Sony XBR-55X900H Service Manual page 5

2021/04/27 23:25:57 (GMT+09:00)
1-1. Warnings and Caution
1)CAUTION :These servicing instructions are for use by qualified service personnel
only.
2)To reduce the risk of electric shock, do not perform any servicing other than that contained
in the operating instructions unless you are qualified to do so.
3)WARNING!! : An isolation transformer should be used during any service to avoid
possible shock hazard, because of live chassis. The chassis of this receiver is directly
connected to the ac power line.
The replaceable fuse could be in the neutral of the mains supply. When replacing the fuse,
the mains shall be disconnected for de-energize the phase conductors.
(*Except AC ADAPTOR, Because it does not carry out replacing an internal fuse.)
4) CARRYING THE TV : Be sure to follow these guidelines to protect
avoid causing serious injury :
• Carry the TV with an adequate number of people; larger size TVs require two or more
people.
•Correct hand placement while carrying the TV is very important for safety and to
avoid damages.
5) SAFETY-RELATED COMPONENT WARNING!! : Components identified by shading and
! mark on the exploded views, and in the parts list are critical for safe operation. Replace
these components with Sony parts whose part numbers appear as shown in this manual
or in supplements published by Sony. Circuit adjustments that are critical for safe
operation are identified in this manual. Follow these procedures whenever critical
components are replaced or improper operation is suspected.
6) IMPORTANT REMINDER FOR TV MAINBOARD REPLACEMENT :
It is mandatory for service centers to confirm the TV's system information after each repair
carried out with Mainboard replacement.
SAFETY NOTES
your property and
SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING
S A F E T Y N O T E S
Whenever a TV Main board is replaced, the correct TV Model and Serial number must be
reinserted into memory.
This is a MANDATORY procedure that each service center must apply.
Please refer to the chapter of ADJUSTMENT in this service manual to find out how to set the
model number and serial number in service mode.
1-2. Caution Handling of LCD Panel
When repairing the LCD Panel, make sure you are grounded with a wrist band.
When repairing the LCD Panel on the wall, the panel must be secured using the 4 mounting
holes on the rear cover.
1) Do not press the panel or frame edge to avoid the risk of electric shock.
2) Do not scratch or press on the panel with any sharp objects.
3) Do not leave the module in high temperature or in areas of high humidity for an extended
period of time.
4) Do not expose the LCD panel to direct sunlight.
5) Avoid contact with water. It may cause short circuit within the module.
6) Disconnect the AC power when replacing the backlight (CCFL) or inverter circuit. (High
voltage occurs at the inverter circuit at 650Vrms)
7) Always clean the LCD panel with a soft cloth material.
8) Use care when handling the wires or connectors of the inverter circuit. Damaging the
wires may cause a short circuit.
9) Protect the panel from ESD to avoid damaging the electronic circuit (C-MOS).
SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE
5
SYS SET