Text preview for : service_tips_chassis_3a_3d_196.pdf part of . Various service tips chassis 3a 3d 196 . Various Div problemen en oplossingen service_tips_chassis_3a_3d_196.pdf
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No function, after being switched onFault 1: The last position has been stored after switch off. Faults that can
occur: The appliance has been switched off with the remote control and afterwards the mains plug has been
pulled out of the socket. Now the TV can only be switched on with the remote control (or it goes to standby).
the appliance goes to stand-by.
No function, the power supply gurgles and whistles.
Fault 1 The audio module has a short, therefore the power supply is intermittent.
No function.
Fault 1: Capacitor 2609 (8200pF/1500V) is defective.
Fault 2: Power supply goes to protection mode. Check if power supply or loading is defective. Replace
loading with a 220V (100W) lamp. If power supply ok then change C2609.
Fault 3: Check if service no. starts with AG01. Appliance is set to protective mode. Check fuse T1638.
Fault 4: Check if 300V present. If no 140V then check R3681 (6K8).
Fault 5: + 140V is not present. Replace TS7687 (BUT12A; 4822 130 43919).
Also replace TS7674 (BC337; 4822 130 40855), TS7685 (BC547; 4822 130 44257), TS7686 (BC369; 5322
130 44593). Standby LED and Crispening LED both flash.
Fault 6: Capacitor 2612 (360nF/250V) S/C. Fault 7: Line BU is defective.
Fault 8: Check circuits 7200 and 7210 (TDA1514) if R3200 and R3201 on audio module are warm.
Note: With the old 3A chassis line time base does not start if sound module has been removed. With some
models video switches off if sound module has been removed.
Fault 9 : Replace IC (TDA1514) on audio module.
Occasionally does not start up. Fault 1 Replace diodes 6616, 6677 and 6672.
When the appliance is set to stand-by after playing for about 3 hours, it switches on and off continuously and
the red and green LED's also.
Fault 1 Check T7731, T7743 and T7742.
The appliance automatically switches to EXT2.
Fault 1: C2835 (4.7nF) is defective. The capacitor is positioned on the front operation board in the TV.
The appliance is in safety mode.
Fault 1: C2610 (180nf) has a short circuit, amplifier TDA1514.
At start up the appliance goes into safety mode.
Fault 1: D2609 has a short circuit (8.2nf) and D6609 is leaky.
No sound. No picture. Blocked commands. May be intermittent.
Fault 1: Check the power supply of the IC and F1642.
The TV works intermittently.
Fault 1: Resolder connector P05 on the display board/control board (module 1008).
Poor locking in audio search.
Fault 1: Remove module 1012. Change IC7038.
Spontaneous operation (after a few weeks) in the wrong option mode (white picture, no teletext, no VHS).
Fault 1: Replace zener diodes 6933 and 6934 on the SSP module.
Appliance sometimes does not start, often only starts the second time around. Everything is fine from stand-
by.
Fault 1: Check resistors R3658 and 3659.
After operating normally for a short time the TV goes from "Reception" to "Search".
Fault 1: Check the IF module.
Starts up after minimum 30 secs of the CRT lighting up.
Fault 1: Check C2638 (10mf) that filters the 200V coming from the FBT. If ok, tube is defective. Short circuit
coil 5465 or 5466.
The appliance does not start up. On the variac increases to 100V and as soon as the EHT starts up it fails. No
apparent s/c.
Fault 1: If the power supply is in safety mode replace the load by a 100W lamp and check 1609/8200pf and
1612/360uf. If there is no 140V, check R3681 (6.8k), if ok with 100w lamp, no s/c, check C2618, C2609,
C2610, D6609 and D6610. If by removing the load, the appliance still does not function, the line transformer
is defective.
Shows a sort of stabilization of AFC a number of times a day. Some channels worse than others.
Fault 1: [Replaced tuner]. Channels with offset may readjust occasionally. Replace