Raspberry Pi runs fine, but there is no picture when using HDMI Repair: Difference between revisions
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* Use the diode testing mode of a multimeter and connect the black lead to GND (e.g. the metal part of the micro-USB socket). Use the red lead to probe the contacts on top of <code>L4</code> to <code>L7</code> (highlighted pink in the image). There should be no reading. If any value is shown while touching any of the four coils (e.g. 1100mV), the HDMI circuitry inside the CPU is probably broken. This fault cannot be repaired. | * Use the diode testing mode of a multimeter and connect the black lead to GND (e.g. the metal part of the micro-USB socket). Use the red lead to probe the contacts on top of <code>L4</code> to <code>L7</code> (highlighted pink in the image). There should be no reading. If any value is shown while touching any of the four coils (e.g. 1100mV), the HDMI circuitry inside the CPU is probably broken. This fault cannot be repaired. | ||
Latest revision as of 21:15, 13 January 2024
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Raspberry Pi runs fine, but there is no picture when using HDMI Repair | |
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Device | Raspberry Pi |
Affects part(s) | |
Needs equipment | |
Difficulty | |
Type |
Problem description
Raspberry Pi runs fine, but there is no picture when using the HDMI port.
Symptoms
- No picture when using the HDMI port.
Solution
- Test the internal flyback diodes of transistors
Q2
andQ5
with a multimeter. The voltage drop should be in the range of 500 to 700mV. If there is a short (0V), the respective transistor needs to be replaced. Its part number isDMG1012T
.
- Use the diode testing mode of a multimeter and connect the black lead to GND (e.g. the metal part of the micro-USB socket). Use the red lead to probe the contacts on top of
L4
toL7
(highlighted pink in the image). There should be no reading. If any value is shown while touching any of the four coils (e.g. 1100mV), the HDMI circuitry inside the CPU is probably broken. This fault cannot be repaired.