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820-3115 (2.5 i5) Not posting with original bios. Works with donor bios but slow. Original bios here: https://drive.google.com/open?id=1X-...t7Fsp9-uIfFr84 Would it please be possible for a clean version or link to a proper guide to clean it. Thank you.

Came back to this one. Found that CHGR_CELL probe point had gone so ran a wire. Briefly plugged in and now i got charger voltage on PPBUS (20v) Q7130 / Q7135 likely targets here ? Thanks.

Thanks Duke. Yes pins 27/28 22ohm (sorry) Replaced U7100 with another from a donor board. Ran a wire for CHGR_UGATE as i was wary of the trace on pin 24 U7100 Now get 5v on PPBUS_G3H. Checked all the resistors etc around U7100 but nothing springs out. Does 5v give any hints ? (thanks)

Pre worked and cleaned board. (sorry) ppbus_Gg3h not shorted 0.45v diode mode. (U7330/20/10 not shorted) Liquid damage to U7100 area Replaced U7100 R7151 R7152 R8131 - ran wire for pp3v42 as pin 1 burnt U7100 resistance pins 23/24 u7100 22ohm pins 17/18 u7100 3.4ohm pin 2 15.8v pin3...

Thanks Duke, it is U1100 that is getting hot unfortunately. One for the parts pin. Thanks for confirming.

iMac 21" 2013 no power. no lights on MLB Tried known good PSU same result. Found that pp3v3_S5 has a dead short to ground. Seems to be on pin 1 of L7610 (0v diode mode) Pin 2 of L7610 is 0.125v Tried injecting some voltage got to 3amp @ 0.7volts Not done many iMac boards so am unsure as to...

Thank you Duke, that confirmed everything. Slight variation in diode mode on the SCL / SDA versus a donor pointed me towards SDA. It was R5360 despite initially measuring ok. Once replaced all working. You may mark as solved Thank you again.

820-3787 Been previously cleaned (boo!) had backlight issues which have been resolved. Fan is running full after about 10 seconds into boot. EFI ASD gives following errors: TM0P TP0P TW0P Ta0P Looked at U5870 as this seems to deal with all of these. Checked continuity to/from this chip...

Hi Paul, I do tend to note down what i replace, along with any other things of note such as previous rework simply in case of warranty return so i know what i have done if needed many months later. I often simplify to "LP8550 and surrounding" for example but it has helped me in the past when a...

820-00165 very clean looking board. No obvious liquid damage anywhere. pp3v42 0.2v ppbus_g3h 0.585v short to ground on pp3v42. removed L7095 - short is on system side (pin2) 0v diode mode 0ohm spent some time removing caps on pp3v42(to oneside then checking for short then putting back)...

Hiya, I think that the aluminium top part should come off albeit with some difficulty, i remember having to glue one back on for someone some years ago. My experience of third party ones out there now is that they are pretty damn poor (most been sitting on a shelf for years). The newertech ones...

Hiya, 12" is a different keyboard. The 15" /17" ones have a much shorter cable as they plugged into a little daughter board with the power button etc, before a smaller connector went to the motherboard. Also 15/17" cable comes out the bottom rather than at the side. There is a site in the UK...

Thank you duke, that worked perfectly. Please mark as solved.

Hi There, 820-2936 With ORIGINAL ROM chip quarter fan spin With DONOR ROM chip - boots fine. ORIGINAL ROM chip is N25q064a. As i don't use the TL866 very often so i found another TEST N25q064a (from a MBP 15" 2012) to play with first to make sure i could remember how to do it. The TEST...

Was the bios chip (U6100). Donor chip boots all the way through - was literally last thing i was going to do before donoring it no signs of damage either. Some ME fuckery to do but can mark this as solved! thank you both for your help.

Hi Duke thanks for the reply. R7402 measures fine, voltages correct either side. (12.56v/12.46v) R7401 also measures fine. is 0v (not jumping) on PLT__RESET_L and MEMVTT_EN worth investigation or should they come up after Vcore ?

Hi Louis, Yes. ALL_SYS_PWRGD does pulse. I checked a lot of things. The only things that looked odd were: 1. pp5v_S0 jumping but only to around 0.2v (which sent me on my U7200 journey as it appeared to be the only rail not jumping to the voltage it should be) 2. MEMVTT_EN is missing and not...

Sorry Louis. Resistance to ground S3 rails. PP5V_S3 20.3k PP3V3_S3 19.8k PP1V5_S3 115ohm PPVTTDDR_S3 25.1k PP1V5_S3_CPU_VCCDQ 113ohm Resistance to ground S0 rails PP5V_S0 29.5k PP3V3_S0 8.8k PP1V8_S0 295ohm PP1V5_S0 14.68k PP0V75_S0_DDRVTT 157k PPVCCSA_S0_CPU 33ohm PP1V05_S0 22.1ohm...

Thank you Louis. 1. U7000 pin 17-18 2.8ohm pin 27-28 20.3ohm 2. S0 rails not jumping to correct voltage (all others present) pp5v_S0 jumping but only to around 0.2v PP0V75_S0_DDRVTT only jumps to 0.02v PPVCORE_S0_CPU 0v PPVCORE_S0_AXG 0v diode mode on pp5v_S0 0.398v drop to ground...

820-2936 liquid damage to SMC area, SMC reset chip and clock chip area. Had no green light. Replaced SMC reset chip, reflowed SMC. Now get green light and PPBUS is 12.56v Now get quarter fan spin Replaced U2800 replaced Y2805 replaced caps etc in that area no change. Checked CPU Vcore. It...