Adjustment - Beko L6B PDP TV Service Manual

1. Application Object
This standard is applied to the PDP42V6#### PDP Module
which is manufactured by the manufacturing team of PDP
promotion department or elsewhere.
2. Notes
(1) Without any special specification, the Module should be at
the condition of preliminaries more than 10minutes before
adjusting.
- Service signal : 100% Full White signal
- Service DC voltage : Vcc: 5V, Va: 65V, Vs: 185V
- DC/DC Pack voltage : Vsetup: 200V, Vscw: 115V,
- Preliminaries environment : Temp
humidity (65!10%)
(2) Module should get the Aging for the equilibrium after finish
the assembling. Aging condition is shown below.
- Service signal: 100% Full White, Red, Green, Blue pattern
signal(Service time of each pattern : within 5minutes/cycle)
- Service DC voltage : Match the voltage with the set up
voltage in the first adjustment.
- Aging time : More than 4Hrs
- Aging environment : Temp (60!2°C), Relative humidity-
Less than 75%
(3) Module adjustment should be followed by below sequence.
- Setting up the initial voltage and adjusting the voltage
wave form of Vsetup
- Measuring the Margin of Vs voltage and deciding the voltage
- Adjusting and checking the voltage of DC/DC pack
(Vsetup, Vscw, -Vy)
- Adjusting the voltage wave form of Vset-down
- Measuring the Margin of Vset-up voltage and deciding the
voltage
- Adjusting the wave form of final voltage
But, these items above can be changed by the
consideration of mass production. (When changing the
sequence, there should be an agreement of the Module
development 2Gr./ QA Gr./ Manufacturing Gr.)
(4) Without any special specification, you should adjust the
Module in the environment of Temp (25!5°C) and Relative
humidity (65!10%)
Caution) If you let the still image more than 10 minutes(especially
The Digital pattern or Cross Hatch Pattern which has
clear gradation), after image can be presented in the
black level part of screen.
3. Adjustment items
3-1. Adjusting the Board Group
(1) Adjusting the voltage wave form of Vset-up
(2) Adjusting the voltage wave form of Vset-down
(3) Adjusting the voltage wave form of Vramp
¥– . Adjustment
-Vy: -75V
(25!5°C), Relative
3-2 Adjustment after assembling
(PDP Module adjustment)
(1) Setting up the initial voltage and adjusting the voltage
wave form of Vsetup
(2) Measuring the voltage Margin of Vs and deciding the voltage
(3) Adjusting and checking the voltage of DC/DC pack
(Vsetup, Vscw, -Vy)
(4) Adjusting the voltage wave form of Vset-down
(5) Measuring the Margin of Vset-up voltage and deciding the
voltage
(6) Adjusting the wave form of final voltage
4. Adjusting the Board Group
(Applying the Jig Set)
4-1. Using Tools
(1) Digital oscilloscope : More than 200MHz
(2) DVM(Digital Multimeter) : Fluke 87 or similar one
(3) Signal generator : VG-825 or similar one
(4) DC power supply
- DC power supply for Vs (1) : Should be changeable more
than 0-200V/ more than 10A
- DC power supply for Va (1) : Should be changeable more
than 0-100V/ more than 5A
- DC power supply for 5V (1) :Should be changeable more
than 0-10V/ more than 10A
- DC-DC Converter Jig (1) : The Jig which has voltage
equivalent output of PDP42V6#### Module after taking
the Vs, Va, 5V voltage
- Voltage stability of power supply : Within !1% for Vs/Va,
within !3% for 5V
4-2. Connection diagram of measuring
instrument and setting up the initial
voltage
(1) Connection diagram of measuring instrument
Refer to Fig. 1.(Connection diagram of measuring
instrument that adjusting the voltage wave form)
(2) Setting up the initial voltage
Initially setting up voltage : Vcc: 5V, Va: 65V, Vs: 185V
But, Initially setting up voltage can be changed by the set
up range according to the Module's characteristic.
4-3. How to Adjust
(1) Adjusting the Voltage Wave form of Vsetup
¤ Connect measuring instrument like the connection
diagram Fig. 1.
¤Ł Turn on the power of the measuring instrument like the
<Caution> item Fig. 1.
¤ØConnect the oscilloscope probe to P4 connecter(80 Pin)
of Y-SUS PCB and GND.
¤Œ Turn the VR1 of Y-SUS PCB and make the "A" wave
form Fig. 2 to be 20!1µs.
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