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Pioneer Plasma Scan Board & IC Troubleshooting Scan IC Removal & Reinstallation Guide Technical Training Department 1925 E. Dominguez Street Long Beach, CA 90810 Contents Topic Checking drives and Scan IC's Removing and reinstalling scan IC's using nozzle type soldering station Removing and reinstalling scan IC's using Chipquick Removing blue glue from scan IC's Blue glue model list Page 4~5 6 7 8~10 11 3 HVxxx Psus, Gndh Vh Checking drives and scan ICs Use static precautions. Do not operate with any connectors unplugged. Replacing scan ICs in home is NOT recommended. If scan board is disconnected, be sure to isolate buss bar also. Discharge all scan board connections including buss before reconnecting. Unplug power connector from X or Y drive. Perform diode check with DVM from Vsus to ground. Should check as a diode. If Y drive shorted, next unplug Scan PCBs. If short goes away, check Scan ICs. If still shorted, replace drive. With Scan PCB unplugged, perform diode check from Vh to Psus (buss bar). Should check as a diode. If shorted, check resistance from Vh and Gndh (buss bar) to HVxxx (each IC has 2 test pads). Should measure 3 to 5 meg ohm (varies by DVM). Remove IC (see SK-D04003) that measures different from others and recheck. If all check the same, but Vh is still shorted, you must check all 64 HV pins of each IC. Remove side rail and 32 feed throughs are accessible near the panel connection. If nothing shows up, loosen Scan PCB and flip over to access all 64 connections. 4 output pins To check for defective scan ICs. First determine which scan board has the problem by doing a diode check between VH and GNDH after you disconnect the ribbon cable between the Y drive and the upper and lower scan assy. The assy that shows a short is the one with the bad scan IC In some panels you must remove the blue glue by using flux remover or acetone. Measure (diode check) between the output pins on the scan ICs and the bus bar on the scan board using either an analog meter or a digital meter in the manual mode. All outpins on all scan ICs should measure about the same resistance. (~300-600 ohms). If not, that IC is defective. Remove that IC and then re-check VH. There can be more than one bad scan IC. bus bar 5 How to replace the SCAN ICs There are two possiblities: - with a nozzle type soldering station - with the CHIPQUICK SMD1 removal kit With nozzle type desoldering station Work ESD safe 3 1 2 Mount the right type of nozzle Add solder to all pins of the defective SCAN IC Heat up all pins with the nozzle.When solder reflows, remove IC with pick up tool 6 4 5 6 Remove IC and clean PCB. Check PCB for damaged patterns and short-circuits. Once the IC is positioned, tip it diagonal so it cannot move anymore (Solder two opposite corners) Solder all pins and check very carefully for dry joints or short circuits 6 With Chipquick Another way to remove SMDs is with a special solder made by Chip Quik.The solder is an alloy of tin