Finding Component Locations Fast with Boardview Search

The search box is the most-used part of any boardview viewer. Used well, it takes you from a designator in the schematic to the right pad under the microscope in seconds. Used badly, it leaves you zooming around the board wondering why the part is not where it should be. These are the techniques that make the difference.

Search by reference designator

The designator is the most precise search. Every part has a unique one, and it is the same in the schematic, the boardview and (where printed) the silkscreen.

1. Copy the designator from the schematic: PU301, PC113, PQ7, R512, U23.
2. Paste it into the viewer's search.
3. The viewer centres on the part and highlights it, switching to the correct side in most viewers.

Small details matter. Designators like PQ5A and PQ5B are two halves of one dual MOSFET package in the schematic; the boardview often lists only PQ5. If a search fails, try without the suffix.

Search by net name

Searching a net highlights every pin on it, across both sides of the board. Use it when you want:

• every capacitor on a rail, to check for a short;
• every place a signal reaches, to find a safe probe point;
• the chip that produces a rail, by looking for the inductor and MOSFETs on its output.

Net names are case-sensitive in some viewers and not in others, and special characters (+, #, _) can trip up a search. If +3VALW finds nothing, try 3VALW. If PLTRST# fails, try PLTRST.

Partial matches and wildcards

Most viewers find partial matches, which is useful when:

• you remember only part of a net name — PWROK finds PCH_PWROK, SYS_PWROK and PWROK_EC;
• a net changes name along its path — searching the common part shows every segment;
• you want every part of a type in an area — PC1 lists PC100 to PC199, often grouped around one regulator on Compal designs.

Be careful with very short searches. R1 matches hundreds of parts.

From a pin to its net and back

Clicking a part shows its pins and the net on each one. That is how you answer questions like:

• "Which pin of this regulator is the enable?" — click the IC and read the net names; EN, ON or a _EN net is usually obvious.
• "What does this mysterious 6-pin part connect to?" — click it, read the nets and search them in the schematic.
• "Is this capacitor on the rail I am chasing?" — click either end.

When you need to find a specific pin on the board, note the pin number and the IC's pin 1 marker, which the viewer shows.

From the screen to the board

Finding the part on screen is half the job; finding it on the board is the other half.

1. Match the orientation first. Rotate and flip the view until it matches the board on your bench. Most "it is not there" moments come from a mirrored or rotated view.
2. Use landmarks. Note the nearest large features: a connector, a screw hole, the CPU, a memory slot, a big inductor. Count parts from the landmark if the area is dense.
3. Zoom the viewer to the same scale as your microscope view. It is easier to compare when both show roughly the same area.
4. Check the silkscreen. Where the board has designators printed, confirm you are on the right part before probing.
5. Mark it. A dot of non-conductive marker or a piece of Kapton tape next to a part you will return to saves searching again.

A quick search workflow for common jobs

Example: from schematic to probe in under a minute

You want to check whether the enable pin of the always-on regulator is high. In the schematic, the enable net is called EN_3V5V and has a 100 kΩ pull-up PR120 and a capacitor PC118.

1. Copy PR120 and paste it into the viewer's search. The viewer jumps to the resistor on the top side, next to the regulator.
2. Click the resistor: one pad shows EN_3V5V, the other the input rail. You now know which pad to probe.
3. Note the landmark: the resistor sits between the regulator and the large inductor next to the fan connector.
4. Under the microscope, find the inductor, then the regulator, then the small resistor between them, and probe the EN_3V5V side.

The whole sequence takes well under a minute, and you never touched a pin of the regulator itself. Repeating this pattern — designator, click, landmark, probe — is what makes boardview work fast.

Searching when you have no schematic

Without a schematic, net names become your guide. Many boardviews carry the designer's net names, which are usually descriptive enough to work from:

• names with PWROK, PGOOD or PG are power-good signals;
• names ending in _EN or _ON are enables;
• names starting with + or PP are rails.

Searching these words lists the control signals of the board even without the schematic. Combined with datasheets for the main power chips, that is often enough to diagnose a power fault.

Making search part of the schematic workflow

The most efficient routine combines both documents: read the schematic to decide what to check, search the boardview to find it, measure, and repeat. The full method is in How to Use a Schematic and a Boardview Together. If you have not set up a viewer yet, start with OpenBoardView: Installation and First Steps.

When search does not find what you expect

• The file is for another revision. The designator may not exist or may be elsewhere. See How to Match a Boardview to Your Board Revision.
• The part is not fitted. Boardviews show every footprint, fitted or not; the schematic's option markers tell you which.
• The format lost some data. Converted or partial files sometimes miss nets or parts. Try another format of the same board.
• Naming differs between documents. Rare, but some boardviews abbreviate long net names. Search for a distinctive part of the name.

Keyboard habits that save time

Every viewer has its own shortcuts, listed in its help screen. Learn three of them early: open search, flip the board, and reset the view. Combined with copy and paste from the schematic, those three cover most of a day's work.

FAQ

Why does searching a designator take me to the wrong side?

Some viewers jump to the part but do not flip the view automatically. Check the side indicator and flip if needed.

Can I search for component values, like all 22 µF capacitors?

Only if the boardview contains values, and many do not. The schematic or a BOM is a better source for that kind of search.

Why does a net search highlight pins I did not expect?

Rails are large; a rail like +3VALW can reach dozens of parts across the board. That is normal and is exactly why net highlighting is useful when hunting shorts.

Do all viewers support partial matches?

Most do. If yours does not, search for the full name from the schematic, including prefixes and special characters.

Bottom line

Search designators for precision, net names for overview and partial names when you are not sure. Match the view orientation to the board before you look for the part, use landmarks to find it under the microscope, and mark what you will come back to.