Compaq presario cq40 dead (la-4114p rev. O1

[hispeck]

Hello, i need help on how to troubleshoot this laptop, no power even to jack point, not charging completely dead, board info. LA-4114P CQ40 , no voltage on big coil

[ktmmotocross]

Re: Compaq presario cq40 dead (la-4114p rev. O1

voltage on power connector?

[Gimi]

Re: Compaq presario cq40 dead (la-4114p rev. O1

the voltage will be cut off as you possibly have a short on the motherboard. finding the short is not something that anyone can help you if you have never done this kind of job before.

[ktmmotocross]

Re: Compaq presario cq40 dead (la-4114p rev. O1

the voltage will be cut off as you possibly have a short on the motherboard. finding the short is not something that anyone can help you if you have never done this kind of job before.

come on. even monkeys can repair board if it was telling what to do

[Gimi]

Re: Compaq presario cq40 dead (la-4114p rev. O1

come on. even monkeys can repair board if it was telling what to do

yeah the guy needed help I guess but measuring the big "component" voltage means to me: get someone with knowledge to look at it.
Or you could possibly help him lol

[ktmmotocross]

Re: Compaq presario cq40 dead (la-4114p rev. O1

maybe me, mabe others, but thats why are this forum for

[mcplslg123]

Re: Compaq presario cq40 dead (la-4114p rev. O1

Agreed with ktmmotocross. Check first two DC-In mosfet voltage specially pin4(gate)

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

thanks for the responds, i think it will be wise to give full story of this laptop, this was from a friend of mine, he said this laptop came with no display, what he did was to re bail the GPU and display came up, he now saw that the system was getting hot, to him he wanted to try a different processor but didn't have the exact one for CQ40 , so he now thought DV6700 will march, he now used the processor to try if there will be a change, unfortunately system didn't come up again, there was a smoke, so when he checked one mosfet has burnt beyond recognition, circuit no is PQ202, no way to know what the number is, he now looked at the schematic and saw that it was AO4466_SOB, again he didn't have 4466 so he used 4468, cap PC202 was also shut, after replacing the mosfet with the numbers i just mention, the set came on and shutdown twice and that was the end till now. so am trying to help him out of this mess, but first i want to ask? are those mosfet ok to use for the replacement , what will be the output of mosfet PQ101 4407? please i need help thanks in advance

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

If possible with picture please

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

voltage on power connector is 18v to PQ101

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

Ok i checked PQ101 SI4835BDY-T1-E3_SOB PIN 5.6.7.8 19V 1.2.3 19V 4 7.65v then PQ 103 PIN 5.6.7.8 19V 1.2.3. 19V 4 7.78V

[ktmmotocross]

Re: Compaq presario cq40 dead (la-4114p rev. O1

it was high side mosfet for cpu line so processor may be burned

remove or replace it and check

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

Hello, i managed to do some troubleshooting on the board, i found a shut on PQ202 4466 the two legs of gate and source, and when trace the line, gate went to pin 37 UGATE-NB 0f ic PU201 (ISL6265IRZ) then source went pin 39 LGATE-NB, this two legs are shut. here is the SM of the laptop

[ktmmotocross]

Re: Compaq presario cq40 dead (la-4114p rev. O1

remove, chceck, replace

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

yes i removed the mosfet it is good, the circuit still read shut

[ktmmotocross]

Re: Compaq presario cq40 dead (la-4114p rev. O1

what is shut?

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

the two legs of source and gain on circuit

[hispeck]

Re: Compaq presario cq40 dead (la-4114p rev. O1

sorry for the late respond