Chosen Solution
Got an iPhone 6 for repair, was showing no modem firmware and no Imei after the 06 dial test. Done monkey see monkey do, jumped 2 pins, reballed baseband and got half of the problem solved. Now it shows modem firmware and IMEI number is listed in iPhone Info, however the *#06 # test dial keeps not showing IMEI and phone still stuck on searching. SIM is correctly detected when inserted and NO SIM warning prompts as it should. It seems baseband is working fine or am I missing something ? Anyone had a similar issue solved and can provide some insight ? Thanks Tried replacing U_ASM_RF as well, no joy. I’m a bit at a loss here, the other two candidates (WTR1625L and U_WFR_RF) look pretty hard to replace and I don’t even seem to have the right stencils. Any reasonable way to test baseband further or should I add this to the pile of spare boards ?
Did you do short or long jumpers as part of your repair? Short jumpers don’t always work and have a higher return rate. The Intro group on FB has all kinds of testimonials about this. Long jumpers seem to solve the problem but removing the SIM reader can be a pain. I would check for proper continuity on the V1 pad to the TP under the SIM reader. There may be a break on the trace internally within the pcb.
