Electrical Instructions - Philips HP L2035 Service Manual

1. General points
1.1 During the test and measuring, supply a distortion free AC
mains voltage to the apparatus via an isolated transformer with
low internal resistance.
1.2 All measurements mentioned hereafter are carried out at a
Normal mains voltage (90 - 132 VAC for USA version, 195 -264
VAC for EUROPEAN version, or 90 - 264 VAC for the model with
full range power supply, unless otherwise stated.)
1.3 All voltages are to be measured or applied with respect to
Ground, unless otherwise stated.
Note: don't use heat-sink as ground.
1.4 The test has to be done on a complete set including LCD panel
in a room with temperature of 25 +/- 5 degree C.
1.5 All values mentioned in these test instruction are only applicable
of a well aligned apparatus, with correct signal.
1.6 The letters symbols (B) and (S) placed behind the test
instruction denotes (B): carried out 100% inspection at
assembly line
(S): carried out test by sampling
1.7 The white balance (color temperature), has to be tested in
subdued lighted room.
1.8 Repetitive power on/off cycle are allowed.
1.9 All optical characteristics (including WHITE-D, Brightness, and
so on) are determined according to panel specification after
warming up approximate 30 minutes that brightness stability is
optimal, and follow strictly after panel specification.
2. Input signal
Signal Type
2.1.1 Analog Video: 0.7 Vp-p linear, positive polarity
Sync. : TTL level, separate, positive or negative polarity
Signal source : pattern generator format as attachment.
( Table 1 to 47 ) Reference generator : Quantumdada 802G
2.1.2 Digital Video : 600m Vp-p TMDS signal
2.1.3 CVBS Video : 1Vp-p, 75Ohm
2.1.4 S-Video : Y-1 Vp-p, 75 Ohm
C-0.3V p-p, 75 Ohm
2.2 Input signal Mode
Item H.Freq. Mode
(KHz)
1 31.469 IBM VGA 3H
2 31.469 IBM VGA 12H
3
VESA
37.500
4
43.27
VESA
5
37.879
VESA
6
53.67 VESA
7
49.700
MACINTOSH
8
48.363
VESA
9
60.023
VESA
10
68.68 VESA
11
MACINTOSH
68.700
12
SUN WS
61.80
13 VESA
60.00
14
63.981
VESA

Electrical instructions

3.AC Power Board
3.0 Detach 1102 from the scalar board.
3.1.1
3.1.2
3.2 Over Voltage protection test
3.2.1
3.2.2
3.2.3
3.2.4
3.3
3.3.1
3.3.2
3.4 Short Circuit protection test
Resolution V.Freq.
3.4.1
(Hz)
3.4.2
720x400 70.087
3.4.3
640x480 59.940
stable.
640x480
75.000
4.01
85.01
640x480
4.02
60.317
800x600
4.03
85.06
800x600
4.05
832x624
75.000
60.004
1024x768
75.029
1024x768
85.00
1024x768
1152x870 75.000
1152x900
65.96
1280x960 60.00
1280x1024 60.020
15 79.976 VESA
91.1
16
VESA
17
VESA
75.0
18
VESA
93.8
Check the O/P (output) voltage within 18 +/- 0.9 VDC, 3.3+/-0.15VDC
and the start up circuit
Set AC input at 264/90 V, add 3.1A loading to C2118 and DC O/P
voltage is 18 +/- 0.9V, Add1A load to C2003 and DC O/P voltage is
3.3V+/-0.15VDC (B)
Check switching frequency at 6112 Anode is 60KHz~175KHz at
normal load,17KHz +/- 3KHz at no load condition. (S)
If an over-voltage fault on the adapter output, the adapter should be
shut down before the output voltage exceeds 23V.
Set the AC I/P : 264VAC.
Add a resistor 47Kohm in parallel with the 3131. (B)
Then the O.V.P. circuit should be activated before the output of the
adapter over 23V (B)
Take off the resistor 47Kohm and discharge C2118, the O/P should be
:18V +/-0.9V. (B)
Over load protection test
Set I/P AC power input at 264VAC
Rise the 18VDC output current higher than 5 Amp. The adapter
should be shut down before 7 Amp.(B)
Set AC input at 264V, O/P is 18V/3.33A.
Short 18VDC O/P, the I/P power consumption is less than 5 W. (B)
Open the short circuit, the 18VDC output should be resolved and
4.0DC/DC power supply
Detach 1102 to the scaler board before testing the function.
Apply 1.3Amp load to 3.3V at C2003 (B)
Check frequency at 6001 is 240KHz +/- 15KHz
Check voltage at C2003 should be within the range 3.3V +/-
0.15V (B)
HP L2035
15
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75.025
1280x1024
1280x1024
85
1600x1200
60
1600 x1200 75
(B)
(S)