IBM/Lenovo Thinkpad R500 dead

[Thermaltake]

I got this R500 Thinkpad and is dead for a while now guy said one day it just won't turn on or charge or give any indication I test it and it really won't show any kind of life in it. I measure pin on charger and it's giving 20+ V so I guess charger is fine, don't know what is common problem on this series of laptop to test it or to check, can someone help.

P.S
I tried draining capacitors with power button (10 times 10 seconds and last time 30) but still nothing.

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

Disassemble the laptop, see if u can see any burnt items. Start measuring voltages at coils, see if the 3 and 5 v present while the laptop I turned off then start measuring resistance at coils with out power connected. Search for schematics and see if any shorts at ADP in circuit.

[Thermaltake]

Re: IBM/Lenovo Thinkpad R500 dead

I will see for that burn items, can you tell me where are the coils here on picture that I need to measure and how to measure them where to put - probe and where + probe when I measure.

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

Have you a multimiter, soldering iron and hotair station then u can proceed.

In the pic pointed some coils, there should be around 7-9 of them of variable sizes.

U measure the resistance to ground without power attached. the red multimeter probe to ground (marked red) and the black to one side of the coils. Put the multimeter in diode testing mode or chose low ohm. Any low resistance might indicate shortage. To test for voltages at coils the insert power, don't power on yet, check the coils for existence of 3.3 and 5 volts at any of those coils. Put the multimeter on DC volt range 20, black to ground and prob one side of coils with red.

[Thermaltake]

Re: IBM/Lenovo Thinkpad R500 dead

I need to unsolder them to measure or I can measure resistance and voltage when they are soldered on board ?

[ktmmotocross]

Re: IBM/Lenovo Thinkpad R500 dead

just go from adapter connector further. there are two 8pin mosfets. check for voltage on it

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

I need to unsolder them to measure or I can measure resistance and voltage when they are soldered on board ?

Must done while SOLDERED.

[Thermaltake]

Re: IBM/Lenovo Thinkpad R500 dead

Sorry for taking it so long I was extra busy and really didn't have time to disassemble the laptop and measure but this weekend I had some spare time to check it. I measure 001.2 on one coil others are 0000 I assume that one is making a problems, can really that one coil make laptop completely dead ? Is it worth buying that one new voltage coil for this old laptop ? And where can I find them I searched on ebay and aliexpress but no luck.

[imranromi]

Re: IBM/Lenovo Thinkpad R500 dead

To check under the PCMCIA card remove the card and check component.

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

Which mode are you measuring at, resistance or continuity? Don't know what u r doing wrong there but these reading are not normal, by the way, the small coils beside the CPU socket must be measured with the CPU offboard. I usually measure at continuity mode.

[Thermaltake]

Re: IBM/Lenovo Thinkpad R500 dead

To check under the PCMCIA card remove the card and check component.

Under PCMCIA card is empty slot for card, don't get it... That on the right in the hole is plastic.

Which mode are you measuring at, resistance or continuity? Don't know what u r doing wrong there but these reading are not normal, by the way, the small coils beside the CPU socket must be measured with the CPU offboard. I usually measure at continuity mode.

I was measuring in this mode



I didn't measure with continuity no beeps if that is what you mean I'm not an expert so I don't know exactly how to do all this if you could guide me what to do to measure correct.
So I need to remove the CPU when I measure, ok.

[ktmmotocross]

Re: IBM/Lenovo Thinkpad R500 dead

measure two mosfets just after the adapter connector. not coils

look for schematic

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

measure two mosfets just after the adapter connector. not coils

look for schematic

Try measuring at diode mode and see for continuity or voltage drop to ground. And as the above see if any voltages pass the two mos. Then start looking for 3.3v and 5v on two of the coils.

[saqib]

Re: IBM/Lenovo Thinkpad R500 dead

change urs keyboard

[Thermaltake]

Re: IBM/Lenovo Thinkpad R500 dead

measure two mosfets just after the adapter connector. not coils

look for schematic

@tibd told me first to measure resistance and then voltage, so resistance is not important now or ? Draw me I'm noob how to measure and what to put on multimeter.

Try measuring at diode mode and see for continuity or voltage drop to ground. And as the above see if any voltages pass the two mos. Then start looking for 3.3v and 5v on two of the coils.

What mode is that at multimeter on that picture ?

change urs keyboard

What is urs keyboard ?

[ktmmotocross]

Re: IBM/Lenovo Thinkpad R500 dead

if u dont have voltage or is low than u can measure resistance. first two mosfets is the first part of circuit that enables the main voltage

[imranromi]

Re: IBM/Lenovo Thinkpad R500 dead

Sorry for taking it so long I was extra busy and really didn't have time to disassemble the laptop and measure but this weekend I had some spare time to check it. I measure 001.2 on one coil others are 0000 I assume that one is making a problems, can really that one coil make laptop completely dead ? Is it worth buying that one new voltage coil for this old laptop ? And where can I find them I searched on ebay and aliexpress but no luck.

sorry my means is installed the ram below the picture left side card installed remove the card and lenevo name chip and more chip look.

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

The resistance we are talking about at the coils here are not that high. in your picture u r measuring with KΩ, that's high for such measurement. I recommend you either using only Ω range or diode mode (continuity) which is with this symbol as in attachment. you put your MM exactly as in your picture then adjust to Ω or continuity with the RANGE button upper left.

[tibd]

Re: IBM/Lenovo Thinkpad R500 dead

As for 3.3v and 5v you should fine those at coils marked L3 and L4 with power attached.

[Thermaltake]

Re: IBM/Lenovo Thinkpad R500 dead

if u dont have voltage or is low than u can measure resistance. first two mosfets is the first part of circuit that enables the main voltage

I didn't measure yet with cord connected only resistance (Ω).

sorry my means is installed the ram below the picture left side card installed remove the card and lenevo name chip and more chip look.

You mean under that black tape ?

The resistance we are talking about at the coils here are not that high. in your picture u r measuring with KΩ, that's high for such measurement. I recommend you either using only Ω range or diode mode (continuity) which is with this symbol as in attachment. you put your MM exactly as in your picture then adjust to Ω or continuity with the RANGE button upper left.

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