TCL 25 185 ch. M113
Composition: TCL A20V07-TO (8857CRNG5DU1), 24C08WP, STV8172.
The top of the screen tilted white stripes. S305 - 0.22 microfarad was - 350pf. After replacing all OK.
Composition: TCL-A20V07-TO (8857CRNG5DU1), 24C08WP, NJW1136L, TCL79107D5B3, TDA8172, D1556, TDA8944.
Do not turn on. Crushed line transistor D1556. Replaced, incl .- silence, the LED
is lit. Unsolder pins 5 and 6 24C08WP - TV switched on. I thought, how to find the bytes in 24C08WP, which blocks the processor ON TV. Solved
this problem by using WinHex prog programmer and IC-prog, using the
method of comparison and exception dumps in the two firmwares. Bytes, which will lock TV can be found at: 0010hE (57).
Operating value 37, at 57 - 80 TV does not turn on, or 50 HZ BLOCK. Option in the service menu «OPT». Working firmware and a fragment of a dump is attached. I hope maybe this will help to someone infa. 2560_rab.rar TCL 521 Bytes
Downloaded: 82 time (s)[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
////////////////TCL 2165 chassis M28B
was summoned to the diagnosis, the fuse is lit. Total power
supply spacing: broken key 2SC5586, 2SA1015 a cliff and 2SC1959, C810
and C812 with inflated ESR, swollen by C827 + B. As
a consequence, punched and HR HOT 2SD1555 m / s STV9302A, a protective
resistor R403 breakage in the chain + B and R405 in the chain of +24 V. After
an unsuccessful closing the lid client nadlomana part of the PCB, after
the restoration of track performance TV is completely restored.
//////////////////TCL DT-21368SG M28B chassis
power supply is made on the transistors.
burnt transistors in the power supply: Q804-2sc5287, Qq802-2sa1015 and zener D809 9,1 V. Changed the capacitors s801 c812 100,0 mF and 33 mF. Other details are integers.
The power supply to work, but with a strange light "cricket" sound. The voltage on the secondary circuit of 112V, inflated to 127V.Po image slowly moving along the vertical fracture. If you try to reduce tension regulator VR801 "cricket" is reinforced. The oscillogram sits leveling.
just in case I decided to change the
Q803 2sc1959 who called as a completely intact on all transitions. The power supply as it should be earned.