Troubleshooting; Triage Worksheets; Troubleshooting Flowcharts - Sony KDL-26S3000 Training Manual

Troubleshooting

The WAX3 chassis is serviced at board level. Warranty repairs require
mandatory board level repair unless a specific bulletin is issued calling
for the replacement of an individual component. Because of this,
troubleshooting flowcharts will be utilized in this manual to assist in
diagnosing and repairing the unit. The preferred method is to "triage" the
unit by listening to the customer's description of the symptoms when a
service request is made. This can be done by technical or non-technical
staff by utilizing the triage worksheet included in this section.
Once the correct part (or parts) is identified during the triage procedure, the
technician can use the flowcharts in the field to perform further diagnosis
of the unit. This is especially useful when more than one part is suspected
as being the cause. The flowcharts are designed to use visual checks, the
use of internal graphic patterns, and in the worst case, the use of a DVM to
check voltages or resistance levels. These quick checks are much quicker
than trying to repair the unit using the "shotgun" method.

Triage Worksheets

The triage worksheets in the following pages are an example of a useful
tool to aid in determining what part(s) may be needed to be brought to the
repair site to complete a repair. Based on a description of the symptom
by the customer, one can simply go down the column that best fits the
description of the failure and locate what is needed for the repair.
The part that is most likely to repair the failure is marked with a dot. In
some cases there may be more than one part with a dot. In this situation
it is highly recommended to bring both parts to the repair location. Parts
marked with a triangle may also be the cause and the decision on whether
to bring them will need to be determined based on various situations such
as distance to the repair site and the size of the unit (can it easily be
brought to the shop if needed).
Bear in mind that the worksheet illustrated is updated with correct part
numbers and suggested parts as of the writing of this manual but may
be updated as part numbers change due to production changes in the
product and the suggestion list may change as feedback is received from
CTV-41
Chapter 2 - Service and Troubleshooting
the field on what part is more likely to repair the problem. Always visit
the Sony service website to obtain the latest triage worksheet that will be
constantly updated and to view any service bulletins or repair tips to assist
in the repair.

Troubleshooting Flowcharts

The flowcharts in the remainder of this chapter are designed for the
technician who is servicing the unit in the field. They are particularly useful
when more than one part is brought to the location. Visual checks, use
of internal graphics patterns and voltage checks will assist in determining
which part is likely to complete the repair. As with the triage worksheet,
please check the Sony service website to see if the flowcharts have been
updated with new information to assist in the diagnosis of the unit. The
triage worksheets on the website will always have the latest flowcharts
included.
38