Template:Repair Guide/Example: Difference between revisions

Repair Guide/Example
Device
Affects part(s)
Needs equipment
Difficulty
Type

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Latest revision as of 15:58, 28 September 2025

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Problem description

Symptoms

Symptom 1 (Figure 1)
Symptom 2

Solution

Diagnostic Steps

Repair Steps

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+{{stub}}
+{{Repair Guide
+|Device=
+|Affects parts=
+|Needs equipment=
+|Type=
+|Difficulty=
+}}
+== Problem description ==
+<!--
+Provide a concise description of the issue here. Be  as specific as possible to help readers quickly determine whether or not this is the exact problem they are facing.
+ -->
--3662 NO NUMERIC KEYS/CAPS LOCK INVERTED/INPUT DELAY - TOUCHPAD ISSUES
-The device arrived with the numeric keys on the internal keyboard non‐functional, despite a complete keyboard replacement. Visible moisture and sulfation were detected near the keyboard’s SPI controller (U4801).
+[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
+== Symptoms ==
+<!--
+Detail all measurable or observable symptoms in this section.
+-->
+* Symptom 1 (Figure 1)
+* Symptom 2
-🔍 Step-by-Step Diagnosis
+== Solution ==
-Visual inspection: Corrosion was found near the keyboard/trackpad controller area (U4801).
+<!--
+If the issue has a single, specific solution, provide it in this section and delete the sub-headers below. Otherwise, if there are multiple potential causes for the problem, outline the process of identifying the root cause and offer corresponding solutions below.
-Voltage drop across R4814 (relevant resistor in the SPI circuit) was checked and confirmed expected values.
+-->
-Chip replacement attempts:
-First attempt:
-Replaced U4801 with a donor chip from board 820-3476 (MacBook A1502).
-🟡 Result: Keyboard worked, but Caps Lock LED was reversed (lit when lowercase, off when uppercase).
+=== Diagnostic Steps ===
-Second attempt:
-Used a chip from MacBook A1278 (Unibody).
+=== Repair Steps ===
-🔴 Result: Severe input delay and overall poor keyboard behavior.
-Final solution:
-Replaced with U5701 from donor board 820-3332.
-✅ Result: Keyboard fully functional, Caps Lock LED working properly, no delay, trackpad also fully operational.