820-00165
second post today (sorry no easy boards for me today)
PPBUS_g3h - 0.9v short to ground.
removed f7700 - short not on LCDBKLT side
removed f7140 no short on pin 1 (if apply power with this removed voltage is 8.5v)
short to ground on system side (pin 2 F7140 onwards)
tried removeing q3080 no change
removed q5500 no change.
replaced u7100
removed C7582 C7540 as got hot, no change
removed R5450 -went from diode mode 0v drop to 0.022 drop with R5450 removed ppbus_g3h goes to 7.4v
replaced with donor R5450 get short again (0v drop diode mode pin2 F7140)
looking on my schematic i can't find R5450 - although it is present on the board. Looks like its labelled R5400 on the schematic.
Tried removing U5450 (brd) U5400 (schematic) no change
Injecting voltage it took 2A and 0.6v and Q7430 got boiling hot, i removed it but the short still remains.
Any suggestions gratefully received.
second post today (sorry no easy boards for me today)
PPBUS_g3h - 0.9v short to ground.
removed f7700 - short not on LCDBKLT side
removed f7140 no short on pin 1 (if apply power with this removed voltage is 8.5v)
short to ground on system side (pin 2 F7140 onwards)
tried removeing q3080 no change
removed q5500 no change.
replaced u7100
removed C7582 C7540 as got hot, no change
removed R5450 -went from diode mode 0v drop to 0.022 drop with R5450 removed ppbus_g3h goes to 7.4v
replaced with donor R5450 get short again (0v drop diode mode pin2 F7140)
looking on my schematic i can't find R5450 - although it is present on the board. Looks like its labelled R5400 on the schematic.
Tried removing U5450 (brd) U5400 (schematic) no change
Injecting voltage it took 2A and 0.6v and Q7430 got boiling hot, i removed it but the short still remains.
Any suggestions gratefully received.