The main source & voltage control circuit on IBM Laptop

Post By: mahmoud 2020-05-05

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The main source & voltage control circuit on IBM Laptop

The main voltage source .

The main voltage source is denoted by the letter M IBM at the end as the voltage :

– VCC5M

– VCC3M

– VCC1R8M

– VCC1R2M

1 – control the switching circuits generate the voltage .

a) When the vacuum machine attached DC -IN Adapter

Figure 19 – Circuit mode control resources have DC power adapter plug -IN

Analysis :

– The switching voltage will create VCC5M , VCC3M , VCC1R8M and VCC1R2M . To create these voltages , the switching requires two conditions are VINT16 supply voltage and the command and control VCC5M_ON VCC1R8M_ON source driver IC from PMH4 lead .

– When VCC3SW power , power control IC PMH4 will work , originally 73 feet ( EXT – PWR ) of the IC have a high level by resistors R110 and R53 polarization and temporary IC not have a command control .

– If we plug the vacuum Adapter DC -IN , the voltage is 16V Adapter Should this voltage go through R870 through Zener diodes D9 ( 12V ) the Q73 polarized light leads to , making the voltage of 73 feet ( EXT – PWR ) down low , when foot – PWR EXT is low , the source driver IC will PMH4 VCC5M_ON and VCC1R8M_ON ordered to control for the circuit switching operation .

– When switching – 5V operating voltage will produce VCC5M , this voltage – 3V size for switching operation , switching – 3V operating voltage generated VCC3M ,
PMH4 source driver IC will check the output voltage MPWRG signal through reported 18 feet , if the voltage VCC3M then there will be 18 feet high, this is the truth about the incident controller IC PMH4 , if this leg voltage , the IC will take the command key the next and it will not have a secondary voltage .

b ) When the machine does not add Adapter – only PIN

Analysis :

– When the machine is only associated PIN , IC TB62501 boot source is supplied through VREGIN16 components : Fuse F2 = > resistor R453 = > go to diodes D10 level of IC – TB62501 57 feet .

– VCC3SW voltage generated by the IC – TB62501 leg 59 to power the control IC through pins 7,31,59,80,98 PMH4 sources .

– If we do not plug the Adapter EXT – PWR feet high and will have power control IC does not give orders and VCC1R8M_ON VCC5M_ON , just when you press the switch on the machine PWRSWITCH , then 32 feet of the IC – PMH4 reduced and at this low IC shows the command and VCC1R8M_ON VCC5M_ON to control the operation of switching circuits generate the voltage levels .

– Legs 18 of the IC – PMH4 VCC3M source checks , if this voltage is 18 feet high and IC – PMH4 will continue to open the command to open a secondary source .

Figure 20 – Map source controller mode only PIN

Question and answer :

1) The voltage is what they appear and when?
Answer:
– The source voltage is the voltage that appears when you press the switch or when you plug the adapter (even if not press the switch , but add the legs Adapter DC -IN )
– The source voltage of M are usually denoted in the tail , has four main voltage on the IBM machine that is VCC5M , VCC3M , VCC1R8M and VCC1R2M

2) Conditions for computer output voltage is what ?
Answer:
– The source voltage of switching circuits by creating , so to have this voltage to the following conditions:
* themselves switching works well
* There VINT16 supply voltage for the circuit switching .
* Is the command and control VCC5M_ON VCC1R8M_ON from controller ICs
PMH4 source lead .

3) Conditions to IC controls power output PMH4 VCC5M_ON command and control VCC1R8M_ON What ?
Answer:
– To control IC PMH4 source for the command and control VCC5M_ON VCC1R8M_ON will require the following conditions :
* There VCC3SW voltage for IC – PMH4
* IC controls power good PMH4
* 73 Feet ( EXT – PWR ) is low
foot DC power adapter
through -IN >
* Chan 32 ( PWR SWITCH ) is low
press the switch to open source >

4) I want to check the voltage VCC5M , VCC3M , VCC1R2M VCC1R8M , and then measuring where?
Answer:
You can measure the voltage on the top of the coil with DC voltage scale

Figure 21 – Position measuring the voltage of the machine .

