2018-08-27

Radeon 4850 (Asus EAH4850/HTDI/512M/A)




 FCO-716A generator, 100MHz - apparently one and only on the board
8x Qimonda HYB18H512321BF-10
16M x 32bit (512Mbit) GDDR3, up to 1000MHz

 RJK0353 MOSFETs from Renesas: 30V, 35A, 5.2mOhm, 4.5V gate drive

 TPC8107 - Toshiba MOSFET,
 uP6101B - synchronous-rectified buck controller specifically designed to operate from 5V or 12 supply voltage and to deliver high quality output voltage as low as 0.6V (uP6101A) or 0.8V (uP6101B/C)
Operating at 300kHz.



 LCX74: dual D-type flip-flop with Asynchronous Clear and Set inputs and complementary (Q, Q) outputs
 P3055LDG - N-Channel Logic Level Enhancement Mode Field Effect Transistor, 30V, 50mOhm, 12A
 AZ7805D - 1.0A 5V regulator
 SN74AHCT125DGVR
 uP7706 - 3A ultra low dropout linear regulator, 200mV @ 2A dropout voltage, 1.2...5.5V input, regulated output down to 0.8V.
Pm25LV512 - 512kbit serial Flash.

Card was not working correctly. Artifacts were visible right from the BIOS screen and Windows was crashing in the first few minutes. I've removed cooler, cleaned up thermal paste (large amount of cheap silicone), put some flux around main chip and all memory chips and heat it up with hot air. I'm not sure how long this would last, but it fixed the card at least for now.

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