Summary of "Te Enseño Como Diagnosticar Una GRAFICA // GTX 1050TI"

Short summary

This video shows technician Valentín (DGP Fix Tijuana) diagnosing a non‑detected, low‑profile GTX 1050 that the PC ignored (system fell back to integrated video). He uses a systematic hardware workflow — visual/functional checks, multimeter resistance testing, and low‑voltage injection — to find a short on the 1.8V rail. The short caused the GPU die to overheat and become damaged. Because the GPU itself is compromised, the card is not cost‑effective to repair unless the GPU die is replaced.

Video overview

Technician: Valentín (DGP Fix Tijuana).
Problem: GTX 1050 not recognized by the PC; integrated video used instead.
Method: Systematic hardware diagnostics using a multimeter and voltage injection to find the failing rail/phase.
Final finding: Short on the 1.8V rail that led to the GPU die overheating and shorting. GPU chip damage makes repair impractical unless the GPU die is replaced.

Diagnostic concepts, procedures and practical tips

The video is presented tutorial‑style. Key concepts and the stepwise approach Valentín demonstrates:

1. Visual / functional check

Install the card and confirm whether the motherboard outputs integrated video. If the system ignores the discrete GPU, suspect:
- Missing voltages (rail not present)
- Missing essential signals (PEG reset, clock)
- A damaged GPU or other critical component

2. Use a multimeter (resistance/ohms mode) to identify coils/rails

Identify coils by location and surrounding components (e.g., memory coils often have MOSFETs nearby).
Measure resistance across coils and compare values to map which coil corresponds to which rail by elimination.

3. Typical resistance ranges (general guidance — varies by card)

12V coils: typically in kilohms (≈ 10K–30KΩ). Very low values suggest a short.
5V coils: around ~5KΩ (varies).
1.8V coils: roughly 0.9K–1.8KΩ (can be ~0.7KΩ on some cards). Expect kilohms, not ohms.
Memory (MBDD) phase: measured in ohms — tens to a few hundred ohms (≈ 20–200Ω).
PEX and other chip‑connected rails (PEX, NBDD/MBDD): measured in ohms, can range from a few ohms to tens/hundreds depending on GPU family.
GPU power phases (directly at the GPU) often show very low values (appear like shorts) — these are not useful to measure the same way as independent rails.

4. How to tell if a coil is “shorted”

Touch multimeter probes together to note the meter’s baseline “short” reading.
If a coil measures near that baseline and is outside expected ranges, suspect a short.
If uncertain, use a current‑limited bench supply to inject a low voltage and observe current draw.

5. Voltage injection troubleshooting (safe isolation method)

Inject a small test voltage first (e.g., 1.0V instead of full 1.8V) to check for immediate heating or large current draw.
Observe which components heat (resistors, MOSFETs, GPU die). Heating indicates current flow through that path.
To isolate the short, remove suspect resistors/components on one side of a network, then reinject and test again.

6. Practical measurement tips

Confirm your meter’s unit (Ω vs KΩ) before interpreting values.
Use elimination: measure every coil/phase and rule out rails with expected values until you isolate the bad rail.
Absolute resistance values vary by model; compare results with similar cards and build experience.

Case specifics and conclusion

On the examined GTX 1050 the 1.8V coil measured around 262–265Ω — far lower than expected (should be in kilohms) and therefore abnormal.
Injecting 1V caused resistors and then the GPU to heat rapidly. The GPU die was effectively shorted/burned.
Conclusion: the GPU chip itself is damaged. While replacing the GPU die via hot air rework is theoretically possible, it is not cost‑effective for this card unless one already has the replacement die and tooling. Valentín judged the card not worth repairing in situ.

Practical takeaways / recommendations

If a discrete GPU is present but not enumerated, methodically check rail voltages and coil resistances.
Combine resistance measurements with low‑voltage injection to find shorts without immediately applying full rail voltages.
Remember typical measurement patterns:
- Memory phases and PEX/NBDD/MBDD often measured in ohms.
- 12V/5V/1.8V rails typically measured in kiloohms (except GPU power phases).
Be transparent with customers: show measurement evidence (voltages, heating under injection) and explain when a card is beyond practical repair.
Experience matters: expected resistance ranges differ by GPU family and model.