   #11
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Smile

Ray,

Thanks again for the post with the photos. I just finished fixing my radio lights and it works great. The whole thing took me about 30 minutes, once I got the radio out! I need to make some of those removal tools.

By the way here's the info on the lights I got from Radio Shack:

p/n 272-1092
Package of 2
#7219
Micro Lamp
12v 60ma Wire terminal base
Brightness .15MSCP
Lamp type 7219
average life 10,000 hours (so hopefully I won't be changing them again, on this car)
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Old November 17th, 2006, 19:25   #12
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Thumbs up Just seeing this thread now...

Ray, nice write up and thanks for the bulb specs dslemaire.

A few months or so before you wrote this up I had the task of taking 3 complete OEM A3 radios with different problems and creating two complete funtional units. I did take pictures and was going to write it up . Anyhow, it was fun!

Unit one: was a fully operational unit but with a busted up face (guessing it was from a removal attempt with the wrong or even NO removal tools).

Unit two: tape deck was luggage

Unit three: had a crazy issue with the volume where you'd go to turn it down and it would go up really high!

In the end two perfect H/U's and one sitting on blocks
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Old November 25th, 2006, 14:52   #13
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I was just going to replace the GLX's radio (no back light) with the one from the TDI, but seeing how easy this appears, I'll replace the lamps.
BTW, The radio I'll be repairing does NOT require a code to operate. It is the same Matsu$hita/Panasonic as the other B4 have. I have a code from the prior owner, but have yet to need it despite sitting for weeks (months, really) with no power. The one from the TDI needs a code re-entered each time I hiccup.
HAH! I beat Fred's 'naughty word' blocker.
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Old January 25th, 2007, 08:47   #14
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What about replacing the bulbs that are in the black bayonett sockets? All but one is burnt out on my radio.
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Old January 25th, 2007, 10:28   #15
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No problem, just change them. This how to was specifically for the LCD back lights that go out. You either get a dark LCD or only half of it lit up.
Ray
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