Electronic and TV repair tips
Hitachi TV Model: C2133TN (Nokia Stereo Plus) Chassis)
Very strong red content in the picture,
sometimes the fault would clear with the strong red content fading until the
correct greyscale was achieved
After much searching around i found the problem. There was a very small crack in the solder at RH23, this is a 2K4 surface mounted resistor located at the back of the tube base. Resoldering both sides of it cured the fault
After much searching around i found the problem. There was a very small crack in the solder at RH23, this is a 2K4 surface mounted resistor located at the back of the tube base. Resoldering both sides of it cured the fault
(Sparky)
Jvc TV Model: C-V14EKS/B/W (Onwa Chassis)
No Red
I was hoping the nvm had become corrupt and turned the red drive down but it was fine (To enter service mode press and hold vol up and vol down on the front panel and switch set on). Thankfully ZD405 (8V2) had expired (almost s/c) and removed the red
I was hoping the nvm had become corrupt and turned the red drive down but it was fine (To enter service mode press and hold vol up and vol down on the front panel and switch set on). Thankfully ZD405 (8V2) had expired (almost s/c) and removed the red
(Andy Doswell)
Sanyo Video Model: VHR776E
Dead
Check and replace PR512 (which is located towards the front right hand side)
Check and replace PR512 (which is located towards the front right hand side)
(T.t.r.s. - Tim)
Nikkai TV Model: BABY 10
No / int luminance
Poor contacts within the service switch
Poor contacts within the service switch
(John)
Sony TV (AE1 Chassis)
Field non linearity and short picture
Check / replace C531 (680uF, 25v), only slightly leaky, but a new one cured the fault
Check / replace C531 (680uF, 25v), only slightly leaky, but a new one cured the fault
(Anonymous)
Philips Video Model: VR200
Unit not working, no FL display, ticking
from PSU, head drum twitching
Electrolytic cap in PSU primary dried up (47uF, 50v)
Electrolytic cap in PSU primary dried up (47uF, 50v)
(Anonymous)
Ideal/Slx TV Model: IDTV28T/IDTV28N/SLX28T2/28N (SM2 Chassis)
EW fault then set went dead (tripping),
R711 on EW panel burnt
Check for dry joints on C620 (0.47uF, 250V), if dry replace then check Q602 and R618 (5K6). Also it is worth replacing Q580 anytime these sets come into the workshop with a BF422
Check for dry joints on C620 (0.47uF, 250V), if dry replace then check Q602 and R618 (5K6). Also it is worth replacing Q580 anytime these sets come into the workshop with a BF422
(Leonard O'Brien)
Philips TV Model: 25PT4423 (L6.2 Chassis)
Stuck in standby, LED on, no HT
There may be no 5V to the microprocessor. Check R3509 and D6501. Replace R3509 with a 47k 1 Watt version (4822 053 10473). D6501 is type BZX79B5V6 (4822 130 34173). Check the +150 volt rail, 145V is too low
There may be no 5V to the microprocessor. Check R3509 and D6501. Replace R3509 with a 47k 1 Watt version (4822 053 10473). D6501 is type BZX79B5V6 (4822 130 34173). Check the +150 volt rail, 145V is too low
(Adel Ibrahim)
Rca TV Model: F27442 (CTC203AD5 Chassis)
No picture and sound, only a high pitch
sound at switch on
Remove horizontal transistor and measure the resistance across any two pins. This value should be no less than 200ohms
Remove horizontal transistor and measure the resistance across any two pins. This value should be no less than 200ohms
(Roughtest)
Sony TV Model: KV-M2131U (BE1 Chassis)
Intermittent loss of syncronisation, both
horizontal and vertical
The surface mounted power transistor on the teletext module requires resoldering. As there is evidence of scorching on the board the use of a more substantial component would be indicated perhaps with small heatsink
The surface mounted power transistor on the teletext module requires resoldering. As there is evidence of scorching on the board the use of a more substantial component would be indicated perhaps with small heatsink
(Desmond Armstrong)
Samsung TV Model: CZ-21D83NS
Double picture or raster shifted
Check R414 (15K)
Check R414 (15K)
(Leonard)
Sony TV Model: KV2565
Dead with H. output short circuit,
replacment blows short again
First check power area and repair dry joints then change all high voltage (PF value) capacitors in the horizontal section, this fixed the problem
First check power area and repair dry joints then change all high voltage (PF value) capacitors in the horizontal section, this fixed the problem
(Imran Khan)
Mitsubishi TV Model: CT29B2STX
Various faults, dead, int. dead, poor
frame, poor E-W
Change all electrolytic capacitors in the primary. Check all large electrolytics in the secondary (Ie bigger that 470uF), check all capacitors around IC950 (error amp.). Most capacitors you will find are leaking electrolyte. Might be a long job!!!
