Philips BDL3221V/00 Service Manual

105Go to cover pageBDL3221 LCD/TV3. Lead-free product identificationYou can identify lead-free product by Philips-lead-free logo on PCB.4. Lead-free product repair instruction4.1 Use only lead-free Solder Alloy 0622 149 00106(1.2mm SAC305) or 0622 14900108(1.0mm SAC305).Remark: For lead free soldering material, please visit website for details. This is recommended by Philips.4.2 Use only adequate solder tools applicable for lead-free soldering-tin. The solder tool must be able to reach at least asolder-temperature of 400 , to stabilize the adjusted temperature at the solder-tip and to exchange solder-tips for different applications.Small Passives/Actives to be removed with thermal tweezersAutomated system for IC and BGA repair (Microscope, Camera, Beam split optics, Computer, Programmer, Heat controllers, Vacuumsystem, Laser pointer) Solder Hand-Tool (Adjustable in temperature height, Temperature shall be held constant,Flexible tips)4.3 Adjust your solder tool so that a temperature around 360 -380 is reached and stabilized at the solder joint.Heating-time of the solder-joint should not exceed ~ 4 sec. Avoid temperatures above 400 otherwise wear-out of tips will rise drasticallyand flux-fluid will be destroyed.Corrosion of Tool-Spikes can be avoided when using SAC305 and a temperature of less than 400 .4.4 Mix of lead-free solder-tin/parts with leaded soldering-tin/parts is possible but not recommended. If not to avoid clean carefully thesolder-joint from old tin and re-solder with new tin.4.5 Use only original spare-parts listed in the Service-Manuals. Standard-material(consumables) can also be purchased at externalcompanies.4.6 Special information for lead-free BGA-ICs: this ICs will be delivered in so-called dry-packaging to protect the IC against moisture andwith lead-free logo on it. This packaging may only be opened shortly before it is used (soldered). Otherwise the body of the IC gets wetinside and during the heating time the structure of the IC will be destroyed due to high (steam-)pressure. If the packaging was openedbefore usage the IC has to be heated up for some hours (around 90 ) for drying (Take attention for ESD-protection!)5. Rework on BGA (Ball Grid Array) ICsGeneralAlthough (LF)BGA assembly yields are very high, there may still be a requirement for component rework. By rework, wemean the process of removing the component from the PWB and replacing it with a new component. If an (LF)BGA isremoved from a PWB, the solder balls of the component are deformed drastically so the removed (LF)BGA has to bediscarded.Device RemovalAs is the case with any component that, it is essential when removing an (LF)BGA, the board, tracks, solder lands, orsurrounding components are not damaged. To remove an (LF)BGA, the board must be uniformly heated to a temperatureclose to the reflow soldering temperature. A uniform temperature reduces the chance of warping the PWB.To do this, we recommend that the board is heated until it is certain that all the joints are molten. Then carefully pull thecomponent off the board with a vacuum nozzle. For the appropriate temperature profiles, see the IC data sheet.Area PreparationWhen the component has been removed, the vacant IC area must be cleaned before replacing the (LF)BGA.Removing an IC often leaves varying amounts of solder on the mounting lands. This excessive solder can be removed witheither a solder sucker or solder wick. The remaining flux can be removed with a brush and cleaning agent. After the boardis properly cleaned and inspected, apply flux on the solder lands and on the connection balls of the(LF)BGANote: Do not apply solder paste, as this has shown to result in problems during re-soldering.Device ReplacementThe last step in the repair process is to solder the new component on the board. Ideally, the (LF)BGA should bealigned under a microscope or magnifying glass. If this is not possible, try to align the (LF)BGA with any board markers.To reflow the solder, apply a temperature profile according to the IC data sheet. So as not to damage neighbouringcomponents, it may be necessary to reduce some temperatures and times.www.alphametals.comMore InformationFor more information on how to handle BGA devices, visit this URL: http://www.atyourservice.ce.philips.com (needssubscription). After login, select Magazine , then go to Workshop Information . Here you will find Information on how.to deal with BGA-ICs.Repair Tips