Dell 21N21E2 service manual B2-2

Page 11

DISASSEMBLY INSTRUCTIONS

INSTALLATION

1.Take care of the polarity of new IC and then install the new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

(Refer to Fig. 2-5.)

Soldering Iron

Solder temporarily

Solder temporarily

Fig. 2-5

2.Supply the solder from the upper position of IC leads sliding to the lower position of the IC leads.

(Refer to Fig. 2-6.)

Solder

Soldering Iron

IC

Supply soldering

 

 

from upper position

 

to lower position

Fig. 2-6

3.Absorb the solder left on the lead using the Braided Shield Wire. (Refer to Fig. 2-7.)

NOTE

Do not absorb the solder to excess.

Soldering Iron

IC

4.When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- tip Soldering Iron. (Refer to Fig. 2-8.)

Thin-tip Soldering Iron

IC

 

Fig. 2-8

5.Finally, confirm the soldering status on four sides of the IC using a magnifying glass.

Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering.

NOTE

When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If the bending of leads are repaired, the pattern may be damaged. So, always be sure to replace the IC in this case.

Braided Shield Wire

Fig. 2-7

B2-2

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Contents Colourtelevision Servicing Notices on Checking HOW to Order PartsInsulation Check Procedure Contents System General SpecificationsA3-2 A3-3 A3-4 A3-5 Removal Disassembly InstructionsInstallation Removal and Installation of Flat Package IC B2-2 Confirmation of Hours Used Service Mode ListWhen Replacing Eeprom Memory IC AGC Voltage Electrical AdjustmentsConstant Voltage VCO Coase L1, VCO Fine L1Vertical POSITION/VERTICAL Linearity White BalanceHorizontal Position Vertical SizeNO. Function Contrast CentDynamic Convergence Static Convergence Rough AdjustmentPurity Static ConvergenceMain PCB CRT PCBBlock Diagram Printed Circuit Boards MAIN/CRT Inserted Parts Bshort Printed Circuit Boards MAIN/CRT Chip Mounted PartsMszp SZPAB6 U8OSZP7 V7ED7YOB6D NXWSZP XC6C XC7COC8A XC6B SZPZO C OT7OT8 C4A OC9BTQM SZP E4B4CBD Q8COA8A YTQPA6B OA7CWaveforms 21PIN/AV SW Sound AMP CRT PCB Assy Mechanical Exploded ViewMechanical Replacement Parts List TSB P/N Resistors Electrical Replacement Parts ListJ2-2 CS0RF04L5Z CapacitorsJ2-4 Diodes Coils &TRANSFORMERS SwitchesICS TransistorsMiscellaneous Variable ResistorsBoard Assemblies