IBM THINKPAD T60 DC CHARGING CIRCUIT FAST TEST WAY

Input DC 20V (VINT20, test point 1), after power management chip U42 (MAX8765) processing, output DC 12V voltage (CHARGER_OUT12, test point 2) to charge.

Complementary push-pull circuit Q4A Q4B, opposite phase PWM  pulse signal to control mosfet (test point 3). Look at their waveform on the picture....read more

IBM THINKPAD T60 DC 1.8V 0.9V CIRCUIT FAST TEST WAY

Input DC 20V (VINT20, test point 1), after power management chip U7 (MAX8632) processing, output DC 1.8V voltage (6A VCC1R8A, test point 2).

12-Pin of U7 (MAX8632) output DC 0.9V (VCC0R9B, test point 3).

Complementary push-pull circuit Q43 Q49, opposite phase PWM  pulse signal to control mosfet (test point 4). Look at their waveform on the picture.....read more

IBM THINKPAD T60 DC 1.5V 1.05V CIRCUIT FAST TEST WAY

Power management chip U29 (MAX1540ETJ) output DC 1.5V voltage (VCC1R5M,test point 1), and DC 1.05V voltage (VCC1R05B, test point 2).

Complementary push-pull circuit, opposite phase PWM  pulse signal to control mosfet (test point 3). Look at their waveform on the picture.

U29 25-Pin control the G pole of Q14 Q90 upper mosfet, .... read more

IBM THINKPAD T60 DC3V 5V CIRCUIT FAST TEST WAY

DC 20V ( test point 1) from DC input circuit, through power management chip U41 ( MAX1901), after processing, output DC 3V(test point 2) and DC 5V(test point 3) voltage.

Complementary push-pull circuit,...read more

HP DM1 Laptop Doesn’t Boot, +VCC_CORE Voltage Missing

A HP laptop doesn’t boot, press power button, the current 0.35A stopped, According to experience, doubt power supply for cpu problem. So test +VCC_CORE (PL13), found +VCC_CORE voltage missing. Observe carefully, there is a small hole on the lower mosfet PQ26, it was damaged. Removed PQ26, test the resistance between PL13 inductor and gnd, the value is normal.

So, replace a new PQ26, connect power and boot again, the current still is 0.35A and stopped. Touch power ic RT8165B, very hot, suspected it was damaged, so replace a new RT8165B. Boot again, the current 0.20A stopped, +VCC_CORE voltage missing, yet. Take the schematic diagram, test +VIN, VCC, PVCC, EN, etc,...read more 

ASUS X43B Laptop Doesn’t Trigger, EC Doesn’t Reset

A asus x43b notebook, doesn’t boot, connect power adapter, the current 0.005A, standby 3V, 5V voltages are normal. When press the power button, the laptop doesn’t trigger, the current doesn’t change. So check EC’s working conditions first, the EC chip is KB930QF A1.

So check power, clk, reset singal, found 37-Pin ECRST# singal voltage is 0.24V only, it isn’t normal. +3VALW is normal, and R1605 plus C1533 are RC Time delay circuit, to 37-Pin reset EC.  read more , By the way, In order to thank for every new and old customers and friends, offer 10% off from November 16th to November 30.

TPS51621 QFN-40 Power IC

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TPS51611 QFN-32 Power IC

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TPS51610 QFN-32 Power IC

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TPS51511 QFN-20 Power IC

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TPS51461 QFN-24 Power IC

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TPS51427 QFN-32 Power Controller IC

http://www.htic-tool.com/tps51427-qfn32-power-controller-ic-p-1652.html

HP Compaq 511 Laptop Doesn’t Boot, Current 0.182A Fault

A HP Compaq 511 laptop, Press the power botton, the current 0.182A, then auto power off, doesn’t boot.

According to the current value, so doubt the power circuit problem, test +3VS, found the voltage is missing. +5VS voltage is normal.

