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DFL-FRP PCB REPAIRING http://forum.hddguru.com/viewtopic.php?f=24&t=36804 |
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Author: | marcuscercal [ May 11th, 2018, 15:19 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
Hi, What is write in U1 component ( reference ) ? Regards. |
Author: | pikus_09 [ May 11th, 2018, 15:21 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
This is LM2678 DC converter National Semiconductors. Author let check F1 and F2. Then Check Power supply on U1 LM2678. |
Author: | fzabkar [ May 11th, 2018, 18:30 ] | ||
Post subject: | Re: DFL-FRP PCB REPAIRING | ||
U1 would be the +5V supply. This supply would be common to both the IDE and SATA channels. Also, U1 would be the source for the secondary supplies (for the logic). Therefore, I can't see a problem here. F1 - F4 appear to be polyswitches or polyfuses (resettable fuses). I would measure the voltages at those pins that are marked with squares. Can you tell us the markings on Q1? IRFR5305, International Rectifier, HEXFET, P-ch, -55V, -31A, RDS(on) = 0.065 ohm, 110W, D-Pak: https://www.infineon.com/dgdl/irfr5305. ... 324d0820fd LM2678, Texas Instruments / National Semiconductor, Step-Down switching Regulator, 5A, 8V - 40Vin: http://www.ti.com/lit/ds/symlink/lm2678.pdf
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Author: | fzabkar [ May 12th, 2018, 4:33 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
Code: +12V + | .---+---. | | .-. | R6/R11 | | | | | | '-' | | | | G | S +----||-+ Q5/Q10 | ||-> IRFR5305 Q6/Q11 | ||-+ SATA/IDE ___ |/ | D F2/F4 power o---|___|---| | _ on/off |> '----o \_/o---o +12V from R7/R12 | output logic | poly- o PCB | switch | === === GND GND Code: +5V +12V +5V + + + | | | .-. .-. | R1/R?? | | | | R2/R9 | | | | | | '-' '-' | | | | | | | D +----. +-----------||-+ Q1/Q7 | | | G ||<- Q2/Q9 | | | Q6/Q8 ||-+ SATA/IDE ___ |/ | |/ | S F1/F3 power o---|___|---| '---| | _ on/off |> |> '----o_/ \o---o +5V output from R5/R10 | | logic | | poly- o PCB | | switch | === === === GND GND GND Logic 1 = power ON Logic 0 = power OFF |
Author: | Abdul Rauf [ May 12th, 2018, 4:45 ] | |||
Post subject: | Re: DFL-FRP PCB REPAIRING | |||
when i opened the box first time i saw 3 capacitor damage. i replace three capacitors , original value was 10v 2200uf,and a replace with 10v 1000uf .but result is same .can it be cause of capacitors .
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Author: | fzabkar [ May 12th, 2018, 10:01 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
Can you show us the other side of the PCB? Can you also show us both sides of the logic PCB? Can you tell us all the markings on the original and replacement capacitors? Something doesn't look right ... |
Author: | sourcerer [ May 13th, 2018, 14:22 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
Abdul Rauf wrote: when i opened the box first time i saw 3 capacitor damage. i replace three capacitors , original value was 10v 2200uf,and a replace with 10v 1000uf .but result is same .can it be cause of capacitors . Hmm, 1000uf is less than half the capacity of 2200uf, which could be the cause for problems, yes. But it's a bit strange that you do not get any power output. Did you make sure that you mounted them in the right direction? |
Author: | fzabkar [ May 13th, 2018, 14:56 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
sourcerer wrote: Did you make sure that you mounted them in the right direction? The polarity stripes on the caps are consistent with the "+" indicators on the silkscreen. |
Author: | fzabkar [ May 13th, 2018, 15:14 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
sourcerer wrote: Hmm, 1000uf is less than half the capacity of 2200uf, which could be the cause for problems, yes. I don't think that there is any requirement for capacitors at each of the +5V and +12V outputs. In fact I don't understand their purpose (other tools don't have them). However, the capacitor at the 5V regulator should be a low ESR, 105 degC type. Moreover, the capacitor at the 12V input appears to be a 10V type, so something could be seriously wrong here. I'm also waiting to see the logic PCB so that I can determine whether it is safe to connect +5V directly to the on/off control pins (for testing purposes). However, the OP's responses so far would suggest that visual inspection may be the limit of his troubleshooting ability. :-( |
Author: | mad4hdd [ May 14th, 2018, 4:42 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
hello abdul rauf , i never worked on this PCB but visually what i understand that is same as fzabkar already told you, so i would advice you to follow fzabkar instructions. addition from my side is = did you use new capacitors ? 2nd choose 105 degree caps 2200uF /16V( you can find RUBYCON or UNICON caps in local market easily ) 3rd when you turn on power from software you have to check if SATA control pin is high or low ? you will need to look other side too . 4th its possible connector from its motherboard or main PCB is loose or bad contact. i assume the input power supply is good ( i mean current not Volts ). right ? because you already mentioned IDE port is good . MOSFETs are good too ? |
Author: | Abdul Rauf [ May 14th, 2018, 6:46 ] | |||
Post subject: | Re: DFL-FRP PCB REPAIRING | |||
fzabkar wrote: Can you show us the other side of the PCB? Can you also show us both sides of the logic PCB?
