Hardware_Mods

1. Sound

1. violet ⇅ 1nF (Part 526)
   
2. red ⇅ 1µF (Part 528)

Picture of the original Speaker AEC 16Ω / 1W / Diameter 36mm

YouTube Quansheng UV K5 Poprawa audio Audio Fix

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who did it?
Matteo?
BK7IKD

YT-Video "Quansheng uv-k5 - audio Hi-Cut (1nF capacitor) hardware mod. AirBand test." from Andrzej Kuczwara

2a. Add possiblity to use USB-PD-Cable (USB-C-to-USB-C)
or USB-A-to-USB-C-Cable

Insert 2 resistors of 5.1 kΩ each from ground to the CC pins (A5 / B5). This hack requires a good eye and good nerves ;-)
Wiring the two configuration pins CC with 5.1kΩ resistor signals the PD charger that it can apply 5V.
Without this resistor-combination, no voltage is applied.

USB-C Port												USB-C
Soldersite	GND	Vbus	CC	SBU	bD-	aD+	aD-	bD+	CC	SBU	Vbus	GND
	▮ ▮	▮ ▮	▮	▮	▮	▮	▮	▮	▮	▮	▮ ▮	▮ ▮
	┃		┃						┃
	┃		5,1kΩ						5,1kΩ
	┃		┃						┃
	┗	━	┻	━━	━	━	━	━	┛

↧↥ ⇅

2b. USB-C Mod with Custom Made Flex-PCB

Source: Telegram, 2023-09-11
User: Matt

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3. Fix Solder-Blob on PCB 1.4

Source: Phil McAllen
1.Step: Carefully lift the display frame

2.Step: Check PCB and clean this Bridge (see next section too)
On PCB 1.4 is a Trace between Cap and Connector, Solder-Blob is in this Version not a Problem!

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4. Fix Sound-Connector Soldering Blob

Source: Telegram RU, 2023-12-21
User: SochiFix, Erik S
Descryption: on many devices are soldering-blobs between connector and capacitor found

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5. Fix Power failure with external Handset (warming Speaker with DC on Output) or Unwanted busy channel lockout effect on external PTT.

Source: Telegram, 2024-02-15
User: .. / .... .-- . / .--.---.--.-.. . Thanks for Comment from User EGZUMER: "To be precise, the direct cause of heating is the shorting blob, no short - no heating, although the capacitor will fix it too. The actual issue that capacitor fixes is unwanted busy channel lockout effect on external PTT."
1: On PCB 1.4, desolder first resistor (510 0 Ohm)
2: Mount a 100µF 16V Tantal Capacitor (Size: 6032-25)


OR

1: On PCB 1.?, Cut Trace between Capacitor (516 empty)
2: Mount a 100µF 16V Tantal Capacitor (Size: 6032-25)

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6. Implement Si4732 Daughter board to QS-Radio

Source: Telegram, 2024-02-26
User: Teda (Dario IV3NFC)
YT: https://www.youtube.com/shorts/vjpNC3NNJBk
ALI

7. Implement Si4732 Flexboard to QS-Radio

Source: Telegram DEV, 2024-04-21
User: R
ALI: https://de.aliexpress.com/item/1005006850820263.html ALI:https://a.aliexpress.com/_EzYzHeF