So, check mosfet Q39 control G pole, the GATE_3S_R voltage is 0.24V only, it is not normal. Due to +5VS is normal, so GATE_3S is normal, just check GATE_3S_R circuit....read more

TPS51220A QFN-32 Power IC

http://www.htic-tool.com/tps51220a-qfn32-power-ic-p-1650.html

TPS51222 QFN-32 Power Controller IC

http://www.htic-tool.com/tps51222-qfn32-power-controller-ic-p-1651.html

HP 500 Laptop Clock Circuit Diagram And Failure Analysis

1, U28(ICS 954226) clock chip, if damaged, it will not respond when press the power button. Or auto reboot, or auto power off after led light. If 954226 pseudo soldering, will be able to boot sometimes, can not boot sometimes.  

2, L31, L32 inductor, if damaged or pseudo soldering, it will not respond when press the power button, or auto power off.

3, X1 crystal oscillator, if damaged, will not able to boot.

4, C428, C431 resonant capacitor, if electric leakage or damaged,...read more

TPS51218DSCR PIZI QFN-10 Power IC

http://www.htic-tool.com/tps51218dscr-pizi-qfn10-power-ic-p-1649.html

TPS51211 QFN-10 Power IC

http://www.htic-tool.com/tps51211-qfn10-power-ic-p-1648.html

UCC3804N DIP-8 PWM IC

http://www.htic-tool.com/ucc3804n-dip8-pwm-ic-p-1647.html

HP 500 Laptop Power Supply For Chipset Diagram And Failure Analysis

1, PU8(MAX8743) power control chip for chipset, if damaged, will not able to boot, or the fan rotations but cannot boot. Or auto power off after work for a period of time, or chipset very hot.

2, PQ20 mosfet, if damaged, will auto power off after work for a period of time, or cannot boot.

3, PL9 inductor or PC71 capacitor, if pseudo soldering, will auto power off after boot....read more

UC3854BDW SOP-16 ADVANCED HIGH-POWER FACTOR PREREGULATOR IC

http://www.htic-tool.com/uc3854bdw-sop16-advanced-highpower-factor-preregulator-ic-p-1646.html

UCC2818DW SOIC-16 Current-Mode SMPS Controller IC

http://www.htic-tool.com/ucc2818dw-soic16-currentmode-smps-controller-ic-p-1645.html

uP6215AK QFN-48 Power IC

http://www.htic-tool.com/up6215ak-qfn48-power-ic-p-1644.html

HP 500 Laptop Charging Control Circuit Diagram And Failure Analysis

1, PU1 (BQ24703) charging control chip, if damaged, the battery will not be able to chare. Or there is no response when press the power button. Or cannot boot.

2, PQ9 charging control mosfet, will not able to boot, plug power adapter, the led flicker.

3, PR19 resistor, if open circuit or pseudo soldering, will can not charge, or charge can not up to 100%.

4, PQ4 if damaged, only normal boot when power supply via battery, but system halted when power supply via the adapter.

5, PQ2 if damaged, only noot normal when power supply via the adapter,..read more

uP6209AQ QFN-24 Power IC

http://www.htic-tool.com/up6209aq-qfn24-power-ic-p-1643.html

UP6207BI QFN-32 Power IC

http://www.htic-tool.com/up6207bi-qfn32-power-ic-p-1642.html

UP6205A QFN-24 Power IC

http://www.htic-tool.com/up6205a-qfn24-power-ic-p-1641.html

HP 500 Laptop EC Control Circuit Diagram And Failure Analysis

1, U20 (KB910) EC control chip, if Pseudo Soldering, there is no response when press the power button; if KB930 damaged, will often appear system halted, or no response when boot, or the keyboard will not be able to use.

2, C362, C363 resonant capacitance, if damaged, will system halted when system boot. If resonant capacitance electric leakage, the clock will not be accurate.

3, Y1 crystal oscillator, if damaged, there is no response when press....read more

UP6182AG QFN-24 Power IC

http://www.htic-tool.com/up6182ag-qfn24-power-ic-p-1640.html

UP6117BH QFN28 Power IC

http://www.htic-tool.com/up6117bh-qfn28-power-ic-p-1639.html

HP 500 Laptop Power Supply For Memory Diagram And Failure Analysis

1, PU5 (ISL6269 power control chip for memory), if damaged, the led will light when press power button, but can not boot, or does not display, diagnostic card code C1, or blue screen, or often auto reboot, or black screen with alarm.

2, PQ16 mosfet, if damaged, will auto reboot when boot, or blue screen and system halted.

