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LG E2042T-BN Инструкция по эксплуатации онлайн [5/20] 80496
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- 5 -
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and
appropriate tip size and shape that will maintain tip
temperature within the range or 500F to 600F.
2. Use an appropriate gauge of RMA resin-core solder
composed of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a
mall wire-bristle (0.5 inch, or 1.25cm) brush with a
metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal
temperature.
(500F to 600F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static,
suction-type solder removal device or with solder
braid.
CAUTION: Work quickly to avoid overheating the
circuitboard printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal
temperature (500F to 600F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of
the component lead and the printed circuit foil, and
hold it there only until the solder flows onto and
around both the component lead and the foil.
CAUTION: Work quickly to avoid overheating the
circuit board printed foil.
d. Closely inspect the solder area and remove any
excess or splashed solder with a small wire-bristle
brush.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong)
through which the IC leads are inserted and then bent flat
against the circuit foil. When holes are the slotted type,
the following technique should be used to remove and
replace the IC. When working with boards using the
familiar round hole, use the standard technique as
outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation
by gently prying up on the lead with the soldering iron
tip as the solder melts.
2. Draw away the melted solder with an anti-static
suction-type solder removal device (or with solder
braid) before removing the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad
and solder it.
3. Clean the soldered areas with a small wire-bristle
brush. (It is not necessary to reapply acrylic coating to
the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as
close as possible to the component body.
2. Bend into a "U" shape the end of each of three leads
remaining on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the
corresponding leads extending from the circuit board
and crimp the "U" with long nose pliers to insure metal
to metal contact then solder each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor
leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the
circuit board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close
as possible to diode body.
2. Bend the two remaining leads perpendicular y to the
circuit board.
3. Observing diode polarity, wrap each lead of the new
diode around the corresponding lead on the circuit
board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder
joints of the two "original" leads. If they are not shiny,
reheat them and if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board
hollow stake.
2. Securely crimp the leads of replacement component
around notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the
replaced component and adjacent components and the
circuit board to prevent excessive component
temperatures.
Copyright
Only for training and service purposes
LGE Internal Use Only
2010 LG Electronics. Inc. All right reserved.
Содержание
- Caution 1
- Chassis no lm12a 1
- Color monitor service manual 1
- E2042t 1
- E2042t a 1
- Adjustment 14 2
- Block diagram 11 2
- Contents 2
- Description of block diagram 2 2
- Disassembly 9 2
- Exploded view 0 2
- Precautions 4 2
- Replacement parts list 2 2
- Schematic diagram 26 2
- Specifications 2
- Specifications 2 2
- Timing chart 8 2
- Troubleshooting guide 16 2
- Wiring diagram 19 2
- Caution 3
- Leakage current hot check circuit 3
- Precaution 3
- Warning 3
- Servicing precautions 4
- Timing chart 7
- Disassembly set 8
- Place the monitor face down on the cushion or soft cloth 8
- Remove the stand body and atand base from the product 8
- Boost converter of led block converters 19v to 41v and operates back light led strings of module in e2042t case 10
- Description of block diagram 10
- Adjustment 11
- A clear eti to initialize using time c auto color w b balance and automatically sets the gain and offset value press key for over 3 sec d aging select aging mode on off b module to select applied module d nvram init eeprom initialize 24c16 press key for over 3 sec e r g b 9300k allows you to set the r g b 9300k value manually f r g b 6500k allows you to set the r g b 6500k value manually g r g b offset allows you to set the r g b offset value manually analog only h r g b gain allows you to set the r g b gain value manually analog only 12
- Copyright 12
- Figure 1 cable connection 12
- Only for training and service purposes lge internal use only 2010 lg electronics inc all right reserved 12
- Service osd 12
- The svc osd menu contains additional menus that the user osd menu as described below 12
- Turn off the power switch at the right side of the display 12
- Wait for about 5 seconds and press menu power switch for 1 second interval 12
- Check ic103 pin 42 43 13
- Ic102 pin3 5v 13
- No power 13
- Troubleshooting guide 13
- Waveforms 13
- No raster osd is not displayed main 14
- Trouble in dpm 15
- Waveforms 15
- Ead 61426311 16
- Lgd ead61905269 16
- Main board 16
- Wiring diagram 16
- Mfl67122143 20
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