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After correcting the original service problem, perform the following safety checks before releasing the set to the customer: 1. Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges. 2. Check the interboard wiring to ensure that no wires are “pinched” or contact high-wattage resistors. The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments. 2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. Self Diagnosis Function, Disassembly Guide, stand assy removal, rear cabinet assy removal, Hie board removal, LCD panel removal, adjustments, signal adjustment, PAL auto adjustment, NTSC auto adjustment, white balance adjustment, Troubleshooting, Diagram Schematic Diagrams of A2G BOARD Schematic Diagram of G2 BOARD Schematic Diagrams of G3 BOARD Schematic Diagram of GE2 BOARD Schematic Diagram of H1E BOARD Schematic Diagram of H2 BOARD Schematic Diagram of H3 BOARD. Exploded views, electrical part list. The identification of errors within the WAX chassis is triggered in one of two ways :- 1: Busy or 2: Device failure to respond to IIC. In the event of one of these situations arising the software will first try to release the bus if busy (Failure to do so will report with a continuous flashing LED) and then communicate with each device in turn to establish if a device is faulty. If a device is found to be faulty the relevant device number will be displayed through the LED (Series of flashes which must be counted). No picture (screen is dark) and no sound Check the power cord, antenna, and VCR connection. • The TV is not turned on. Press 1 on the TV (top side). • If the 1 (standby) indicator lights up in red, press “/1. No picture or no menu information from equipment connected to the video input jack.
Tags : sony lcd tv, digital multimeter, rear cabinet, device failure, self diagnosis, earth ground, safety checks, schematic diagrams, schematic diagram, leakage current, klv, power co, splashes, white balance, resistors
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March 7th, 2009 at 10:34 pm
There is obviously a lot to know about this. I think you made some good points here. Thanks!