– Measure the voltage at the coil L3 VCC5M if 5V is OK
– Measure the voltage at the coil L4 VCC3M if 3V is OK
– Measure the voltage at the coil L19 VCC1R8M if 1.8 V is OK
– Measure the voltage at the coil L8 VCC1R2M if 1.2 V is OK

5) When the machine was identified as lost as the main source voltage VCC5M , VCC3M , VCC1R8M then we must check what ?
Answer:
– When the machine is lost as the main voltage VCC5M , VCC3M , VCC1R8M or VCC1R2M then you should check the following voltages :
* Check voltage VINT16 ( see previous section )
* Check if the command takes the same time two VCC5M_ON voltage and VCC5M
VCC3M
* Check the command voltage loss VCC1R8M VCC1R8M_ON

To check on the command line look at the following photos :

Figure 22 – IC PMH4 source control is the cause of many problems on the source

Analysis :– Usually two commands will VCC1R8M_ON VCC5M_ON and at the same time and a voltage of approximately 3V command , to the leg , then this is the output voltage to the following conditions :
* The legs of the IC power – PMH4 VCC3SW ( 7,31,59,80,98 foot ) should be
voltage of 3V
* 73 Feet ( EXT – PWR ) should be low ( 0V ) when you plug the adapter .
* Legs 32 ( PWR SWITCH ) should have a low ( 0V ) when you press the switch to open
sources .
= > If you plug the DC -IN Adapter through the leg but still measured 73 feet high ( 3V )
then you need to check components R873 , D9 , Q73 and Q53 as shown in Figure 19 and Figure
24 , 25 below

Figure 24 – Location of components R870 , D9 , Q73 to electrical signals from
Adapter 3 to 7 feet ( EXT – PWR ) of controller IC PMH4

Figure 25 – Q53 street light signal from the adapter to
73 feet ( EXT – PWR ) of the controller IC PMH4

2 – generated voltage switching VCC5
M ( 5V ) and VCC3M ( 3V )

MAX1631 IC fluctuations

Analysis :

Circuit switching voltage generated VCC3M VCC5M and components including :

– MAX6131 IC oscillator .

– Two power lights ( reverse single Mosfet ) Q16 and Q17 to control the VCC5M voltage ( 5V )

– Mosfet Dual Lamp (double contrast ) Q18 to control the voltage VCC3M ( 3V )

operating conditions for the circuit :

– V + supply voltage of IC 22 on foot vibrations MAX1631 , a voltage is supplied from voltage VINT16 after going through R523 ( 10Ω )

– Legs 23 ( SHDN ) voltage of about 3V , if this foot = 0V , the IC voltage fluctuation will be locked , does not work.

– Chan 7 ( TME/ON5 ) voltage command high ( 3V ) to open source VCC5M

– 28 feet ( RUN/ON3 ) voltage command high ( 3V ) to open source VCC3M

After all the conditions on the IC will operate to vary the oscillation signals in the leg DH5 , DL5 control Mosfet Q16 and Q17 and light fluctuations DH3 , DL3 control lights dual Mosfet Q18 .

Principle of operation:

– Voltage power supply to the leg will VINT16 D Q16 and Q18 lights but this light does not work if you do not have foot controls oscillation G.

– VINT16 voltage through R523 ( 10Ω ) Supply on 22 feet of range MAX1631 IC .

– Resistor R903 will be polarized to 23 feet ( SHDN ) is high to allow the IC is ready for operation , if the shutdown command from the IC PWRSHUTDOW TB62501 taken to launch or signals from the IC report SHUTDOW2 overheating of the CPU – LM26 taken to the leg 23 ( SHDN ) will be low and the IC will be locked .

– When leg 23 is placed high on IC ready , if foot 7 ( TME/ON5 ) is high , the IC will vary in foot DH5 and to control the lamp DL5 Mosfet Q16 and Q17 -generating activities VCC5M voltage ( 5V ) , if the foot 28 ( RUN / ON) is high , the IC will fluctuate in the DH3 and legs to control the lamp DL3 Mosfet Q18 reverse dual voltage operation make VCC3M ( 3V ) .

