Vs, Va Voltage Adjustment - Hitachi 42HDT51M Service Manual

Pt5-g/pw1-h/avc5-u chassis plasma display panel
Table of Contents

Advertisement

4. Vs, Va voltage adjustment

Adjustment part:
-Preparation
1.Turn on the set and perform pre-heat run more than 1 minute with a snow noize screen.
2.Receive full black pattern (blanking level) signal (or Video No signal; in this case,
it will be autmatically turned off after a few seconds because of power save function).
3.Connect voltmeter leads to the Vs or Va and GND test points on power unit.
(Measurement error of voltmeter should be Less than 0.02V)
-Adjustment
(1)Turn VsADJ to adjust Vs voltage to be within 0.1V of the value specified
in the label on the panel. *
(2)Turn VaADJ to adjust Vs voltage to be within
in the label on the panel. *
(3)Reconfirm that Vs voltage remains within 0.1V of the value.Readjust if Itís outside the margin.
Label example*
<LOT>N6
Vs=80.0V
Va=60.0V
V• =140.0V
Vx=60.0V
-Remarks
*1. Permissive level of voltage in case sufficient time of heat-run performed.
Vs: within 0.45V, Va: within
2003ï 3ï 5
TITLE
BACK TO ADJUSTMENTS
1
0.2V of the value specified
1
2
0.55V
Power unit for 42 inch
PIN502• GND
PIN501• VS
VsADJ(on IC591 PWB)
PIN301 vA
VR51• VaADJ(on IC391 PWB)
Power Unit for 55 inch
VsADJ
Vs
Va
VaADJ
GND
27
PT5-G/PW1-H

Hide quick links:

Advertisement

Table of Contents
loading

This manual is also suitable for:

55hdt51mAvc75

Table of Contents