Symptom: Set dead. Cause: Damage to IC800 has occured due to spurious mains spikes. Cure: Change the defective IC800 MC44608P (part number 30011968) and in order to improve IC800 resistance to spikes change R801 from RES CF 1/4W 1K J to RES CF 1/4W 4.7K J .
As a preventative measure this resistor should be changed even if IC800 has not failed Spare Parts Required: R801: ¼ w 4.7k
IC801: MC44608 Part Number V30011968
Replace R801 1K with 4.7k
R801
This change has been applied to all production.
Service Bulletin Model:
All models Chassis.
SUBJECT :
with
AK37
Service Bulletin No: 122
Priority ( )S. All product. ( )A. Items in Customer / Dealer stock / Service return goods. ( )B. Customer stock / Units returned for Service. ( X)C. Sold items returned for Service. ( )D. Only Units returned to this bulletin. ( )E. Others
IC 800 defect
DATE : August 07, 2002
Please modify if following symptom occurs
TV does not work due to IC800 broke down
Spikes on main power affects and disturbs to IC 800.
After changing the defected IC800, In order to improve IC 800 resistant to spikes, modify the chassis as given below. Replace, R801 RES CF 1/4W 1K J
==> RES CF 1/4W 4.7K J
C860 CAP CER 100NF 100V ==>
CAP MKT 47NF 250V J .
R801: VE-30000718 C860: VE-30000107
26.05.2002
Service Bulletin Model:
33’’ and 28’’ 16:9 32’’ 16:9 models with AK37 Chassis.
SUBJECT :
Service Bulletin No: 155
Priority ( )S. All products. ( )A. Items in Customer / Dealer stock / Service return goods. ( )B. Customer stock / Units returned for Service. ( X)C. Sold items returned for Service. ( )D. Only Units returned to this bulletin. ( )E. Others
IMPROVEMENT ON THE RELIABILITY OF 33’’ and 16:9 DATE : APR 17, 2003 models
Please modify if following symptom occurs
Overheat on the D606.
The over current stress on the D606.
Apply that modification: Replace; D606: DIODE BY299 2A/800V 70A è DIODE UF5407 3A/800V 150A
VE- 30007681: DIODE UF5407 3A/800V 150A
18.04.2003
(Related Changing Form: 382)
Service Bulletin Model:
All models with AK37-5, AK37-6 and AK37-7 Chassis.
SUBJECT :
Service Bulletin No: 135
C622 defect
Priority ( )S. All product. ( )A. Items in Customer / Dealer stock / Service return goods. ( )B. Customer stock / Units returned for Service. ( X )C. Sold items returned for Service. ( )D. Only Units returned to this bulletin. ( )E. Others
DATE : July 18, 2002
Please modify if following symptom occurs
TV does not work due to C622 short circuit.
EW transistor driving condition during start-up.
After changing the defected C622, In order to improve EW transistor driving during start-up, modify the chassis according to CRT size as given below. Remove R689 and R697: For 28’’ 16:9, 32’’ 16:9 models and 29’’ RF, 32’’ RF models, 29’’ 4:3 and 33’’ 4:3 models: Insert: R689 : ----- è RES MO 1W 5.1K J R697: ----- è RES CF 1/4W 270R J For 28’’ 4:3 and 25’’ 4:3 models: Insert: R689 : ----- è RES CF 1/4W 4.7K J R697: -----è RES CF 1/4W 470R J
For 28’’ 16:9, 32’’ 16:9 models and 29’’ RF, 32’’ RF models, 29’’ 4:3 and 33’’ 4:3 models: R689: VE-30001177 RES MO 1W 5.1K J R697: VE-30000622 RES CF 1/4W 270R J For 28’’ 4:3 and 25’’ 4:3 models: R689: VE-30000718 RES CF 1/4W 4.7K J R697: VE-30000712 RES CF 1/4W 470R J
18.07.2002
Service Bulletin Model:
All models with AK37-5, AK37-6 and AK37-7 Chassis.
SUBJECT :
Service Bulletin No: 131
IC 601 defect
Priority ( )S. All product. ( )A. Items in Customer / Dealer stock / Service return goods. ( )B. Customer stock / Units returned for Service. ( X )C. Sold items returned for Service. ( )D. Only Units returned to this bulletin. ( )E. Others
DATE : July 17, 2002
Please modify if following symptom occurs
TV does not work due to IC601 broke down
Spark on CRT
After changing the defected IC601, In order to improve IC601 resistant to sparks on CRT, modify the chassis as given below. 1. Modifty 11AK37-5, AK37-6 or AK37-7 chassis by insertion Zener diode 5.1V (VE-30007763) between pin 1 of IC601 and ground as explain below. Solder the cathode of Zener diode 5.1V to pin 1 of IC601; solder the anode of Zener diode 5.1V to Ground 2. Insert the second zener diode 5.1V (VE-30007763) between pin 3 of IC601 and ground as explain below. Solder the cathode of Zener diode 5.1V to pin 3 of IC601; solder the anode of Zener diode 5.1V to Ground. 3. Insert the zener diode 12V (VE-30001350) between pin 5 of IC601 and ground as explain below. Solder the cathode of Zener diode 12V to pin 5 of IC601; solder the anode of Zener diode 12V to Ground. 4. Cut the trace between the emitter of Q603 and R606 then insert a RES CF 1/4W 560R between the emitter of Q603 and R606.
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