HITACHI 42HDT52A
Set dead. do not turn ON.
Checked the poser supply. Found OK.
Checked the main board. [JA05958] found defective. Changed the IC I 106 solved the problem.
HITACHI 55HDT52
Set turns ON, but there was no picture. Checked all the voltages comes out from the SMPS. Found almost OK, but not so accurate as schematic indicates. Repalced [50N50] MOSFET. Checked OK.
HITACHI P50T501
Set turns ON but it goes OFF within 3 seconds. No audio, No video. Protection circuit detects some power supply short.
Replaced IC 3294F on ND60200-0057; Tested OK.
HITACHI 55HDT52
Turns ON and shuts down. On further checking, found a blown IC M801 on buffer board. Replaced the same [SN755866] solved the problem. The IC was available. In most cases the buffer board [ND 60200-0033] might need replacement as card basis.
