acer KG251Q Smart Monitor User Manual

acer KG251Q Smart Monitor

Safety Notice

Any person attempting to service this chassis must familiarize with the chassis and be aware of the necessary safety precautions to be used when serving electronic equipment containing high voltage

Important Safety Notice

Product Announcement:
This product is certificated to meet RoHS Directive and Lead-Free produced definition. Using approved critical components only is recommended when the situation to replace defective parts. Vender assumes no liability express or implied, arising out of any unauthorized modification of design or replacing non-RoHS parts. Service providers assume all liability.

Qualified Repairability:
Proper service and repair is important to the safe, reliable operation of all series products. The service providers recommended by vender should being aware of notices listed in this service
manual in order to minimize the risk of personal injury when perform service procedures. Furthermore, the possible existed improper repairing method may damage equipment or products. It is recommended that service engineers should have repairing knowledge, experience, as well as appropriate product training per new model before performing the service procedures.

NOTICE:

• To avoid electrical shocks, the products should be connect to an authorized power cord, and turn off the master power switch each time before removing the AC power cord.
• To prevent the product away from water or explosed in extremely high humility environment.
• To ensure the continued reliability of this product, use only original manufacturer’s specified parts.
• To ensure following safety repairing behavior, put the replaced part on the components side of PWBA, not solder side.
• To ensure using a proper screwdriver, follow the torque and force listed in assembly and disassembly procedures to screw and unscrew screws.
• Using Lead-Free solder to well mounted the parts.
• The fusion point of Lead-Free solder requested in the degree of 220°C.

Exploded Diagram

Product Exploded Diagram

Wiring connectivity diagram

There are two types of wiring diagrams for model KG251Q. The wiring connectivity position will be different according to the ACTUAL PCBA connector position. Please base on different SKU refer to below diagram.
NOTE: INF BD= Interface Board, PWR BD=Power Board, CTRL BD= Control Board

1. SKU with USB.
2. SKU without USB.

Mechanical Instruction

Tools Required
List the type and size of the tools that would typically can be used to disassemble the product to a point where components and materials requiring selective treatment can be removed.

Tool Description:

• working table
• Screw-driver: Philips-head screwdriver, Hex-head screwdriver
• Knife
• glove
• cleaning cloth
•  ESD protection

Disassembly and Assembly SOP

Disassembly Procedures

Preparation before disassemble

1. Clean the room for disassemble
2. Identify the area for monitor
3. Check the position that the monitors be placed and the quantity of the monitor ;prepare the area for material flow; according to the actual condition plan the disassemble layout
4. Prepare the implement, equipment, materials as bellow:
5. working table
6. Screw-driver: Philips-head screwdriver, Hex-head screwdriver
7. knife
8. glove
9. cleaning cloth
10. ESD protection

Note : After unplugging the power cord, the power board still have power energe. Please pay attention when disassembling/assembling.

S1: Disassemble the RC, stand and base
Before Disassembling & Assembling, monitor need to be put on the sponge and the Insulation glove must be wore during the process.
Disassemble base and column from the RC(Rear Case).
Unlock RC center screw and as picture 2.
Disassemble RC from monitor.

S2: Disassemble MF and Trim
Unlock 8 MF screws and 2 trim screws as picture 1. Disassemble all tapes, lamp wire and LVDS as picture 2.

S3: Disassemble CTRL BD
Tear off CTRL FFC from P/BD and disassemble CTRL BD from Trim

S4 Disassemble I/F BD and P/BD from SHD.
Disassemble SHD from panel and unlock 5 PCBA screws.
Tear off mylar, extract P/BD wire from the IF BD, disassemble the IF BD from the SHD, and extract the FFC from the IF BD.
Disassemble the P/BD from the SHD and extract P/BD wire from the P/BD.

S5 Disassemble SPK.
Tear off 1 tape and disassemble speakers.

NOTE: Circuit boards >10 cm² has been highlighted with the yellow rectangle as above image shows. Please detach the Circuit boards and follow local regulations for disposal.

Assembly Procedures

Preparation before assemble:

1. Clean the room for work
2. Identify the area for material
3. Prepare the implement, equipment, materials as bellow：
4. working table
5. Screw-driver: Philips-head screwdriver, Hex-head screwdriver
6. Knife
7. Glove
8. Cleaning cloth
9. ESD protection

Note : After unplugging the power cord, the power board still have power energe. Please pay attention when disassembling/assembling.

S1 Assemble SPK
Before Disassembling & Assembling, monitor need to be put on the sponge and the Insulation glove must be wore during the process.
Put the SHD on the worktable. Assemble speaker and stick 1 tape.

S2 Assemble I/F BD and P/BD from SHD.
Insert P/BD Wire to P/BD and assemble the P/BD to the SHD.
Insert the FFC wire and P/BD wire to the IF BD and assemble the IF BD to the SHD. Lock 5 PCBA screws and stick 1 mylar to fasten the wires.

S3 Assemble Panel to MF
Take the Panel, insert lamp wire to panel marked as red frame. Assemble the MF to the panel ,and lock 8 screws to the MF as the picture

S4 Assemble CTRL BD
Assemble Crel FFC to Ctrl BD and put them into trim, then lock 2 trim screws

S5 Assemble SHD
Locate the SHD, insert lamp wire to P/BD. Insert FFC Ctrl to PCBA and insert LVDS to Panel

S7 Assemble the RC, stand and base
Assemble the RC to the MF and Lock 1 screw as picture 1. Assemble the column and base on the RC as picture 2.

NOTE: Circuit boards >10 cm² has been highlighted with the yellow rectangle as above image shows. Please detach the Circuit boards and follow local regulations for disposal.

TROUBLESHOOTING

Before sending your LCD monitor for servicing, please check the trouble- shooting list below to see if you can self-diagnose the problem. (VGA Mode)

No Picture

|

LED ON

|   Using OSD, adjust brightness and contrast to maximum or reset to their default settings.

LED OFF

|   Check the power switch.
 Check if AC power cord is properly connected to the monitor.

LED displays amber color

|  Check if video signal cable is properly connected at the back of monitor.
 Check if the power of computer system is ON.

Abnormal Picture

|

Unstable Picture

|  Check if the specification of graphics adapter and monitor is in compliance which may be causing the input signal frequency mismatch.

Display is missing, center shift, or too small or too large in display size

|   Using OSD, adjust RESOLUTION, CLOCK, CLOCK-PHASE, H-POSITION and V-POSITION with non-standard signals.
  Using OSD, in case of missing full-screen image, please select other resolution or other vertical refresh timing.

Using OSD, in case of missing full-screen image, please select other resolution or other vertical refresh timing.

Wait for a few seconds after adjusting the size of the image before changing or disconnecting the signal cable or powering OFF the monitor.

Abnormal Sound (Only Audio-Input model) (Optional)|

No sound, or sound level is too low

|  Check the audio cable with the host PC is connected.
  Check if the volume setup of the host PC is in minimum position and try to raise the volume level.

(HDMI/DP Mode)

No Picture

|

LED ON

| Using OSD, adjust brightness and contrast to maximum or reset to their default settings.

LED OFF

| Check the power switch.
  Check if AC power cord is properly connected to the monitor.

LED displays amber color

|   Check if video signal cable is properly connected at the back of monitor.
Check if the power of computer system is ON.
Abnormal Sound (Only Audio-Input model) (Optional)|

No sound, or sound level is too low

| Check the audio cable with the host PC is connected.
Check if the volume setup of the host PC is in minimum position and try to raise the volume level.

FRU List

This chapter gives you the FRU (Field Replaceable Unit) listing in global configurations of ACER KG251Q. Refer to this chapter whenever ordering for parts to repair or for RMA
(Return Merchandise Authorization).
Please note that WHEN ORDERING FRU PARTS, you should c heck the most up-to- date information available on your regional web or channel. For whatever reasons a part number change is made, it will not be noted on the printed Service Guide. For AUTHORIZED SERVICE PROVIDERS, your office may have a DIFFERENT part number code from those given in the FRU list of this printed Service Guide. You MUST use the local FRU list provided by your regional office to order FRU parts for repair and service of customer machines
NOTE: T o scrap or to return the defective parts, you should follow the local government ordinance or regulations on how to dispose it properly, or follow the rules set by your regional office on how to return it.

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