– Mosfet Q16 and Q17 lamps operate on the principle of push pull, then lamps led lights on and off the back , creating electrical impulses in the middle , the coil L3 and capacitor filter will filter for voltage VCC5M flat .

– Similar lamps in pairs Q18 also works to create a voltage pulse at the midpoint , coil L4 and the capacitor voltage filter will filter into the flat for a way out VCC3M sources .

Figure 27 – Regional circuit switching voltage supply and VCC3M VCC5M

Figure 28 – Conditions for IC MAX1631 operating range is 22 feet 11V voltage
to add or PIN 16V Adapter and when attached to a 23 foot high ( 3V )

Figure 29 – After the power supply voltage and voltage of 22 feet to allow 23 feet
there must be open command VCC5M_ON ( 3V ) supply to the leg and foot 28 of IC 7

Question and answer :

1) VCC5M VCC3M voltage and can be measured at any location on the computer ?

Figure 30 – Location switching circuits voltage control and VCC3M VCC5M on an IBM – T40 , T41 , T4

2) Two power VCC3M VCC5M and when they occur and they have not appeared together ?
Answer:
– Two power VCC5M and VCC3M is when press the switch to open source ( if the machine does not add the legs Adapter DC – IN), or it will appear when you plug the adapter ( not including power )
– The voltage appearing at the same time but use the MAX6131 IC fluctuations of voltage 5V line to power VCC5M VL leg , so if it takes 5V IC voltage fluctuations will interrupt .

3) Suppose the failure of circuits Mosfet VCC5M create pressure causing VCC5M source ( 5V ) circuit to create pressure but still good VCC3M VCC3M voltage ( 3V ) was not ?
Answer:
– If the failure of circuits to create pressure VCC5M Mosfet (d. 5V ) when the IC leg VL of voltage fluctuations and the IC will take off after a second oscillation , so the source of pressure vessels VCC3M good though but no activity and no VCC3M out voltage .

4) If failure of the circuit creates a voltage Mosfet VCC3M affect the source VCC5M not ?
Answer:
– If the Mosfet circuit failure VCC3M source ( not short ) voltage loss VCC3M not affect the circuit so the machine still VCC5M source voltage VCC5M .

5) During the repair process and we have to check their sources before vascular repair .
Answer:
– During the repair, we need to check and edit the source VCC5M first, then the new inspection and repair VCC3M sources , we review the magnetic power as follows :
PIN supply ( VBAT ) = > is VREGIN16 = > have VCC3SW & VINT16 = > Click open source = > source VCC5M = > VCC3M sources .

6) Method inspection and repair VCC5M sources like?

Note: Source VCC5M source voltage is when the first plug adapter or when you press the switch to open source if this source is not run nor VCC3M source and then the circuit will lock protection circuits do not have other sources activities . so we need to check first VCC5M source then the source VCC3M .

* If you measure VCC5M source ( 5V ) voltage loss that we check the following:Step 1 – First you need to check voltage VINT16
If you need to take VINT16 source test circuit as create pressure VINT16
mentioned above.

Figure 31 – Measurement of voltage in the coil L3 VCC5M if the circuit will operate with 5V voltage , the voltage measured at the foot of D VINT16 lights 11V Mosfet Q16 must be running when you run the battery or 16V Adapter

Step 2 – Check your legs power the IC leg 22 ( V +) see a voltage
add only about 10V if the PIN or if the machine is about 15V Adapter .

Figure 32 – Measurement of test voltages in the leg 22 ( V +) range of IC
MAX1651 must be 10 to 15V
– If found check the voltage V + in the legs of 22 – MAX1651 IC and IC were not hot enough , the IC was short
– If the voltage loss at the foot of the required 22 feet to check this is not untouched by mass ? , this leg is usually relatively high impedance compared to the mass , if the MAX1651 22 foot touches the usually mass power break R523 to return power to VINT16 this leg .

Figure 33 – Resistance 523 ( 10 Ω ) VINT16 power in the leg 22 of the IC – MAX1651

Step 3 – Check 23 feet ( SHDN ) should be about 3V
– True 23 ( SHDN ) is connected to the voltage control and signal PWRSHUTDOWN shutdown due to CPU overheat shutdown SHUTDOW2 born, if this leg voltage IC = 0 then – Locked MAX1651 will not work .

