Here is the summary of the 'ex' Curt's G90 unit after finishing servicing the unit :- Found BA board Green Bias issue : R603 (100K 0.5% SMD0805) : found it opened. Resistor replaced : Solve the Green BKG CONTROL issue. Cost : free. Time = 3 hours.
- Ya board I²C buses issue : found DACs controler IC421 (Sony CXD305-127R) that should be defective. Hardly tried to find a replacement part on the net : no more available. Send the board to Ed. (glassact <- Big thanks ) to let him resend it to Sony repair sevice center at San Jose. Board fixed by Sony (IC421 and IC431 were replaced with part that came from Sony Japan). Total YA servicing cost : $1813 including Shippings No choice .Time = 15 hours.
- Found another BA board issue on B/C RGB inputs : Green channel grayscale is compressed after 60 IRE (non-linear). Issue located on IC2 MAX4121CSA (2:1 300MHz MUX). IC2 replaced -> issue solved. Cost : $5 . Time = 2 hours.
- Found EA board issue on H-KEY and H-PIN adjustments (that made nothing on the screen). Issue located on IC2 MC1495BP (four quadrant multiplier) which has pins 8/9/10/11 wih low impedance shorts. IC2 replaced -> issue solved. Cost : $5. Time = 2 hours.
As curt's feeling, this unit should been striked with lightning on Main as the failures I found are relevant to such effects on electronic chips...
Fortunatly, I could swapp the board with my first unit to ease the location of the failures
I've fully retubed the unit (thanks to Chuchuf for the Red, thanks to Fireball66 for the Blue and thanks to Greg Eisemann for the bare green P19LUG HR)
Changed Green 'C' Element with Marquee one for green color purity (thanks to Tim).
Added one IFB-DVI-V2 card in B slot.
I've spent 2 hours on adjusting D65 grayscale tracking with Spyder2Pro and Colorfact 6 Pro.
The unit was sold and installed yesterday : picture is stunning on 2.7m wide screen with HD-DVD from Toshiba HD-XE1
Total cost for servicing the unit : 8500 - Sold: 6500 : this was not a good deal
but it helps me to teach the complete electronic of the G90 : now I'm skilled in it
Cur't you've been cleaver enough to sold this unit to me
it was holding a lot of differents electronic failures
The YA board one was the most costly one; unfortunatly for me