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Cheers Duke, I will have to take another thorough look over everything. Last resort will be BIOS chip and if no joy, it's one for the bin or eBay...

If it's highly unlikely then I'd definitely prefer to exhaust all other options first. Any thing wrong in those pictures? Anything else to test or try before the BIOS? Cheers

I've been taking a look at some old posts and found this. Replace BIOS time? https://www.rossmanngroup.com/boards/forum/board-repair-troubleshooting/12335-solved-820-3437-no-pm_slp_s4_l

No Title Sure, how are these?

Yes multi meter only catching it jump to 0.2-0.3v max.

U1950, Pin 8 = 3.4v U6100 has continuity to everything it should. Pin 1 = 3.27v Pin 2 = 3.27v Pin 3 = 3.32v Pin 4 = GND Pin 5 = 0v Pin 6 = 0v Pin 7 = 3.0v Pin 8 = 3.32v R6128 = 26.7ohm has continuity to R6113=15ohm and R6123=25ohm R6127 = 43ohm has continuity to R6122=43ohm and R6112=15ohm...

Following on from previous repair. This board had a new U7100, Q7130, DC In Board and DC Flex Cable to bring back green/orange light. It still wont turn on and I have the following: PPBUS_G3H = 8.5v PPBUS_S5_HS_COMPUTING_ISNS = 8.5v PPBUS_S5_HS_OTHER_ISNS = 8.5v PPDCIN_G3H_ISOL = 14.9v...

I bought this one. Works fine. http://www.ebay.co.uk/itm/272048208731

Any ideas chaps?

That connector was a pain but all sorted. I have the new DC in board and flex cable connected. I have green/orange light :) It still will not turn on though. PPBUS_G3H = 8.5v PPBUS_S5_HS_COMPUTING_ISNS = 8.5v PPBUS_S5_HS_OTHER_ISNS = 8.5v PPDCIN_G3H_ISOL = 14.9v PPDCIN_G3H = 14.9v...

Is there a reference of good diode mode values for the common things like PPBUS_G3H and PP3V42_G3H for the different boards? I don't have a working spare, only donors. I am dealing with this board and finding shorts. Both of these rails were shorted to ground, both around 32 on diode mode. I...

No Title PPBUS_G3H = 8.54v PP3V42_G3H = 3.34v But.... This explains the burning smell from when I injected 3.4v originally. I thought it was from that area but couldn't be sure. Also explains no green light. New DC IN Board and Flex cable ordered. Can't find J9500 on ebay so will have to swap...

Progress again! :) So I took that U7100 from the donor board and now I have PPBUS_G3H and PP3V42_G3H So it seems that the problem was that the short I found on the PP15V_TBT circuit was taking out U7100...? Still no green light so on to more troubleshooting.

Thanks for the reply. I don't have a known good board :( Donor with U7100 on the board, PPBUS_G3H = 410 Donor with U7100 off the board, PPBUS_G3H = 120 These are my PPBUS_G3H measurements with U7100 on the board I'm trying to repair. R7006 Pin1 = 117 R5501 Pin1 = 118 Q5500 Pin4 = 119 R5450...

While I was trying to figure out what was going on, I looked for more shorts and found that U3090 had shorts to ground on TBTBST_SNS1 and TBTBST_SNS so I have removed that chip just in case. The shorts to ground on those lines are now gone. No change in PPBUS_G3H... U3090 is just thunderbolt...

Yes you were right, Q7130 D-S was shorted. Swapped for another one and short has gone. U7100 21/24 are good and have continuity to Pins 1/6 on Q7130 Q3080 D-S was shorted so removed for now. PPBUS_G3H = 4.57v Sorry this is taking so long.... The learning curve is steep but I'm taking it all in!

Changed both at the same time. U7100 was new. Q7130 from a donor. Same situation though, nothing better or worse. Q7130: Pin1 = 4.57v Pin2 = 4.57v Pin3,4,5 GND Pin 6 = 0v Pin7 = 4.57v Let me know if you need pin voltages from U7100 or anything else. Cheers

Thanks, will do. I just changed R7151 and this got me back to 3.6ohm between 17+18 on U7100.

Measurments are now: PPBUS_G3H = 14.4v PP3V42_G3H = 3.42v U7100: Resistance between pins 17+18 is now 80 ohm... Resistance between pins 27+28 is still 20 ohm.

Some progress... Q3080 led me to the right direction. PP15V_TBT was shorted to ground. I have now removed a number of caps on that line and the short is now gone from PP15V_TBT. I put back on F7140 and Q7130 and retested. No more dancing 14.4v at DC IN :) But still no green light. Will test...