HP Pavilion xf300 Series, Troubleshooting And Self-Repair Manual

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Reference Information 

ze1000 Series Troubleshooting and Self-Repair Guide 

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

4.  Displays with cosmetic imperfections 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-arounds that are reasonable and appropriate for that customer. 
Customers who require 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. 

Type of Imperfection 

Imperfections Not Allowed 

Electrical Imperfections: 

Bright dots 

(a) 

Dark dots 

(a)

• 

7 or more single bright dots. 

• 

7 or more single dark dots. 

• 

9 or more total (bright and dark combined) defective dots. 

• 

Any occurrence of multiple defective dots within 15 mm. 

Mechanical Imperfections: 
Discoloration 
Polarizer bubbles, dents 

(b)

• 

Any polarizer bubble, discoloration, or dent that is visible from at least 
36 cm (14 in). 

Definitions of imperfections: 

a

  A bright or dark dot is a subpixel (red, green, or blue dot) that is stuck on or off. 

b

  A polarizer dent or bubble is a light spot with a darker border that appears on a lighted display and does 

not change size. In contrast, a polarizer scratch is a light line that is visible on a darker background and 
does not change size.