3, PQ17 mosfet, if damaged, will system halted or reboot, or auto power off from protection circuit.

4, PC42 Filter capacitor, if damaged, will system halted or reboot, or can not boot....read more

UP6103S8 SOP8 Power IC

http://www.htic-tool.com/up6103s8-sop8-power-ic-p-1638.html

UP1952P SOP8 Power IC

http://www.htic-tool.com/up1952p-sop8-power-ic-p-1637.html

HP 500 Laptop Power Supply For CPU Diagram And Failure Analysis

1, PU9 (MAX1532) Power control IC, if damaged, will auto shut down, or system halted, or can not boot, or led lights but can not start up. If it pseudo soldering, will be often reboot or auto shut down.

2, PQ21, PQ25 mosfet, if they damaged, will auto shut down after boot, or the fan spin for an instant and shut down. If one mosfet damaged, will auto shut down when run a big program.

3, PQ22, PQ26 mosfet, if damaged, the led will flicker one time when press the power button, then shut down. Or auto shut down after boot.

4, PC85, PC115 Filter capacitor, if short circuit, will not able to charge, and can not boot, too.

5, PC94, PC95, PC285, PC286 Filter capacitor, if damaged, will not be able to boot or system halted.

6, PL12, PL13 inductor, if pseudo soldering, will generate cheep noise when boot.

7, PR104 resistor, if pseudo soldering, will not able to boot....read more

UP1602P QFN48 Power IC

http://www.htic-tool.com/up1602p-qfn48-power-ic-p-1636.html

1pcs UP1589Q QFN Standby Power IC

http://www.htic-tool.com/1pcs-up1589q-qfn-standby-power-ic-p-1635.html

AMD 215-0807027 BGA With Balls Chipset

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AMD 215-0807007 BGA With Balls Chipset

http://www.htic-tool.com/amd-2150807007-bga-with-balls-chipset-p-1633.html

HP 500 Laptop System Power Supply Diagram And Failure Analysis

1, The power control chip MAX8734 damaged, will not be able to boot, there is no response when press the power button.

2, PQ11 mosfet damaged, will auto shut down after boot, or auto power off after work for a period of time, or the led flickers and can not start up.

3, PQ12 mosfet damaged, will not response when press the power button, or the led lights one time, then put out immediately.

4, PL4 filter inductance pseudo soldering, will require starting up many times, just can boot successfully.... read more

NEW AMD 215-0716050 BGA Chipset

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ACER V5-471G laptop does not boot share

An acer V5-471G notebook can not start up, connect the dc power supply, the standby current 0.006A, press the power button, the current up to 0.02A, Keep 2 seconds, then return to 0.006A, the power led does not light. Open the laptop, check the operating conditions for RT8223, VIN 19V, test 3.3V_AUX_S5, 5V_AUX_S5, both ok, 3.3V_PWR and 5V_PWR have not voltage. So check timing sequence.

Several signal must come out before 3V\5V comes, test +3.3V_RTC_LDO it is  3.3V, +RTC_VCC it is 3.3V, +PWR_SRC it is 19V, they are normal. Test S5_ENABLE, the voltage is 0V. .... read more

NEW AMD 215-0804026 BGA Chipset

http://www.htic-tool.com/new-amd-2150804026-bga-chipset-p-1629.html

Lenovo Y470 does not display share

A Lenovo Y470 laptop, it can start, but doesn’t display. The version : LA-6881P. Connect power supply, the standby current 0.018A, press the power button to start up, the current is 0.088A, it does not display.

 

Open the notebook, start up, test +5VALW +3VALW, all are ok. Then test PL501　+1.5VP, OK. But test +5VS, +3VS, they are 0V voltage, So check the 4-pin of U46, the voltage is 0V, too. Then check the G pole of Q99, the SUSP is 0V, It is normal. So check the D pole, the +VSB is 0V, it is not normal.... read more

1pcs UP0109P SOP8 Power Management IC

http://www.htic-tool.com/1pcs-up0109p-sop8-power-management-ic-p-1627.html

VT6656 CD TQFP-128 IC

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VIA VT6105 CD QFP IC

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VT6104 QFP IC

http://www.htic-tool.com/vt6104-qfp-ic-p-1624.html