Cant Draw Diagonal Lines After Screen Replacement: Difference between revisions

Cant Draw Diagonal Lines After Screen Replacement
Device	Xbox One X
Affects part(s)	Motherboard
Needs equipment	Multimeter
Difficulty	◉◉◉◌ Hard
Type	Soldering

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Revision as of 20:58, 14 September 2025

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Problem description

This guide will go over diagnosing the a Xbox One X with no signs of life.

Symptoms

The device does not turn on

Solution

There are 2 things that can cause a no power issue on the Xbox One X the Power Supply or a problem on the Motherboard.

Diagnostic Steps

The first thing to check is if the power supply is producing 12V, if 12V are not present this can be due to a faulty power supply or a short on the motherboard stopping the power supply from creating the 12V line.

If 12V are present the next thing to check is if the 5V Standby is present.

If 5V is present the next thing to do check the 1.1V, 3,3V and 1.8V lines

If these voltages are all Standby voltages are present the issue may be the Southbridge IC.
If 3.3V is missing this may be due to a faulty U54, check for shorts around this ic made sure the 1.8VSTBY is present, the U54 will not turn on without 1.8V.
A common issue to have is 2.4V on the 3.3V line, 0.44V on 1.8V the HDMI retimer IC is the cause for this, you can test it by removing it from the board the console will turn on and then off without the Retimer.

Repair Steps

If 12V are not present remove the PSU in diode mode measure the Positive side of the PSU terminal on the motherboard it should have a high reading between 0.400 and 0.500, if ok replace the Power Supply.

If you get a reading of 0.000 it means there is a short on the 12V check the Short Circuits page on a guide on how find the short.

If 5V is not present on the Motherboard this is probably due to a short on this line once again with your multimeter in diode mode measure the line and check if the value is high, it is common to have a short on a random cap in this line, If you do have a short on a capacitor you check with schematics the value to replace it.

If 3.3V STBY is not present replace the U54 IC(TPS56C215)

If 3.3V and 1.8V lines are lower then expected replace the Retimer IC U29 (TDP158).

To replace any of these chips falow the steps bellow

Replacing the chip

Desoldering the Old Chip:

Apply heat to the chip from above using a hot air station or soldering iron. Heat for several seconds until the factory solder begins to melt.
Gently nudge the chip with tweezers. If it moves, it’s ready to be lifted off.
While the board is still hot, use solder wick and a soldering iron to clean old solder from the motherboard pads.

Preparing the Motherboard and New Chip:

Apply a thin layer of new solder to the cleaned motherboard pads. Avoid excess solder, especially in the center square.
Pre-tin the pads of the new chip with a small amount of solder to ensure good contact.

Soldering the New Chip:

Align the new chip on the motherboard. Match the dot on the chip to the small triangle marker on the motherboard for correct orientation.
Heat the chip from above using a hot air station. Watch for the solder to melt, indicated by slight chip movement.
Gently touch the chip with tweezers to let surface tension settle it into place. Avoid excessive force.

Inspection and Cleanup:

Inspect all connections under a microscope . Ensure there are no solder bridges between pins.
If any connections look faulty, gently touch the affected pad with a soldering iron to reflow and correct.

Final Testing

After assembling the console, ensure every function is working as expected.

If you replaced the Retimer IC mare sure the console is able to output image in 4K.

