Sharp Aquos LC-26GD7E, Service Manual

Page: 10 / 97

10
Values specific to each Display
Resetting to "0"
After resetting to "0", perform an operational check to ensure that the lamp error detection feature
is not activated.
Table of contents of adjustment process mode Page 0
4 Lamp error detection
4.1 Feature description
This liquid-crystal colour TV incorporates a lamp error detection feature (lamp error detection) that
automatically turns OFF lamp drivers if one lamp fails.
If anything is wrong with the lamp or lamp circuit or when the lamp error detection failure is activated for
some reason, the following will result: All lamps are switched off the audio remains and green led keeps on.
After switching on and off lamps go on for around 1 sec. until lamp error detected.
4.2 Measures
a)
With lamp error in on mode (green led on) its possible to check the power supply (15 V for lamp
inverters)
b) Test on inverter circuit is only possible in the fi rst moment after switching on until protection circuit
cuts driver signals for all lamps.
A simple test to fi nd out which lamp inverter does not work: Check with oscilloscope the signal direct-
ly on core of inverter transformers.
c) Resetting of lamp error counter
After successful repair of lamps or inverter circuits its helpful to reset the lamp error counter through
service mode: see page 8
For resetting go to LCD adjustments in servicemode. With
T
‚ go to panel service.
Press now fi rst green button and then ok button on remote control (attention: for protection the green button
is not mentioned in on screen menue).
Red panel servicemenue comes up on screen.
Move cursor with
T
down to “L ERR Reset” and move to right side with
X
Press any cursor to reset lamp error to “0”.