Figure 34 – Checking 23 feet should be about 3V , the IC can operate

– 23 foot If you take the voltage temporarily isolate it from the foot of the shutdown signal SHUTDOWN to edit this source before the circuit by temporarily removing the children go out of diodes D12 dual machine .

Figure 35 – Legs 23 ( SHDN ) is connected to the shutdown signal goes through diodes D12

Figure 36 – Location Take the D12 dual diodes connected to the leg 23 of the MAX6131 IC range

Please go diodes D12 temporarily removed from the printed circuit to isolate the leg 23 ( SHDN ) of the MAX1651 IC fluctuations during repair VCC5M source

Figure 37 – Control orders created 5V source ( VCC5M ) No. 7 and went on foot to create the source control commands 3V
( VCC3M ) go to 28 foot range of IC MAX1651

– When you plug the adapter or the power button to open the legs of the machine must have a voltage of about 3V voltage is ordered by the IC VCC5M_ON – PMH4 created .
– If the voltage loss in the legs 7 and 28 , you can isolate these two legs and then auction them off line voltage through R 1K VCC3SW to assume command .
– If the voltage loss orders to 7 feet and 28 feet causes damage to the IC is controlled by the source PMH4 not give commands VCC5M_ON

7) Said foot structure and layout of the lights on the circuit Mosfet and VCC3M VCC5M source .

Figure 38 – Location of the Mosfet circuit light sources and VCC3M VCC5M

Figure 39 – Map and foot structure inside the unit back Mosfet IRF 7807

Figure 40 – Map and feet inside the structure of dual reverse lights FDS6986S Mosfet

Said structure and meaning of IC pins variation MAX1631

Leg	Name	Function
1	CSH3	Current Sense Input High – flow sensor high input
2	CSL3	Current Sense Low Input – Sensor low input line
3	FB3	Input feedback – feedback voltage of 3V Road
4	12OUT	OUT 12V – 12V output voltage Legs
5	Vdd	Input for Supply Vol 12VOUT – Source input 12VOUT
6	SYNC	Oscillator Synchronization – Synchronize ranges
7	TIME/ON5	ON / OFF Control 5V – Foot control switch 5V line
8	GND	Ground – True Mass
9	REF	2.5 Reference Voltage – 2.5 V voltage standard
10	SKIP	Connect GND for Normal User – Connect using normal mass
11	RESET	Output Reset – Reset the Signal
12	FB5	Feedback Input for 5 V – 5 V Chan of the road to recovery
13	CSL5	Current Sense Low Input – Sensor low input line
14	CSH5	Current Sense Input High – flow sensor high input
15	Seq	Select Voltage 5V or 3V forward voltage depending on foot seq
16	DH5	High Drive – Gateway to high voltage fluctuations
17	LX5
18	BST5	Boost Capacitor – Capacitor Booster
19	DL5	Drive Low – Gateway to a low voltage range
20	PGND	Power Ground – Mass of the source
21	VL	Chan receives supply voltage from 5V output
22	V +	Legs can supply wide range of changes from 4.2 V to 30V

Figure 41 – Flow Chart variation in IC – MAX1631

23	SHDL	Active Low Shutdown Control – Feet off when low level
24	DL3	Drive Low – Gateway to the low voltage range
25	BTS3	Boost Capacitor – Capacitor Booster
26	LX3
27	DH3	High Drive – Gateway to the higher voltage ranges
28	RUN/ON3	ON / OFF Control Input – True open source drivers off 3V

Note the leg of the IC

MAX1631 IC fluctuations simply note the following legs :

– V + foot leg is the main power supply to the IC , these sources are allowed to vary from 5 to 24V

– VL is the voltage for the IC circuits , this voltage is 5V , the source must obtain feedback from the voltage output 5V .

– SHDL leg is leg Shutdown ( lock IC ) when placed low.

– Seq leg leg voltage selector do before or after , on IBM Laptop legs are connected to fixed voltage Vref 2.5 V standard

– RUN/ON3 impaired leg is open source VCC3M feet when activated at high levels .

