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bonux
22nd February, 2011, 10:36 AM
Hi im having problems with volvo v70 cluster as it doesnt works when cold weather, needles and light doesnt work,just nahdrake and belt lights only. when i put some pressure to left button it starts to work and works for a while but after driving few km it goes off again. no visible cold solder, tried resolder can lines from connector to mcu with no luck, maybe somebody had same problem and knows solution where to put solder? thanks!
omglol
22nd February, 2011, 12:11 PM
Faulty MCU 99%.
Eight
22nd February, 2011, 01:19 PM
it is a problem in the MCU.
I had this problem I changed MCU 68HC08AZ32
T72
22nd February, 2011, 02:02 PM
it is a problem in the MCU.
I had this problem I changed MCU 68HC08AZ32
there is no 08az32 in this dash!
bonux
22nd February, 2011, 02:17 PM
Sorry forgot to mention, its MC912DG128 (3K91D) in this dash so i dont believe its mcu as only 908 series had problems with mcu
omglol
23rd February, 2011, 07:57 PM
Sorry forgot to mention, its MC912DG128 (3K91D) in this dash so i dont believe its mcu as only 908 series had problems with mcu

Oh yes they do, I am doing Volvo S60 2003 with MC912DG128A (3K91D) next week.
JandJSpeedShop
7th March, 2011, 08:42 PM
Just had a customer with a 2003 Volvo V70 call me and he is bringing me the car at the end of this week. I guess the odometer is dead or only functions sometimes. Does this sound like an MCU problem and it that very common on this type of vehicle? Does the processor go bad or it is just bad solder joints? I can purchase a new MCU from Mouser.com for around $40, but I can probably get another instrument panel display from a local recycling yard for about the same price and reprogram it. Any thoughts or ideas?
omglol
8th March, 2011, 12:22 AM
There aren't any bad solder points. Heat up the old MCU a little bit and read FLASH+EEPROM. Buy new MCU and program it with old one's FLASH+EEPROM.
JandJSpeedShop
8th March, 2011, 05:03 PM
Okay customer dropped off the vehicle and I was wondering if this sounds like a bad MCU

1. All gauge functions are completely dead (tach, speedo, fuel and coolant)
2. All backlighting is completely dead
3. Turn signals don't illuminate on the cluster
4. The LCD's for the mileage don't light up but I can still read the mileage
Meat-Head
8th March, 2011, 07:31 PM
recently there was a thread, fellow member said 50v 100uf capacitor (think)

can you upload photos please.

Thanks

Meat.
jp_olli
9th March, 2011, 06:05 PM
The 100uf/50v is just changed as a precaution. The main reason for these clusters to fail is the solderings. Sometimes the MCU also dies, so there are some variations.

I posted my instructions recently here. (http://www.digital-kaos.co.uk/forums/f174/volvo-cluster-problem-190184/)
Maxpower50
24th May, 2011, 11:04 AM
Hello:

I have a Volvo V70 D5 2001modell With Errors in the left side pixsel What is needed here Solder on new or new display?

Or change the MCU? Some Suggestions,
r-parts
1st July, 2011, 12:39 PM
hello is there a replacement maskset that i can exchange without a problem with 3K91D original one?