- Description
GHD Q4 MOSFET – Essential PCB Repair Component
SIRIUSHAIR has identified a common failure point in newer GHD models, particularly:
- S7N261
- S7N421
The Q4 MOSFET on the main PCB is prone to failure and can cause serious damage if not replaced.
Prevent Costly Heater Damage
Failure of the Q4 MOSFET can be catastrophic, often resulting in:
- Instant damage when power is applied
- Heater elements cracking or breaking
- Expensive repeat repairs
For this reason, we replace the Q4 MOSFET as a standard procedure on every repair, even if it has not yet failed.
Proactive Replacement Recommended
Even if your MOSFET appears functional, replacing it is strongly advised:
- Prevents sudden failure
- Protects newly installed heaters
- Ensures long-term reliability
Skipping this step can result in costly and frustrating damage to your repair work.
Precision Component – Skilled Installation Required
The Q4 MOSFET is a small PCB component, and replacement requires:
- Soldering experience
- Careful handling of the circuit board
This is recommended for experienced repairers or technicians.
Protect Your Repair Investment
If you have replaced heater elements, failing to replace the Q4 MOSFET could result in immediate failure and wasted time and cost.
Don’t take the risk—replace the Q4.
Trusted SIRIUSHAIR Quality
As with all SIRIUSHAIR components, this MOSFET has been selected based on real repair experience to ensure the best possible outcome.