– TIME/ON5 foot foot controller is open- source VCC5M when activated at high levels .

Here is the description of the IC active status when the leg is controlled by the voltage :

SHDN	Seq	RUN/ON3	TIME/ON5	MODE	Description
Low	x	x	x	Shutdown	The volume of IC off
High	Vref	Low	Low	Stanby	IC in standby
High	Vref	High	Low	Shaky	Source 3V run / disable 5V
High	Vref	Low	High	Shaky	Source off 3V / 5V run
High	Vref	High	High	Shaky	Both sources are running

Notes:

– High : high voltage levels .

– Low: low voltage .

– Vref : voltage 2.5 V Standard

– x : Not determined .

– Run: run .

3 – IC MAX1845 controller varies the voltage is low.

On the Laptop IBM T40 , T41 , 3 T42 IC MAX1485 is to control low voltage sources such as :

– VCC1R2M

– VCCCPUIO

– VCC1R8M

– VCCVIDEOCORE

– VCC2R5A

– VCC1R25B

In which pairs of sources and VCCCPUIO VCC1R2M IC uses a variation, pairs of sources and VCCVIDEOCORE VCC1R8M IC uses a variation, the pair source using a VCC1R25B VCC2R5A and IC .

Figure 42 – Location of the MAX1845 IC variation on an IBM T40 – 41-42

* Map of the principle of operation vary MAX1845 IC

Analysis :

– MAX 1845 IC fluctuations are often used on circuit switching of the laptop to control the low voltage , this IC has two sides, each side has two ports that is DH and DL , each gateway will control a lamp Mosfet , DH gate Mosfet controller lights on DL longer gate Mosfet control lights below .

– ICs are required to operate a voltage V + from 5 to 24V , 5V supply voltage for Die vdd pins and VCC , the command control at the foot of ON1 and On2

Figure 43 – Map source circuit using IC – MAX1845

Description of the IC pins

PIN	NAME	Function
1	OUT1	Chan asked about the IC output voltage
2	FB1	Chan received voltage feedback , voltage controller in the legs this will change the output voltage from 1V to 5V , IC has been designed for mass leg fighting for the FB voltage default is 1.8 V.
3	ILIM1	Legs create a threshold voltage OUT2 port , depending on voltage into this vacuum that the threshold voltage will change .
4	V +	power the IC legs
5	TON	frequency setting foot operation of the circuit
6	SKIP
7	PGOOD	Power good legs , this leg will not be low if the output voltage or a higher than 10 %
8	OVP	Over Voltage Protect – Protecting the pressure , this leg mass connecting the ICs will be protected when the pressure increases the pressure to 115 % , if this foot is connected VCC overvoltage protection functions will be disabled .
9	UVP	Under Voltage Protect – Protect drop , if this foot is connected to VCC , the circuit will be protected when the pressure drops below 70 % , if the leg is connected mass function has been disabled.
10	REF	Applying the standard 2V and can provide a load current 50μA
11	ON1	open- source voltage command Feet First
12	On2	open- source voltage command Legs 2
13	ILIM2	Leg- gate threshold voltage for OUT2
14	FB2	Similarly for gate leg but FB1 FB2
15	OUT2	Similarly leg but for port OUT1 OUT2
16	CS2	Current Sense – sensor line Feet
17	LX2
18	DH2	High Drive – Chan oscillation pulse amplitude high
19	BST2	Foot offset voltage
20	DL2	Foot pulse amplitude fluctuations less under control lights Mosfet
21	Vdd	5V voltage leg raising
22	VCC	Leg voltage circuits to create pressure for standard VREF
23	GND	Chan Mass.
24	DL1	Foot range to control the lamp under the low capacity of the pair
25	BST1	Foot offset voltage
26	DH1	oscillation amplitude leg out to control the lights high above Mosfet
27	LX1
28	CS1	Leg flow sensor .

4 – Switching Power generated voltage VCC1R8M

VCC1R8M voltage side by a range of IC U51 is the MAX1845 controller , combined with dual Mosfet Q71 lights and coil L19 , the location of the circuit on an IBM T40 , 41-42 , as follows: