HP P21b G4 Monitor Maintenance and Service Guide
Summary
This comprehensive service manual is essential documentation for trained technical personnel maintaining the HP P21b G4 display monitor. It provides detailed instructions covering safety precautions, advanced removal and replacement procedures, illustrated parts catalogs, functional testing guides, and extensive troubleshooting steps. Whether ordering specific components or diagnosing operational issues, this guide ensures reliable servicing and optimal performance for authorized service professionals.
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Maintenance and Service Guide
P21b G4 model
SUMMARY This guide provides information about spare parts, removal and replacement of parts, diagnostic tests, problem troubleshooting, and more.
Page Summary Contents For HP P21b G4 Monitor Maintenance and Service Guide
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Maintenance and Service Guide P21b G4 model SUMMARY This guide provides information about spare parts, removal and replacement of parts, diagnostic tests, problem troubleshooting, and more.
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Product notice © Copyright 2020 HP Development Company, L.P. Only trained service personnel familiar with this product should service it. Before AMD is a trademark of Advanced Micro performing any mai...
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Table of Contents 1 Getting started .............................................................................................................................................. 1 Important safety ...
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1 Getting started Read this chapter to learn about safety information and where to find additional HP resources. Important safety information Carefully read the cautions and notes within this document...
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● If you must replace a capacitor, insert new parts carefully to avoid a short circuit caused by the near pin. ● Do not get the board wet. Water and moisture can cause a short circuit that causes malf...
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2 Monitor features This chapter provides an overview of the monitor’s features. Features Depending on the model, your monitor might include the following features: ● 52.6 cm (20.7-inch) diagonal viewa...
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Front components To identify the components on the front of the monitor, use this illustration and table.
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Rear components To identify the components on the rear of the monitor, use this illustration and table.
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Locating the serial number and product number The SPEC label (1) and Barcode label (2) are located on the rear of the monitor. The serial number and product number are located on a Safety label. You m...
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For India:
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3 Illustrated parts catalog To identify the monitor major components, use this illustration and table.
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How to order parts The HP authorized repair center can purchase the power board from HP. Power board Description HP spare part number Manufacturer part number PSU P21b G4, 21204-00942- Capacitors Conn...
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4 Removal and replacement procedures Adherence to these procedures and precautions is essential for proper service. Preparation for disassembly Use this information to properly prepare to disassemble ...
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1) Remove the base. Push the button of base to unlock the base, then pull out the base form the stand. 2) Remove the stand. Push the button of stand to unlock the stand, then pull out the stand form t...
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3) Remove the rear cover. Remove the screws that lock the rear case and use the knife to remove the case. 4) Remove shielding case/cables. Remove the acetate tape (red frame) that fixes the wire and t...
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5) Remove KB from rear cover. Take the function key board out of the front frame, remove the tab on the function key board, and pull out the function key wire. 6) Remove speaker. Remove the acetate ta...
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7) Remove M/B &P/B from shielding case. Remove the screws*4 fixing the power board, screws*2 fixing the mainboard and remove the conductive foam and acetate tape. Remove the screws at the mainboar...
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Power board The power board part number is 21204-00942. Before removing the power board, follow these steps: ▲ Prepare the monitor for disassembly. Remove the power board: 1) The HP P21b G4 power boar...
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Connector repair This procedure includes HDMI, VGA connectors. The connectors are on the main board (board part number 60104-09633). The connectors identifiers are as follows: Connector Location HDMI ...
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HDMI connector P108 Repair the HDMI connector: 3) Use a soldering iron and a desoldering pump to remove as much solder as possible from the pin. 4) Use a hot air gun to melt the solder on the pins. 5)...
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9) Lift the P103 connector from the PCB. 10) Place the new component on the PCB. Be sure that it matches the PCB footprint. 11) Solder the new component.
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Function test After repair, be sure to confirm that all functions are working. Table 4-1: Function test Test item Operating description Tool used HDMI test Confirm whether image displays and sound Com...
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while you connect the video cable. Input Signal Video resolution and/or refresh rate are set Change the settings to a Out of Range is higher than what the monitor supports. supported setting. displaye...
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Index components precautions, 1 front, 4 preparation for disassembly, 10 rear, 5 RC removal, 12 connector repair, 14 rear components, 5 features, 3 removal firmware updates, 2 power board, ...
Manual Details
| Brand | HP |
|---|---|
| Pages | 24 |
| File Size | 1.51 MB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What should I do before performing any maintenance work?
Only trained service personnel familiar with this product are authorized to service it, and you must carefully read all cautions and notes.
How do I resolve an unclear or indistinct image on the screen?
Open the OSD menu and adjust the brightness scale as needed until the image appears clear.
What steps should I take if my monitor displays 'Out of Range'?
Check and change the video signal settings, as they are currently set higher than what the monitor supports.
Where can I find information on ordering replacement parts?
Consult the illustrated parts catalog to identify components, then follow instructions located in the 'How to order parts' section.