samsung R420 blingking led no power..

[rickybucalan]

hello guys another problem again.

i got samsung R420 it just blink when you plug the charger. no power when press on.

i checked all coil. did not find 5v and 3.3v

i found shorted coil it reads 0.004v from pin to ground. and 330uf caps i removed and still shorted pads.

dont know where to trace the path cos i dont have diagram.

pls help...

[cyberhack]

Re: samsung R420 blingking led no power..

See if this helps

[rickybucalan]

Re: samsung R420 blingking led no power..

See if this helps

thank you men. upon checking your diagram i found out that missing bios.
could be taken by other tech.

[rickybucalan]

Re: samsung R420 blingking led no power..

do you have bios file for this. tnx

[cyberhack]

Re: samsung R420 blingking led no power..

Has it got a mother board number
BA41-01084A if it's DA-10TH use this

[rickybucalan]

Re: samsung R420 blingking led no power..

Has it got a mother board number
BA41-01084A if it's DA-10TH use this

tnx but it still same.

i checked TPS51125 for 5v and 3.3 v ALW here's my reading

VIN =19V
LL1= 0V
LL2= 0V
VREG5= 5V
VREG3=3.3V
VCLK= 0V
VREF= 2V
VBST1= 4.95V
VBST2= 4.92V
ENO= 1.5V
DRVL1=0V
DRVL2= 1.2V
TONSEL=5V
SKIPSEL=3.3V
VO1= 0V
VO2= 0V

[rickybucalan]

Re: samsung R420 blingking led no power..

guys?

[mielta]

Re: samsung R420 blingking led no power..

Hello
Have you ram inside or ram checked

[ktmmotocross]

Re: samsung R420 blingking led no power..

thank you men. upon checking your diagram i found out that missing bios.
could be taken by other tech.

what bios ic do u use as a replace

[ktmmotocross]

Re: samsung R420 blingking led no power..

tnx but it still same.

i checked TPS51125 for 5v and 3.3 v ALW here's my reading

VIN =19V
LL1= 0V
LL2= 0V
VREG5= 5V
VREG3=3.3V
VCLK= 0V
VREF= 2V
VBST1= 4.95V
VBST2= 4.92V
ENO= 1.5V
DRVL1=0V
DRVL2= 1.2V
TONSEL=5V
SKIPSEL=3.3V
VO1= 0V
VO2= 0V

From TPS51125 datasheet:

The clock signal becomes available when EN0 becomes higher than 2.4 V

[rickybucalan]

Re: samsung R420 blingking led no power..

what bios ic do u use as a replace

it was SST25VF016B

i replace it with PCT25VF016B.

and flash it with bios file given by cyberhack. thanks by the cyberhack...

[rickybucalan]

Re: samsung R420 blingking led no power..

From TPS51125 datasheet:

The clock signal becomes available when EN0 becomes higher than 2.4 V

should i replace the tps51125.?

[ktmmotocross]

Re: samsung R420 blingking led no power..

check why u have only 1.5V

[ktmmotocross]

Re: samsung R420 blingking led no power..

it was SST25VF016B

i replace it with PCT25VF016B.

and flash it with bios file given by cyberhack. thanks by the cyberhack...

dont know if its compatible. i have this list

16 Mbits (these chips are equivalent and interchangeable)
A25L016M-F AMIC
AMIC A25L016M-UF
MX25L1605DM2 Macronix
EN25F16-75H EON
EON EN25F16-100H
-75H EN25D16 EON
EON EN25D16-100H
W25X16VS WINBOND
WINBOND W25Q16VS
SST25VF016B SST

[rickybucalan]

Re: samsung R420 blingking led no power..

TPS51125 PGOOD is 0v. is that faulty?

[ktmmotocross]

Re: samsung R420 blingking led no power..

if u have 3.3V and 5V line ok than yes. But u have low enable signal so chip cannot run. check why u have low enable signal. maybe bios incompatible

[fddizon]

Re: samsung R420 blingking led no power..

maybe you should eliminate shorted part first. can you tell which coil is shorted?