Tip for repairing cut CPU lines - GSM-Forum

Scaramouche · 12-18-2002, 02:17

Hey everyone
This is just a small tip, some of you already know this but for those who don't continue reading!!

If youve got a phone with cut CPU lines, ie keypad or LCD etc, doesnt work, you can sometimes use a jumper wire to bridge them to the CPU Via.

If you look on the PCB you will see many little gold dots & indentations, they are VIA's & they route connections through the PCB. The trick is to find the right one & jumper it.

Yesterday i got a 3310 with dots & rubbish coming up on the LCD. I measured all the LCD connector pads, and found that the the LCDCDX line was cut from the CPU. I got another 3310, and using a multimeter, found the connecting VIA. It was right behind the CPU. Measuring the same spots on the broken phone i found that there was no connection. So i made a jumper using enameled copper wire, and it worked fine.

Just a small tip, hope it helps someone.

Ryu · 12-18-2002, 02:36

thanks for sharing!!

b0ba · 12-18-2002, 21:35

People that can use multimeter have a great future!

I just wonder why other people still havent got the multimeter?

DREAMGSM · 12-19-2002, 09:35

Yeah, without a multimeter you are lost in the big repair world hehehehehehe

12-18-2002, 02:17	#1 (permalink)
Scaramouche Freak Poster Join Date: May 2002 Location: Perth, Western Australia Age: 45 Posts: 313 Member: 11937 Status: Offline Thanks Meter: 1	Tip for repairing cut CPU lines Hey everyone This is just a small tip, some of you already know this but for those who don't continue reading!! If youve got a phone with cut CPU lines, ie keypad or LCD etc, doesnt work, you can sometimes use a jumper wire to bridge them to the CPU Via. If you look on the PCB you will see many little gold dots & indentations, they are VIA's & they route connections through the PCB. The trick is to find the right one & jumper it. Yesterday i got a 3310 with dots & rubbish coming up on the LCD. I measured all the LCD connector pads, and found that the the LCDCDX line was cut from the CPU. I got another 3310, and using a multimeter, found the connecting VIA. It was right behind the CPU. Measuring the same spots on the broken phone i found that there was no connection. So i made a jumper using enameled copper wire, and it worked fine. Just a small tip, hope it helps someone.

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12-18-2002, 02:36	#2 (permalink)
Ryu Freak Poster Join Date: May 1999 Location: uk Posts: 419 Member: 131 Status: Offline Thanks Meter: 11	thanks for sharing!!

12-18-2002, 21:35	#3 (permalink)
b0ba No Life Poster Join Date: Oct 2001 Location: No route to host. Age: 43 Posts: 895 Member: 6772 Status: Offline Thanks Meter: 17	People that can use multimeter have a great future! I just wonder why other people still havent got the multimeter?

12-19-2002, 09:35	#4 (permalink)
DREAMGSM Freak Poster Join Date: Feb 2001 Location: SPAIN Posts: 318 Member: 3377 Status: Offline Thanks Meter: 1	Yeah, without a multimeter you are lost in the big repair world hehehehehehe