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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 Page
Checking drives and 4~5
Scan IC's
Removing and 6
reinstalling scan IC's
using nozzle type
soldering station
Removing and 7
reinstalling scan IC's
using Chipquick
Removing blue glue 8~10
from scan IC's
Blue glue model list 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
bus bar 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.
5
How to replace the SCAN ICs
There are two possiblities:
- with a nozzle type soldering station
- with the CHIPQUICK SMD1 removal kit Work ESD safe
With nozzle type desoldering station
1 2 3
Mount the right type Add solder to all pins Heat up all pins with
of nozzle of the defective SCAN IC the nozzle.When solder reflows,
remove IC with pick up tool
6
4 5 6
Once the IC is positioned,
Remove IC and clean PCB. Solder all pins and check
tip it diagonal so it cannot
Check PCB for damaged very carefully for dry joints
move anymore
patterns and short-circuits. or short circuits
(Solder two opposite corners)
6
With Chipquick
Another way to remove SMDs is with a special solder made by Chip Quik.The solder is an alloy of tin, lead, indium,
and bismuth. Bismuth has a very low thermal conductivity. If it is mixed with tin, the melting point is reduced to 65