[TechAssist] PTV Unusaul Coolant Leak - Fixed
- From: Bil Green <tv.vcrrepair@xxxxxxxxxxx>
- To: ".TECHASSIST @ freelists . org" <techassist@xxxxxxxxxxxxx>
- Date: Wed, 16 Jun 2004 15:44:31 -0700
Toshiba PTV
Model 65HX81
Symptom: no power
Just finished repairing this set. It was so hard to figure where the
leak was that I thought this may help someone else (other interesting
defects found)
1. Troubleshot
2. Located and replaced open 2A circuit protector in power supply -
at this time a portion of the green CRT (picture tube) circuit
board immediately started burning up
3. Examined area around green CRT and found a few drops of liquid
leaking from the CRT onto the circuit board (cause of burning).
4. Removed the green CRT/assembly - checked carefully for leaks (no
longer leaking! - so obvious sign as to where it leaked from)
5. After hours of waiting for it to leak, and more tests, a loose
filler plug was found (buried under silicone sealant). We added
more coolant, tightened it (was not leaking at this time), and
sealed it with silicone sealant.
6. Repaired burnt wiring on green CRT board
7. Reinstalled green CRT/assembly
8. Adjusted convergence controls
9. Tightened loose lens wing nuts (not done properly at factory)
10. Cemented totally loose convergence adjustment tabs (another
big mistake at factory)
DOES TOSHIBA SUCK OR WHAT? - This is not the first time I am seen
loose lens wing nuts, not to mention almost every direct view Toshiba
I see having very green grey scale. But then it is good for business.
--
Best regards,
Bil Green
PC 1000
Mammoth Lakes, CA 93546
760-924-1000 mailto:tv.vcrrepair@xxxxxxxxxxx
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