Share the voltage to ground of each pin on the BQ charger ic. Review the series resistor on the VCC pin. Is it 10R ohms or higher?
CMSRC voltage?
CMSRC voltage?
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Readings with PRB9 removed.
BQ24735 (actually BQ24738):
pin 1 ACN = 0.315V
pin 2 ACP= 0.921V
pin 3 CMSRC = 0.89V
pin 4 ACDRV = 0.89V
pin 5 ACOK = 0
pin 6 ACDET = 2.91V
pin 7 IOUT = 0
pin 8 SDA = 0
pin 9 SCL = 0
pin 10 ILIM = 0
pin 11 BATDRV = 1.7V
pin 12 SRN = 1.01V
pin 13 SRP = 1.01V
pin 14 GND = 0
pin 15 LODRV = 0
pin 16 REGN = 6.01V
pin 17 BTST = 5.79V
pin 18 HIDRV = 1.01V
pin 19 PHASE = 1.01V
pin 20 VCC = 19.47V
PRB6 = 10.1 OhmComment
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Issue with ACN and ACP voltages. They must be identical. Something wrong with the pcb traces? This can be the show stopper.Comment
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Also should not have voltage leaking through either of the dcin mosfets. Gate voltage is low so the mosfets should be off.Comment
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Hello guys,
I have a shorted MOSFET K8A60DA with the following characteristics:
Type Designator: TK8A60DA
Marking Code: K8A60DA
Type of Transistor: MOSFET
Type of Control Channel: N -Channel
Maximum Power Dissipation (Pd): 45 W
Maximum Drain-Source Voltage |Vds|: 600 V
Maximum Gate-Source Voltage |Vgs|: 30 V
Maximum Gate-Threshold Voltage |Vgs(th)|: 4 V
Maximum Drain Current |Id|: 7.5 A
Maximum Junction Temperature (Tj): 150 °C
Total Gate Charge (Qg): 20 nC
Rise Time (tr): 25 nS
Drain-Source... -
Dear all,
I have taken out the motherboard of a Acer TravelMate P214. There is a short to ground on the main power rail (19V). I don't have the schematics or boardview for this board (DAZ8IMB1AA0 REVA). But I have found 4 MOSFETS close to the main power rail : 2 N-Channel and 2 P-Channel.
I have checked resistance across each of the 4 MOSFETS. I have the following readings:
Both N-Channel Mosfets: nothing odd
P-Channel MOSFET number 1:
source - drain : 117 kOhm
source - gate: 96 Ohm
gate - drain: 117 kOhm
P-Channel MOSFET... -
Hello everyone,
I'm working on repairing a Music Store Professional GO! SUB 18A bass subwoofer, and I need some help troubleshooting an issue with the power amplifier board. The board uses an IR2153 driver and originally had two SLW20N50C MOSFETs. Unfortunately, these MOSFETs burned out. I replaced them with two TK20J60W MOSFETs; however, these also failed almost immediately.
Here are some details:- SLW20N50C (original):
- Rated for 500 V
- Typical RDS(ON): 0.21 Ω
- Continuous Drain Current: 20 A at 25°C (13 A at 100°C)
- Pulsed Drain Current: 80 A
- Avalanche
- SLW20N50C (original):
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I tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM -
Hi everyone, I am hoping for a little help with an HP 250 G5 with motherboard LA-D704P with a Core i7-6500U. I am new to board repair but keen to learn.
I am sorry this post is quite long but I was trying to systematically work my way through things.
I don't know the history of the board – I bought it as part of a job lot.
I have attached a number of photos of both sides of the board. I cannot seem to find a schematic or boardview online.
When plugged in to DC power the power LED lights and the battery seems to charge. It will not...
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