HP (Hewlett-Packard) ze4100 ユーザーズマニュアル

 

Service Manual 

Reference Information 

5-3 

TFT display manufacturing is a highly precise but imperfect technology, and manufacturers cannot 
produce large displays that are cosmetically perfect Most, if not all, TFT displays exhibit some level of 
cosmetic imperfection These cosmetic imperfections might be visible to the customer under varying 
display conditions, and can appear as bright, dim, or dark spots This issue is common across all vendors 
supplying TFT displays in their products and is not specific to the notebook display. 

Notebook TFT displays meet or exceed all HP standards for cosmetic quality of TFT displays HP does not 
warrant that the displays will be free of cosmetic imperfections TFT displays can have a small number of 
cosmetic imperfections and still conform to HP’s cosmetic quality specifications. 

Here are some guidelines for determining what action to take on customers’ complaints of cosmetic 
imperfections in their TFT displays: 

1. View the notebook under the customer’s normal operating conditions. 

 

This means that if the customer uses the unit predominately in DOS, in Windows, or in some other 
application or combination of applications, you should make the determination under those same 
applications Self test is not a normal operating condition and is not a sufficient tool for interpreting 
display quality. 

2. Use the table below to determine whether the display should be considered for replacement These are 

the only conditions in this guideline that might call for a replacement due to a defect in material or 
workmanship based on the HP Limited Warranty Statement. 

3. If a display is considered for replacement, make sure the customer understands that cosmetic variations 

might also exist on the replacement display, and might require the customer to use a work-around to 
obscure the cosmetic imperfection. 

4. Customers with cosmetic-based complaints that do not conform to the above conditions and tests will 

not normally be considered for display replacement The HP-responsible person working with the 
customer should identify work-around solutions that are reasonable and appropriate for the individual 
customer Customers who must have a more perfect display solution should consider switching to a 
notebook with a DSTN display. 

We expect that over time the industry will continue to produce displays with fewer inherent cosmetic 
imperfections, and we will adjust our HP guidelines as these improvements are implemented.