Change all electrolytic capacitors in the primary. Check all large electrolytics in the secondary (Ie bigger that 470uF), check all capacitors around IC950 (error amp.). Most capacitors you will find are leaking electrolyte. Might be a long job!!!
(Andy Doswell)
Sony Video Model: SLV-E800
No picture - screen is empty. Sound is ok
Check IC101 (BA7630F), if video signal comes to input (pin 1) but not present at output (pin 14) then replace this IC
Check IC101 (BA7630F), if video signal comes to input (pin 1) but not present at output (pin 14) then replace this IC
(Raymundo)
Panasonic Video Model: NVHD650B
Fault code F80. works occassionally then
doesnt work at all
There is a plastic piece on the motor which rotates when you press play or eject. A plastic cap fits on the spindle of the motor. This slips and doesnt grip the motor hence does not turn the drive gears. Just glue or replace the part (use loctite or super glue)
There is a plastic piece on the motor which rotates when you press play or eject. A plastic cap fits on the spindle of the motor. This slips and doesnt grip the motor hence does not turn the drive gears. Just glue or replace the part (use loctite or super glue)
(Dal)
Philips TV (A10 Chassis)
Procedure to view customer service menu
Press Mute button on handset and any button on the TV, hold for a few seconds and menu will appear
Press Mute button on handset and any button on the TV, hold for a few seconds and menu will appear
(Joe)
Ferguson Video Model: FV105HV
Vcr dead, slow oscillation in p.s.u
Replace CP007 and CP008 close to the U4614B (Found this tip posted under Thomson VPH6601 which seems to have the same PSU)
Replace CP007 and CP008 close to the U4614B (Found this tip posted under Thomson VPH6601 which seems to have the same PSU)
(Anonymous)
Philips TV Model: 32PW6526-05 (SA10E Chassis)
Procedure to exit child lock with pin
unknown / "locked" displayed on screen
Switch set on, press menu, select feature and press enter, select parental lock and press enter, then enter the code 0, 7, 1, 1 twice, the lock should now have cleared
Switch set on, press menu, select feature and press enter, select parental lock and press enter, then enter the code 0, 7, 1, 1 twice, the lock should now have cleared
(Josh)
Fermendi TV (F19 Chassis)
Procedure to invoke service mode
I have used this method and it works (supplied from the makers manual). With tv off, hold volume up button on tv, switch tv on and keep holding volume up button whilst pressing standby on remote (this must be done within 4 secs of switch on) at no time let volume go, press the yellow memory button on the handset to store
I have used this method and it works (supplied from the makers manual). With tv off, hold volume up button on tv, switch tv on and keep holding volume up button whilst pressing standby on remote (this must be done within 4 secs of switch on) at no time let volume go, press the yellow memory button on the handset to store
(Steve Taylor)
Toshiba TV Model: 28W23B (11AK37 Chassis)
Procedure to enter the service mode
Press the menu button then 4,7,2,5
Press the menu button then 4,7,2,5
(Josh)
Toshiba TV Model: 28W23B (11AK37 Chassis)
Picture displaced vertically, picture too
high or low
This problem was cured by entering the service mode (menu then 4,7,2,5), then pressing the green fastext button to access geometry settings, selecting VP1 (vertical position) and adjusting as necessary
This problem was cured by entering the service mode (menu then 4,7,2,5), then pressing the green fastext button to access geometry settings, selecting VP1 (vertical position) and adjusting as necessary
(Josh)
Sony TV (BE3D Chassis)
Procedure to enter the service mode
Press standby, i, 5, vol+ and tv (TT should now be displayed on the screen indicating the set is in the service mode)
Press standby, i, 5, vol+ and tv (TT should now be displayed on the screen indicating the set is in the service mode)
(Josh)
Grundig TV (CUC7301/3 Chassis)
Power supply blown
This is often caused by a dry joint at C669 in the snubber network but also check the mains bridge rectifiers reservoir capacitor (47uF, 385v) for o/c, this item is not included in the ususal p.s.u repair kits and if not checked may result in a repeat blow up !
