D-Link DGS-1024D rev A2

"24 Port 10/100/1000 Ethernet Switch" and "REV-A2" is silkscreened on the board.
 * It's presumably an Alpha Networks manuf'ed switch.


 * D-Link DGS-1024D on badcaps.net forums
 * Broadcom (Altima ?) based
 * Broadcom BCM5345M (BCM5464 ?) - 24-ports Switch w/o int. PHY
 * 6x Broadcom BCM5014R - Quad Gigabit Ethernet 1000BASE-T PHY

PSUs

 * Power supply marked as being a YCL NAD-116 (YCL PCB452-B)
 * 100~275V AC input (50/60Hz, 1.5-0.8A) -> 12V DC, 3.3A

<!-- Later models of DGS-1016D and DGS-1024D have a lifetime warranty. One cap takes these switches down. Power supply C12 is the tiny cap next to the big input cap. You can't see it with the cap in but when you get it out you'll see heat damage which is why it goes bad. You can replace any other cap you like but that's the only cap I've ever seen go bad.

Here's the work I did on the DGS-1024D which should have the same power supply.

HW Ver A2

Power Supply: NAD-116 12V 3.3A - YCL PCB452-B
 * Q1: Fairchild FQPF7N80C 800V N-Channel MOSFET
 * IC1: Fairchild KA3882 SMPS CONTROLLER (KA3882CDTF)
 * IC?: Lite-On LTV-817 LTV-817C LTV-817-C Optoisolator
 * (test with bench supply, compatible with Fairchild FOD817C)


 * ZD1: more than 15.7v
 * D3: OnSemi B20100G Dual Rectifier
 * D3: E220A Dual Rectifier
 * U3: UTC TL431 Shunt Regulator


 * C?: Nichicon PT 100uf 450v
 * C11, C3: Ltec LZG 680uf 25v WV=12v ESR=0.04
 * C4: Ltec LZG 470uf 25v WV=12v ESR=0.06
 * C12: Ltec TK 47uf 50v WV=11.3v ESR>20
 * R7: Resistor 18K measures 9K with IC1 in place

Unit does not power up. Fans will spin if push started. Power supply outputs 3v under load and 7v with load removed. C11, C3, C4 test good. I swap U3 with no change. C12 tests with excessive ESR. Then I notice the heat damage from C? to C12. Replacing C12 brings the output voltage up to 12v and restores operation. After a few minutes most of the port LEDs flash randomly.

Main board: REV-A2

U1: 24LC64 EEPROM U4: Philips 74AHC14D Hex inverting Schmitt trigger U8: Fairchild FDS6986S Dual N-Channel MOSFET U9: TI 74LC245A OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS U10: Pericom PI3VT3306 2-Bit, 2-Port, Low Voltage
 * Translator Bus Switch (incorrectly labeled P13VT3306L)

U11, U14: TI 74AHC04 Hex inverter U13: Fairchild FDS7764A 30V N-Channel MOSFET U15: Fairchild FDS6694 30V N-Channel MOSFET U16: Fairchild FDS6986S Dual N-Channel MOSFET U24: Fairchild FDS6986S Dual N-Channel MOSFET (labeled FDS6990A)

U17, U18, U19, U20, U22, U23: Labeled: Broadcom BCM5014R - Quad Gigabit Ethernet 1000BASE-T PHY U7: Labeled: Broadcom BCM5464 - Quad Gigabit Ethernet 1000BASE-T PHY (seems incorrectly labeled as it appears to be a 24 port switch without integrated Phy. Each set of 4 goes to a BCM5014R. More likely to be a BCM5345M.)

U26, U27: Lattice ispLSI 2064VE PLD Programmable Logic Device U28: Delta RJG-8FAP 4x2 8 port Ethernet jack with integrated 1000BASE-T Ethernet Transformers T1, T2, T3, T4: Bothhand G4P209 Quad Port 1000BASE-T Ethernet Transformer

Fans: T&T 4010M12F ND8 12v 0.16A 40x10x10 mm 2 wire D1, D2, D3, D4, D5: B340B SMD DIODE SCHOTTKY 40V 3A


 * Richtek RT9206 High Efficiency, Synchronous Buck with Dual Linear Controllers

U5, +U8 - C15,C19:12v -> C22,C25:3.3v U12, +U13 +U15 - C57,C58:12v -> C38,C39,C48,C49:1.25v U21, +U16 - C67,C68:12v -> C77,C78:2.5v U25, +U24 - C126,C128:12v -> C137,C158:1.8v

C4, C37, C160 WV=3.3v C9, C36 WV=1.25v C10, C16, C132 WV=2.5v C15, C19, C57, C58, C126, C128: TOBR 470uf 25v WV=12v Δ C22, C25: Taicon PW 1000uf 10v WV=3.3v C24, C127: TBOR 47uf 25v WV=12v C32, ROM-C5: Teapo SS 47uf 16v WV=3.3v Δ C38, C39, C48, C49 WV=1.25v C42, C44: GSC RE 1000uf 25v WV=12v Δ C47 WV=1.25v C67, C68: Teapo SC 470uf 16v WV=12v C77, C78, C79 WV=2.5v C80, C124: GSC 100uf 16v WV=1.25v C131: TBOR 100uf 25v WV=1.8v C133, WV=12v C137, C158, WV=1.8v --- Δ C42, C44, C57, C58: -> Rubycon MBZ 1500uf 16v Δ -->