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T701 maintenances manual
Overview: T701 is TFT LCD color TV , with high brightness, high contrastness ,
clear picture effect . It supports 8 languages OSD menu, humanized menu interface
more convenient for customer to operate.
T701 adopts the stable solution from SANYON with stable in electric circuit. The
main chip is LA76818 LC863232B 53K7CPU ,in which the former completes the
simple signal processing of the whole television, the latter carries out various control
functions. LA7642 is the SECAM decoding chip, 24C08 is the EEPROM memory,
4053 is an electronical switch using to choose input signal; It also use two pieces of
logic-door electric circuit in 4001, uses to produce composite synchronizing signal and
the pulse signal respectively.
We need to get familiar with the principles of each part of unit electric circuit
while maintaining this machine concretely. Then reduce the scope of trouble gradually,
after the actual phenomenon being examined by instrument tools. Finally find out
faulty components, and use another new one to take place of the bad in order to repair
the television. There are various of reasons leading to fault. We should use flexible
ways while maintaining the TV, to achieve accurate judging and fast repairing.
The following are the overhauling flow charts of common breakdowns, which can be
used for reference in the service. But we should pay more attention to analyze the actual
electric circuit while overhauling, without being blind constantly.
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