@@ Line 1: / Line 1: @@
+{{stub}}
+{{Repair Guide
+|Device=Xbox One X
+|Affects parts=Motherboard
+|Needs equipment=Multimeter
+|Type=Soldering
+|Difficulty=3. Hard
+}}
+== 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.
+ -->
-'''820-3662 NO NUMERIC KEYS / CAPS LOCK INVERTED / INPUT DELAY - TOUCHPAD ISSUES'''
+This guide will go over diagnosing the a Xbox One X with no signs of life.
+== Symptoms ==
+<!--
+Detail all measurable or observable symptoms in this section.
+-->
+* The device does not turn on
-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).
+== Solution ==
+<!--
+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.
-🔍 '''Step-by-Step Diagnosis'''
+-->
-Visual inspection: Corrosion was found near the keyboard/trackpad controller area (U4801).
+There are 2 things that can cause a no power issue on the Xbox One X the Power Supply or a problem on the Motherboard.
-Voltage drop across R4814 (relevant resistor in the SPI circuit) was checked and confirmed expected values.
+=== Diagnostic Steps ===
-'''''Chip replacement attempts:
+* The first thing to check is if the power supply is producing 12V, if 12V are not present this can be due to a faulty power supply or a short on the motherboard stopping the power supply from creating the 12V line.
-'''
+[[File:Xbox One X 12V input.png|center|thumb|Xbox One X 12V input]]
+* If 12V are present the next thing to check is if the 5V Standby is present.
-'''First attempt:'''
+* If 5V is present the next thing to do check the 1.1V, 3,3V and 1.8V lines
+[[File:Xbox One X STBY voltages.png|center|thumb|Xbox One X STBY voltages]]
+* If these voltages are all Standby voltages are present the issue may be the Southbridge IC.
+* If 3.3V is missing this may be due to a faulty U54, check for shorts around this ic made sure the 1.8VSTBY is present, the U54 will not turn on without 1.8V.
+*A common issue to have is 2.4V on the 3.3V line, 0.44V on 1.8V the HDMI retimer IC is the cause for this, you can test it by removing it from the board the console will turn on and then off without the Retimer.
+[[File:Xbox One X Retimer IC .png|center|thumb|629x629px|Xbox One X Retimer IC ]]
-Replaced U4801 with a donor chip from board 820-3476 (MacBook A1502).
+== Repair Steps ==
+If 12V are not present remove the PSU in diode mode measure the Positive side of the PSU terminal on the motherboard it should have a high reading between 0.400 and 0.500, if ok replace the Power Supply.
-🟡 Result: Keyboard worked, but Caps Lock LED was reversed (lit when lowercase, off when uppercase).
+If you get a reading of 0.000 it means there is a short on the 12V check the [[Short Circuits - Repair Basics|Short Circuits]] page on a guide on how find the short.
-'''Second attempt:'''
+If 5V is not present on the Motherboard this is probably due to a short on this line once again with your multimeter in diode mode measure the line and check if the value is high, it is common to have a short on a random cap in this line, If you do have a short on a capacitor you check with schematics the value to replace it.
-Used a chip from MacBook A1278 (Unibody).
+If 3.3V STBY is not present replace the U54 IC(TPS56C215)
-🔴 Result: Severe input delay, no trackpad and overall poor keyboard behavior.
+If 3.3V and 1.8V lines are lower then expected replace the Retimer IC U29 (TDP158).
-'''Final solution:'''
+To replace any of these chips falow the steps bellow
-Replaced with U5701 from donor board 820-3332.
+==== Replacing the chip ====
+Desoldering the Old Chip:
-✅ Result: Keyboard fully functional, Caps Lock LED working properly, no delay, trackpad also fully operational.
+* Apply heat to the chip from above using a hot air station or soldering iron. Heat for several seconds until the factory solder begins to melt.
+* Gently nudge the chip with tweezers. If it moves, it’s ready to be lifted off.
+* While the board is still hot, use solder wick and a soldering iron to clean old solder from the motherboard pads.
+Preparing the Motherboard and New Chip:
-'''⚙️ Technical Conclusion'''
+* Apply a thin layer of new solder to the cleaned motherboard pads. Avoid excess solder, especially in the center square.
+* Pre-tin the pads of the new chip with a small amount of solder to ensure good contact.
-The U4801/U5701 keyboard SPI controller contains firmware/configuration specific to each board model. These chips are not freely interchangeable between different MacBook series (A1278, A1502, A1398, etc.).
+Soldering the New Chip:
-⚠️ '''Using an incompatible IC can cause:'''
+* Align the new chip on the motherboard. Match the dot on the chip to the small triangle marker on the motherboard for correct orientation.
+* Heat the chip from above using a hot air station. Watch for the solder to melt, indicated by slight chip movement.
+* Gently touch the chip with tweezers to let surface tension settle it into place. Avoid excessive force.
-Reversed Caps Lock LED logic.
+Inspection and Cleanup:
-Noticeable input delay on keys input.
+* Inspect all connections under a microscope . Ensure there are no solder bridges between pins.
+* If any connections look faulty, gently touch the affected pad with a soldering iron to reflow and correct.
-Malfunctions with the trackpad or power button.
+== Final Testing ==
+After assembling the console, ensure every function is working as expected.
-✅ '''Key Takeaway'''
+If you replaced the Retimer IC mare sure the console is able to output image in 4K.
-“The keyboard IC (U4801/U5701) must come from a firmware-compatible logic board. Although they are electrically identical, their internal configuration depends on the board model and its interaction with the SMC.”
-— Diógenes el Perro
-🛠️ Note: Neither the BIOS nor the SMC were reprogrammed during this repair.