This is often caused by a dry joint at C669 in the snubber network but also check the mains bridge rectifiers reservoir capacitor (47uF, 385v) for o/c, this item is not included in the ususal p.s.u repair kits and if not checked may result in a repeat blow up !
(Josh)
Sony TV Model: KV32TS20
Dead no click, Q502, Q601, Q602 shorted and
blown fuse 602
Change all the above parts and also check R647, C512, C525, D607, D608, D609, D610, D622, VDR601 off primary side of T605. I`ve also found T605 bad too. ToughDog, Sony has bulletin out on this model
Change all the above parts and also check R647, C512, C525, D607, D608, D609, D610, D622, VDR601 off primary side of T605. I`ve also found T605 bad too. ToughDog, Sony has bulletin out on this model
(Dwayne)
Sony TV Model: KV32TS20
Dead, good tip that I always use to save
changed parts after replacing Q502, Q601, Q602 and blown fuse 602
I hook up 100 watt light bulb across fuse conection, then turn on tv, if light is very bright you still have a short. You saved the parts you changed, light should be dim and or blinks
I hook up 100 watt light bulb across fuse conection, then turn on tv, if light is very bright you still have a short. You saved the parts you changed, light should be dim and or blinks
(Dwayne)
Sony TV Model: KV27TS20
Intermittent video or snow
Resolder points A, B, C, D in tuner PCB, check cold solder on tuner shield 2-106-349-21
Resolder points A, B, C, D in tuner PCB, check cold solder on tuner shield 2-106-349-21
(Dwayne)
Ferguson Video Model: FV70B
Dim display
Check capacitor CP41 (220uF, 10v)
Check capacitor CP41 (220uF, 10v)
(Tom)
Panasonic Video Model: NV-L20
Poor playback and recording (looks like
poor heads). Also shows as interference when playback appears
Check all electrolytics in secondary of switch mode power supply
Check all electrolytics in secondary of switch mode power supply
(Ray)
Hitachi Video Model: VTM640
Low video level
Replace C1530 (47uF, 16v)
Replace C1530 (47uF, 16v)
(Mt)
Jvc Video Model: HRJ235EK
Rubbing noise at start of full tape with
horizontal picture judder
Excessive take up tension! Replace take up clutch item 25, Pt no PQ46323A-1
Excessive take up tension! Replace take up clutch item 25, Pt no PQ46323A-1
(E.T. Sandy)
Vestel TV (11AK19 Chassis)
Dead, ticks from switch on
Lop transistor dead short (BU2508AF) also check cap (12nf)
Lop transistor dead short (BU2508AF) also check cap (12nf)
(Jonny)
Bush TV Model: WS6671 (11AK19 Chassis)
Very low width and bowed verticals,no ew
correction. R626 o/c
C630 (390nF, 300v) faulty, located next to scan socket. This fault can also be caused by R629 (2R7 fusable) o/c. In my set C630 was dry-jointed but not faulty. Check generally for dry joints in the E/W and PSU areas. Note that R629 is a safety component
C630 (390nF, 300v) faulty, located next to scan socket. This fault can also be caused by R629 (2R7 fusable) o/c. In my set C630 was dry-jointed but not faulty. Check generally for dry joints in the E/W and PSU areas. Note that R629 is a safety component
(Ian - Brighton)
Ferguson TV Model: TX98 (TX98 Chassis)
Intermittent tripping and switching to
channel 1
Replace IC11 (TDA8138) 5/12 volt regulator ic
Replace IC11 (TDA8138) 5/12 volt regulator ic
(Steve - Comet service)
Metz TV (11AK20 Chassis)
Switches to standby when hot
Check 4.00Mhz Xtal
Check 4.00Mhz Xtal
(Wayne Haverson)
Sony TV Model: KV-M1400D (BE2A Chassis)
Retrace lines on picture, 60V on RGB
transistors
C700 (100nF, 250V) seems to be leaky, but main problem is R723 which had gone from 27R to 1.2M, both on CRT board
