Thursday, June 15, 2017

How to enter the SERVICE mode China TV kit using TDA9374 System-Chroma jungle – PF2939 chassis - Circuit diagram

Used semiconductors and transformers
STR-F6454R (SMPS control), TDA9384, TDA8360Q, TDA9859, TDA7057AQ, TA75558P, TDA7056B, TDA6107Q, HEF4053BP, AT24C08(Memory), TDQ-5B6M(Tuner), BSC68Z (FBT) 
How to enter the service mode
Set the volume to 0 by the remote control. Then press and hold the MUTE button on the remote control and MENU button on the TV at the same time for over 2 seconds. In the S mode, press the POWER button to quit the S mode.
Use the Dn/Upbuttons on the remote control to highlight an adjustment and the L/R buttons
to adjust it.
The POS +/-,UP/DN,L/R, 1~6, RECALL, VOL+/-, MUTE and POWER buttons on the remote control function in the S mode, but 100+, 7, 8, 9 and 0 buttons not.
Schematic
Click on the schematics to magnify