Can you tell us all the markings on the original and replacement capacitors? Something doesn't look right ...
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Author: | Abdul Rauf [ May 14th, 2018, 6:50 ] | ||
Post subject: | Re: DFL-FRP PCB REPAIRING | ||
pikus_09 wrote: This is LM2678 DC converter National Semiconductors. Author let check F1 and F2.
Then Check Power supply on U1 LM2678.
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Author: | Abdul Rauf [ May 14th, 2018, 6:54 ] | ||
Post subject: | Re: DFL-FRP PCB REPAIRING | ||
Abdul Rauf wrote: pikus_09 wrote: This is LM2678 DC converter National Semiconductors. Author let check F1 and F2. Then Check Power supply on U1 LM2678.
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Author: | Abdul Rauf [ May 14th, 2018, 7:02 ] | ||
Post subject: | Re: DFL-FRP PCB REPAIRING | ||
fzabkar wrote: Can you show us the other side of the PCB? Can you also show us both sides of the logic PCB?
Can you tell us all the markings on the original and replacement capacitors? Something doesn't look right ...
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Author: | fzabkar [ May 14th, 2018, 16:10 ] | ||
Post subject: | Re: DFL-FRP PCB REPAIRING | ||
I can't see all the markings on the bad capacitor (can you tell us what they are?), but I'm assuming its a ZLH series Rubycon. If so, then all the caps have good specs, in which case I can only assume that DFL was stung by a bad batch, or maybe even fakes (?). It would be difficult to measure the test points when the unit is assembled. However, the power board can be tested on its own if a jumper wire is added between the +5V supply and the SATA on/off control pin. I also can't see the markings on the N-ch MOSFET (Q1). Can you tell us what they are? BTW, the pushbutton switch looks like it needs replacing. RGEF500, Littelfuse, PTC Polyswitch, 16V, 5A, marking X16 GF500: http://m.littelfuse.com/~/media/electronics/product_specifications/resettable_ptcs/littelfuse_ptc_rgef500_product_specification.pdf.pdf http://m.littelfuse.com/~/media/electronics/datasheets/resettable_ptcs/littelfuse_ptc_rline_catalog_datasheet.pdf.pdf MCZ series, Rubycon, low ESR, high ripple current, 105 degC, aluminium electrolytic (10V, 1000uF): http://www1.futureelectronics.com/doc/RUBYCON/6.3MCZ820M8X11.5.pdf ZLH series, Rubycon, low impedance, 105 degC, aluminium electrolytic (25V, 680uF): http://www.rubycon.co.jp/en/catalog/e_pdfs/aluminum/e_zlh.pdf
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Author: | fzabkar [ May 14th, 2018, 16:28 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
Here are my guesses as to the identities and functions of the ICs on the logic PCB:
U2/U13 = CY7C68013A U3 = XR22404 U4 = 8-bit microcontroller ? U5 = ? U6 = ? U7/U8 = LDO regulator or load switch ? U9 = transceiver ? U10 = FT232R U11 = 88SA8040 / 88SA8052 U14 = 3.3V LDO regulator X2 = 12MHz X6 = 25MHz CY7C68013A, Cypress, EZ-USB FX2LP USB 2.0 Microcontroller, 3.3V, 100-pin TQFP: http://www.cypress.com/file/138911/download XR22404, Exar, USB 2.0 4-port hub, 5V or 3.3V, 12MHz: https://www.exar.com/ds/xr22404.pdf FT232R, FTDI, USB 2.0 UART, SSOP-28: http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT232R.pdf 88SA8040 / 88SA8052, Marvell, IDE-SATA bridge: http://www.psdevwiki.com/ps3/images/a/a7/Marvell_88SA8040-TBC1-pinout.jpg http://www.psdevwiki.com/ps3/images/b/b6/Marvell_88SA8052-pinout.png http://www.psdevwiki.com/ps3/images/5/54/Marvell_88SA8040-TBC1.jpg |
Author: | mad4hdd [ May 14th, 2018, 19:01 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
It would be difficult to measure the test points when the unit is assembled. However, the power board can be tested on its own if a jumper wire is added between the +5V supply and the SATA on/off control pin. Its good idea ..... . he can also add a resistor (limiter) +5 to Gate. |
Author: | fzabkar [ May 14th, 2018, 20:11 ] |
Post subject: | Re: DFL-FRP PCB REPAIRING |
mad4hdd wrote: Its good idea ..... . he can also add a resistor (limiter) +5 to Gate. The logic board drives the power board directly, without limiting resistors. ISTM that R5 and R7 are sufficiently large so as to limit the base current into Q3 and Q6. |
Author: | Abdul Rauf [ May 15th, 2018, 2:50 ] | ||
Post subject: | Re: DFL-FRP PCB REPAIRING | ||
I also can't see the markings on the N-ch MOSFET (Q1). Can you tell us what they are?
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