C700 (100nF, 250V) seems to be leaky, but main problem is R723 which had gone from 27R to 1.2M, both on CRT board
(Anonymous)
Sony TV Model: KV-M1400D (BE-2A Chassis)
Dead, after replacing ic601 (STR54041) and
Q601 (BC637) standby led blinks red twice, then blank, no HV
Replace fuse p801 (ICPN15 - 0.6A 50V, TO92)
Replace fuse p801 (ICPN15 - 0.6A 50V, TO92)
(Anonymous)
Amstrad Video Model: DD8900
Bottom deck fails to load tape when
pressing play/record. Sounds like loading motor is labouring when the pinch
roller engages capstan shaft
The loading may complete if black pulley wheel on motor drive is 'helped'. Look for stiff linkages before suspecting Motor
The loading may complete if black pulley wheel on motor drive is 'helped'. Look for stiff linkages before suspecting Motor
(Anonymous)
Tatung TV (F Series Chassis)
Starts up with black raster, then shuts
down with LED blinking 4 times
This is the micro telling you that the auto grey-scaling procedure has failed. Change resistors R909, R913 & R922 (180k, 1%) on crt base PCB. You will probably find that all these have gone high
This is the micro telling you that the auto grey-scaling procedure has failed. Change resistors R909, R913 & R922 (180k, 1%) on crt base PCB. You will probably find that all these have gone high
(Rob Hancock)
Matsui TV Model: 1408T
Locked out by incorrect pin number being
used - and Dixon's want £25 to do this!
1: Press standby on remote control to switch TV on
1: Press standby on remote control to switch TV on
2: Press volume minus button on set front, while pressing 7 on remote control
for at least two seconds, until 'OK' appears in the middle of the screen
Thanks to my son who has no TV training at all!!
(James)
Panasonic TV Model: TX28W3 (EURO 1 Chassis)
No raster, only heard a pip from speakers
that went after a few seconds
C623 and R628 changed
C623 and R628 changed
(Nima)
Grundig TV Model: ST70-460 (CUC4635 Chassis)
Intermittent start up and tripping
Dry joint on R636, vertically mounted 4.7 ohm wirewound in sw mode circuit
(Peter Nutkins)
Nei TV Model: 2031TX
No Power
R802 open circuit. Unknown device (poss. Thermistor). Replaced with 15K, 2Watt
(Anonymous)
Sony TV Model: KV-2565MT (SCC-E64P Chassis)
Horizontal output transistor Q802 goes short
repeatedly
C818 (1uF, 250v) had lost capacity, replaced C818 and Q802 and unit was ok
(Fiesta Service)
Sony TV Model: KVD-C21MF1 (SCC-K68A-A Chassis)
No sound and screen not appearing, B+ ok
No input on pin 5 of IC301 (MC44002P), R339 had failed, once replaced the unit
was ok
(Fiesta Service)
Bush TV Model: 28ZKF
Set powers up but no sound and blank raster
RF10 o/c (33 ohm)
(Rod)
Panasonic TV Model: CT20G12V
Dead
This was found to be due to the STR58041 chip
(Anonymous)
Philips TV Model: GR2.4AA (GR2.4AA Chassis)
No picture, just black screen
Check R3414, an SMD chip on the CRT board. There could be invisible bad solder
joints
(Kalle Birgersson - Sweden)
Panasonic Video Model: NVJ40
Poor picture, may clear as unit warms up
Check C27 in the power supply secondary
(Anonymous)
Philips TV Model: TX2112 (U5N Chassis)
Sound mutes for too long when changing stations
(up to 30 secs)
The MAB8441-T005 was faulty (no longer available)
(Anonymous)
Thorn Video Model: VR414LVA
Dead, no functions, no display
Replacing CP19 (1000uF, 10v) in the PSU restored operation
(Col)
Goldstar Video Model: P13I
Dead, no functions, no display
Labels: Repair Tips
posted by Admin1 @ 2:07 AM
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